CN117896036A - Cell searching method and system - Google Patents
Cell searching method and system Download PDFInfo
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- CN117896036A CN117896036A CN202311614671.2A CN202311614671A CN117896036A CN 117896036 A CN117896036 A CN 117896036A CN 202311614671 A CN202311614671 A CN 202311614671A CN 117896036 A CN117896036 A CN 117896036A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000004891 communication Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0086—Search parameters, e.g. search strategy, accumulation length, range of search, thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention provides a cell searching method and a cell searching system, which relate to the technical field of wireless communication, wherein the method comprises the following steps: acquiring an SSB period of a target frequency point; when the SSB period is larger than a preset search time window, determining the search times of the target frequency point according to the SSB period and the preset search time window; determining a target starting position of each search of the target frequency point according to the SSB period and the search times; and carrying out cell searching on the target frequency point according to the current searching times and the corresponding target starting position. The beneficial effects are that: when the SSB period is larger than the preset search time window, the search times of the target frequency point are determined according to the SSB period and the preset search time window, so that the target starting position of each search is determined, cell search on the target frequency point is realized, cell search can be effectively performed even under the condition that the SSB period is longer, a large amount of buffer areas are not needed for storing data, and therefore space waste is avoided, and search efficiency and search precision are improved.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a cell search method and system.
Background
In a wireless communication system, a terminal device needs to perform a cell search after power-on to determine cells that can reside. In the initial cell searching process, the terminal needs to select a proper frequency point from all the candidate frequency points supported by the terminal to complete cell searching and reside. For terminal equipment supporting multiple frequency bands, a long time may be required for frequency sweep and frequency point analysis, so that the cell searching time is too long, and the user experience is directly affected.
In the conventional initial cell search scheme, if the actual synchronization signal/physical broadcast channel block (SSB) period of the cell is not greater than 20ms for a cell where the terminal device is not camped, as shown in fig. 1, the Initial Cell Search (ICS) may use a duration of 20ms+3 symbols (symbols) as a fixed search time window to receive data, so that it may be ensured that a complete SSB BURST is received. However, for SSB periods greater than 20ms, the received data may not contain a complete SSB using a fixed search time window of 20ms+3 symbols, thus risking search failure.
To solve this problem, the current scheme is to extend 20 ms+3 symbol data to SSB period+3 symbol. Although this scheme ensures that a complete SSB is received, due to the memory constraint of the mobile phone, for the case where the SSB period is long, such as 40ms or more, the BUFFER (BUFFER) required to receive data in SSB period+3 symbols is very large, resulting in a waste of space.
Disclosure of Invention
In order to solve the technical problems, the invention provides a cell searching method and a cell searching system.
The technical problems solved by the invention can be realized by adopting the following technical scheme:
a cell search method, comprising:
Acquiring an SSB period of a target frequency point;
When the SSB period is larger than a preset search time window, determining the search times of the target frequency point according to the SSB period and the preset search time window;
Determining a target starting position of each search of the target frequency point according to the SSB period and the search times;
and carrying out cell searching on the target frequency point according to the current searching times and the corresponding target starting position.
Preferably, the method further comprises:
And when the SSB period is not greater than the preset search time window, carrying out cell search on the target frequency point according to the preset search time window.
Preferably, before the SSB period of the target frequency point is acquired, the method includes:
Receiving a candidate frequency point list of a cell;
and taking the first candidate frequency point in the candidate frequency point list as the target frequency point.
Preferably, the number of searches is a ratio of the SSB period to the preset search time window.
Preferably, the number of searches is an upward rounding of the ratio of the SSB period to the preset search time window.
Preferably, the target starting position is calculated using the following formula:
start(i)＝[(i-1)*SW]mod M
wherein i represents the current search times; SW represents the preset search time window; m represents the SSB period of the target frequency point; start (i) represents the target start position corresponding to the current search number.
Preferably, the performing cell search on the target frequency point includes:
Receiving data from the target frequency point according to the target initial position corresponding to the current searching times;
And carrying out initial cell search on the received data.
Preferably, the method further comprises:
and when the current searching times do not search the cell, carrying out cell searching according to the target starting position corresponding to the next searching of the target frequency point in sequence until the searching times of the cell or the target frequency point reach an upper limit.
Preferably, the method further comprises:
and when the cell is not searched on the target frequency point and the searching times of the target frequency point reach the upper limit, sequentially taking the next candidate frequency point in the candidate frequency point list as a new target frequency point, and searching the cell on the new target frequency point until the cell is searched.
The invention also provides a cell searching system for implementing the cell searching method, which comprises the following steps:
The period acquisition module is used for acquiring the SSB period of the target frequency point;
The search frequency determining module is connected with the period obtaining module and is used for determining the search frequency of the target frequency point according to the SSB period and the preset search time window when the SSB period is larger than the preset search time window;
the initial position determining module is connected with the searching frequency determining module and is used for determining the target initial position of each searching of the target frequency point according to the SSB period and the searching frequency;
And the cell searching module is connected with the initial position determining module and is used for searching cells on the target frequency point according to the current searching times and the corresponding target initial position.
The technical scheme of the invention has the advantages that:
According to the method and the device, the SSB period of the target frequency point is acquired, and when the SSB period is larger than the preset search time window, the search times of the target frequency point are determined according to the SSB period and the preset search time window, so that the target starting position of each search is determined, cell search on the target frequency point is realized, and even if the SSB period is longer, cell search can be effectively performed without a large amount of buffer area storage data, thereby avoiding space waste and improving search efficiency and precision; meanwhile, the searching times and the searching initial position can be flexibly adjusted according to actual conditions, and the flexibility and the adaptability of the system are improved.
Drawings
FIG. 1 is a diagram of a prior art method for receiving data using a fixed search time window of 20ms+3symbol;
fig. 2 is a flow chart of a cell search method according to a preferred embodiment of the invention;
fig. 3 is a flowchart illustrating a process of determining a target frequency point according to a preferred embodiment of the present invention;
fig. 4 is a flowchart illustrating a cell search performed on a target frequency point according to a preferred embodiment of the present invention;
Fig. 5 is a block diagram of a cell search system according to a preferred embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Referring to fig. 2, in a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a cell search method is now provided, which includes:
s1, acquiring an SSB period of a target frequency point;
S2, when the SSB period is larger than a preset search time window, determining the search times of the target frequency point according to the SSB period and the preset search time window;
s3, determining a target starting position of each search of the target frequency point according to the SSB period and the search times;
and S4, searching the cell on the target frequency point according to the current searching times and the corresponding target starting position.
Specifically, considering that in the existing scheme, due to the memory limitation of the mobile phone, for the case of a longer SSB period, the required buffer area is very large, so that the problem of space waste is caused. In the embodiment of the invention, the SSB period of the target frequency point is acquired, and when the SSB period is larger than the preset search time window, the search times of the target frequency point are determined according to the SSB period and the preset search time window, so that the size of a required buffer area is reduced, and the memory space is effectively saved; by determining the target starting position of each search of the target frequency point, invalid searches can be reduced in a segmented search mode, and the search efficiency is improved; even if the actual SSB period is longer, the searching times and the searching initial position can be flexibly adjusted according to the actual situation, so that the situation that a complete SSB is received is ensured, the cell searching is effectively carried out, the flexibility and the adaptability of the system are improved, and the universality of the system is improved.
As a preferred embodiment, the method further comprises:
And when the SSB period is not greater than the preset search time window, searching the cell on the target frequency point according to the preset search time window.
Specifically, the current protocol suggests that the preset search time window of the terminal on each frequency point is set to 20ms. In general, the data is received in a fixed search time window of 20ms+3 symbols, so that the cell search is performed. Thus, in this embodiment, when the SSB period is less than or equal to 20ms, the data is received according to the fixed search time window of 20ms+3symbol, so that it is ensured that a complete SSB is received, and Initial Cell Search (ICS) on the target frequency point is completed.
As a preferred embodiment, as shown in fig. 3, before the SSB period of the target frequency point is acquired, the method includes:
S01, receiving a candidate frequency point list of a cell;
s02, taking the first candidate frequency point in the candidate frequency point list as a target frequency point.
Specifically, in this embodiment, frequency point scanning is performed according to the configured frequency band, and frequency points obtained from the scanning are stored in a candidate frequency point list; and for all the candidate frequency points, according to the 3GPP protocol, the processes of the steps S1-S4 are sequentially executed for each candidate frequency point to perform initial cell search so as to determine resident cells.
Further, if no cell capable of being resided is searched on the first candidate frequency point, continuing to search the initial cell by taking the second candidate frequency point as a target frequency band until a true suitable cell is resided.
In some embodiments, after completing the frequency point scanning, a plurality of candidate frequency points can be screened from the frequency points obtained by the frequency point scanning and stored in a candidate frequency point list for subsequent frequency point selection and management. The screening criteria may be set according to actual requirements, for example, a frequency point with stronger signal strength may be selected, or a frequency point with less interference may be selected.
In some embodiments, in the candidate frequency point list, the candidate frequency points may be ordered from high to low according to signal strength by default, so as to select a frequency point with stronger signal strength, and provide the best communication quality.
As a preferred embodiment, the number of searches is the ratio of SSB period to a preset search time window.
Specifically, in the present embodiment, it is assumed that the SSB period is denoted as M, the preset search time window is denoted as SW, the number of searches is denoted as N, and the number of searches is the ratio of the SSB period to the preset search time window, i.e., n=m/SW. By way of example and not limitation, if SSB period M is 160ms and preset search time window SW is 20ms, search number n=8.
As a preferred embodiment, the number of searches is an upward rounding of the ratio of SSB periods to a preset search time window.
Specifically, in this embodiment, if the SSB period is not an integer multiple of the preset search time window, the ratio is rounded up as the number of searches. By way of example and not limitation, if the ratio of SSB period to preset search time window is 8.4, the number of searches n=9.
As a preferred embodiment, wherein the target starting position is calculated using the following formula:
start(i)＝[(i-1)*SW]mod M
Wherein i represents the current searching times, i=1, 2, …, N is the searching times obtained by calculating the current target frequency point; SW represents a preset search time window; m represents SSB period of the target frequency point; start (i) represents a target start position corresponding to the current search number.
Specifically, in this embodiment, the current search number i is subtracted by 1 and then multiplied by the preset search time window SW, and then the SSB period M of the target frequency point is modulo (remainder) is taken, and the result is the target start position start (i) corresponding to the current search number. By way of example and not limitation, for the case where SSB period M is 160ms, the data may be searched in 8 segments in the manner of 20ms+3symbol in the conventional scheme, and the starting positions of the 8 segments of search intervals are 0, 20, 40, 60, 80, 100, 120, 140, respectively.
Further, the synchronization signal block BURST (Synchronization Signal Block BURST, SSB BURST) is located in one of the 8 segments, and if the data received in the previous segment of search interval does not search for the SSB BURST, the data is continuously received according to the starting position of the next segment of search interval for searching until the SSB BURST is found. By way of example and not limitation, if the SSB BURST is not searched in the search interval of 0-20ms, the radio frequency is turned on next time when 20ms is reached, new data is received, cell search is continued, and if the SSB BURST is searched in the search interval of 20ms-40ms, no re-search is needed for the subsequent interval and the candidate frequency point.
In the embodiment of the invention, under the condition that the SSB period is larger than the preset search time window, the BUFFER only needs to store 20ms+3symbol received data as in the prior art, thereby greatly reducing the size of a required BUFFER area and effectively saving the memory space.
As a preferred embodiment, as shown in fig. 4, performing cell search on the target frequency point includes:
S41, receiving data from a target initial position corresponding to the current search times of the target frequency point;
S42, carrying out initial cell search on the received data.
In some embodiments, after the RF/DFE is turned on, air interface data enters the RF/DFE from the antenna, thereby saving the data one by one in the BUFFER; after the RF/DFE is turned off, the air interface data is no longer entered into the BUFFER.
In some embodiments, a Radio Frequency (RF)/decision feedback equalizer (Decision Feedback Equalizer, DFE) is turned on according to a target starting position corresponding to the current search number to begin receiving data; then, the closing time point of the RF/DFE is calculated according to the counted length, when the data is received or the closing time point of the RF/DFE is reached, the RF/DFE is closed, the data receiving is completed, and at the moment, 20ms+3sym of received data is already stored in the BUFFER.
In some embodiments, for a set count length, such as 20ms, the data may be converted into corresponding points by the sampling rate, and whether the data is received is determined by the calculated points.
As a preferred embodiment, the method further comprises:
And when the current searching times do not search the cell, carrying out cell searching according to the target starting position corresponding to the next searching of the target frequency point in sequence until the searching times of the cell or the target frequency point reach the upper limit.
Specifically, in this embodiment, for the current target frequency point, cell search is performed according to the current target frequency point and the corresponding starting position thereof under the current search times; if the cell which can reside is searched, ending the searching flow; if no resident cell is searched, further judging whether the searching frequency of the current target frequency point reaches an upper limit, wherein the upper limit is the searching frequency obtained by calculation; if the search frequency of the target frequency point does not reach the upper limit, adding one to the search frequency of the target frequency point, and carrying out cell search again at the target starting position corresponding to the next search of the target frequency point until the search frequency of the cell or the target frequency point reaches the upper limit. By continuously adjusting the searching initial position, the size of a required buffer area is reduced, and the memory space is effectively saved.
As a preferred embodiment, the method further comprises:
And when the cell is not searched on the target frequency point and the searching times of the target frequency point reach the upper limit, sequentially taking the next candidate frequency point in the candidate frequency point list as a new target frequency point, and searching the cell on the new target frequency point until the cell is searched.
Specifically, in this embodiment, if no cell is searched on the current target frequency point and the number of searches of the current target frequency point reaches the upper limit, information of the cell which is not searched is returned, a next candidate frequency point is selected from the candidate frequency point list as a new target frequency point, and the same search process is continuously performed until the cell is searched or the candidate frequency point list is traversed.
Referring to fig. 5, the present invention further provides a cell search system, configured to implement the cell search method described above, where the system includes:
the period acquisition module 1 is used for acquiring the SSB period of the target frequency point;
The searching frequency determining module 2 is connected with the period obtaining module 1 and is used for determining the searching frequency of the target frequency point according to the SSB period and the preset searching time window when the SSB period is larger than the preset searching time window;
the initial position determining module 3 is connected with the searching frequency determining module 2 and is used for determining the target initial position of each searching of the target frequency point according to the SSB period and the searching frequency;
the cell searching module 4 is connected with the initial position determining module 3 and is used for searching cells on the target frequency point according to the current searching times and the corresponding target initial position.
Specifically, considering that in the existing scheme, due to the memory limitation of the mobile phone, for the case of a longer SSB period, the required buffer area is very large, so that the problem of space waste is caused. In the embodiment of the invention, the SSB period of the target frequency point is acquired, and when the SSB period is larger than the preset search time window, the search times of the target frequency point are determined according to the SSB period and the preset search time window, so that the size of a required buffer area is reduced, and the memory space is effectively saved; by determining the target starting position of each search of the target frequency point, invalid searches can be reduced in a segmented search mode, and the search efficiency is improved; even if the actual SSB period is longer, the searching times and the searching initial position can be flexibly adjusted according to the actual situation, so that the situation that a complete SSB is received is ensured, the cell searching is effectively carried out, the flexibility and the adaptability of the system are improved, and the universality of the system is improved.
The technical scheme has the advantages that: according to the method and the device, the SSB period of the target frequency point is acquired, and when the SSB period is larger than the preset search time window, the search times of the target frequency point are determined according to the SSB period and the preset search time window, so that the target starting position of each search is determined, cell search on the target frequency point is realized, and even if the SSB period is longer, cell search can be effectively performed without a large amount of buffer area storage data, thereby avoiding space waste and improving search efficiency and precision; meanwhile, the searching times and the searching initial position can be flexibly adjusted according to actual conditions, and the flexibility and the adaptability of the system are improved.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations herein, which should be included in the scope of the present invention.
Claims (10)
1. A cell search method, comprising:
Acquiring an SSB period of a target frequency point;
When the SSB period is larger than a preset search time window, determining the search times of the target frequency point according to the SSB period and the preset search time window;
Determining a target starting position of each search of the target frequency point according to the SSB period and the search times;
and carrying out cell searching on the target frequency point according to the current searching times and the corresponding target starting position.
2. The cell search method of claim 1, further comprising:
And when the SSB period is not greater than the preset search time window, carrying out cell search on the target frequency point according to the preset search time window.
3. The cell search method according to claim 1, wherein the SSB period before the acquisition of the target frequency point includes:
Receiving a candidate frequency point list of a cell;
and taking the first candidate frequency point in the candidate frequency point list as the target frequency point.
4. The cell search method according to claim 1, wherein the number of searches is a ratio of the SSB period to the preset search time window.
5. The cell search method according to claim 1, wherein the number of searches is an upward rounding of a ratio of the SSB period and the preset search time window.
6. The cell search method of claim 1, wherein the target starting position is calculated using the following formula:
start(i)＝[(i-1)*SW]mod M
wherein i represents the current search times; SW represents the preset search time window; m represents the SSB period of the target frequency point; start (i) represents the target start position corresponding to the current search number.
7. The method of claim 1, wherein the performing cell search on the target frequency point comprises:
Receiving data from the target frequency point according to the target initial position corresponding to the current searching times;
And carrying out initial cell search on the received data.
8. The cell search method of claim 1, further comprising:
and when the current searching times do not search the cell, carrying out cell searching according to the target starting position corresponding to the next searching of the target frequency point in sequence until the searching times of the cell or the target frequency point reach an upper limit.
9. The cell search method of claim 1, further comprising:
and when the cell is not searched on the target frequency point and the searching times of the target frequency point reach the upper limit, sequentially taking the next candidate frequency point in the candidate frequency point list as a new target frequency point, and searching the cell on the new target frequency point until the cell is searched.
10. A cell search system for performing a cell search method according to any of claims 1-9, the system comprising:
The period acquisition module is used for acquiring the SSB period of the target frequency point;
The search frequency determining module is connected with the period obtaining module and is used for determining the search frequency of the target frequency point according to the SSB period and the preset search time window when the SSB period is larger than the preset search time window;
the initial position determining module is connected with the searching frequency determining module and is used for determining the target initial position of each searching of the target frequency point according to the SSB period and the searching frequency;
And the cell searching module is connected with the initial position determining module and is used for searching cells on the target frequency point according to the current searching times and the corresponding target initial position.
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| CN202311614671.2A CN117896036A (en) | 2023-11-29 | 2023-11-29 | Cell searching method and system |
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| CN202311614671.2A CN117896036A (en) | 2023-11-29 | 2023-11-29 | Cell searching method and system |
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