CN113225789A - Cell search method, system, device and storage medium - Google Patents
Cell search method, system, device and storage medium Download PDFInfo
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- H04W48/16—Discovering, processing access restriction or access information
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Abstract
The invention provides a cell search method, a system, a device and a storage medium, wherein the cell search method comprises the following steps: when the terminal carries out initial cell search service or cell reselection service, historical service frequency point search is carried out and whether a suitable resident cell is searched or not is judged; after the suitable resident cell is not searched, searching a storage frequency point list and judging whether the suitable resident cell is searched or not; after the suitable resident cell is not searched, searching a preset frequency band and judging whether the suitable resident cell is searched or not; after the suitable resident cell is not searched, carrying out full frequency search of the residual frequency band and judging whether the suitable resident cell is searched or not; if the suitable resident cell is not searched yet, the terminal enters a network loss state, then the terminal wakes up the re-search service after sleeping until the suitable resident cell is searched, so that various choices are provided for the cell search of the terminal, the power consumption of the Internet of things equipment or the Internet of things terminal is reduced, the cell search speed is increased, and the applicability is high.
Description
Technical Field
The present invention relates to the field of internet of things technology, and in particular, to a cell search method, system, device, and storage medium.
Background
In the prior art, a common way to compress the cell search time of NB-IoT is to first store the cell information of the history residence and its neighboring cell information, and preferentially search the stored history frequency points when searching for the cell, and once an effective cell is searched on these frequency points, it is possible to try to read the system information and reside. However, under the following scenes, the problem of long time consumption still exists:
firstly, the terminal is started for the first time to execute full-frequency-band frequency sweeping under the scene without historical information, and the terminal is long in time consumption and large in power consumption. Secondly, due to the movement of the terminal, the stored historical frequency points are invalid and can be degraded into the execution of full-frequency-band search, and the time consumption is too large. And when the network tries to search the cell again after losing the coverage, the full-band search is necessarily executed.
The three scenes can execute full-band network searching, the consumed time reaches about 200s, the power consumption is too large, and the power consumption is contradictory to the low-power-consumption requirement of NB-IoT.
The invention patent with publication number CN 101883412B proposes an initial cell search method under the condition of high-speed movement for LTE, which includes: acquiring a main synchronization signal position and a cell ID number in a receiving sequence; performing frequency offset estimation and compensation, and demodulating the main synchronization signal data to a frequency domain; performing channel estimation by using the data information of the primary synchronization signal; and carrying out coherent demodulation on the auxiliary synchronizing signal according to the cell ID number and the channel estimation result of the main synchronizing signal to obtain a cell ID group number. Under the specific scene of high-speed movement, the method can simply and quickly obtain downlink synchronization and estimate the frequency offset. Although the invention provides the initial cell searching method under the high-speed moving condition, the initial cell searching method is limited under the high-speed moving specific scene, and has some limited conditions, so the initial cell searching method is not suitable for cell searching under a plurality of low-speed moving scenes, and the applicability is not high.
Therefore, it is desirable to provide a cell search method, system, device and storage medium to solve the above-mentioned problems in the prior art.
Disclosure of Invention
The invention aims to provide a cell searching method, a cell searching system, cell searching equipment and a cell searching storage medium, and aims to solve the problems that a terminal executes full-channel network searching in a mobile scene, so that time consumption is too much, power consumption is too large, and the applicability of a searching method is not high.
In order to achieve the above object, the cell search method of the present invention includes steps
A: when the terminal carries out initial cell search service or cell reselection service, historical service frequency point search is carried out and whether a suitable resident cell is searched or not is judged;
b: b, after the suitable resident cell is not searched through the step A, searching a storage frequency point list and judging whether the suitable resident cell is searched or not;
c: after the suitable resident cell is not searched through the step B, searching a preset frequency range and judging whether the suitable resident cell is searched or not;
d: after the suitable resident cell is not searched through the step C, performing full frequency search of the remaining frequency band and judging whether the suitable resident cell is searched or not;
e: and D, judging that the suitable resident cell is not searched, if so, judging that the terminal enters a network loss state, and after entering the network loss state, waking up the re-search service after sleeping until the suitable resident cell is searched.
The cell search method of the present invention has the beneficial effects that:
the cell search method provides various search processes of the historical service frequency point search, the storage list search process, the preset frequency band search and the full-band search of the residual frequency bands, the priorities of the historical service frequency point search, the storage list search process, the preset frequency band search and the full-band search process are from large to small, various choices are provided for the cell search of the terminal, and the defect that the terminal consumes too much time due to the fact that the terminal uses a full-channel network search is avoided.
Preferably, after the suitable resident cell is judged and searched through any one of the step a, the step B, the step C and the step D, the terminal resides in the cell and ends the cell search process. The beneficial effects are that: after any search flow is successfully searched and the resident cell is successfully searched, the search flow is ended, the power consumption of the Internet of things equipment or the Internet of things terminal is reduced, and the cell search speed of the Internet of things equipment or the Internet of things terminal is increased.
Preferably, in the step a, the performing historical service frequency point search includes the steps of:
a10: after a terminal resides in a service cell each time, recording a historical service frequency point and a neighboring frequency point, storing the historical service frequency point to a historical frequency point list, and storing the neighboring frequency point to a storage frequency point list;
a11: searching the historical service frequency point in the historical frequency point list when the terminal carries out initial cell search service or cell reselection service;
a12: and searching a cell to be selected in the historical service frequency point, and after the cell to be selected is searched, selecting the cell to be selected by the terminal to perform a cell residence process. The beneficial effects are that: by acquiring the historical service frequency points which are resident in history, when the terminal is in a static state or the service cell is not changed, the terminal directly searches and acquires the historical service frequency points when the terminal is started, so that the time for searching the frequency points and the cell can be saved to the maximum extent, and the speed for searching the frequency points and the resident cell when the terminal is started or restarted is greatly improved.
Further preferably, in the step a12, when the search for the candidate cell fails, the step B is executed.
Preferably, the cell camping procedure includes the steps of:
a13: reading system information of the cell to be selected;
a14: and after judging that the system information of the cell to be selected meets the residence condition, the terminal resides in the cell to be selected.
Preferably, in step B, the searching for the stored frequency point list includes searching for the frequency points of the neighboring cell frequency point or the preset frequency point list in the stored frequency point list, if the searching for the frequency points of the neighboring cell frequency point or the preset frequency point list is successful, searching for a cell to be selected in the frequency points of the neighboring cell frequency point or the preset frequency point list, and if the searching for the cell to be selected is successful, the terminal selects the cell to be selected to perform a cell residence process.
Preferably, after the terminal resides in the cell, if the current frequency point is judged not to be in the preset frequency point list, the preset frequency point list is updated;
and if the preset frequency point list is judged to be fully loaded, deleting the frequency point which is not used for the longest time in the preset frequency point list, and storing the current frequency point into the preset frequency point list. The beneficial effects are that: and updating new frequency points in time, so that the cell search service and the cell reselection service of the terminal can be conveniently carried out.
Preferably, in the step C, the preset frequency band search includes the steps of:
c10: confirming a currently used operator according to the USIM card, and acquiring a corresponding preset frequency band in the preset frequency band list according to the type of the operator;
c11: and carrying out a preset frequency band fast search process, searching a cell to be selected in the frequency points of the preset frequency band when the frequency points of the preset frequency band are successfully acquired, and selecting the cell to be selected by the terminal to carry out a cell residence process. The beneficial effects are that: compared with full-band search, the search process based on the preset frequency band can greatly reduce the search frequency spectrum width, thereby saving the search time. The preset frequency band searching process is not limited by regions, and can well support the terminal in a mobile state to search frequency points and search cells. The preset frequency band information may be placed in a factory setting.
Further preferably, in the step C11, when the frequency point of the preset frequency band fails to be obtained through the preset frequency band fast search process, the step C12 is executed: carrying out an enhanced slow search process of a preset frequency band, searching a cell to be selected in the frequency points of the preset frequency band when the enhanced slow search process of the preset frequency band succeeds in obtaining the frequency points of the preset frequency band, and selecting the cell to be selected by a terminal to carry out a cell residence process;
and D, when the frequency point of the preset frequency band fails to be acquired through the preset frequency band enhanced slow search process, executing the step D.
Preferably, after the terminal resides in the cell, if the current frequency point is judged not to be in the preset frequency band list, a new frequency band containing the current frequency point is selected and stored in the preset frequency band list. The beneficial effects are that: when a new frequency point is found, the frequency band containing the new frequency point is updated, the frequency band containing the new frequency point is added into a preset frequency band list, better frequency band and frequency point selection are provided for the initial cell search service or reselection service of the terminal which is started next time, and the speed of searching the updated frequency point by the terminal is improved. The beneficial effects are that: and updating new frequency points in time, so that the cell search service and the cell reselection service of the terminal can be conveniently carried out.
Further preferably, the bandwidth of the new frequency band is 1 MHz.
Preferably, in the step D, the full frequency search of the remaining frequency bands includes the steps of:
d10: and performing a residual frequency band fast search process, searching a cell to be selected in the frequency points of the residual frequency band when the frequency points of the residual frequency band are successfully acquired, and selecting the cell to be selected by the terminal to perform a cell residence process.
Further preferably, in the step D10, when the frequency point of the remaining frequency band fails to be obtained through the remaining frequency band fast search process, the step D11 is executed;
d11: carrying out an enhanced slow search process of the remaining frequency band, searching a cell to be selected in the frequency points of the remaining frequency band when the frequency points of the remaining frequency band are successfully acquired, and selecting the cell to be selected by the terminal to carry out a cell residence process;
and E, when the frequency point of the residual frequency band is failed to be acquired through the enhanced slow search process of the residual frequency band, executing the step E.
Further preferably, the remaining frequency bands are obtained by deleting preset frequency bands searched for by the preset frequency bands supported by the terminal.
Preferably, in step E, the waking up and re-searching service after sleeping includes that the terminal enters a sleep state, and the terminal ends the sleep state after the time for entering the sleep state exceeds the sleep time, and then step C is executed.
The invention also provides a cell search system of the terminal, which comprises:
a search unit for searching a cell;
the judging unit is connected with the searching unit and used for judging whether the searching unit searches the suitable resident cell;
and the selection control unit is connected with the judgment unit and the search unit, and controls the terminal to carry out any one or more search processes of historical service frequency point search, storage frequency point search, preset frequency band search and full frequency search of the residual frequency band according to the judgment result of the judgment unit.
The cell search system of the terminal of the invention has the advantages that:
the frequency point and the cell are searched through the searching unit, whether the terminal acquires the frequency point or the resident cell is judged through the judging unit, and the appropriate searching process is selected through the selection control unit, so that the cell searching efficiency of the terminal is improved, the service time delay of full-band searching is avoided, the cell searching efficiency is greatly improved, the cell searching service time delay is reduced, the power consumption of the Internet of things equipment or the Internet of things terminal is reduced, and the applicability is wide.
The invention also provides equipment which comprises a memory and a processor, wherein the memory is connected with the processor, the memory stores a cell search program, and when the cell search program of the terminal stored in the memory is executed by the processor, the cell search method is realized.
The present invention also provides a storage medium storing a computer program which, when executed by a computer, implements the cell search method of the present invention.
The device and the storage medium of the invention have the advantages that:
because the equipment and the storage medium are both used for realizing the cell search method, the equipment and the storage medium both improve the cell search efficiency of the terminal and avoid the service delay of full-band search, thereby greatly improving the cell search efficiency, reducing the cell search service delay and reducing the power consumption of the Internet of things equipment or the Internet of things terminal, and having wide applicability.
Drawings
Fig. 1 is a flowchart of a cell search method according to an embodiment of the present invention;
fig. 2 is a flowchart of historical service frequency point search according to an embodiment of the present invention;
fig. 3 is a flowchart of a cell search camping procedure according to an embodiment of the present invention;
fig. 4 is a flowchart of preset frequency band search according to an embodiment of the present invention;
fig. 5 is a flowchart of a full band search of remaining bands according to an embodiment of the present invention;
fig. 6 is a block diagram of a cell search system of a terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
To solve the problems in the prior art, an embodiment of the present invention provides a cell search method, and fig. 1 is a flowchart of the cell search method of the present invention, and fig. 1 includes steps
A: when the terminal carries out initial cell search service or cell reselection service, historical service frequency point search is carried out and whether a suitable resident cell is searched or not is judged;
b: b, after the suitable resident cell is not searched through the step A, searching a storage frequency point list and judging whether the suitable resident cell is searched or not;
c: after the suitable resident cell is not searched through the step B, searching a preset frequency range and judging whether the suitable resident cell is searched or not;
d: after the suitable resident cell is not searched through the step C, performing full frequency search of the remaining frequency band and judging whether the suitable resident cell is searched or not;
e: and D, judging that the suitable resident cell is not searched, if so, judging that the terminal enters an Out of service (OOS), and after entering the OOS, waking up a re-search service after sleeping until the suitable resident cell is searched.
Through the multistage searching process of the historical service frequency point searching, the stored frequency point list searching, the preset frequency range searching and the full frequency searching of the residual frequency ranges, even if a certain superior searching process fails, any searching process searches a cell suitable for residing, and then the cell searching is stopped. The defects of the previous-stage search can be supplemented and compensated by the next-stage search, so that the fault tolerance of the cell search of the terminal is improved, and the perfectness and the fault tolerance of the cell search process of the terminal are improved.
The cell search method of the present invention has the advantages that:
the cell search method provides various search processes of the historical service frequency point search, the storage list search process, the preset frequency band search and the full-frequency band search of the residual frequency bands, the priorities of the historical service frequency point search, the storage list search process, the preset frequency band search and the full-frequency band search process are from large to small, various choices are provided for the cell search of the terminal, and the cell search speed of the Internet of things equipment or the Internet of things terminal is increased. The cell search method is not only suitable for cell search of the terminal in a static state, but also suitable for cell search of the terminal in a mobile state.
As a preferred embodiment of the present invention, after determining that the suitable resident cell is searched through any one of the steps a, B, C and D, the terminal resides in the cell and ends the cell search process. The advantages are that: after the suitable resident cell is judged and searched through any one of the steps A, B, C and D, the searching process is finished, the power consumption of the Internet of things equipment or the Internet of things terminal is reduced, and the cell searching speed of the Internet of things equipment or the Internet of things terminal is increased.
As a preferred embodiment of the present invention, fig. 2 is a flowchart of a historical service frequency point search according to the present invention, and referring to fig. 2, in step a, the historical service frequency point search includes steps
A10: after a terminal resides in a service cell each time, recording a historical service frequency point and a neighboring frequency point, storing the historical service frequency point to a historical frequency point list, and storing the neighboring frequency point to a storage frequency point list;
a11: searching the historical service frequency point in the historical frequency point list when the terminal carries out initial cell search service or cell reselection service;
a12: and searching a cell to be selected in the historical service frequency point, and after the cell to be selected is searched, selecting the cell to be selected by the terminal to perform a cell residence process. And B, when the cell is not searched in the historical service frequency point, executing the step B. The advantages are that: by acquiring the historical service frequency point and the neighbor frequency point which are resident in history, when the terminal is in a static state or the service cell is not changed, the terminal directly searches the historical frequency point list and acquires the historical service frequency point when being started, so that the time for searching the frequency point and the cell can be saved to the maximum extent, and the speed for searching the frequency point and the resident cell when the terminal is started or restarted can be greatly improved.
It can be said that the history frequency point of the present invention is a history service frequency point obtained after the terminal resides in the cell each time and a plurality of neighboring frequency points around the service cell, and the history frequency point list is used for storing the history service frequency point and the neighboring frequency points. The neighbor frequency points form a neighbor frequency point list, and the neighbor frequency point list can be stored through the storage frequency point list. Therefore, the stored frequency point list and the historical frequency point list both store neighboring frequency points.
The advantages of the terminal for searching the cell through the historical service frequency point search are as follows: the number of frequency points is small, and due to the characteristic that the terminal is located in a certain fixed area in most of time, when the terminal does not exceed the cell coverage range of the serving cell or the adjacent cell, the historical serving frequency point can be used for searching the cell, so that the time for searching the frequency points is greatly shortened, the terminal can quickly and accurately find the appropriate cell and reside, and the cell residence efficiency is improved.
As a preferred embodiment of the present invention, fig. 3 is a flowchart of a cell search camping process according to the present invention, and referring to fig. 3, the cell search camping process includes the steps of:
a13: after searching a plurality of cells to be selected through the cell search resident process, reading system information of the cells to be selected;
a14: and after judging that any cell to be selected meets the residence condition, the terminal resides in the cell to be selected.
It can be supplemented that, in the initial cell search service, after the terminal resides in the cell, the registration process between the terminal and the network needs to be continued, and after the registration is successful, the terminal can normally execute various services of the terminal user. In the non-initial cell search service of the terminal, the terminal may directly perform various services of the user without performing a registration procedure.
As a preferred embodiment of the present invention, the searching for the stored frequency point list includes searching for the frequency points of the neighboring cell frequency point or the preset frequency point list in the stored frequency point list, if the searching for the frequency points of the neighboring cell frequency point or the preset frequency point list is successful, searching for a cell to be selected in the frequency points of the neighboring cell frequency point or the preset frequency point list, and if the searching for the cell to be selected is successful, the terminal selects the cell to be selected to perform a cell residence process. And the preset frequency point list is preset in the pre-factory setting of the terminal.
It can be said that the stored frequency point list includes all neighboring frequency points in the neighboring frequency point list and all preset frequency points in the preset frequency point list.
As a preferred embodiment of the present invention, after the terminal resides in a cell, if it is determined that the current frequency point is not in the preset frequency point list, the preset frequency point list is updated;
and if the preset frequency point list is judged to be fully loaded, deleting the frequency point which is not used for the longest time in the preset frequency point list, and storing the current frequency point into the preset frequency point list. The advantages are that: and updating the frequency points in time to avoid full load of the frequency point list, thereby facilitating the cell search service and cell reselection service of the terminal.
As a preferred embodiment of the present invention, in the step C, fig. 4 is a flowchart of searching the preset frequency band according to the present invention. Referring to fig. 4, the preset bin search includes steps C10-C12.
The step C10 includes: confirming the currently used operator according to USIM (Universal Subscriber Identity Module) global user Identity module information, and acquiring the corresponding preset frequency band in the preset frequency band list according to the type of the operator.
Specifically, the terminal may determine which operator the current USIM card belongs to according to Home Public Land Mobile Network (HPLMN) information of the current USIM, and once the operator is determined, preset frequency band search may be performed in a frequency spectrum range actually supported by the operator.
The step C11 includes: carrying out a preset frequency band fast search process, and if a frequency point of a preset frequency band is searched, carrying out a cell search resident process in the frequency points of the preset frequency band list;
the step C12 includes: if the frequency point of the preset frequency band is not searched in the process of carrying out the quick search of the preset frequency band, carrying out the enhanced slow search process of the preset frequency band, and if the frequency point of the preset frequency band is searched, carrying out the cell search resident process; and if the frequency point of the preset frequency band is not searched in the enhanced slow search process of the preset frequency band, performing full frequency search of the residual frequency band.
Compared with full-band search, the search process based on the preset frequency band can greatly reduce the search frequency spectrum width, thereby saving the search time. The threshold frequency band searching process is not limited by regions, and can well support the terminal in a mobile state to search frequency points and search cells. The preset frequency band information can be preset in factory settings of the terminal.
Because the frequency spectrum allocated by an operator does not occupy the frequency bandwidth of the whole frequency band, only a certain small segment of frequency in a certain frequency band is often allocated, and the time consumed by the frequency sweep of the terminal is increased along with the increase of the frequency band bandwidth or the increase of the number of the scanning frequency points, compared with the full-frequency-band search process, the preset frequency-band search process greatly reduces the width of the searched frequency spectrum and saves the search time.
The advantages of searching the cell through the preset frequency band are as follows: compared with the searching of the stored frequency point list and the searching of the historical service frequency points, the preset frequency band searching has the advantages that the number of the frequency points is more, the range is wider, the limitation of regions is avoided, the cell searching of the terminal in a mobile state can be well supported, the success rate of searching the effective frequency points and the resident cells is improved, and the short boards of the historical service frequency point searching and the stored frequency points are supplemented. Compared with full-band search, the preset frequency band search can greatly shorten the search time, and can cover all the networking frequency points in the preset frequency band, so that the probability of cell residence failure is low.
It can be added that the preset frequency band search of the present invention is affected when the frequency spectrum of the operator is changed. Therefore, the present invention also provides two solutions to solve the cell search problem generated when the frequency spectrum of the operator is changed:
according to the first scheme, software of the terminal is upgraded through external force, the preset frequency range is upgraded, and the preset frequency range is changed and updated.
And secondly, when the effective frequency point outside the preset frequency range is searched, updating the frequency band of the bandwidth of 1MHz before and after the effective frequency point to the preset frequency band in factory equipment through self-learning of the terminal. The second scheme is completely configured by the terminal in a self-adaptive mode, the flexibility is strong, the updated preset frequency range error is within 500KHz, and the influence of the error is small and can be ignored.
The specific method for solving the cell search problem generated when the frequency spectrum of the operator is changed by adopting the second scheme is as follows:
as a preferred embodiment of the present invention, after the terminal resides in the cell, if the current frequency point is determined not to be in the preset frequency band list, a new frequency band including the current frequency point is selected and stored in the preset frequency band list, and the bandwidth of the new frequency band is 1 MHz. The advantages are that: when a new frequency point is found, the frequency band containing the new frequency point is updated, the new frequency band is added into a preset frequency band list, better frequency band and frequency point selection are provided for the initial cell search service or reselection service of the terminal which is started next time, and the speed of searching the updated frequency point by the terminal is improved.
Fig. 5 is a flowchart of a full band search of the remaining bands according to a preferred embodiment of the present invention. In the step D, referring to fig. 5, the full frequency search of the remaining frequency bands includes the steps of:
d10: carrying out a residual frequency band fast search process, and if frequency points of the residual frequency band are searched, carrying out a cell search resident process in the frequency points of the residual frequency band;
d11: if the frequency points of the remaining frequency bands are not searched in the process of carrying out the fast search of the remaining frequency bands, carrying out an enhanced slow search process of the remaining frequency bands, and if the frequency points of the remaining frequency bands are searched, carrying out a cell search resident process; and if the frequency point is not searched in the enhanced slow search process of the residual frequency band, the terminal enters a network loss state.
As a preferred embodiment of the present invention, the remaining frequency bands are obtained by deleting preset frequency bands searched for by the preset frequency bands, from all frequency bands supported by the terminal. Because the remaining frequency band is obtained by deleting the frequency band searched by the preset frequency band from the full frequency band supported by the terminal, the full frequency search of the remaining frequency band is still faster than the traditional full frequency band search.
It can be said that the preset frequency band fast search process in step C11 and the remaining frequency band fast search process in step D10 both use frequency band fast search, i.e., search for a frequency band with Reference Signal Receiving Power (RSRP) above-125 dBm, and the terminal is in a medium-high field in most scenes, so that the frequency band fast search is performed without searching for a frequency band with Reference Signal Receiving Power below-125 dBm, and the search time of the short region can be greatly shortened.
Therefore, the advantages of adopting the frequency band fast search are as follows: the terminal can find the effective frequency point through fast searching in most scenes, so that the full-band searching time can be compressed by more than 50%, and the searching time is saved.
When the frequency band with the reference signal receiving power below-125 dBm is searched, the frequency band fast searching method is difficult to search a proper frequency band or frequency point, and at the moment, the frequency band enhanced slow searching method is suitable for cell searching. In the present invention, both the enhanced slow search process of the preset frequency band in step C12 and the enhanced slow search process of the remaining frequency bands in step D11 use the above-mentioned frequency band enhanced slow search method to search for frequency points and cells. The frequency band enhanced slow search is slightly slower than the frequency band fast search.
As a preferred embodiment of the present invention, in step E, the waking up and re-searching service after sleeping includes that the terminal enters a sleep state, and after the time that the terminal enters the sleep state exceeds the sleep time, the sleep state is ended, and step C is executed. The advantages are that: when the terminal does not search a suitable cell for residence in step A, B, C, D, the terminal enters a sleep state, thereby saving power consumption; and awakening the terminal after the sleep time, and searching the cell from the preset frequency band again. The sleep time here may be set to 60s by a timer.
The present invention also provides a cell search system of a terminal, and fig. 6 is a block diagram of the cell search system of the terminal of the present invention. Referring to fig. 6, the cell search system of the terminal of the present invention includes:
the searching unit 1 is used for searching frequency points and cells;
the judging unit 2 is connected with the searching unit 1 and is used for judging whether the searching unit 1 searches a suitable resident cell;
and the selection control unit 3 is connected with the judgment unit 2 and the search unit 1, and controls the terminal to perform one or more search processes of historical service frequency point search, stored frequency point search process, preset frequency band search and full frequency search of the remaining frequency bands according to the judgment result of the judgment unit 2.
Specifically, when the terminal performs an initial cell search service or a cell reselection service, the selection control unit 3 controls the terminal to perform historical service frequency point search, and the search unit 1 searches cells in the historical service frequency points. Judging whether the cell searched by the searching unit 1 in the historical service frequency point search is a cell to be selected suitable for the terminal to reside by a judging unit 2, and controlling the terminal to reside in the cell to be selected by a selection control unit 3 to finish cell search service;
and when the judgment unit 2 judges that the terminal fails to acquire the cell in the historical service frequency point search, the selection control unit 3 controls the terminal to search the storage frequency point list. Judging whether the cell searched by the searching unit 1 in the stored frequency point list process is a cell to be selected suitable for the terminal to reside through a judging unit 2, and controlling the terminal to reside in the cell to be selected through a selection control unit 3 to finish cell searching service;
and when the judgment unit 2 judges that the terminal fails to acquire the frequency point in the stored frequency point list search or the terminal fails to reside in the cell, the selection control unit 3 controls the terminal to search the preset frequency band. Judging, by the judging unit 2, that the cell searched by the searching unit 1 in the preset frequency band flow is a cell to be selected suitable for a terminal to reside in, and if so, controlling, by the selection control unit 3, the terminal to reside in the cell to be selected, and ending the cell search service;
and when the judgment unit 2 judges that the terminal fails to acquire the frequency point in the preset frequency band search or the terminal fails to reside in the cell, the selection control unit 3 controls the terminal to perform full frequency search of the residual frequency band. And judging that the cell searched by the searching unit 1 in the full frequency search of the remaining frequency band is a cell to be selected suitable for the terminal to reside through the judging unit 2, and controlling the terminal to reside in the cell to be selected through the selection control unit 3 to finish the cell search service.
And when the judgment unit 2 judges that the terminal fails to acquire the frequency point or the resident cell in the full frequency search of the residual frequency band, the terminal is judged to enter a network loss state, and the selection control unit 3 controls the terminal to start a sleep re-search process.
The device also comprises a record updating unit 4 which is connected with the searching unit 1, the judging unit 2 and the selection control unit 3 and is used for recording the historical service frequency point, updating a new frequency point and a new frequency band.
When the judging unit 2 judges that the frequency point searched by the searching unit 1 is a new frequency point which does not exist in the preset frequency point list, the selection control unit 3 controls the record updating unit 4 to update and add the new frequency point into the preset frequency band list. If the storage frequency point of the preset frequency point list reaches the upper limit, the selection control unit 3 controls the record updating unit 4 to enable the record updating unit 4 to delete the frequency point which is not used for the longest time in the preset frequency band list, namely, delete the frequency point at the rightmost end of the preset frequency point list. And adding the new frequency point into a preset frequency point list, and storing the new frequency point into the leftmost end of the preset frequency point list.
When the judging unit 2 judges that the frequency point searched by the searching unit 1 is a new frequency point which is not recorded in the preset frequency band list, the selection control unit 3 controls the record updating unit 4 to enable the record updating unit 4 to intercept a new frequency band of the bandwidth of 1MHz in total at the front end and the rear end of the new frequency point which is not recorded, and store the new frequency band into the preset frequency band list.
The cell search system of the terminal of the present invention has the advantages that:
the frequency point and the cell are searched through the searching unit, whether the terminal acquires the frequency point or the resident cell is judged through the judging unit, and the appropriate searching process is selected through the selection control unit, so that the cell searching efficiency of the terminal is improved, the service time delay of full-band searching is avoided, the cell searching efficiency is greatly improved, the cell searching service time delay is reduced, the power consumption of the Internet of things equipment or the Internet of things terminal is reduced, and the applicability is wide.
The invention also provides equipment which comprises a memory and a processor, wherein the memory is connected with the processor, the memory stores a cell search program, and when the cell search program of the terminal stored in the memory is executed by the processor, the cell search method is realized.
The present invention also provides a storage medium storing a computer program which, when executed by a computer, implements the cell search method of the present invention.
The advantages of the device and the storage medium of the invention are:
because the equipment and the storage medium are both used for realizing the cell search method, the equipment and the storage medium both improve the cell search efficiency of the terminal and avoid the service delay of full-band search, thereby greatly improving the cell search efficiency, reducing the cell search service delay and reducing the power consumption of the Internet of things equipment or the Internet of things terminal, and having wide applicability.
In order to verify the effect of the cell search method of the present invention, the inventors also performed the following experiment: the cell searching scheme of the invention is compared with the prior cell searching scheme by actual measurement, and the prior cell searching scheme has no history resident information. For simplification, the current actual measurement network environment is set to be a single frequency point and a single cell. Under four test scenarios, the cell search scheme of the present invention compares with the existing cell search scheme to obtain the following four test results:
for the convenience of the description and recording of the experiment, the reference signal received power greater than-125 dBm is defined as a medium-strong field, and the reference signal received power less than-125 dBm is defined as a very-weak field.
Firstly, in a medium and high intensity field environment, network cell frequency points in the medium and high intensity field environment are stored in a preset frequency point list in the cell search scheme of the invention, and the network search delay comparison ratio of the existing scheme and the scheme of the invention is shown in table 1.
TABLE 1
Secondly, under the medium and high field environment, the network cell frequency points under the medium and high field environment are not recorded in the preset frequency point list in the cell search scheme of the invention, and the network search delay comparison ratio of the existing scheme and the scheme of the invention is shown in table 2.
TABLE 2
Thirdly, under the extremely weak field environment, the network cell frequency points under the medium and strong field environment are stored in a preset frequency point list in the cell search scheme of the invention, and the network search delay ratio of the existing scheme and the scheme of the invention is shown in table 3.
TABLE 3
Fourth, under the extremely weak field environment, the network cell frequency point under the medium and strong field environment is not recorded in the preset frequency point list in the cell search scheme of the invention, and the network search delay comparison of the existing scheme and the scheme of the invention is shown in table 4.
TABLE 4
From the above measured comparison table of the network searching time delay between the existing scheme and the scheme of the present invention, the cell searching scheme of the present invention has a very obvious optimization compression on the searching time delay in both the medium-high field and the very low field scenes compared with the existing searching scheme. In the fourth scenario, the cell search scheme of the present invention has a smaller search delay compression amplitude than the existing scheme. However, such a scenario needs to satisfy an extremely weak field at the same time, and the current network frequency point does not appear in the preset frequency point list, and the probability of appearance is far lower than 1% in the network searching scenario of the terminal.
Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
Claims (18)
1. A method for cell search, comprising the steps of:
a: when the terminal carries out initial cell search service or cell reselection service, historical service frequency point search is carried out and whether a suitable resident cell is searched or not is judged;
b: b, after the suitable resident cell is not searched through the step A, searching a storage frequency point list and judging whether the suitable resident cell is searched or not;
c: after the suitable resident cell is not searched through the step B, searching a preset frequency range and judging whether the suitable resident cell is searched or not;
d: after the suitable resident cell is not searched through the step C, performing full frequency search of the remaining frequency band and judging whether the suitable resident cell is searched or not;
e: and D, judging that the suitable resident cell is not searched, if so, judging that the terminal enters a network loss state, and after entering the network loss state, waking up the re-search service after sleeping until the suitable resident cell is searched.
2. The cell search method according to claim 1, wherein the terminal camps on the cell and ends the cell search process after determining that the suitable cell is searched in any one of the step a, the step B, the step C and the step D.
3. The cell search method according to claim 1, wherein in the step a, the performing a historical service frequency point search includes the steps of:
a10: after a terminal resides in a service cell each time, recording a historical service frequency point and a neighboring frequency point, storing the historical service frequency point to a historical frequency point list, and storing the neighboring frequency point to a storage frequency point list;
a11: searching historical service frequency points in the historical frequency point list when the terminal carries out initial cell search service or cell reselection service;
a12: and searching a cell to be selected in the historical service frequency point, and after the cell to be selected is searched, selecting the cell to be selected by the terminal to perform a cell residence process.
4. The cell search method according to claim 3, wherein in step A12, when the search for the candidate cell fails, step B is performed.
5. The cell search method of claim 3, wherein the cell camping procedure comprises the steps of:
a13: reading system information of the cell to be selected;
a14: and after judging that the system information of the cell to be selected meets the residence condition, the terminal resides in the cell to be selected.
6. The cell searching method according to claim 3, wherein in the step B, the stored frequency point list searching includes searching the frequency points of the neighboring cell frequency points or the preset frequency point list in the stored frequency point list, if the frequency points of the neighboring cell frequency points or the preset frequency point list are successfully searched, searching the cell to be selected in the frequency points of the neighboring cell frequency points or the preset frequency point list, and if the cell to be selected is successfully searched, the terminal selects the cell to be selected to perform the cell residence process. The "frequency point" here is unclear as to what frequency point is.
7. The cell searching method according to claim 6, wherein after the terminal resides in the cell, if the current frequency point is judged not to be in the preset frequency point list, the preset frequency point list is updated;
and if the preset frequency point list is judged to be fully loaded, deleting the frequency point which is not used for the longest time in the preset frequency point list, and storing the current frequency point into the preset frequency point list.
8. The cell search method of claim 1, wherein in the step C, performing the preset frequency band search comprises the steps of:
c10: confirming a currently used operator according to the USIM card, and acquiring a corresponding preset frequency band in the preset frequency band list according to the type of the operator;
c11: and carrying out a preset frequency band fast search process, searching a cell to be selected in the frequency points of the preset frequency band when the frequency points of the preset frequency band are successfully acquired, and selecting the cell to be selected by the terminal to carry out a cell residence process.
9. The cell searching method of claim 8, wherein the step C11 further comprises, if the acquisition of the frequency point through the preset frequency band fast search procedure fails, executing the step C12: carrying out an enhanced slow search process of a preset frequency band, searching a cell to be selected in the frequency points of the preset frequency band when the enhanced slow search process of the preset frequency band succeeds in obtaining the frequency points of the preset frequency band, and selecting the cell to be selected by a terminal to carry out a cell residence process;
and D, when the frequency point of the preset frequency band fails to be acquired through the preset frequency band enhanced slow search process, executing the step D.
10. The cell search method according to claim 8, wherein after the terminal resides in the cell, if the current frequency point is determined not to be within the preset frequency band list, a new frequency band containing the current frequency point is selected and stored in the preset frequency band list.
11. The cell search method of claim 10, wherein the bandwidth of the new band is 1 MHz.
12. The cell search method according to claim 8, wherein the performing of the full frequency search of the remaining frequency bands in step D comprises:
d10: and performing a residual frequency band fast search process, searching a cell to be selected in the frequency points of the residual frequency band when the frequency points of the residual frequency band are successfully acquired, and selecting the cell to be selected by the terminal to perform a cell residence process.
13. The cell search method of claim 12, wherein the step D10 further comprises, if the frequency point of the remaining frequency band fails to be obtained through the remaining frequency band fast search process, performing the following steps:
d11: carrying out an enhanced slow search process of the remaining frequency band, searching a cell to be selected in the frequency points of the remaining frequency band when the frequency points of the remaining frequency band are successfully acquired, and selecting the cell to be selected by the terminal to carry out a cell residence process;
and E, when the frequency point is failed to be acquired through the enhanced slow searching process of the residual frequency band, executing the step E.
14. The cell search method of claim 12, wherein the remaining bands are obtained by subtracting the preset bands of the preset band search from all bands supported by the terminal.
15. The cell search method according to claim 1, wherein in step E, the waking up and re-searching service after sleeping includes that the terminal enters a sleep state, and the terminal ends the sleep state after determining that the time for entering the sleep state exceeds the sleep time, and then executes step C.
16. A cell search system of a terminal, comprising:
a search unit for searching a cell;
the judging unit is connected with the searching unit and used for judging whether the searching unit searches the suitable resident cell;
and the selection control unit is connected with the judgment unit and the search unit and controls the terminal to carry out any one or more search processes of historical service frequency point search, storage frequency point search, preset frequency band search and full frequency search of the residual frequency band according to the judgment result of the judgment unit.
17. An apparatus comprising a memory and a processor, the memory coupled to the processor, the memory having a cell search program stored therein, the cell search program when executed by the processor implementing the cell search method of any of claims 1-15.
18. A storage medium storing a computer program which, when executed by a computer, implements the cell search method of any one of claims 1 to 15.
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