CN101657003A - Method for searching subdistrict and mobile terminal thereof - Google Patents

Abstract

Embodiments of the present invention provide a cell search method and a mobile terminal. Among them, a cell search method, comprising: according to the ordering relationship of the received signal strength indicator RSSI values of each frequency point in the frequency band from high to low, determine the frequency point with high RSSI value; according to the frequency point with high RSSI value , determining at least one frequency point adjacent to the frequency point with the high RSSI value, to obtain a search frequency point group of the frequency point with the high RSSI value; and searching for a resident cell according to the frequency points in the search frequency point group. According to the frequency point with high RSSI value in the search frequency band and its adjacent frequency points, it can quickly search the cell and improve the speed of obtaining PLMN. It is not necessary to search all frequency points in the frequency band, which overcomes the need to search all frequency points in the frequency band in the prior art , leading to the defects of slow search speed and low work efficiency.

Description

Cell search method and mobile terminal

technical field

The invention relates to the field of communication technology, in particular to a cell search method and a mobile terminal.

Background technique

Based on CDMA (Code Division Multiple Access, code division multiple access) technology, when the mobile terminal is turned on or off the network, it needs to search all frequency points in the specified frequency band BAND (at least one frequency band) to determine whether there is an available frequency in the frequency band. Network resources, such as PLMN (Public LandMobile Network, public land mobile communication network).

The specific process is that the mobile terminal searches for a cell in the frequency band. If the mobile terminal searches for a cell at a certain frequency point, then this frequency point is the working frequency point, then the mobile terminal receives the protocol message broadcast by the cell to find out which cell the cell belongs to. PLMN, and the mobile terminal judges whether the cell can be camped on (that is, whether the cell is a cell that can be camped on). The mobile terminal searches all frequency points in the frequency band, thereby obtaining available PLMNs of all cells that can camp.

After the mobile terminal searches for available PLMNs in the frequency band, it can automatically select or the user manually selects a PLMN, and selects a cell belonging to the PLMN that can be camped on, and then resides in the cell. After that, the mobile terminal can call or The called party establishes an RRC (Radio Resource Control, radio resource control) connection and RB SETUP (Radio Bearer SET UP, radio bearer establishment) with the network side, and starts CS (Circuit Switch, circuit switching) domain service or PS (Packt Switch, packet switching) domain business.

In the course of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

Since the mobile terminal needs to search for all frequency points in the frequency band, if multiple frequency bands are involved, many frequency points are involved, resulting in slow search speed and low work efficiency of the mobile terminal.

Contents of the invention

Embodiments of the present invention provide a cell search method and a mobile terminal, which can realize fast cell search.

Embodiments of the present invention provide a cell search method, including:

According to the ordering relationship of the received signal strength indication RSSI value of each frequency point in the frequency band from high to low, the frequency point with high RSSI value is determined from high to low;

According to the frequency point of the high RSSI value, determine at least one frequency point adjacent to the frequency point of the high RSSI value, and obtain the search frequency point group of the frequency point of the high RSSI value;

Search for cells that can camp on according to the frequency points of the supplementary search frequency point group.

Embodiments of the present invention also provide a mobile terminal, including:

The frequency point determination unit is used to determine the frequency point of high RSSI value from high to low according to the ordering relationship of the received signal strength indication RSSI value of each frequency point in the frequency band from high to low;

The search frequency point determination unit is configured to determine at least one frequency point adjacent to the high RSSI value frequency point according to the high RSSI value frequency point, and obtain the search frequency point group of the high RSSI value frequency point;

The first search unit is configured to search for cells that can camp on according to the frequency points of the supplementary search frequency point group.

It can be seen from the technical solutions provided by the above-mentioned embodiments of the present invention that, according to the frequency point with a high RSSI value in the search frequency band and its adjacent frequency points, it is possible to quickly search for a cell and improve the speed of obtaining the PLMN, and it is not necessary to search for all frequencies in the frequency band. point, which overcomes the defects that the existing technology needs to search all frequency points in the frequency band, resulting in slow search speed and low work efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a first schematic flow diagram of a method for cell search according to an embodiment of the present invention;

FIG. 2 is a second schematic flow diagram of a cell search method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the composition of search frequency point groups according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of frequency points sorted in a method for cell search according to an embodiment of the present invention;

FIG. 5 is a schematic block diagram 1 of a mobile terminal according to an embodiment of the present invention;

FIG. 6 is a schematic block diagram 2 of a mobile terminal according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a frequency point sorting process in a cell search method according to an embodiment of the present invention;

FIG. 8 is a schematic flow diagram of manually searching for a specified PLMN in a cell search method according to an embodiment of the present invention;

FIG. 9 is a schematic flow diagram of automatically searching for a designated PLMN in a cell search method according to an embodiment of the present invention;

FIG. 10 is a schematic flow diagram of manually searching a PLMN list in a cell search method according to an embodiment of the present invention;

FIG. 11 is a flow chart of automatically searching a PLMN list in a cell search method according to an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the present invention provides a cell search method and a mobile terminal. Since the frequency points are sorted according to the RSSI (Received Signal Strength Indicator) values of each frequency point in the frequency band, the frequency points with high RSSI values can be searched preferentially and Its adjacent frequency points do not need to search all frequency points in the frequency band, so as to realize fast cell search and improve the speed of obtaining PLMN.

It can be known that based on CDMA (Code Division Multiple Access, code division multiple access) technology, especially WCDMA (Wide Code Division Multiple Access, bandwidth code division multiple access) technology, in order for mobile terminals to obtain available PLMN (Public Land Mobile Network, public Land mobile communication network), first find the cell by searching the cell, and then determine the PLMN to which the cell belongs and determine whether the cell can reside through the broadcast message of the cell.

The manner of searching for a cell may specifically include a manner of specifying a PLMN search and a manner of searching a PLMN list according to whether there is a pre-specified PLMN. In the specified PLMN search mode or PLMN list search mode, according to whether the mobile terminal user can manually intervene, specifically, an automatic mode or a manual mode may be included. See below for details.

Designated PLMN search method: The AS (Access Stratum, access stratum) of the mobile terminal starts to search for cells on the frequency point according to the designated PLMN issued by the NAS (Non Access Stratum, non-access stratum) until the AS searches for the designated PLMN. cell and the cell is a resident cell, the AS reports the search result to the NAS, and the search process ends.

PLMN list search method: The AS of the mobile terminal needs to search for resident cells in all frequency points of the entire frequency band, and report the PLMNs of the searched resident cells to the NAS to obtain a list of all available PLMNs.

Manual mode: During the cell search process of the mobile terminal, the mobile terminal user can manually intervene, and the mobile terminal user selects the PLMN.

Automatic mode: During the cell search process of the mobile terminal, no manual intervention of the user is required.

Embodiment one

As shown in Figure 1, an embodiment of the present invention provides a method for cell search, including:

Step 11: Determine at least one frequency point with a high RSSI value from high to low according to the order relationship of the received signal strength indicator RSSI values of each frequency point in the frequency band from high to low.

Generally, the RSSI value of the frequency point where the cell is located (that is, the working frequency point) is higher than the RSSI value of other idle frequency points (that is, the non-working frequency point). Therefore, according to the order of the RSSI values of each frequency point in the frequency band from high to low The frequency points with high RSSI values are determined from high to low. In this way, in the process of searching for cells, the frequencies with high RSSI values are searched first, which makes it easier to find the working frequency points where the cells are located, thereby increasing the speed of cell search.

There may be one or more frequency points with high RSSI values. When there is only one frequency point with a high RSSI value, it may be the frequency point with the highest RSSI value in the frequency band, or the frequency point with the second highest value, and so on. When there are multiple frequency points with high RSSI values, they may be sorted from high to low according to the RSSI values, multiple continuous frequency points, or multiple discontinuous frequency points, and so on.

Step 12: According to the frequency point with high RSSI value, at least one frequency point adjacent to the frequency point with high RSSI value is determined to obtain a search frequency point group for the frequency point with high RSSI value.

Since the frequency point with high RSSI value itself may also be a false working frequency point, that is, a false working frequency point, and its adjacent frequency point may be a working frequency point, so the frequency point with high RSSI value and its frequency points can be searched first. Adjacent frequency points, avoid missing possible working frequency points, and improve the speed of searching cells.

That is to determine at least one frequency point adjacent to a frequency point with a high RSSI value. Note that at least one frequency point here is a frequency point adjacent to a frequency point with a high RSSI value in the frequency band, not the RSSI value of each frequency point At least one frequency point adjacent to a frequency point with a high RSSI value after sorting. Moreover, adjacent includes left adjacent, or right adjacent, or left and right adjacent. It can be seen that the search frequency point group of the frequency point with high RSSI value includes the frequency point with high RSSI value and at least one frequency point adjacent to the frequency point with high RSSI value.

When there are multiple frequency points with high RSSI values, the search frequency point groups of frequency points with high RSSI values are sorted according to the RSSI values of frequency points with high RSSI values from high to low, so as to realize the frequency points from high RSSI values The search frequency point group starts to search, thereby increasing the speed of cell search.

Note that when there are multiple frequency bands, the search frequency group is obtained by sorting the frequency RSSI values of all frequency bands from high to low, selecting a frequency point with a high RSSI value and several frequency points adjacent to it, and a high RSSI value The frequency points may appear in any frequency band.

Step 13: Search for cells that can be camped on according to the frequencies of the search frequency group.

Searching the frequency points of the frequency point group, including searching the frequency point with high RSSI value and its adjacent frequency points, can make it easier to find the working frequency point of the cell, avoid missing the possible working frequency points, and thus improve the speed of searching for the cell.

Refer to Figure 3, where the frequency point RSSI values of all frequency bands are sorted from high to low, and the frequency point with the highest RSSI value is selected as an example to describe in detail how to construct a search frequency point group: for example, take the frequency point with the highest RSSI value The 3 frequency points adjacent to the left, and the 4 frequency points adjacent to the right of the frequency point with the highest RSSI value, and the frequency point with the highest RSSI value, the 3 frequency points adjacent to it to the left and the 4 frequency points adjacent to the right frequency points as a search frequency point group. When there are multiple frequency points with high RSSI values, other search frequency point groups for frequency points with high RSSI values can be implemented by reference.

Optionally, before step 13 of searching for cells that can camp on according to the frequency points of the search frequency group, cells may be searched on historical frequency points, where the historical frequency points include the frequency points where the mobile terminal has camped on.

The reason why you need to search for a cell in the historical frequency point first is that when the mobile terminal is turned on or off the network, it usually retains the frequency point information of the cell where it has camped before, so first search for the cell in the historical frequency point, most In some cases, the search speed can be improved, and the cells that can be camped in can be searched more quickly, providing users with better experience.

Optionally, as shown in FIG. 2, the method for cell search in the embodiment of the present invention, after step 13 of searching for a resident cell according to the frequency point of the search frequency point group, further includes:

Step 21: Use each frequency point outside the search frequency point group in the frequency band as a supplementary search frequency point group for the frequency band.

The reason why it is necessary to obtain the frequency points of the supplementary search frequency point group is that in a few cases, the newly emerged cells are neither historical frequency points nor in the search frequency point group with high RSSI value, so the high RSSI value in the frequency band Frequency points other than the value search frequency point group are used as supplementary search frequency point groups to avoid dropping possible working frequency points, and realize the mechanism of sorting all frequency points in the frequency band and searching all frequency points to improve the efficiency of searching cells. speed.

Step 22: sort each frequency point in the supplementary search frequency point group according to its RSSI value from high to low.

Each frequency point of supplementary search frequency point group is sorted according to the RSSI value from high to low. In this way, in the process of searching for the cell, the frequency point with a high RSSI value can be searched first, and the working frequency point of the cell can be found more easily, thereby improving the search efficiency. Cell speed.

Step 23: Search for cells that can be camped on according to the frequencies of the supplementary search frequency group.

The cell is searched according to the frequency points of the supplementary search frequency point group to ensure that all the frequency points in the frequency band can be searched to avoid dropping the possible working frequency points, thereby increasing the speed of cell search.

When there are multiple frequency bands, in step 21, respective supplementary search frequency point groups can be obtained according to each frequency band, and in step 22, the frequency points in each frequency band can be sorted according to the RSSI value, and the supplementary search frequency point groups of each frequency band can be sorted according to Frequency band sorting reflects the search order of each frequency band.

When there are multiple frequency bands, in step 21, the supplementary search frequency point groups of each frequency band are sorted according to the frequency bands, including:

Use the frequency band with a high RSSI value as the frequency band for priority search to increase the speed of cell search; or, you can also use the frequency band where the historical frequency point is located as the frequency band for priority search, or you can also use the frequency band where the searched working frequency point is located As the frequency band to be searched preferentially, other manners of sorting the supplementary search frequency point groups according to the frequency band will not be repeated here. It can be known that the supplementary search frequency point groups are sorted according to frequency bands, including but not limited to the above examples.

Optionally, if the frequency points of the supplementary search frequency point group are continuous, step 22 may also be to sort the frequency points of the supplementary search frequency point group by referring to the search frequency point group described in steps 11-13, For example, take at least one frequency point with a high RSSI value in the supplementary search frequency point group, and then take at least one frequency point adjacent to the frequency point with a high RSSI value to form at least one supplementary search frequency point group, according to the supplementary search frequency point group The frequency point searches for cells that can be camped on.

Optionally, before the step 23 of searching for resident cells according to the frequency points of the supplementary search frequency group, search for cells on historical frequency points. Similarly, you can quickly search for resident cells.

Referring to FIG. 4 , taking a WCDMA network as an example, it is a schematic diagram of sorted frequency points in multiple frequency bands in the cell search method provided by the embodiment of the present invention. The frequency bands stipulated in the WCDMA protocol are BAND1, BAND2, and BAND5, and the supplementary search frequency point groups in each frequency band can be obtained according to the BAND1, BAND2, and BAND5 frequency bands, and the frequency points in each frequency band are sorted according to the RSSI value, and then the frequency points in each frequency band are sorted. The supplementary search frequency point groups are sorted by frequency band, such as BAND1-BAND2-BAND5.

From the above description and referring to FIGS. 3 and 4 , it can be seen that the frequency points in the search frequency point group are generally continuous frequency points, and the frequency points in the supplementary search frequency point group are generally discrete frequency points. Moreover, considering that the WCDMA protocol stipulates that in BAND1, most of the frequency points are continuous, and some frequency points are discontinuous, then those few discontinuous frequency points, that is, discrete frequency points are also used as supplementary search frequency point groups according to Sort the RSSI values from high to low.

The execution subject of the method for cell search in the embodiment of the present invention may be a mobile terminal.

Optionally, the method for cell search in this embodiment of the present invention is applicable to specifying a PLMN search mode and a PLMN list search mode, so as to increase the speed of cell search.

It can be known that, according to the broadcast message sent by the searched cell, the public land mobile communication network (ie, PLMN ID) to which the searched cell belongs can be obtained and whether the searched cell is a resident cell can be determined, and details will not be described here.

Optionally, when the PLMN search mode is specified, the method for cell search in the embodiment of the present invention further includes:

When it is determined that the public land mobile communication network to which the searched cell belongs is a pre-specified public land mobile communication network, and the cell is a cell that can be camped on, the cell search is ended.

That is to say, according to the frequencies of each search frequency point group and supplementary search frequency point group, only when a cell consistent with the pre-designated public land mobile communication network is found, and the cell is a cell that can be camped on, the The cell search can be ended.

Optionally, when the PLMN list search mode is used, the method for cell search in the embodiment of the present invention further includes:

When it is determined that a resident cell is found, at least one frequency point adjacent to the frequency point where the resident cell is located is used as a frequency point for elimination; at the same time, the public land mobile communication network to which the resident cell belongs can be stored in in the network information list. Remove the reject frequency point from the search frequency point group or the supplementary search frequency point group.

Optionally, the adjacency may include left adjacency, right adjacency, or left and right adjacency.

In this way, the cell search is continued according to the search frequency point group or the supplementary search frequency point group, and a list of public land mobile communication networks to which all resident cells belong is obtained.

That is to say, when a resident cell is found, at least one frequency point adjacent to the frequency point where the resident cell is located can be eliminated. When searching for other resident cells again, due to the reduced frequency The number of points increases, and the speed of searching the cell increases accordingly.

The reason why at least one frequency point adjacent to the frequency point of the resident cell can be eliminated is that after the working frequency point of the resident cell is determined, the frequency point adjacent to the general working frequency point is usually an idle frequency point. Therefore, by eliminating idle frequency points, the number of frequency points to be searched is reduced, thereby increasing the speed of cell search. This search method of eliminating at least one frequency point adjacent to the frequency point where the resident cell is located is especially suitable for WCDMA networks.

Embodiment two

As shown in Figure 5, an embodiment of the present invention provides a mobile terminal, including:

The high RSSI value frequency point determining unit 51 is configured to determine at least one high RSSI value frequency point according to the order relationship of the received signal strength indicator RSSI values of each frequency point in the frequency band from high to low.

The search frequency point determining unit 52 is configured to determine at least one frequency point adjacent to the high RSSI value frequency point according to the high RSSI value frequency point, and obtain a search frequency point group of the high RSSI value frequency point.

The first search unit 53 is configured to search for cells that can camp on according to the frequency points of the search frequency point group.

Optionally, the adjacency may include left adjacency, right adjacency, or left and right adjacency.

Optionally, as shown in FIG. 6, the mobile terminal in the embodiment of the present invention may further include:

The first sorting unit 61 is configured to sort the search frequency point group of each high RSSI value frequency point according to the RSSI value of each high RSSI value frequency point from high to low when there are multiple high RSSI value frequency points.

It can be seen that the high RSSI value frequency point determination unit 51, the search frequency point determination unit 52, and the first sorting unit 61 realize the high-to-low sorting relationship according to the RSSI values of each frequency point in the frequency band, and determine the high-to-low frequency point from high to low. In this way, the first search unit 53 can preferentially search for frequencies with high RSSI values during the cell search process, making it easier to find the operating frequency points where the cells are located, thereby increasing the speed of searching cells.

As shown in Figure 6, optionally, the mobile terminal in the embodiment of the present invention may further include:

The supplementary search frequency point determination unit 62 is configured to use each frequency point in the frequency band other than the search frequency point group as a supplementary search frequency point group of the frequency band.

The second sorting unit 63 is configured to sort the frequency points in the supplementary search frequency point group according to their RSSI values from high to low.

The second search unit 64 is configured to search for a cell that can camp on according to the frequency points of the search frequency point group.

Optionally, the second sorting unit 63 may include:

The sorting subunit 631 is configured to sort the supplementary search frequency point groups of each frequency band according to the frequency band when it is determined that there are multiple frequency bands.

The priority sorting subunit 632 is configured to prioritize the frequency bands where the frequency points with high RSSI values are located, or the frequency bands where the historical frequency points are located, or the frequency bands where the cells that can reside are located.

Optionally, the second sorting unit 63 may also be configured to sort the supplementary search frequency point groups of each frequency band according to frequency bands when there are multiple frequency bands. Further, when there are multiple frequency bands, the second sorting unit 63 sorts the supplementary search frequency point groups of each frequency band according to the frequency bands. It can also be that the second sorting unit 63 sorts the frequency band where the frequency point with a high RSSI value is located, or the historical frequency point The frequency band where it is located, or the frequency band where the cell can reside is prioritized. The historical frequency point refers to the frequency point where the cell where the mobile terminal has camped on is located.

It can be seen that the frequency points other than the search frequency point group with high RSSI value in the frequency band are used as supplementary search frequency point groups to avoid dropping possible working frequency points, and to realize the ordering of all frequency points in the frequency band to search for all frequency points Mechanism to increase the speed of cell search. Moreover, the frequency bands where the frequency points with high RSSI values are located, or the frequency bands where the historical frequency points are located, or the frequency bands where the cells can reside are prioritized to increase the speed of searching for cells.

Note that the search frequency point determination unit 52 and the complementary search frequency point determination unit 62 can also realize the functions of both of them by one unit; the high RSSI value frequency point determination unit 51, the first sorting unit 61 and the second sorting unit 63 can also be The functions are realized by one unit; the first search unit 53 and the second search unit 64 can also realize the functions of both of them by one unit, which will not be repeated here.

As shown in Figure 6, optionally, the mobile terminal may also include:

The network determining unit 65 is configured to determine whether the public land mobile communication network to which the searched cell belongs is a pre-designated public land mobile communication network, and/or determine whether the cell is a cell that can be camped on.

The elimination frequency determination unit 66 is configured to use at least one frequency adjacent to the frequency of the resident cell determined by the network determination unit 65 as the elimination frequency, and select the elimination frequency from the search frequency group or supplementary Removed from the search frequency group. Optionally, the adjacency may include left adjacency, right adjacency, or left and right adjacency.

The network information storage unit 67 is configured to store a network information list, and the network information list records the public land mobile communication networks to which all resident cells belong.

As shown in Figure 6, optionally, the mobile terminal may also include:

The historical frequency storage unit 68 is configured to record the frequency of the cell where the mobile terminal has camped.

As shown in Figure 6, optionally, the mobile terminal may also include:

The network information determination unit 69 is configured to obtain the public land mobile communication network to which the searched cell belongs and determine whether the searched cell is a cell that can be camped on according to the broadcast message sent by the searched cell.

The RSSI value obtaining unit 610 is configured to obtain the RSSI value of each frequency point in the frequency band. There can be at least one frequency band.

It can be seen that according to the RSSI value of each frequency point in the frequency band, the frequency points are sorted from high to low, and the frequency point with a high RSSI value and its adjacent frequency points can be searched first, and it is not necessary to search all the frequency points in the frequency band to achieve fast search cell, improve the speed of obtaining PLMN.

Moreover, at least one frequency point adjacent to the frequency point where the searched resident cell is located can be eliminated, so as to reduce the number of search frequency points and increase the speed of cell search.

Embodiment three

Taking the WCDMA network as an example in which a user actively participates in (ie, manually) searches for a cell in a designated PLMN search mode, how the cell search method in the embodiment of the present invention implements the search for a designated frequency point is described below.

Exemplarily, referring to FIG. 3 and FIG. 4, in a WCDMA network, as shown in FIG. 7, the cell search method includes:

701. The mobile terminal sorts the RSSI values of each frequency point in each frequency band (BAND1, BAND2, BAND5) from high to low, and determines the frequency point with the highest RSSI value and the 7 frequency points adjacent to it as the highest RSSI value The frequency point corresponding to the search frequency point group.

Referring to Figure 3, the frequency point with the highest RSSI value and its left adjacent 3 frequency points and right adjacent 4 frequency points can be used as search frequency point group 1. It can be seen that the number of frequency points in search frequency point group 1 is 8 .

702. The mobile terminal determines other 19 frequency points with high RSSI values, and determines 7 frequency points adjacent to each frequency point with high RSSI value, as the search frequency point group 2-20.

According to the RSSI value of each frequency point sorted from high to low, determine the frequency point with the highest RSSI value, and the 19 frequency points with high RSSI value in the subsequent sorting.

Referring to Figure 4, for example, there are 20 frequency points in total for frequency points with high RSSI values, and the number of frequency points in the search frequency point group corresponding to the frequency point with high RSSI value (such as search frequency point group 1-search frequency point group 20) There are 8 frequency points, and 10 search frequency point groups can be used as a large group, and each large group is 80 frequency points (10×8), which can form two search areas 1 and 2.

703. The mobile terminal sorts the corresponding search frequency point groups according to the RSSI values of the 20 frequency points with high RSSI values.

704. The mobile terminal uses each frequency point outside the search frequency point group in each frequency band (BAND1, BAND2, BAND5) as a supplementary search frequency point group for the frequency band.

For example, referring to FIG. 4 , BAND1 , BAND2 , and BAND5 correspond to supplementary search frequency group 1 , supplementary search frequency group 2 , and supplementary search frequency group 3 .

705. The mobile terminal sorts each frequency point in the supplementary search frequency point group according to its RSSI value.

706. The mobile terminal sorts the supplementary search frequency point groups according to frequency bands (BAND1, BAND2, BAND5).

For example, referring to FIG. 4 , BAND1 , BAND2 , and BAND5 correspond to supplementary search frequency group 1 , supplementary search frequency group 2 , and supplementary search frequency group 3 .

Optionally, the cell search method may also include:

707. The mobile terminal confirms the historical frequency point according to the frequency point of the cell where the mobile terminal has camped. Step 707 may be performed before or after any of the above steps 701-706, without limitation.

Optionally, in step 701, 20 frequency points with high RSSI values can be determined according to the ordering of the RSSI values of each frequency point from high to low, and in step 702, the search frequency points for each frequency point with high RSSI value can be determined Group.

As shown in Figure 8, the cell search method also includes:

801. The mobile terminal searches for a cell on historical frequency points. If a cell is found and the PLMN of the cell is a designated PLMN, the search process ends. If not found, go to step 802;

802. The mobile terminal searches for the cell according to the frequency points of the search frequency point group. For example, first search the frequency points of the search frequency point group in the search area 1, and then search for the frequency points of the search frequency point group in the search area 2. If found cell, and the PLMN of the cell is the designated PLMN, the search process ends.

Since the cell is searched manually, the number of frequency points with high RSSI values and the number of frequency points in each search frequency point group can be appropriately larger, so that the possibility of searching for the specified PLMN in the search frequency point group increases as much as possible. , which can improve the speed of cell search.

Generally, step 802 is sufficient to search for the specified PLMN. If the specified PLMN is not found, the mobile terminal prompts the user to choose whether to continue searching for cells. For example, the user can choose to sort the frequency points of the supplementary search frequency point group to perform cell search. When searching for a cell again, the above step 801 can be referred to, and the cell is still searched on the historical frequency points first, and details will not be elaborated.

In the above method, the frequency point with a high RSSI value and its adjacent frequency points are searched preferentially, and it is not necessary to search all frequency points in the frequency band, so as to realize fast cell search and increase the speed of obtaining PLMN.

Embodiment Four

Taking the WCDMA network as an example, in the designated PLMN search mode, the user does not participate in (ie, automatic mode) the cell search process as an example to illustrate how the cell search method in the embodiment of the present invention realizes the search for a designated frequency point.

The methods of cell search include:

Referring to steps 701-707 described in Embodiment 3, the mobile terminal determines 20 frequency points with high RSSI values, and each frequency point with high RSSI value and its left adjacent 3 frequency points and right adjacent 4 frequency points are used as Each search frequency point group, that is, the number of frequency points in each search frequency point group is 8, and the frequency point RSSI values of the 20 high RSSI values are still sorted, and the corresponding search frequency point groups are sorted, a total of 20 search frequency point groups In the frequency point group, 10 are used as a large group, and each large group consists of 80 frequency points (10×8), forming 2 search areas.

And, according to the frequency bands, the mobile terminal sorts the frequency points outside the search frequency point group in each frequency band according to their RSSI values, so as to obtain the supplementary search frequency point groups for each frequency band.

As shown in Figure 9, the cell search method also includes:

901. The mobile terminal searches for a cell on historical frequency points. If a cell is found and the PLMN of the cell is the designated PLMN, the search process ends. If no cell is found, go to step 902;

902. The mobile terminal searches for cells according to the frequency points of each search frequency point group. If a cell is found and the PLMN of the cell is the designated PLMN, the search process is ended. If not found, go to step 903;

903. The mobile terminal searches for a cell according to the order of frequencies in the supplementary search frequency group, and if a cell is found and the PLMN of the cell is the specified PLMN, the search process ends.

Generally, step 902 is sufficient to search for the specified PLMN. It can be seen that by preferentially searching for frequencies with high RSSI values and their adjacent frequencies, it is not necessary to search for all frequencies in the frequency band, so as to realize fast cell search and increase the speed of obtaining PLMN. Moreover, the above method can also realize that the search frequency point group is searched and the supplementary search frequency point group is also searched, so as to avoid missing possible working frequency points and realize the search for all frequency points in the frequency band.

Embodiment five

Taking the WCDMA network, in the PLMN list search mode, the user actively participates in (ie, manual mode) the cell search process as an example to illustrate how the cell search method in the embodiment of the present invention realizes the PLMN list search.

The methods of cell search include:

Referring to steps 701-707 described in Embodiment 3, the mobile terminal determines 20 frequency points with high RSSI values, and each frequency point with high RSSI value and its left adjacent 3 frequency points and right adjacent 4 frequency points are used as Each search frequency point group, that is, the number of frequency points in each search frequency point group is 8, and the frequency point RSSI values of the 20 high RSSI values are still sorted, and the corresponding search frequency point groups are sorted, a total of 20 search frequency point groups In the frequency point group, 10 are used as a large group, and each large group consists of 80 frequency points (10×8), forming 2 search areas.

And, according to the frequency bands, the mobile terminal sorts the frequency points outside the search frequency point group in each frequency band according to their RSSI values, so as to obtain the supplementary search frequency point groups for each frequency band.

As shown in Figure 10, the cell search method also includes:

1001. The mobile terminal searches for a cell on historical frequency points. If a cell that can be camped on is found, add the PLMN of the cell to the network information list, and enter step 1002. If no cell that can be camped on is found, then enter step 1002. 1003;

1002. The mobile terminal eliminates the adjacent frequency points of the searched frequency point where the resident cell is located, for example, 20 frequency points on the left and right of the frequency point where the resident cell is located can be removed;

1003. The mobile terminal searches for cells according to the frequency points of each search frequency point group. For example, first search the frequency point of the search frequency point group in search area 1, and then search for the frequency point of the search frequency point group in search area 2. If the search If you find a resident cell, add the PLMN of the cell to the network information list, if no resident cell is found, go to step 1004, because some frequency points in each search frequency point group may be eliminated Therefore, the number of search frequency points is reduced;

In step 1004, the mobile terminal prompts the user to choose whether to continue searching for cells, and if possible, choose to sort by the frequency points of the supplementary search frequency point group to perform cell search.

The difference from Embodiment 3 and Embodiment 4 is that the mobile terminal may, according to the frequency point of the searched cell that meets the requirements, use the frequency band where the frequency point is located as a priority frequency band, and preferentially search for supplementary search frequency point groups in the priority frequency band.

Different from Embodiment 3 and Embodiment 4, the mobile terminal can also use at least one frequency point on the left and right of the frequency point where the searched cell meets the requirements as the eliminated frequency point, and the number of eliminated frequency points can be fine-tuned.

Since the cell is searched manually, the number of subsequent frequency points of the frequency point with the highest RSSI value and the number of frequency points in each search frequency point group can be appropriately larger, so that the specified PLMN can be searched in the search frequency point group as much as possible. The possibility increases, and the speed of searching for a cell can be improved. When performing the cell search again, the above step 1001 can be referred to, and the cell is still searched on the historical frequency points first, and the description will not be repeated.

In the above method, the mobile terminal first searches for a frequency point with a high RSSI value and its adjacent frequency points, and does not need to search all frequency points in the frequency band, so as to realize fast cell search and increase the speed of obtaining the PLMN. Moreover, the above method reduces the number of search frequency points and improves the search speed.

Embodiment six

In the following, in a WCDMA network, in the PLMN list search mode, the user does not participate in (ie, automatic mode) the cell search process as an example to illustrate how the mobile terminal and the mobile terminal cell search method according to the embodiment of the present invention realize the PLMN list search.

The methods of cell search include:

Referring to steps 701-707 described in Embodiment 3, the mobile terminal determines 20 frequency points with high RSSI values, and each frequency point with high RSSI value and its left adjacent 3 frequency points and right adjacent 4 frequency points are used as Each search frequency point group, that is, the number of frequency points in each search frequency point group is 8, and the frequency point RSSI values of the 20 high RSSI values are still sorted, and the corresponding search frequency point groups are sorted, a total of 20 search frequency point groups In the frequency point group, 10 are used as a large group, and each large group consists of 80 frequency points (10×8), forming 2 search areas.

And, according to the frequency bands, the mobile terminal sorts the frequency points outside the search frequency point group in each frequency band according to their RSSI values, so as to obtain the supplementary search frequency point groups for each frequency band.

As shown in Figure 11, the cell search method also includes:

1101. The mobile terminal searches for a cell on historical frequency points. If a cell that can be camped on is found, add the PLMN of the cell to the network information list, and enter step 1102. If no cell that can be camped on is found, then enter step 1102. 1103;

1102. The mobile terminal eliminates the adjacent frequency points of the frequency point where the cell where the cell can reside can be found, for example, 20 frequency points on the left and right of the frequency point where the cell can reside can be removed;

1103. The mobile terminal searches for cells according to the frequency points of each search frequency point group. If a cell is found, add the PLMN of the cell to the network information list, and enter step 1102. If no cell that can be camped on is found, enter Step 1104, and, since some frequency points in each search frequency point group may be eliminated, the number of search frequency points is reduced;

1104. The mobile terminal searches for cells according to the frequency points of the supplementary search frequency point group. If a cell is found, add the PLMN of the cell to the network information list, and enter step 1102. If no cell that can be camped on is found, end , and since some frequency points in each search frequency point group may be eliminated, the number of search frequency points is reduced.

The difference from Embodiment 3 and Embodiment 4 is that the mobile terminal may, according to the frequency point of the searched cell that meets the requirements, use the frequency band where the frequency point is located as a priority frequency band, and preferentially search for supplementary search frequency point groups in the priority frequency band.

Different from Embodiment 3 and Embodiment 4, the mobile terminal can also use at least one frequency point on the left and right of the frequency point where the searched cell meets the requirements as the eliminated frequency point, and the number of eliminated frequency points can be fine-tuned.

In the above method, the mobile terminal preferentially searches for a frequency point with a high RSSI value and its adjacent frequency points, which can realize fast cell search and increase the speed of obtaining a PLMN. Moreover, the above method reduces the number of search frequency points and improves the search speed. The above method also realizes the search for all frequency points in the frequency band, avoiding dropping possible working frequency points.

It can also be known that although the cell search process of a GSM mobile terminal, a TD-SCDMA mobile terminal, and a CDMA2000 mobile terminal is different, according to the technical scope disclosed in the embodiments of the present invention, corresponding applications can be realized to improve the cell search process. The speed and the speed of obtaining the PLMN will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (13)

1, a kind of method of Cell searching is characterized in that, comprising:

According to the ordering relation from high to low of the received signal intensity indicating RSSI value of each frequency in the frequency range, determine the frequency of at least one high RSSI value from high to low;

According to the frequency of described high RSSI value, determine at least one adjacent frequency of frequency of described high RSSI value, obtain the search frequency group of the frequency of described high RSSI value;

But frequency search persistent district according to described search frequency group.

2, the method for Cell searching according to claim 1 is characterized in that, but after the frequency search persistent district according to described search frequency group, described method also comprises:

With the additional search frequency group of each frequency outside the described search frequency group in the described frequency range as frequency range;

Each frequency of described additional search frequency group is sorted from high to low according to its RSSI value;

But frequency search persistent district according to described additional search frequency group.

3, the method for Cell searching according to claim 1 and 2 is characterized in that, described method also comprises:

Determine to search can be resident the sub-district time, will with described adjacent at least one frequency of place, sub-district frequency that can be resident as rejecting frequency;

Described rejecting frequency is removed from described respectively the search frequency group or the described additional search frequency group.

4, the method for Cell searching according to claim 1 and 2, it is characterized in that, described method also comprises: but before the frequency search persistent district according to described search frequency group, search cell on historical frequency, described historical frequency comprises the frequency at the place, sub-district of the resident mistake of portable terminal;

Perhaps, but before the frequency search persistent district according to described additional search frequency group, search cell on historical frequency.

5, the method for Cell searching according to claim 1 is characterized in that, according to the frequency of described high RSSI value, determines at least one adjacent frequency of frequency of described high RSSI value, obtains the search frequency group of the frequency of described high RSSI value, comprising:

When described high RSSI value frequency when being a plurality of, determine at least one adjacent frequency of frequency of each described high RSSI value, obtain the search frequency group of the frequency of each described high RSSI value;

The search frequency group of described each the high RSSI value frequency RSSI value according to each high RSSI value frequency is sorted from high to low.

6, the method for Cell searching according to claim 2 is characterized in that, each frequency of described additional search frequency group is sorted from high to low according to its RSSI value, comprising:

When described frequency range when being a plurality of, each frequency of the additional search frequency group of described each frequency range is sorted from high to low according to its RSSI value;

The additional search frequency group of described each frequency range is sorted according to frequency range.

7, the method for Cell searching according to claim 6 is characterized in that, described additional search frequency group with described each frequency range sorts according to frequency range, comprising:

With the frequency place frequency range of high RSSI value, or historical frequency place frequency range, or place, sub-district frequency range priority ordering that can be resident.

8, a kind of portable terminal is characterized in that, comprising:

High RSSI value frequency determining unit is used for the ordering relation from high to low according to the received signal intensity indicating RSSI value of each frequency in the frequency range, determines the frequency of at least one high RSSI value from high to low;

Search frequency determining unit is used for the frequency according to described high RSSI value, determines at least one adjacent frequency of frequency of described high RSSI value, obtains the search frequency group of the frequency of described high RSSI value;

First search unit, but be used for searching for persistent district according to the frequency of described search frequency group.

9, portable terminal according to claim 8 is characterized in that, described portable terminal also comprises:

Replenish search frequency determining unit, be used for the additional search frequency group of each frequency outside the described search frequency group in the described frequency range as frequency range;

Second sequencing unit is used for each frequency of described additional search frequency group is sorted from high to low according to its RSSI value;

Second search unit, but be used for searching for persistent district according to the frequency of described additional search frequency group.

10, according to Claim 8 or 9 described portable terminals, it is characterized in that described portable terminal also comprises:

Reject the frequency determining unit, be used to determine to search can be resident the sub-district time, will with described adjacent at least one frequency of place, sub-district frequency that can be resident as rejecting frequency, described rejecting frequency is removed from described respectively the search frequency group or the described additional search frequency group.

11, according to Claim 8 or 9 described portable terminals, it is characterized in that described portable terminal also comprises:

Historical frequency memory cell is used to write down the frequency at the place, sub-district of the resident mistake of portable terminal;

The 3rd search unit, be used for can be resident according to the search of historical frequency the sub-district.

12, portable terminal according to claim 8 is characterized in that, described portable terminal also comprises:

First sequencing unit is used for when the frequency of described high RSSI value when being a plurality of, and the search frequency group of the frequency of described each the high RSSI value RSSI value according to the frequency of each high RSSI value is sorted from high to low.

13, portable terminal according to claim 9 is characterized in that, described second sequencing unit comprises:

The ordering subelement when being used for determining that described frequency range is a plurality of, sorts the additional search frequency group of described each frequency range according to frequency range;

The priority ordering subelement is used for the frequency place frequency range with high RSSI value, or historical frequency place frequency range, or place, sub-district frequency range priority ordering that can be resident.

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