CN105744599A

CN105744599A - Cell search method and apparatus, and user equipment

Info

Publication number: CN105744599A
Application number: CN201610111155.1A
Authority: CN
Inventors: 叶嘉金琦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-02-29
Filing date: 2016-02-29
Publication date: 2016-07-06

Abstract

The embodiment of the invention discloses a cell search method and apparatus, and user equipment. The method comprises the following steps: determining a target frequency point in a frequency band supported by the user equipment, wherein the frequency band comprises at least one frequency point, and the target frequency point is a frequency point whose energy value is higher than a preset energy threshold in the at least one frequency point; carrying out cell search on the target frequency point, and detecting whether a first cell exists at the target frequency point according to a search result of the cell search; and if so, storing the target frequency point to carry out residence on all cells at the target frequency point in sequence. By adopting the method disclosed by the embodiment of the invention, the problem of network disconnection due to the failure of search of an accessible secondary cell at a non-historical frequency point can be solved.

Description

Cell search method, device and user equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a cell search method, an apparatus, and a user equipment.

Background

In a wireless communication system, when a User Equipment (UE) is in a connected state and exits a service area, such as a Wideband Code Division Multiple Access (WCDMA) cell, a network searching procedure needs to be performed to redetermine a cell where the UE can camp, so as to recover normal service, where the network searching procedure is as follows: firstly, cell search is carried out on historical frequency points where UE resides in sequence, all WCDMA cells under each historical frequency point are obtained, and residence is tried in sequence. If the UE still cannot successfully reside in a certain cell after network searching is finished, initiating full-band network searching for the frequency band (band) supported by the UE, namely sequentially performing cell searching on the frequency band (band) with higher energy in the band supported by the UE, acquiring a cell (strongest cell) with highest energy under the frequency point, and sequentially trying to reside in the cell. And if the UE is not resident after the full-band network searching is carried out and the UE supports other network systems, switching the network systems to carry out the network searching. If the UE does not reside after the system is switched, network loss occurs (the UE is also in a network loss state in the network searching process).

In the process of searching the network in the full frequency band, because only the strongest cell under a frequency point is obtained by searching the cell with higher energy, if the strongest cell under a certain frequency point (non-historical frequency point) in the environment does not meet the residence condition under certain conditions, for example, the strongest cell is set to be forbidden to be accessed, but when an accessible secondary strongest cell (with energy lower than that of the strongest cell) exists under the frequency point, the accessible secondary strongest cell cannot be searched, and network loss is caused.

Disclosure of Invention

The embodiment of the invention provides a cell searching method, a cell searching device and user equipment, which can solve the problem of network loss caused by the fact that a secondary strong cell which can be accessed under a non-historical frequency point cannot be searched.

In a first aspect, an embodiment of the present invention provides a cell search method, including:

determining a target frequency point from a frequency band supported by user equipment; cell search is carried out aiming at the target frequency point, and whether a first cell exists under the target frequency point is detected according to the search result of the cell search; and if so, storing the target frequency point so as to sequentially initiate residence for all cells under the target frequency point.

The frequency band comprises at least one frequency point, the target frequency point is a frequency point of which the energy value in the at least one frequency point is higher than a preset energy threshold value, and the number of the target frequency points can be one or more. Further, the first cell may refer to any cell under each target frequency point, such as a cell with the highest energy value (the strongest cell) under the target frequency point.

Optionally, in some embodiments, the storing the target frequency point may specifically be:

and adding the target frequency point to a historical frequency point list of the user equipment.

The frequency points in the historical frequency point list may include frequency points of a cell in which the user equipment has successfully resided, that is, historical frequency points, and the target frequency point (and may also include frequency points added by the technical scheme of the embodiment of the present invention before the network searching process). Therefore, when the next wheel searches the designated frequency points of the frequency points in the historical frequency point list, all cells (including all cells under the target frequency point) under each frequency point in the historical frequency point list can be sequentially obtained, and each cell is sequentially initiated to reside, and whether the residence is successful or not is detected.

Further, in some embodiments, the cell search mode when performing cell search for the target frequency point may be frequency point list search, and the first cell is a cell with the highest energy value at the target frequency point; the method further comprises the following steps:

initiating camping on the first cell; if the user equipment fails to reside in the first cell, performing designated frequency point search on the frequency points in the historical frequency point list added with the target frequency point to obtain all cells under the frequency points in the historical frequency point list; and initiating residence to each cell under the frequency points in the historical frequency point list in sequence. Therefore, when the accessible second strong cell exists, the user equipment can detect the second strong cell and successfully reside in the second strong cell so as to prevent long-time network loss.

Optionally, in some embodiments, the target frequency point may include a plurality of frequency points; the initiating the camping on the first cell comprises:

initiating residence to a first cell under each target frequency point in sequence; and when the first cells under the multiple target frequency points are all subjected to residence failure, determining that the user equipment fails to reside in the first cells.

Optionally, in some embodiments, if only one target frequency point is used, it may be determined that the user equipment has failed to camp on the first cell when it is detected that camping on the first cell fails.

Further, in some embodiments, before performing the designated frequency point search on the frequency points in the historical frequency point list to which the target frequency point is added, the method further includes:

when the user equipment fails to reside in a first cell, acquiring a network type supported by the user equipment; sequentially switching the current network system to each network system supported by the user equipment to search a cell to obtain a cell under the network system; initiating residence to each cell under the obtained network system in sequence; and if the obtained residence of all the cells under the network mode supported by the user equipment fails, executing the step of performing the designated frequency point search on the frequency points in the historical frequency point list added with the target frequency points. Thereby initiating a new network search to determine the cell where the user equipment can reside. Optionally, the new network searching process may be initiated immediately after the first network searching fails, or initiated after a preset network searching condition is met, for example, a backoff mechanism according to a preset time is backed off, which is not limited in the embodiment of the present invention.

Further, in some embodiments, before determining the target frequency point from the frequency bands supported by the user equipment, the method further includes:

when detecting that the connection state of the user equipment is in an out-of-service area, performing appointed frequency point search on the frequency points in the historical frequency point list of the user equipment; and if the user equipment fails to reside in the cell after the designated frequency point is searched, executing the step of determining the target frequency point from the frequency band supported by the user equipment.

Optionally, the designated frequency point search may also be initiated for the frequency point of the neighboring cell of the corresponding cell when the cell exits from the service area.

In a second aspect, an embodiment of the present invention provides a cell search apparatus, including: the device comprises a frequency point determining unit, a searching unit and a storage unit; wherein,

and the frequency point determining unit is used for determining the target frequency point from the frequency band supported by the user equipment.

The searching unit is used for searching the target frequency point for a cell and detecting whether a first cell exists under the target frequency point according to a searching result of the cell searching;

and the storage unit is used for storing the target frequency point when the detection result of the search unit indicates that the first cell exists, so as to sequentially initiate residence for all cells under the target frequency point.

The frequency band supported by the user equipment comprises at least one frequency point, the target frequency point is a frequency point of which the energy value in the at least one frequency point is higher than a preset energy threshold value, and the number of the target frequency points can be one or more. Further, the first cell may refer to any cell under each target frequency point, such as a cell with the highest energy value (the strongest cell) under the target frequency point.

Optionally, in some embodiments, the storage unit may be specifically configured to:

The frequency points in the historical frequency point list may include frequency points of a cell in which the user equipment has successfully resided, that is, historical frequency points, and the target frequency point (and may also include frequency points added by the technical scheme of the embodiment of the present invention before the network searching process). Therefore, when the next round of designated frequency point search is carried out on the frequency points in the historical frequency point list, all cells (including all cells under the target frequency point) under each frequency point in the historical frequency point list can be obtained in sequence, and each cell is initiated to reside in sequence, and whether the residence is successful or not is detected.

Further, in some embodiments, the cell search mode when performing cell search for the target frequency point is frequency point list search, and the first cell is a cell with the highest energy value at the target frequency point; the apparatus may further comprise:

a camping unit, configured to initiate camping on the first cell;

the searching unit is further configured to perform designated frequency point search on the frequency points in the historical frequency point list to which the target frequency point is added when the user equipment fails to reside in the first cell, and acquire all cells under the frequency points in the historical frequency point list;

and the residence unit is also used for initiating residence to each cell under the frequency points in the historical frequency point list in sequence.

Therefore, when the accessible second strong cell exists, the user equipment can detect the second strong cell and successfully reside in the second strong cell so as to prevent long-time network loss.

Optionally, in some embodiments, the target frequency point may include a plurality of frequency points; the specific manner of initiating the camping by the camping unit to the first cell may be:

initiating residence to a first cell under each target frequency point in sequence;

and when the first cells under the multiple target frequency points are all subjected to residence failure, determining that the user equipment fails to reside in the first cells.

Optionally, in some embodiments, if only one target frequency point is located, the camping unit may determine that the user equipment unsuccessfully camps in the first cell when detecting that camping in the first cell fails.

Further, in some embodiments, the apparatus further comprises:

a system obtaining unit, configured to obtain a network system supported by the user equipment when the user equipment fails to camp in the first cell;

the searching unit is further configured to sequentially switch the current network standard to each network standard supported by the user equipment to perform cell search, and obtain a cell under the network standard;

the resident unit is further configured to initiate a resident on each acquired cell in the network system in sequence, and notify the search unit to perform designated frequency point search on the frequency points in the historical frequency point list to which the target frequency point is added when all the acquired cells in the network system supported by the user equipment fail to reside. Thereby initiating a new network search to determine the cell where the user equipment can reside.

Further, in some embodiments,

the searching unit is further configured to perform designated frequency point search on the frequency points in the historical frequency point list of the user equipment when it is detected that the connection state of the user equipment is in the service-out area, and notify the frequency point determining unit to determine the target frequency point from the frequency bands supported by the user equipment when the cell where the user equipment resides fails after the designated frequency point search.

In a third aspect, an embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a program, and the program includes, when executed, some or all of the steps of the cell search method in the first aspect.

In a fourth aspect, an embodiment of the present invention further provides a user equipment, including: the device comprises a communication interface, a memory and a baseband processor, wherein the baseband processor is respectively connected with the communication interface and the memory; wherein,

the memory is used for storing driving software;

the baseband processor reads the driver software from the memory and executes a part or all of the steps of the cell search method of the first aspect described above under the action of the driver software.

The embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, a target frequency point with an energy value higher than a preset energy threshold value is determined from a frequency band which is supported by user equipment and comprises a plurality of frequency points, cell search is carried out on the target frequency point, whether a cell exists under the target frequency point is detected, and the target frequency point is stored when the cell exists, so that all cells under the target frequency point are searched, and residence is initiated on all cells under the target frequency point in sequence, thereby avoiding the problem that when a strongest cell which does not have a historical frequency point exists in the environment, the strongest cell cannot be searched when the strongest cell does not meet residence conditions, such as being set as access prohibition, and the like, but when a strongest cell which can be resided exists, the strongest cell cannot be searched, and network loss is caused for a long time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a network architecture diagram of a wireless communication system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a cell search method according to an embodiment of the present invention;

fig. 4 is an interaction diagram of a cell search method according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a cell search apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of another user equipment according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

It should be understood that the technical solution of the embodiment of the present invention may be specifically applied to a wireless communication system that distinguishes cells by frequency points and scrambling codes, such as a Wideband Code Division Multiple Access (WCDMA) system, and may also be applied to a future network, and the embodiment of the present invention is not limited thereto.

It should be understood that the wireless communication system of the embodiment of the present invention may include a wireless network device and a User Equipment (UE). The wireless network device may be a base station or an access point, and is configured to provide a communication service for at least one user equipment. One or more transmitting antennas and one or more receiving antennas are adopted between the wireless network equipment and the user equipment for signal transmission. Fig. 1 is a network architecture diagram of a wireless communication system according to an embodiment of the present invention, where a wireless network device 1 and any user equipment 2 may communicate with each other through one or more antennas, and fig. 1 illustrates multiple antennas as an example. Further optionally, the wireless communication system in which the wireless network device and the user equipment are located in fig. 1 may further include other network entities such as a mobility management entity, which is not limited in the embodiment of the present invention.

In the embodiment of the present invention, the ue may also be referred to as a terminal (terminal), a wireless terminal, a Mobile Station (MS), a mobile terminal (mobile station), or the like. Which may communicate with one or more core networks via a radio access network (e.g., RAN), user equipment may be mobile terminals such as mobile telephones (or "cellular" telephones), tablets, personal digital assistants, and computers having mobile terminals, as well as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices that exchange language and/or data with the radio access network. In this embodiment of the present invention, when the wireless network device is a base station, the base station may be a base station in WCDMA, such as a NodeB, or a base station in a future network, and the embodiment of the present invention is not limited thereto.

The structure of the user equipment in the wireless communication system is described below, and as shown in fig. 2, each user equipment in the wireless communication system includes a Radio Frequency (RF) part and a baseband processor, wherein the RF part includes an antenna, a radio frequency front end (rff) and a radio frequency chip (RFIC). RF may be used to modulate a transmit signal from baseband for transmission over an antenna (transmit channel), and may also be used to demodulate an air interface signal received via an antenna and send it to a baseband processor at the back end for processing according to a communication protocol (receive channel). Wherein, the RFFE includes: a duplexer for implementing an antenna array, i.e., coupling both a transmit path and a receive path (as indicated by arrows) to an antenna, so that the antenna can transmit or receive signals or transmit and receive signals simultaneously; the antenna also includes a Power Amplifier (PA) for amplifying the power of the transmission signal on the transmission path, so that the power-amplified transmission signal can be transmitted from the antenna. RFIC is a modulation and demodulation unit, where modulation refers to converting a low-frequency signal (referred to as "baseband signal") of a baseband into a high-frequency RF signal on a transmission path (i.e., up-converting, which may be implemented by an up-converter shown in fig. 2), and demodulation refers to demodulating a high-frequency RF signal into a baseband signal on a reception path (i.e., down-converting, which may be implemented by a down-converter shown in fig. 2). An up/down converter, i.e., a mixer, which generates a high frequency RF signal by mixing a baseband signal with a local oscillator signal, thereby implementing modulation; the down-converter generates a baseband signal by mixing the high frequency RF signal with a local oscillator signal, thereby implementing demodulation. Optionally, a Low Noise Amplifier (LNA) may be further included in the receive path before demodulation, for amplifying the received signal, as shown in the dotted line in fig. 2. In addition, the baseband part (baseband processor) mainly processes the baseband signal according to a communication protocol, which can process various communication protocols such as 2/3/4G.

It should be understood that the technical solution of the embodiment of the present invention can be specifically applied to the above baseband processor, and the baseband processor may include a baseband processing unit for processing physical layer tasks and a processor for processing higher layer tasks, where the higher layer tasks include a non-access stratum (NAS) and an Access Stratum (AS).

It should be understood that when detecting that the ue is in an out-of-service state, a cell search is performed to reacquire an accessible cell. Taking WCDMA system as an example, the cell search may be initiated by a WCDMA access layer, and the search for a WCDMA cell that may exist in a wireless environment is completed through a WCDMA physical layer, where the WCDMA cell is distinguished by a frequency point and a scrambling code. The frequency points of the cells in the environment can be obtained by frequency sweeping, and the scrambling codes of the cells can be obtained by cell searching. In addition, the energy of the cell, such as a Received Signal Strength Indicator (RSSI) for indicating energy information, a Received Signal Code Power (RSCP) or a signal to interference ratio Ec/N0 (or "ECN 0"), may also be obtained through cell search. Where Ec refers to the energy of a single user in a cell, such as the energy of a received chip, in joules, and N0 refers to noise interference, and Ec/N0 is often used to measure the quality of a pilot channel.

The cell search can be divided into designated frequency point search, candidate cell search and frequency point list search according to different search modes. The searching mode of the appointed frequency point searching is that a single frequency point information is issued by an access layer, a scrambling code of a possibly existing cell is found on the frequency point through a physical layer, so that the cell searched under the frequency point, namely the cell corresponding to the scrambling code, is determined, and the cell searched under the frequency point is returned to the access layer; the candidate cell search is also called as appointed scrambling code search, and the access layer issues the frequency point and the scrambling code of the cell to the physical layer, so that the physical layer omits the process of descrambling code; the implementation mode of the frequency point list search is the same as the appointed frequency point search, namely that an access layer issues a frequency point list, all frequency points in the frequency point list are subjected to cell search through a physical layer, the search result of the frequency point with the strongest energy is reported and returned to the information of the strongest cell under each frequency point in the frequency point list of the access layer, and the access layer tries to reside the strongest cell under each frequency point in sequence according to the returned information of the strongest cell under each frequency point. In addition, a full-band network search also exists in the network search process, which means that frequency bands (bands) supported by the UE are sequentially subjected to frequency scanning at a frequency point with an energy value higher than a certain threshold value in partial frequency points after being spaced according to a certain frequency point number, a plurality of adjacent front and back frequency points of the frequency point are taken together, a frequency point with higher energy such as the maximum RSSI value is determined, a frequency point list search is initiated at the frequency point, and the strongest cell under the frequency point is obtained and resident.

The embodiment of the invention discloses a cell searching method, a cell searching device and user equipment, which can solve the problem of network loss caused by the fact that a second-strength cell which can be accessed under a non-historical frequency point cannot be searched. The details are described below.

Fig. 3 is a schematic flow chart of a cell search method according to an embodiment of the present invention. Specifically, as shown in fig. 3, the cell search method according to the embodiment of the present invention may include the following steps:

101. and determining a target frequency point from the frequency band supported by the user equipment.

The frequency band (band) supported by the User Equipment (UE) includes at least one frequency point, the target frequency point is a frequency point in which the energy value in the at least one frequency point is higher than a preset energy threshold, and the target frequency point may be one or more (two or more) frequency points. Further, the first cell may refer to any cell under each target frequency point, such as a cell with the highest energy value (the strongest cell) under the target frequency point.

In a specific embodiment, before a target frequency point is determined from a frequency band supported by the UE, when it is detected that the connection state of the user equipment is in an out-of-service area, a designated frequency point search may be performed on a frequency point in a historical frequency point list of the user equipment; and if the user equipment fails to reside in the cell after the designated frequency point is searched, executing the step of determining the target frequency point from the frequency band supported by the user equipment. The frequency points in the historical frequency point list may include frequency points of a cell in which the UE has successfully resided, that is, historical frequency points, frequency points stored inside the UE, frequency points of a neighboring cell of a resident cell, and the like, and may also include frequency points added by the technical scheme of the embodiment of the present invention before the network searching process.

Specifically, when the UE is in the out-of-service area in the connected state, for example, due to the fact that the energy of the current cell is too low, the scrambling code decoding of the current cell fails, the signal is not good because the UE is far away from the base station, and the like, the UE needs to perform a network searching procedure, that is, perform cell searching, so as to re-determine the cell to which the UE can access to perform communication. Specifically, when the UE exits the service area, the UE may sequentially perform designated frequency point search on the neighboring cells and the frequency points in the stored historical frequency point list, obtain all cells corresponding to the frequency points in the historical frequency point list, and sequentially try to camp on the cells.

Further, if all cells corresponding to the frequency points in the historical frequency point list fail to reside, full-band network searching can be performed, and a target frequency point with an energy value higher than a preset energy threshold value is determined from a plurality of frequency points included in the frequency band supported by the UE. Specifically, in the full-band network searching stage, the UE may perform rough scanning first, i.e., determine a frequency point with an energy value higher than a preset energy threshold from a plurality of frequency points included in the supported frequency band, and obtain n frequency points around the frequency point to obtain (2n +1) frequency points in total. And then, finely scanning the (2n +1) frequency points, namely screening the frequency point with the highest energy value from the (2n +1) frequency points, and determining the frequency point with the highest energy value as a target frequency point. The energy value may be specifically an RSSI value, and the RSSI value may be obtained by statistics according to the obtained RSCP and ECN0 values, which is not described herein again.

102. And carrying out cell search aiming at the target frequency point, and detecting whether a first cell exists under the target frequency point according to a search result of the cell search.

Specifically, the first cell may be a strongest cell under the target frequency point, that is, a cell with a highest energy value (such as RSSI, RSCP, ECN0 value, and the like), and then the cell search performed for the target frequency point may be a frequency point list search, so as to determine whether a cell exists under the target frequency point and determine the strongest cell therefrom.

103. And if so, storing the target frequency point so as to sequentially initiate residence for all cells under the target frequency point.

Optionally, the storing the target frequency point may specifically be: and adding the target frequency point to a historical frequency point list of the user equipment.

Further, the cell search mode when performing cell search for the target frequency point may be frequency point list search, and the first cell is a cell (strongest cell) with the highest energy value at the target frequency point; the user equipment can also initiate camping on the first cell; if the user equipment fails to reside in the first cell, performing designated frequency point search on the frequency points in the historical frequency point list added with the target frequency point to obtain all cells under the frequency points in the historical frequency point list; and initiating residence to each cell under the frequency points in the historical frequency point list in sequence. Specifically, when a first cell is detected to exist under the target frequency point, the target frequency point may be stored, for example, the frequency point of the first cell, that is, the target frequency point, is added to a historical frequency point list of the UE, and the historical frequency point list is updated, so that all cells under the target frequency point are searched and the camping is initiated.

Optionally, the target frequency point may include a plurality of frequency points; the initiating the camping on the first cell may specifically be: initiating residence to a first cell under each target frequency point in sequence; and when the first cells under the multiple target frequency points are all subjected to residence failure, determining that the user equipment fails to reside in the first cells.

Optionally, the initiating the camping on the first cell may specifically be: if only one target frequency point is available, it may be determined that the user equipment fails to camp in the first cell when it is detected that camping in the first cell fails.

Further, before searching the designated frequency points of the frequency points in the historical frequency point list added with the target frequency points, when the user equipment fails to reside in the first cell, the network standard supported by the user equipment can be acquired; sequentially switching the current network system to each network system supported by the user equipment to search a cell to obtain a cell under the network system; initiating residence to each cell under the obtained network system in sequence; and if the obtained residence of all the cells under the network mode supported by the user equipment fails, executing the step of performing the designated frequency point search on the frequency points in the historical frequency point list added with the target frequency points. Specifically, if the UE does not reside after performing the full-band network search and the UE supports other network systems, the network search may be switched to the network, for example, switching from searching a WCDMA cell to searching a Long Term Evolution (LTE) cell or a GSM cell. And after the network modes are switched, if the UE still fails to reside in the searched cell, sequentially searching all the frequency points in the historical frequency point list added with the target frequency point by using the designated frequency point, and performing a second round of network searching. Therefore, when a strongest cell under a certain frequency point in the environment is set as a secondary strong cell which can not be resided due to forbidden access, the embodiment of the invention can search the secondary strong cell and successfully reside the secondary strong cell so as to prevent long-time network loss.

In the embodiment of the invention, a target frequency point with an energy value higher than a preset energy threshold value is determined from a frequency band which is supported by user equipment and comprises a plurality of frequency points, cell search is carried out on the target frequency point, whether a cell exists under the target frequency point is detected, the target frequency point is stored when the cell exists, so that all cells under the target frequency point are searched, and residence is initiated on all cells under the target frequency point in sequence, thereby avoiding the problem that when a strongest cell which does not have a history frequency point exists in the environment, the strongest cell cannot be searched when the strongest cell does not meet residence conditions, such as being set as access prohibition, and the like, but when a strongest cell which can be resided exists, the strongest cell cannot be searched, and network loss is caused for a long time.

Further, please refer to fig. 4, which is an interaction diagram of a cell search method according to an embodiment of the present invention. In the embodiment of the present invention, assuming that, in an environment, except for a serving cell, that is, a cell corresponding to a UE when the UE exits from the serving cell, there are a strongest cell set as forbidden access and a strongest cell capable of being accessed on a non-historical frequency point, the strongest cell can be searched through the embodiment of the present invention, and the strongest cell can be successfully camped on the strongest cell, which is described in detail below. Specifically, as shown in fig. 4, the cell search method according to the embodiment of the present invention may include the following steps:

201. and carrying out appointed frequency point search on each frequency point in the historical frequency point list in sequence.

202. Camping on a cell fails.

Specifically, when the energy of a serving cell is too low, or a scrambling code of the serving cell fails to be decoded, or a signal is not good due to being far away from a base station, and the like, which causes a radio link failure (radio link failure), the W access layer may issue a frequency point and a scrambling code of the serving cell to the W physical layer for candidate cell search, and if the search is successful, the searched cell is initiated to be resided; if the search fails, the UE can be determined to be out of the service area and reported. The W access layer represents an access layer (hereinafter, referred to as an "access layer") in the WCDMA system, and the W physical layer represents a physical layer (hereinafter, referred to as a "physical layer") in the WCDMA system.

After the UE is determined to be out of the service area, designated frequency point search can be initiated on each frequency point in the historical frequency point list, designated frequency point search can be initiated on the frequency point corresponding to the adjacent area of the service area, if a resident area is searched, the resident area is resided, otherwise, if the resident area is not searched, the full-band network search process is started.

203. And searching the network in full frequency band, and performing coarse scanning and fine scanning respectively.

204. And acquiring the target frequency point.

In the full-band network searching stage, a frequency point with an energy value higher than a preset energy threshold value can be determined from a plurality of frequency points included in a frequency band supported by the UE and serves as a target frequency point. Specifically, the UE may perform coarse scanning on a frequency band (band) supported by the UE, for example, RSSI scanning is performed on a part of frequency points of the band at intervals of 15 frequency points, the RSSI scanning also performs RSSI measurement on frequency points (the part of frequency points after the interval) in the band, and whether a WCDMA cell may exist on a searched frequency point is determined according to a level of an RSSI value obtained by the measurement. Generally, the higher the RSSI value, the more likely there is a cell on the frequency band. Therefore, one or more frequency points with the RSSI value higher than a preset energy threshold value, such as a preset RSSI threshold value, can be screened from bands supported by the UE according to the measured RSSI value. For the screened frequency points, n frequency points before and after the screened frequency points are taken (assuming that n is 7), and 15 frequency points are obtained in total in each group. Then, each group of 15 frequency points is subjected to fine scanning, that is, Physical Shared Channel (PSCH) scanning is performed on the 15 frequency points, a frequency point with the highest RSSI value is screened from the 15 frequency points, and the frequency point with the highest RSSI value is determined as a target frequency point.

205. And performing frequency point list search on the target frequency point.

206. And acquiring the strongest cell under the target frequency point.

207. And adding the target frequency point into a historical frequency point list and trying to reside in the strongest cell.

Further, after the target frequency point is obtained, a frequency point list search can be initiated for the target frequency point, and a strongest cell (a first cell) can be obtained on the frequency point. Specifically, the target frequency point may be subjected to timeslot synchronization and frame synchronization, and the scrambling code is searched in a preset scrambling code group, and finally, a cell with the strongest energy (e.g., the highest RSSI) on the target frequency point, that is, a strongest cell, is found, that is, a cell corresponding to the searched scrambling code. After finding the scrambling code, a common pilot channel (CPICH) is measured and reported. And adding the frequency point of the strongest cell, namely the target frequency point, into a historical frequency point list.

208. The strongest cell does not meet the residence condition and the residence fails.

After the strongest cell is obtained, the camping can be initiated to the strongest cell, at this time, the strongest cell is found not to satisfy the camping condition, if the cell is found to be Bar, that is, the strongest cell is set as forbidden access, and the camping of the strongest cell fails. When the UE fails to reside in the cell in the full-band network searching stage, that is, when trying to reside in all the solved strongest cells fails, the network system can be switched to search the cell, for example, the WCDMA is switched to the LTE or the GSM to search the network. If the cell which can reside is searched, the cell is resided, otherwise, if the cell which can reside is not searched, the first round of network searching is completed, and the second round of network searching is started. Optionally, the second round of network searching, that is, a new round of network searching process, may be initiated immediately after the first round of network searching fails, or initiated after a preset network re-searching condition is met, for example, after the network re-searching condition is backed off according to a backoff mechanism of a preset time, which is not limited in the embodiment of the present invention.

209. And carrying out appointed frequency point search on each frequency point in the historical frequency point list in sequence.

210. Two cells exist under one frequency point obtained by obtaining.

And if the first round of network searching is finished, the UE does not reside in any cell, performing a second round of network searching, and sequentially performing appointed frequency point searching on each frequency point in the historical frequency point list. It should be noted that the history frequency point list at this time includes the newly added target frequency point. Assuming that the searching result of the appointed frequency point of the target frequency point comprises a strongest cell and a second strongest cell;

211. attempting to camp on the strongest cell.

212. The strongest cell does not meet the residence condition and the residence fails.

213. Attempting to camp on the second strongest cell.

214. And if the residence is successful, the normal service is recovered.

Specifically, after the strongest cell and the second strongest cell are obtained through searching, the UE tries to camp on the strongest cell, finds that the strongest cell does not satisfy the camping condition, and if the camping fails, tries to camp on the second strongest cell, succeeds in camping, and resumes the normal service.

In the embodiment of the invention, the acquired available frequency point, namely the target frequency point, is added into the historical frequency point list, so that all cells under the frequency point can be searched and reside in the mode of searching the designated frequency point when the historical frequency point is searched next time. Therefore, the problem that the strongest cell with a non-historical frequency point in the environment cannot be resided due to the fact that the strongest cell is set to be forbidden to be accessed and the like, but the strongest cell cannot be searched when the strongest cell capable of being resided exists, and long-time network loss is caused is solved.

Fig. 5 is a schematic structural diagram of a cell search apparatus according to an embodiment of the present invention. Specifically, as shown in fig. 5, the cell search apparatus according to the embodiment of the present invention may include a frequency point determining unit 11, a searching unit 12, and a storage unit 13. Wherein,

the frequency point determining unit 11 is configured to determine a target frequency point from a frequency band supported by the user equipment.

The frequency band (band) supported by the User Equipment (UE) includes at least one frequency point (or referred to as "frequency band is divided into one or more frequency points"), the target frequency point is a frequency point in the at least one frequency point, where an energy value in the at least one frequency point is higher than a preset energy threshold, and the target frequency point may be one or more frequency points. Further, the first cell may refer to any cell under each target frequency point, such as a cell with the highest energy value (the strongest cell) under the target frequency point.

The searching unit 12 is configured to perform cell search for the target frequency point, and detect whether a first cell exists at the target frequency point according to a search result of the cell search.

Further, in some embodiments,

the searching unit 12 is further configured to, when it is detected that the connection state of the user equipment is in an out-of-service area, perform designated frequency point search on the frequency points in the historical frequency point list of the user equipment, and notify the frequency point determining unit 11 to determine a target frequency point from the frequency bands supported by the user equipment when the user equipment fails to reside in a cell after the designated frequency point search.

The frequency points in the history frequency point list may include frequency points of a cell in which the UE has successfully resided, that is, history frequency points, frequency points stored in the UE, frequency points of a neighboring cell of a resident cell, and the like, and may also include frequency points added by the technical scheme of the embodiment of the present invention before the network searching process.

The storage unit 13 is configured to store the target frequency point when the detection result of the search unit 12 indicates that the first cell exists, so as to initiate residence in all cells under the target frequency point in sequence.

Optionally, in some embodiments, the storage unit 13 may be specifically configured to:

Further, the cell search mode when performing cell search for the target frequency point may be frequency point list search, and the first cell is a cell (strongest cell) with the highest energy value at the target frequency point; the device may also comprise (not shown in the figures):

a camping unit 14, configured to initiate camping on the first cell;

the searching unit 12 is further configured to, when the user equipment fails to reside in the first cell, perform designated frequency point search on the frequency points in the historical frequency point list to which the target frequency point is added, and acquire all cells under the frequency points in the historical frequency point list;

the residence unit 14 is further configured to initiate residence for each cell under the frequency point in the historical frequency point list in sequence.

Further optionally, in some embodiments, the target frequency point may include a plurality of frequency points; the specific manner of initiating the camping by the camping unit 14 on the first cell may be:

Optionally, if only one target frequency point is detected, the camping unit 14 may determine that the user equipment unsuccessfully camps in the first cell when detecting that camping in the first cell fails.

Further, in some embodiments, the apparatus may further include:

a system obtaining unit 15, configured to obtain a network system supported by the user equipment when the user equipment fails to camp in the first cell;

the searching unit 12 is further configured to sequentially switch the current network standard to each network standard supported by the user equipment to perform cell search, and obtain a cell under the network standard;

the residence unit 14 is further configured to initiate residence to each acquired cell in the network standard in sequence, and notify the search unit 12 to perform designated frequency point search on the frequency points in the historical frequency point list to which the target frequency point is added when the obtained residence fails for all the cells in the network standard supported by the user equipment.

In a specific embodiment, if the UE fails to camp on the searched cell after switching the network modes, designated frequency point search is performed on all frequency points in the historical frequency point list to which the target frequency point is added in sequence, and a second round of network search is performed. Therefore, when a strongest cell under a certain frequency point in the environment is set as a secondary strong cell which can not be resided due to forbidden access, the embodiment of the invention can search the secondary strong cell and successfully reside the secondary strong cell so as to prevent long-time network loss.

Please refer to fig. 6, which is a schematic structural diagram of another ue according to an embodiment of the present invention, and specifically, as shown in fig. 6, the ue according to the embodiment of the present invention includes: a communication interface 300, a memory 200 and a baseband processor 100, wherein the baseband processor 100 is connected to the communication interface 300 and the memory 200 respectively. The memory 200 may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication interface 300, the memory 200 and the baseband processor 100 may be connected by a bus, or may be connected by other methods. In this embodiment, a bus connection is described. The communication interface 300 may include an antenna. The user equipment of the embodiment of the present invention may further include RFFE, RFIC, etc. in the above-mentioned RF (not shown in the figure). Specifically, the ue in the embodiment of the present invention may correspond to the ue in the embodiment corresponding to fig. 3 and fig. 4, and refer to the related description of the embodiment corresponding to fig. 3 or fig. 4. Wherein,

the memory 200 is used for storing driving software;

the baseband processor 100 reads the driver software from the memory 200 and executes under the action of the driver software:

determining a target frequency point from a frequency band supported by user equipment, wherein the frequency band comprises at least one frequency point, and the target frequency point is a frequency point of which the energy value in the at least one frequency point is higher than a preset energy threshold;

performing cell search on the target frequency point through the communication interface 300, and detecting whether a first cell exists under the target frequency point according to a search result of the cell search;

and if so, storing the target frequency point so as to sequentially initiate residence for all cells under the target frequency point.

Optionally, the baseband processor 100 reads the driver software from the memory 200 and executes the storing of the target frequency point under the action of the driver software, specifically executing the following steps:

adding the target frequency point to a historical frequency point list of the user equipment;

the cell searching mode can be frequency point list searching, and the first cell is the cell with the highest energy value under the target frequency point; the baseband processor 100 is further configured to perform the following steps:

initiating camping on the first cell;

if the user equipment fails to reside in the first cell, performing designated frequency point search on the frequency points in the historical frequency point list added with the target frequency point through the communication interface 300 to obtain all cells under the frequency points in the historical frequency point list;

and initiating residence to each cell under the frequency points in the historical frequency point list in sequence.

Optionally, the target frequency points include a plurality of frequency points; the baseband processor 100 reads the driver software from the memory 200 and executes the initiation of camping on the first cell under the action of the driver software, specifically executing the following steps:

Optionally, before the baseband processor 100 reads the driver software from the memory 200 and performs the designated frequency point search on the frequency points in the historical frequency point list to which the target frequency point is added under the action of the driver software, the following steps are further performed:

when the user equipment fails to reside in a first cell, acquiring a network type supported by the user equipment;

sequentially switching the current network standard to each network standard supported by the user equipment, and performing cell search through the communication interface 300 to obtain a cell under the network standard;

initiating residence to each cell under the obtained network system in sequence;

and if the obtained residence of all the cells under the network mode supported by the user equipment fails, executing the step of performing the designated frequency point search on the frequency points in the historical frequency point list added with the target frequency points.

Optionally, before the baseband processor 100 reads the driver software from the memory 200 and determines the target frequency point from the frequency band supported by the user equipment under the action of the driver software, the following steps are further performed:

when detecting that the connection state of the user equipment is in an out-of-service area, performing designated frequency point search on the frequency points in the historical frequency point list of the user equipment through the communication interface 300;

and if the user equipment fails to reside in the cell after the designated frequency point is searched, executing the step of determining the target frequency point from the frequency band supported by the user equipment.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to perform all or part of the above described functions. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of cell search, comprising:

cell search is carried out aiming at the target frequency point, and whether a first cell exists under the target frequency point is detected according to the search result of the cell search;

2. The method according to claim 1, wherein the storing the target frequency point comprises:

the cell searching mode is frequency point list searching, and the first cell is the cell with the highest energy value under the target frequency point; the method further comprises the following steps:

initiating camping on the first cell;

if the user equipment fails to reside in the first cell, performing designated frequency point search on the frequency points in the historical frequency point list added with the target frequency point to obtain all cells under the frequency points in the historical frequency point list;

3. The method according to claim 2, wherein the target frequency point comprises a plurality of; the initiating the camping on the first cell comprises:

4. The method according to claim 2, wherein before the designated frequency point search for the frequency points in the historical frequency point list to which the target frequency point is added, the method further comprises:

sequentially switching the current network system to each network system supported by the user equipment to search a cell to obtain a cell under the network system;

5. The method according to any of claims 1-4, wherein before determining the target frequency point from the frequency bands supported by the user equipment, the method further comprises:

when detecting that the connection state of the user equipment is in an out-of-service area, performing appointed frequency point search on the frequency points in the historical frequency point list of the user equipment;

6. A cell search apparatus, comprising:

the device comprises a frequency point determining unit, a processing unit and a processing unit, wherein the frequency point determining unit is used for determining a target frequency point from a frequency band supported by user equipment, the frequency band comprises at least one frequency point, and the target frequency point is a frequency point of which the energy value in the at least one frequency point is higher than a preset energy threshold;

7. The apparatus according to claim 6, wherein the storage unit is specifically configured to:

the cell searching mode is frequency point list searching, and the first cell is the cell with the highest energy value under the target frequency point; the device further comprises:

a camping unit, configured to initiate camping on the first cell;

8. The apparatus according to claim 7, wherein the target frequency point comprises a plurality of; the specific manner of initiating the camping by the camping unit to the first cell is as follows:

9. The apparatus of claim 7, further comprising:

the resident unit is further configured to initiate a resident on each acquired cell in the network system in sequence, and notify the search unit to perform designated frequency point search on the frequency points in the historical frequency point list to which the target frequency point is added when all the acquired cells in the network system supported by the user equipment fail to reside.

10. The apparatus according to any one of claims 6 to 9,

11. A user device, comprising: the device comprises a communication interface, a memory and a baseband processor, wherein the baseband processor is respectively connected with the communication interface and the memory; wherein,

the memory is used for storing driving software;

the baseband processor reads the driver software from the memory and executes under the action of the driver software:

cell search is carried out on the target frequency point through the communication interface, and whether a first cell exists under the target frequency point is detected according to a search result of the cell search;

12. The user equipment according to claim 11, wherein the baseband processor reads the driver software from the memory and executes the storing of the target frequency point under the action of the driver software, and specifically executes the following steps:

the cell searching mode is frequency point list searching, and the first cell is the cell with the highest energy value under the target frequency point; the baseband processor is further configured to perform the steps of:

initiating camping on the first cell;

if the user equipment fails to reside in the first cell, performing designated frequency point search on the frequency points in the historical frequency point list added with the target frequency point through the communication interface to obtain all cells under the frequency points in the historical frequency point list;

13. The user equipment according to claim 12, wherein the target frequency point comprises a plurality of; the baseband processor reads the driver software from the memory and executes the initiation of camping on the first cell under the action of the driver software, and specifically executes the following steps:

14. The user equipment according to claim 12, wherein the baseband processor reads the driver software from the memory and performs the following steps before performing the designated frequency point search on the frequency points in the historical frequency point list to which the target frequency point is added under the action of the driver software:

switching the current network system to each network system supported by the user equipment in sequence, and searching a cell through the communication interface to obtain a cell under the network system;

15. The user equipment according to any of claims 11-14, wherein the baseband processor is further configured to, before reading the driver software from the memory and executing the determining of the target frequency point from the frequency bands supported by the user equipment under the action of the driver software, perform the following steps:

when detecting that the connection state of the user equipment is in an out-of-service area, carrying out appointed frequency point search on the frequency points in the historical frequency point list of the user equipment through the communication interface;