CN117956532A

CN117956532A - Cell selection method, system, device, terminal equipment and storage medium

Info

Publication number: CN117956532A
Application number: CN202211292821.8A
Authority: CN
Inventors: 黄江涛
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2024-04-30

Abstract

The application is suitable for the technical field of communication and provides a cell selection method, a system, a device, terminal equipment and a storage medium. Searching a plurality of adjacent cells and acquiring communication information of the adjacent cells when the communication with the current cell accords with any preset fault condition; when any communication fault of the current cell (resident cell) occurs, the adjacent cell is searched immediately and the signal quality is analyzed when any communication fault of the channel access failure or the data retransmission failure occurs, and the adjacent cell with the signal quality superior to that of the current cell is selected to establish communication, so that the cell selection logic based on the S criterion is avoided being limited, the terminal equipment is resident in the cell with the communication fault, the flexibility of selecting the cell according to the signal quality is improved, and the communication quality and the communication stability are improved.

Description

Cell selection method, system, device, terminal equipment and storage medium

Technical Field

The present application belongs to the field of communication technologies, and in particular, to a cell selection method, system, device, terminal equipment, and storage medium.

Background

In a cellular mobile communication system (Cellular Mobile Communication System), the entire service area can be divided into a plurality of cells (cells), each Cell is provided with a base station or a part of antennas of the base station, and is responsible for mobile communication of the corresponding service area, the cells with a certain distance can use the same frequency band for communication, and the coverage area of the cells can be flexibly adjusted according to the number of users of the corresponding service area, so that compared with the traditional large-area mobile communication system, the frequency band utilization rate and networking flexibility are improved.

At present, when a terminal device selects a cell, the terminal device generally performs priority ranking on nearby cells according to a specified parameter (for example, S criteria reflecting signal strength, or network system of the cell, etc.), so that the terminal device connects and resides in a cell with the highest priority ranking. The limited capability of the specified parameters to reflect the actual signal quality leads to the fact that the highest priority ranking is obtained for the cells with poor actual signal quality due to the good specified parameters, so that the communication problems of network blocking, network disconnection or paging loss and the like occur in the terminal equipment, and the communication quality and the communication stability are affected.

Disclosure of Invention

In view of this, embodiments of the present application provide a cell selection method, system, device, terminal equipment, and storage medium, so as to solve the problems that in the existing cell selection method, cells with poor actual signal quality but with good specified parameters obtain the highest priority ordering, so that the terminal equipment has communication problems such as network blocking, network disconnection, or paging loss, and the like, and affects the communication quality and communication stability.

A first aspect of an embodiment of the present application provides a cell selection method, including:

Searching a plurality of adjacent cells when the communication with the current cell accords with any preset fault condition, and acquiring the communication information of the adjacent cells; the preset fault condition comprises a channel transmission fault, a channel access failure or a data retransmission failure;

signal quality detection is carried out according to the communication information of the plurality of adjacent cells, so that the signal quality scores of the plurality of adjacent cells are obtained;

When the signal quality score of any adjacent cell is larger than the signal quality score of the current cell, establishing communication with the corresponding adjacent cell;

and reestablishing communication with the current cell when the signal quality scores of the plurality of adjacent cells are not greater than the signal quality score of the current cell.

A first aspect of the embodiments of the present application provides a cell selection method, where when communications with a current cell meet any preset fault condition, a plurality of neighboring cells are searched, and communications information of the plurality of neighboring cells is obtained; the preset fault condition comprises channel transmission fault, channel access failure or data retransmission failure; signal quality detection is carried out according to the communication information of the plurality of adjacent cells, so that signal quality scores of the plurality of adjacent cells are obtained; when the signal quality score of any adjacent cell is larger than that of the current cell, establishing communication with the corresponding adjacent cell; when the signal quality scores of a plurality of adjacent cells are not greater than the signal quality score of the current cell, the communication with the current cell is reestablished, when the current cell (resident cell) has communication faults, the adjacent cells can be searched and analyzed in real time, the adjacent cells with the signal quality superior to the current cell are selected to establish communication, the cell selection logic limited by the specified parameters based on S criteria and the like is avoided, and the terminal equipment is resident in the cell with the communication faults, so that the flexibility of selecting the cell according to the signal quality is improved, and the communication quality and the communication stability are improved.

A second aspect of the embodiments of the present application provides a terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the cell selection method provided in the first aspect of the embodiments of the present application when the computer program is executed by the processor.

A third aspect of the embodiment of the present application provides a cell selection system, including the terminal device and the cellular communication device provided in the second aspect of the embodiment of the present application, where the cellular communication device includes a communication base station of a plurality of cells;

a communication base station for any cell, configured to:

establishing communication with corresponding terminal equipment based on the communication instruction;

And when receiving the search instruction, acquiring communication information of the adjacent cells.

A fourth aspect of an embodiment of the present application provides a cell selection apparatus, including:

The searching module is used for searching a plurality of adjacent cells and acquiring communication information of the adjacent cells when the communication with the current cell accords with any preset fault condition; the preset fault condition comprises a channel transmission fault, a channel access failure or a data retransmission failure;

the detection module is used for detecting signal quality according to the communication information of the plurality of adjacent cells to obtain the signal quality scores of the plurality of adjacent cells;

a reselection module, configured to establish communication with a corresponding neighboring cell when the signal quality score of any neighboring cell is greater than the signal quality score of the current cell;

And the recovery module is used for reestablishing communication with the current cell when the signal quality scores of the plurality of adjacent cells are not greater than the signal quality score of the current cell.

A fifth aspect of the embodiments of the present application provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the cell selection method provided by the first aspect of the embodiments of the present application.

It will be appreciated that the advantages of the second to fifth aspects may be found in the relevant description of the first aspect, and are not described here.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a logic diagram of a transition between RRC three states provided in an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

Fig. 3 is a schematic diagram of a first flow of a cell selection method according to an embodiment of the present application;

fig. 4 is a second flowchart of a cell selection method according to an embodiment of the present application;

fig. 5 is a schematic diagram of a scenario of a cell selection system according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a cell selection apparatus according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".

Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

In the following, some terms used in the present application are explained for easy understanding by those skilled in the art.

1. Radio resource control (Radio Resource Control, RRC) state of terminal device

In application, in New Radio (NR), the RRC state of the terminal device includes a Connected state (RRC Connected), an inactive state/tristate (RRC INACTIVE), and an Idle state (RRC Idle), where when the terminal device is in the RRC Connected state, the terminal device, the network device, and the core network have established links, and when data arrives at the network, the data can be directly transmitted to the terminal device; when the terminal equipment is in an RRC inactive state, the link is established with the network equipment and the core network before the terminal equipment, but the link from the terminal equipment to the network equipment is released, the network equipment stores the context of the terminal equipment although the link is released, and when data needs to be transmitted, the network equipment can recover the link in time; when the terminal equipment is in the RRC idle state, no link exists among the terminal equipment, the network equipment and the core network, and when data needs to be transmitted, the link from the terminal equipment to the network equipment and the core network needs to be established.

Fig. 1 is a schematic diagram schematically illustrating a transition between three RRC states.

Wherein the network device may be an access network device. An access network device is an entity in the network side for transmitting or receiving signals, such as a new generation base station (Generation Node B, gNodeB). The access network device may be a device for communicating with a mobile device. The Access network device may be an Access Point (AP) in a wireless local area network (Wireless Local Area Networks, WLAN), an evolved base station (Evolutional Node B, eNodeB) in long term evolution (Long Term Evolution, LTE), or a relay station or Access Point or Access Backhaul (IAB), or an Access network device in a vehicle device, a wearable device, and a 5G network, or an Access network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN) network, or a gNB in an NR system, etc. In addition, in the embodiment of the present application, the access network device provides services for the cell, and the terminal device communicates with the access network device through transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell.

In application, the cell selection method provided by the embodiment of the application can be applied to the terminal equipment in the RRC connection state. The cell selection method provided by the embodiment of the application can be realized based on the communication between the terminal equipment and the network equipment of the current cell and the communication between the terminal equipment and the network equipment of the adjacent cell.

2. Existing cell selection schemes

In application, a cell, also referred to as a cell, refers to an area covered by one of the base stations or a part of the base stations (sector antennas) in a cellular mobile communication system, in which the core network can reliably communicate with the base stations through radio channels.

In application, when the terminal device is turned on or a radio link failure (Radio Link failure, RLF) occurs, the terminal device will execute a Cell search process, and select a Suitable Cell (useable Cell) to reside as soon as possible, this process is called Cell selection, and at present, when Cell selection is performed, the S criterion needs to be satisfied:

Wherein, the provision of the S criterion is as follows: if the S value of the cell is greater than 0, the cell is indicated to be a proper cell, wherein the S value of the cell is Srxlev of the cell, and a calculation method of the Srxlev is briefly described below;

Srxlev＝Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation-Qoffsettem p；

Wherein:

Srxlev refers to the level value (dB) calculated in cell selection;

Qrxlevmeas refers to a received signal strength value measured by the terminal device, which is a measured reference signal received Power (REFERENCE SIGNAL RECEIVED Power, RSRP) (dBm);

Qrxlevmin refers to the minimum received signal strength value required by the cell, which can be indicated by system message block 1 (System Information Block, sib1);

Pcompensation is max (PEMAX-PUMAX, 0) (dB), where PEMAX is the maximum allowed transmit power set by the system when the terminal device accesses the cell; PUMAX refers to maximum output power specified according to the terminal equipment class;

QrxlevminOffset is effective only when normally residing in a VPLMN, periodically searching a PLMN with high priority for cell selection evaluation, and carrying out certain bias on Qrxlevmin by the parameter;

Qoffsettemp is the offset value.

For Srxlev see in particular the relevant description in section 5.2.3.2 of TS38.304 of the 3GPP protocol, which is not explained here.

In the application, the terminal equipment can sort according to the S values of the cells, select the cell with the highest S value to establish communication, and complete cell selection.

In the application, in the current cell selection scheme, when the S value of the cell is greater than 0, the cells can be further ordered according to the network system of the cell, and specifically, when the S values of the two cells are the same, the cells with higher network systems can be preferentially selected. For example, the S values of the two cells are both 5, the network system of the first cell is 4G, and the network system of the second cell is 5G, and the second cell is preferentially selected to establish communication.

In application, when a terminal device selects a cell, the terminal device usually prioritizes nearby cells according to a specified parameter (for example, an S value calculated based on an S criterion reflecting signal strength, or a network system of the cell, etc.), so that the terminal device connects and resides in a cell with the highest priority. The limited capability of the specified parameters to reflect the actual signal quality leads to the fact that the highest priority ranking is obtained for the cells with poor actual signal quality due to the good specified parameters, so that the communication problems of network blocking, network disconnection or paging loss and the like occur in the terminal equipment, and the communication quality and the communication stability are affected.

In view of the above technical problems, an embodiment of the present application provides a cell selection method, which searches a plurality of neighboring cells and obtains communication information of the plurality of neighboring cells when communication with a current cell accords with any preset fault condition; the preset fault condition comprises channel transmission fault, channel access failure or data retransmission failure; signal quality detection is carried out according to the communication information of the plurality of adjacent cells, so that signal quality scores of the plurality of adjacent cells are obtained; when the signal quality score of any adjacent cell is larger than that of the current cell, establishing communication with the corresponding adjacent cell; when the signal quality scores of a plurality of adjacent cells are not greater than the signal quality score of the current cell, the communication with the current cell is reestablished, when the current cell (resident cell) has communication faults, the adjacent cells can be searched and analyzed in real time, the adjacent cells with the signal quality superior to the current cell are selected to establish communication, the cell selection logic limited by the specified parameters based on S criteria and the like is avoided, and the terminal equipment is resident in the cell with the communication faults, so that the flexibility of selecting the cell according to the signal quality is improved, and the communication quality and the communication stability are improved.

The cell selection method provided by the embodiment of the application can be applied to the terminal equipment. The terminal device may be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, an Ultra-Mobile Personal Computer (UMPC), a netbook, a Personal digital assistant (Personal DIGITAL ASSISTANT, PDA), or the like. The embodiment of the application does not limit the specific type of the terminal equipment.

Fig. 2 exemplarily shows a schematic structure of the terminal device 100, and the terminal device 100 includes a processor 10, a memory 20, an audio module 30, a camera module 40, a sensor module 50, an input module 60, a display module 70, a wireless communication module 80, a power module 90, and the like. The audio module 30 may include a speaker 31, a microphone 32, and the like, the camera module 40 may include a short-focus camera 41, a long-focus camera 42, a flash 43, and the like, the sensor module 50 may include an infrared sensor 51, an acceleration sensor 52, a position sensor 53, a fingerprint sensor 54, an iris sensor 55, and the like, the input module 60 may include a touch panel 61, an external input unit 62, and the like, and the Wireless Communication module 80 may include Wireless Communication units such as bluetooth, optical Wireless Communication (Optical Wireless), mobile Communication (Mobile Communications), wireless local area network (Wireless Local Area Network, WLAN), near Field Communication (NFC), and ZigBee (ZigBee).

In Application, the Processor 10 may be a central processing unit (Central Processing Unit, CPU), which may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSPs), application SPECIFIC INTEGRATED Circuits (ASICs), off-the-shelf Programmable gate arrays (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In applications, the memory 20 may in some embodiments be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory 20 may also be an external storage device of the terminal device in other embodiments, such as a plug-in hard disk provided on the terminal device, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD), etc. Further, the memory 20 may also include both an internal storage unit of the terminal device and an external storage device. The memory 20 is used for storing a computer program 21 such as an operating system, an application program, a boot loader (BootLoader), and the like. The memory 20 may also be used to temporarily store data that has been output or is to be output.

In application, the display module 70 may be a straight screen, a curved screen, or a flexible screen, and in particular may be a folded screen, where the folded screen may include at least one flexible screen, or the folded screen may include at least one flexible screen and at least one straight screen or curved screen, and the embodiment of the present application does not limit the specific type of the display module 70.

It is to be understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the terminal device 100. In other embodiments of the application, terminal device 100 may include more or less components than shown, or may combine some components, or different components, such as may also include a graphics processor, etc. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

As shown in fig. 3, the cell selection method provided by the embodiment of the present application includes the following steps S301 to S304:

Step S301, searching a plurality of adjacent cells and acquiring communication information of the adjacent cells when the communication with the current cell accords with any preset fault condition; the preset fault condition includes channel transmission failure, channel access failure or data retransmission failure.

In the application, the terminal device may preset a plurality of preset fault conditions, which may specifically include channel transmission failure, channel access failure or data retransmission failure, etc. After establishing communication with the current cell, the communication condition with the current cell can be monitored in real time; when meeting any preset fault condition, executing adjacent cell search, wherein the adjacent cell search can be executed by the terminal equipment or the current cell; the terminal device may receive and record communication information of the neighboring cells for establishing communication with the neighboring cells or detecting signal quality.

In one embodiment, the searching for a plurality of neighboring cells includes:

Searching to obtain a plurality of adjacent cells according to preset searching conditions; the preset search condition comprises that the distance between the adjacent cell and the current cell is not larger than a preset distance; or the distance between the adjacent cell and the terminal equipment is not more than a preset distance; or the number of cells at intervals between the adjacent cells and the current cell is not more than a preset number; or the adjacent cell is positioned in the signal coverage range of the current cell; or the terminal device is located within the signal coverage of a neighboring cell.

In the application, the terminal device may preset a plurality of preset search conditions, and search through at least one preset search condition to obtain a plurality of neighboring cells. The preset search condition may be applied to when the terminal device performs neighbor cell search, or may be applied to when neighbor cell search is performed through the current cell. Specifically, when the terminal device performs the neighbor cell search, the preset search condition may include: the distance between the adjacent cell and the terminal equipment is not more than a preset distance; the terminal device is located within signal coverage of a neighboring cell. When performing neighbor cell search through the current cell, the preset search conditions may include: the preset search condition comprises that the distance between the adjacent cell and the current cell is not larger than a preset distance; the number of cells at intervals between the adjacent cells and the current cell is not greater than a preset number; the neighboring cell is located within the signal coverage of the current cell. The preset distance can be set according to the actual communication capability of the terminal equipment and the cell, and the specific setting of the preset search condition is not limited in the embodiment of the application.

In application, the search of the adjacent cells is performed by setting preset search conditions, so that the adjacent cells and the terminal equipment are respectively positioned in the communication range of each other, and the adjacent cells and the terminal equipment are ensured to have better signal strength when in communication, so that the communication quality between the terminal equipment and the adjacent cells is ensured.

Step S302, signal quality detection is carried out according to the communication information of the plurality of adjacent cells, and the signal quality scores of the plurality of adjacent cells are obtained.

In the application, the communication information of the neighboring cell may specifically include location information of the network device, software information of the network device, hardware information of the network device, and the like. For any one neighboring cell, after obtaining the communication information of the corresponding neighboring cell, the terminal device may obtain the reference signal (REFERENCE SIGNAL, RS) according to the communication information of the neighboring cell and perform signal quality detection to obtain the signal quality score of the neighboring cell. The difference from the S criterion is that the S criterion is used for measuring the signal strength of the cell signal received by the terminal device, and the signal quality score is used for measuring the communication quality and the communication stability of the cell signal received by the terminal device, and the method for calculating the signal quality score is described below.

In one embodiment, step S302 includes:

Signal quality detection is carried out according to the communication information of the plurality of adjacent cells, and reference signal measurement values of the plurality of adjacent cells are obtained;

the signal quality score of each adjacent cell is calculated according to the reference signal measured value of the corresponding adjacent cell.

In application, for any one neighboring cell, after the terminal device acquires the reference signal according to the communication information of the corresponding neighboring cell and performs signal quality detection, a reference signal measurement value can be obtained to calculate the signal quality score of the corresponding neighboring cell.

Specifically, the reference signal measurement value may include at least one of reference signal received Power (REFERENCE SIGNAL RECEIVING Power, RSRP), reference signal received Quality (REFERENCE SIGNAL RECEIVING Quality, RSRQ), and reference signal to noise ratio (Signal to Interference plus Noise Ratio, SINR). For example, the reference signal measurement may include only RSRQ, at which point quality=f _RSRQ;

The reference signal measurements may also include RSRQ and SINR, where quality=f _RSRQ*β₁+F_SINR*β₂;

The reference signal measurements may also include RSRP, RSRQ, and SINR, where quality=f _RSRQ*β₁+F_SINR*β₂+F_RSRP*β₃;

Wherein Quality represents a signal Quality score, F _RSRQ represents a reference signal reception Quality value, β ₁ represents a calculation coefficient of a reference signal reception Quality, F _SINR represents a reference signal-to-noise value, β ₂ represents a calculation coefficient of a reference signal-to-noise ratio, F _RSRP represents a reference signal reception power value, and β ₃ represents a calculation coefficient of a reference signal reception power. The sizes of β ₁、β₂ and β ₃ may be set according to actual needs, specifically, β ₁ may be greater than β ₂,β₂ and may be greater than β ₃, so that weights of RSRP, SINR and RSRQ when calculating the signal quality score are sequentially increased, where RSRP may reflect signal strength of the reference signal, SINR may reflect communication stability of the reference signal, and RSRQ may reflect communication quality of the reference signal, so that the signal quality score may more accurately reflect communication quality and communication stability of the neighboring cell.

Step S303, when the signal quality score of any adjacent cell is larger than the signal quality score of the current cell, communication is established with the corresponding adjacent cell.

In application, the method for acquiring the reference signal or the signal quality score according to the signal obtained during communication after the terminal device establishes the RRC connection state with the current cell may refer to the related description in step S302, which is not described herein.

In the application, whether to perform cell reselection can be determined according to the signal quality scores of a plurality of adjacent cells and the signal quality score of the current cell. Specifically, if the signal quality scores of the plurality of neighboring cells are not greater than the signal quality score of the current cell, step S304 is entered to reconstruct communication with the current cell; if the signal quality score of any adjacent cell is larger than the signal quality score of the current cell, communication is established with any adjacent cell.

In the application, after determining that the cell reselection is required, the reselection cell may be further obtained according to the signal quality scores of the plurality of neighboring cells, where the reselection cell may be a neighboring cell with the highest signal quality score and the signal quality score is greater than the signal quality score of the current cell, and communication is established with the reselection cell, so that the terminal device establishes communication with the neighboring cell with the best signal quality.

Step S304, reestablishing communication with the current cell when the signal quality scores of the plurality of adjacent cells are not greater than the signal quality score of the current cell.

In an application, when the signal quality of a plurality of neighboring cells is not better than the current cell, communication with the current cell may be reestablished. Specifically, the communication with the current cell can be reestablished through the first reestablishment logic, firstly, the RRC connection state of the terminal equipment is released, the RRC non-activated state is entered, the links of the terminal equipment and the network equipment are released, and then the RRC non-activated state is restored to the RRC connection state, so that the links of the terminal equipment and the network equipment are restored; and the communication with the current cell can be reestablished through the second reestablishment logic, firstly, the RRC connection state of the terminal equipment is released and enters an RRC idle state to interrupt the link among the terminal equipment, the network equipment and the core network, and then the RRC connection state is established from the RRC idle state to reestablish the link among the terminal equipment, the network equipment and the core network so as to attempt to repair the preset fault condition.

In the application, when reestablishing communication with the current cell, firstly establishing communication with the current cell according to the first reestablishment logic, and if the reestablished communication with the current cell does not accord with the preset fault condition, continuing to communicate with the current cell; if the communication with the current cell after the reconstruction still accords with the preset fault condition, establishing the communication with the current cell according to the second reconstruction logic.

In application, searching a plurality of adjacent cells and acquiring communication information of the adjacent cells when the communication with the current cell accords with any preset fault condition; the preset fault condition comprises channel transmission fault, channel access failure or data retransmission failure; signal quality detection is carried out according to the communication information of the plurality of adjacent cells, so that signal quality scores of the plurality of adjacent cells are obtained; when the signal quality score of any adjacent cell is larger than that of the current cell, establishing communication with the corresponding adjacent cell; when the signal quality scores of a plurality of adjacent cells are not greater than the signal quality score of the current cell, the communication with the current cell is reestablished, when the current cell (resident cell) has communication faults, the adjacent cells can be searched and analyzed in real time, the adjacent cells with the signal quality superior to the current cell are selected to establish communication, the cell selection logic limited by the specified parameters based on S criteria and the like is avoided, and the terminal equipment is resident in the cell with the communication faults, so that the flexibility of selecting the cell according to the signal quality is improved, and the communication quality and the communication stability are improved.

As shown in fig. 4, in one embodiment, based on the embodiment corresponding to fig. 3, the following steps S401 to S407 are included:

In application, a specific determination method of the preset failure condition is explained below based on steps S401 to S403.

Step S401, when the number of times of generating the step-out signal is monitored to be greater than the first preset number of times, a first fault signal is generated to represent that a channel transmission fault occurs, and step S404 is entered.

In the application, after the terminal device and the current cell establish the RRC connection state, whether to generate the out-of-step signal may be determined according to the error rate of the downlink message sent by the current cell, specifically, after decoding the downlink message sent by the current cell, if the error rate is greater than a preset error rate, the out-of-step signal is generated. The error rate can be set according to actual needs, and specifically can be 10%, 20% and the like.

In the application, the terminal device may monitor whether the number of times of generation of the out-of-step signal is greater than a first preset number of times, and the specific monitoring method may include: monitoring whether the generation times of the step-out signals are larger than the first preset times or not in the preset time; or whether the number of times of monitoring the continuous generation of the Out-of-step signal is greater than the first preset number of times or not can be specifically achieved by judging whether a T310 timer is triggered, wherein the T310 timer is triggered after an upper protocol layer of the terminal device continuously receives N310 Out-of-step (Out of Sync) signals of a lower layer, N310 can be configured according to actual needs, for example, N310 can be configured as 4, 5 or 6, and the like, and if N310 is configured as 4 (the first preset number of times is 4), the terminal device starts the T310 timer after continuously monitoring the generation of the Out-of-step signal for 4 times. The specific numerical value of the first preset times is not limited in the embodiment of the application.

Step S402, when the failure times of the access channel is monitored to be larger than the second preset times, a second failure signal is generated to represent that the channel access failure occurs, and step S404 is entered.

In the application, the terminal device may monitor the number of failures of the access channel, or may monitor the number of failures of the Random access channel (Random ACCESS CHANNEL, RACH), where if the Random access channel is successful, it indicates that the terminal device has successfully accessed the channel, and if the RACH is performed multiple times, it indicates that the terminal device has not successfully accessed the channel, so the number of failures of the access channel may be equivalent to the number of failures of the access channel. And when the number of times of channel access failure or the number of times of RACH execution is larger than a second preset number of times, generating a second fault signal to represent that channel access failure occurs. The specific numerical value of the second preset times is not limited in the embodiment of the application.

Step S403, when the number of times of data retransmission is monitored to be greater than the third preset number of times, a third fault signal is generated to indicate that data retransmission failure occurs, and step S404 is entered.

In the application, the terminal device may monitor the number of times of performing data retransmission, specifically may be based on the number of times of performing retransmission by using a radio link control protocol (Radio Link Control, RLC), and when the number of times of performing data retransmission is greater than a third preset number of times, for example, if the third preset number of times is 4, if the terminal device uploads the same data packet for 4 times to the network device of the current cell, the network device of the current cell does not return data during the period, which indicates that the communication between the terminal device and the network device of the current cell is abnormal, the terminal device generates a third fault signal to indicate that data retransmission failure occurs. The specific numerical value of the third preset times is not limited in the embodiment of the application.

Step S404, searching a plurality of adjacent cells and acquiring communication information of the adjacent cells when the communication with the current cell accords with any preset fault condition; the preset fault condition comprises channel transmission fault, channel access failure or data retransmission failure;

step S405, signal quality detection is carried out according to the communication information of a plurality of adjacent cells, so as to obtain the signal quality scores of the adjacent cells;

Step S406, when the signal quality score of any adjacent cell is larger than the signal quality score of the current cell, establishing communication with the corresponding adjacent cell;

Step S407, reestablishing communication with the current cell when the signal quality scores of the plurality of adjacent cells are not greater than the signal quality score of the current cell.

In application, the cell selection method provided in step S404 to step S407 may refer to the description related to step S301 to step S304, and will not be described herein.

In the application, whether the communication with the current cell has a fault or not is determined by judging whether the terminal equipment has a channel transmission fault, a channel access failure or a data retransmission failure, so that the flexibility and the accuracy of judging the communication fault are improved, and the accuracy of judging whether the terminal equipment reselects the cell is improved.

It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.

As shown in fig. 5, a cell selection system 200 provided by an embodiment of the present application includes a terminal device 100 and a cellular communication device 210 provided by the foregoing embodiments, where the cellular communication device 210 includes a network device 212 with a plurality of cells 211;

a network device 212 for any cell 211 for:

establishing communication with the corresponding terminal device 100 based on the communication instruction;

It should be noted that, for simplicity of illustration, fig. 5 only illustrates that the network device 212 is configured in three cells 211, and in the actual cellular communication device 210, each cell 211 is configured with the network device 212 or a portion of the antennas of the network device 212.

In application, the terminal device is configured to execute the steps in the above embodiment of the cell selection method, which is not described herein. For the network device 212 of any cell 211, communication can be established with the corresponding terminal device 100 upon receiving a communication instruction of the terminal device 100; when a search instruction of the terminal device 100 is received, the search of the neighboring cell may be performed according to a preset search condition, and communication information of the neighboring cell may be obtained, and a specific search method may refer to the related description in the above method embodiment, which is not described herein.

As shown in fig. 6, the embodiment of the present application further provides a cell selection apparatus, configured to perform the steps in the embodiment of the cell selection method applied to the terminal device. The cell selection means may be virtual means (virtual appliance) in the terminal device, which are executed by a processor of the terminal device, or the terminal device itself.

As shown in fig. 6, a cell selection apparatus 300 provided in an embodiment of the present application includes:

A searching module 310, configured to search a plurality of neighboring cells and obtain communication information of the plurality of neighboring cells when communication with the current cell meets any preset fault condition; the preset fault condition comprises channel transmission fault, channel access failure or data retransmission failure;

A detection module 320, configured to perform signal quality detection according to the communication information of the plurality of neighboring cells, so as to obtain signal quality scores of the plurality of neighboring cells;

a reselection module 330, configured to establish communication with a corresponding neighboring cell when the signal quality score of any neighboring cell is greater than the signal quality score of the current cell;

a recovery module 340, configured to reestablish communication with the current cell when the signal quality scores of the plurality of neighboring cells are not greater than the signal quality score of the current cell.

In one embodiment, the cell selection apparatus 300 further comprises:

the monitoring module is used for generating a first fault signal when monitoring that the number of times of generating the step-out signal is larger than a first preset number of times so as to represent that a channel transmission fault occurs;

Generating a second fault signal to represent that the channel access failure occurs when the failure times of the access channel are monitored to be larger than the second preset times;

And when the times of data retransmission is monitored to be larger than the third preset times, generating a third fault signal to represent that data retransmission failure occurs.

In one embodiment, the search module 310 further includes:

The preset searching unit is used for searching to obtain a plurality of adjacent cells according to preset searching conditions; the preset search condition comprises that the distance between the adjacent cell and the current cell is not larger than a preset distance; or the distance between the adjacent cell and the terminal equipment is not more than a preset distance; or the number of cells at intervals between the adjacent cells and the current cell is not more than a preset number; or the adjacent cell is positioned in the signal coverage range of the current cell; or the terminal device is located within the signal coverage of a neighboring cell.

In one embodiment, the detection module 320 further includes:

The computing unit is used for detecting signal quality according to the communication information of the plurality of adjacent cells and acquiring reference signal measured values of the plurality of adjacent cells;

In one embodiment, the reselection module 330 further includes:

The screening unit is used for acquiring the reselected cell according to the signal quality scores of the plurality of adjacent cells and establishing communication with the reselected cell; the reselection cell is the adjacent cell with the highest signal quality score among the plurality of adjacent cells, and the signal quality score of the reselection cell is larger than that of the current cell.

In application, each module in the cell selection device may be a software program module, may be implemented by different logic circuits integrated in a processor, or may be implemented by a plurality of distributed processors.

It should be noted that, because the content of information interaction and execution process between the modules is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be specifically referred to the cell selection method embodiment section, and will not be described herein again.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be performed by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to perform all or part of the functions described above. The functional modules in the embodiment may be integrated in one processing module, or each module may exist alone physically, or two or more modules may be integrated in one module, where the integrated modules may be implemented in a form of hardware or a form of software functional modules. In addition, the specific names of the functional modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the modules in the above system may refer to the corresponding process in the foregoing embodiment of the cell selection method, which is not described herein again.

Embodiments of the present application also provide a computer readable storage medium storing a computer program which, when executed by a processor, implements steps for implementing the above-described embodiments of the cell selection method.

The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable storage medium may include at least: any entity or device capable of carrying computer program code to a photo terminal equipment, a recording medium, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Such as a U-disk, removable hard disk, magnetic or optical disk, etc.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments provided in the present application, it should be understood that the disclosed terminal device and method may be implemented in other manners. For example, the above-described embodiments of the terminal device are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be other manners of division in actual implementation, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or modules, which may be in electrical, mechanical or other forms.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A method of cell selection, comprising:

2. The cell selection method of claim 1, wherein the method further comprises:

Generating a first fault signal to represent the occurrence of channel transmission faults when the times of generating the step-out signal is monitored to be larger than a first preset times;

3. The cell selection method of claim 1, wherein the searching for a plurality of neighboring cells comprises:

Searching to obtain a plurality of adjacent cells according to preset searching conditions; the preset search condition comprises that the distance between the adjacent cell and the current cell is not larger than a preset distance; or the distance between the adjacent cell and the terminal equipment is not more than a preset distance; or the number of cells of the interval between the adjacent cell and the current cell is not more than a preset number; or the adjacent cell is positioned in the signal coverage range of the current cell; or the terminal equipment is located in the signal coverage range of the adjacent cell.

4. The cell selection method as claimed in claim 1, wherein said performing signal quality detection based on the communication information of the plurality of neighboring cells to obtain signal quality scores of the plurality of neighboring cells comprises:

5. The cell selection method of claim 4, wherein the reference signal measurement comprises at least one of a reference signal received power, a reference signal received quality, and a reference signal to noise ratio.

6. A cell selection method according to any one of claims 1 to 5, wherein said establishing communication with a respective neighboring cell when the signal quality score of any neighboring cell is greater than the signal quality score of the current cell comprises:

Acquiring a reselection cell according to the signal quality scores of the plurality of adjacent cells, and establishing communication with the reselection cell; the reselection cell is the neighboring cell with the highest signal quality score among the neighboring cells, and the signal quality score of the reselection cell is greater than the signal quality score of the current cell.

7. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the cell selection method according to any of claims 1 to 6 when the computer program is executed.

8. A cell selection system comprising a terminal device according to claim 7 and a cellular communication device comprising a network device of a plurality of cells;

A network device for any cell, for:

9. A cell selection apparatus, comprising:

10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the cell selection method according to any of claims 1 to 6.