CN106507418B - Cell reselection method and device based on signal strength and mobile terminal - Google Patents
Cell reselection method and device based on signal strength and mobile terminal Download PDFInfo
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- CN106507418B CN106507418B CN201610927711.2A CN201610927711A CN106507418B CN 106507418 B CN106507418 B CN 106507418B CN 201610927711 A CN201610927711 A CN 201610927711A CN 106507418 B CN106507418 B CN 106507418B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
Abstract
The invention discloses a cell reselection method, a cell reselection device and a mobile terminal based on signal strength, and relates to the technical field of communication, wherein the method comprises the following steps: acquiring reference signal receiving power of a target cell; calculating a cell reselection characteristic value according to the reference signal receiving power; judging whether the cell reselection characteristic value is larger than a reselection threshold value of the target cell, if so, performing cell reselection, and enabling the mobile terminal to enter the target cell from the current cell; when the cell reselection characteristic value is smaller than the reselection threshold value, judging whether the cell reselection characteristic value is larger than zero; if so, judging whether the reference signal receiving power is larger than a preset signal strength threshold value, if so, performing cell reselection, and enabling the mobile terminal to enter the target cell from the current cell, so that the cell reselection can be performed quickly, and the user experience is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a cell reselection method and apparatus based on signal strength, and a mobile terminal.
Background
In daily life, when people carry the mobile phone to enter a place where network signals are not good, the signal strength of the mobile phone is weakened, the mobile phone is often lowered from a 4G network to a 3G network or a 2G network, even no signal is available, the mobile phone cannot be connected to the internet, but when people return to an area with good network signals, the mobile phone signals are often difficult to return to the best network immediately, the mobile phone has to be restarted to obtain the best network sometimes, and inconvenience is brought to people.
Disclosure of Invention
The invention mainly aims to provide a cell reselection method and device based on signal strength and a mobile terminal, which can quickly reselect a cell and improve user experience.
In order to achieve the above object, the present invention provides a cell reselection method based on signal strength, including:
acquiring reference signal receiving power of a target cell;
calculating a cell reselection characteristic value according to the reference signal receiving power;
judging whether the cell reselection characteristic value is larger than a reselection threshold value of the target cell, if so, performing cell reselection, and enabling the mobile terminal to enter the target cell from the current cell;
when the cell reselection characteristic value is smaller than the reselection threshold value, judging whether the cell reselection characteristic value is larger than zero;
if so, judging whether the reference signal receiving power is larger than a preset signal strength threshold value, if so, reselecting the cell, and enabling the mobile terminal to enter the target cell from the current cell.
Optionally, the signal quality of the target cell is better than the signal quality of the current cell.
Optionally, after determining whether the cell reselection characteristic value is greater than zero, the method further includes:
and if the cell reselection characteristic value is not greater than zero, entering a neighboring cell with the signal quality inferior to that of the current cell or not providing network service.
Optionally, calculating the cell reselection characteristic value according to the reference signal received power specifically includes:
calculating a cell reselection characteristic value according to the following formula:
Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)-Pcompensation
wherein Srxlex is a cell reselection characteristic value;
qrxlevmeas is the reference signal receiving power of the target cell, and the unit is dBm;
qrxlevmin is the minimum receiving intensity requirement of the reference signal receiving power in the target cell, and is automatically obtained by the mobile terminal in unit dBm;
qrxlevminoffset is a preset offset;
Pcompensation＝Max(PEMAX–PUMAX，0)；
the PEMAX is the maximum uplink transmission power allowed by the terminal in the target cell, and the unit is dBm and is automatically obtained by the mobile terminal;
PUMAX is the maximum uplink transmit power determined by the terminal capability, in dBm.
As another aspect of the present invention, there is provided a cell reselection apparatus based on signal strength, including:
an obtaining module, configured to obtain a reference signal received power of a target cell;
the calculating module is used for calculating a cell reselection characteristic value according to the reference signal receiving power;
a first judging module, configured to judge whether the cell reselection characteristic value is greater than a reselection threshold of the target cell, if so, perform cell reselection, and enable the mobile terminal to enter the target cell from a current cell;
the second judging module is used for judging whether the cell reselection characteristic value is larger than zero or not when the cell reselection characteristic value is smaller than the reselection threshold value;
a third judging module, configured to, when the cell reselection characteristic value is greater than zero, judge whether the reference signal received power is greater than a preset signal strength threshold, if yes, perform cell reselection, and enter the target cell from the current cell by the mobile terminal;
and the first cell reselection module is used for reselecting the cell, and the mobile terminal enters the target cell from the current cell.
Optionally, the signal quality of the target cell is better than the signal quality of the current cell.
Optionally, the method further comprises:
and the second cell reselection module is used for entering an adjacent cell with the signal quality inferior to that of the current cell or not providing network service if the cell reselection characteristic value is not greater than zero.
Optionally, the calculation method of the calculation module is:
calculating a cell reselection characteristic value according to the following formula:
Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)-Pcompensation
wherein Srxlex is a cell reselection characteristic value;
qrxlevmeas is the reference signal receiving power of the target cell, and the unit is dBm;
qrxlevmin is the minimum receiving intensity requirement of the reference signal receiving power in the target cell, and is automatically obtained by the mobile terminal in unit dBm;
qrxlevminoffset is a preset offset;
Pcompensation＝Max(PEMAX–PUMAX，0)；
the PEMAX is the maximum uplink transmission power allowed by the terminal in the target cell, and the unit is dBm and is automatically obtained by the mobile terminal;
PUMAX is the maximum uplink transmit power determined by the terminal capability, in dBm.
As another aspect of the present invention, there is provided a mobile terminal including the above-mentioned apparatus.
The invention provides a cell reselection method, a cell reselection device and a mobile terminal based on signal strength, wherein the method comprises the following steps: acquiring reference signal receiving power of a target cell; calculating a cell reselection characteristic value according to the reference signal receiving power; judging whether the cell reselection characteristic value is larger than a reselection threshold value of the target cell, if so, performing cell reselection, and enabling the mobile terminal to enter the target cell from the current cell; when the cell reselection characteristic value is smaller than the reselection threshold value, judging whether the cell reselection characteristic value is larger than zero; if so, judging whether the reference signal receiving power is larger than a preset signal strength threshold value, if so, performing cell reselection, and enabling the mobile terminal to enter the target cell from the current cell, so that the cell reselection can be performed quickly, and the user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a hardware structure of a mobile terminal implementing various embodiments of the present invention;
FIG. 2 is a diagram of a wireless communication system for the mobile terminal shown in FIG. 1;
fig. 3 is a flowchart of a cell reselection method based on signal strength according to an embodiment of the present invention;
fig. 4 is a block diagram illustrating an exemplary structure of a cell reselection apparatus based on signal strength according to a second embodiment of the present invention;
fig. 5 is a block diagram illustrating an exemplary structure of another cell reselection device based on signal strength according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A mobile terminal implementing various embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
The mobile terminal may be implemented in various forms. For example, the terminal described in the present invention may include a mobile terminal such as a mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), a navigation device, and the like, and a stationary terminal such as a digital TV, a desktop computer, and the like. In the following, it is assumed that the terminal is a mobile terminal. However, it will be understood by those skilled in the art that the configuration according to the embodiment of the present invention can be applied to a fixed type terminal in addition to elements particularly used for moving purposes.
Fig. 1 is a schematic hardware configuration of a mobile terminal implementing various embodiments of the present invention.
The mobile terminal 100 may include a wireless communication unit 110, an a/V (audio/video) input unit 120, a user input unit 130, a sensing unit 140, an output unit 150, a memory 160, an interface unit 170, a controller 180, and a power supply unit 190, etc. Fig. 1 illustrates a mobile terminal having various components, but it is to be understood that not all illustrated components are required to be implemented. More or fewer components may alternatively be implemented. Elements of the mobile terminal will be described in detail below.
The wireless communication unit 110 typically includes one or more components that allow radio communication between the mobile terminal 100 and a wireless communication system or network. For example, the wireless communication unit may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless internet module 113, a short-range communication module 114, and a location information module 115.
The broadcast receiving module 111 receives a broadcast signal and/or broadcast associated information from an external broadcast management server via a broadcast channel. The broadcast channel may include a satellite channel and/or a terrestrial channel. The broadcast management server may be a server that generates and transmits a broadcast signal and/or broadcast associated information or a server that receives a previously generated broadcast signal and/or broadcast associated information and transmits it to a terminal. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and the like. Also, the broadcast signal may further include a broadcast signal combined with a TV or radio broadcast signal. The broadcast associated information may also be provided via a mobile communication network, and in this case, the broadcast associated information may be received by the mobile communication module 112. The broadcast signal may exist in various forms, for example, it may exist in the form of an Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB), an Electronic Service Guide (ESG) of digital video broadcasting-handheld (DVB-H), and the like. The broadcast receiving module 111 may receive a signal broadcast by using various types of broadcasting systems. In particular, the broadcast receiving module 111 may receive digital broadcasting by using a digital broadcasting system such as a data broadcasting system of multimedia broadcasting-terrestrial (DMB-T), digital multimedia broadcasting-satellite (DMB-S), digital video broadcasting-handheld (DVB-H), forward link media (MediaFLO @), terrestrial digital broadcasting integrated service (ISDB-T), and the like. The broadcast receiving module 111 may be constructed to be suitable for various broadcasting systems that provide broadcast signals as well as the above-mentioned digital broadcasting systems. The broadcast signal and/or broadcast associated information received via the broadcast receiving module 111 may be stored in the memory 160 (or other type of storage medium).
The mobile communication module 112 transmits and/or receives radio signals to and/or from at least one of a base station (e.g., access point, node B, etc.), an external terminal, and a server. Such radio signals may include voice call signals, video call signals, or various types of data transmitted and/or received according to text and/or multimedia messages.
The wireless internet module 113 supports wireless internet access of the mobile terminal. The module may be internally or externally coupled to the terminal. The wireless internet access technology to which the module relates may include WLAN (wireless LAN) (Wi-Fi), Wibro (wireless broadband), Wimax (worldwide interoperability for microwave access), HSDPA (high speed downlink packet access), and the like.
The short-range communication module 114 is a module for supporting short-range communication. Some examples of short-range communication technologies include bluetooth (TM), Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), zigbee (TM), and the like.
The location information module 115 is a module for checking or acquiring location information of the mobile terminal. A typical example of the location information module is a GPS (global positioning system). According to the current technology, the GPS module 115 calculates distance information and accurate time information from three or more satellites and applies triangulation to the calculated information, thereby accurately calculating three-dimensional current location information according to longitude, latitude, and altitude. Currently, a method for calculating position and time information uses three satellites and corrects an error of the calculated position and time information by using another satellite. In addition, the GPS module 115 can calculate speed information by continuously calculating current position information in real time.
The a/V input unit 120 is used to receive an audio or video signal. The a/V input unit 120 may include a camera 121 and a microphone 1220, and the camera 121 processes image data of still pictures or video obtained by an image capturing apparatus in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display module 151. The image frames processed by the camera 121 may be stored in the memory 160 (or other storage medium) or transmitted via the wireless communication unit 110, and two or more cameras 1210 may be provided according to the construction of the mobile terminal. The microphone 122 may receive sounds (audio data) via the microphone in a phone call mode, a recording mode, a voice recognition mode, or the like, and can process such sounds into audio data. The processed audio (voice) data may be converted into a format output transmittable to a mobile communication base station via the mobile communication module 112 in case of a phone call mode. The microphone 122 may implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated in the course of receiving and transmitting audio signals.
The user input unit 130 may generate key input data according to a command input by a user to control various operations of the mobile terminal. The user input unit 130 allows a user to input various types of information, and may include a keyboard, dome sheet, touch pad (e.g., a touch-sensitive member that detects changes in resistance, pressure, capacitance, and the like due to being touched), scroll wheel, joystick, and the like. In particular, when the touch pad is superimposed on the display module 151 in the form of a layer, a touch screen may be formed.
The sensing unit 140 detects a current state of the mobile terminal 100 (e.g., an open or closed state of the mobile terminal 100), a position of the mobile terminal 100, presence or absence of contact (i.e., touch input) by a user with the mobile terminal 100, an orientation of the mobile terminal 100, acceleration or deceleration movement and direction of the mobile terminal 100, and the like, and generates a command or signal for controlling an operation of the mobile terminal 100. For example, when the mobile terminal 100 is implemented as a slide-type mobile phone, the sensing unit 140 may sense whether the slide-type phone is opened or closed. In addition, the sensing unit 140 can detect whether the power supply unit 190 supplies power or whether the interface unit 170 is coupled with an external device. The sensing unit 140 may include a proximity sensor 1410 as will be described below in connection with a touch screen.
The interface unit 170 serves as an interface through which at least one external device is connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The identification module may store various information for authenticating a user using the mobile terminal 100 and may include a User Identity Module (UIM), a Subscriber Identity Module (SIM), a Universal Subscriber Identity Module (USIM), and the like. In addition, a device having an identification module (hereinafter, referred to as an "identification device") may take the form of a smart card, and thus, the identification device may be connected with the mobile terminal 100 via a port or other connection means. The interface unit 170 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal and the external device.
In addition, when the mobile terminal 100 is connected with an external cradle, the interface unit 170 may serve as a path through which power is supplied from the cradle to the mobile terminal 100 or may serve as a path through which various command signals input from the cradle are transmitted to the mobile terminal. Various command signals or power input from the cradle may be used as signals for recognizing whether the mobile terminal is accurately mounted on the cradle. The output unit 150 is configured to provide output signals (e.g., audio signals, video signals, alarm signals, vibration signals, etc.) in a visual, audio, and/or tactile manner. The output unit 150 may include a display module 151, an audio output module 152, an alarm module 153, and the like.
The display module 151 may display information processed in the mobile terminal 100. For example, when the mobile terminal 100 is in a phone call mode, the display module 151 may display a User Interface (UI) or a Graphical User Interface (GUI) related to a call or other communication (e.g., text messaging, multimedia file downloading, etc.). When the mobile terminal 100 is in a video call mode or an image capturing mode, the display module 151 may display a captured image and/or a received image, a UI or GUI showing a video or an image and related functions, and the like.
Meanwhile, when the display module 151 and the touch pad are stacked on each other in the form of layers to form a touch screen, the display module 151 may serve as an input device and an output device. The display module 151 may include at least one of a Liquid Crystal Display (LCD), a thin film transistor LCD (TFT-LCD), an Organic Light Emitting Diode (OLED) display, a flexible display, a three-dimensional (3D) display, and the like. Some of these displays may be configured to be transparent to allow a user to view from the outside, which may be referred to as transparent displays, and a typical transparent display may be, for example, a TOLED (transparent organic light emitting diode) display or the like. The mobile terminal 100 may include two or more display modules (or other display devices) according to a particular desired implementation, for example, the mobile terminal may include an external display module (not shown) and an internal display module (not shown). The touch screen may be used to detect a touch input pressure as well as a touch input position and a touch input area.
The audio output module 152 may convert audio data received by the wireless communication unit 110 or stored in the memory 160 into an audio signal and output as sound when the mobile terminal is in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like. Also, the audio output module 152 may provide audio output related to a specific function performed by the mobile terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output module 152 may include a speaker, a buzzer, and the like.
The alarm module 153 may provide an output to notify the mobile terminal 100 of the occurrence of an event. Typical events may include call reception, message reception, key signal input, touch input, and the like. In addition to audio or video output, the alarm module 153 may provide output in different ways to notify the occurrence of an event. For example, the alarm module 153 may provide an output in the form of a vibration, and when a call, a message, or some other incoming communication (incomingmunication) is received, the alarm module 153 may provide a tactile output (i.e., a vibration) to inform the user thereof. By providing such a tactile output, the user can recognize the occurrence of various events even when the user's mobile phone is in the user's pocket. The alarm module 153 may also provide an output notifying the occurrence of an event via the display module 151 or the audio output module 152.
The memory 160 may store software programs and the like for processing and controlling operations performed by the controller 180, or may temporarily store data (e.g., a phonebook, messages, still images, videos, and the like) that has been or will be output. Also, the memory 160 may store data regarding various ways of vibration and audio signals output when a touch is applied to the touch screen.
The memory 160 may include at least one type of storage medium including a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, and the like. Also, the mobile terminal 100 may cooperate with a network storage device that performs a storage function of the memory 160 through a network connection.
The controller 180 generally controls the overall operation of the mobile terminal. For example, the controller 180 performs control and processing related to voice calls, data communications, video calls, and the like. In addition, the controller 180 may include a multimedia module 1810 for reproducing (or playing back) multimedia data, and the multimedia module 1810 may be constructed within the controller 180 or may be constructed separately from the controller 180. The controller 180 may perform a pattern recognition process to recognize a handwriting input or a picture drawing input performed on the touch screen as a character or an image.
The power supply unit 190 receives external power or internal power and provides appropriate power required to operate various elements and components under the control of the controller 180.
The various embodiments described herein may be implemented in a computer-readable medium using, for example, computer software, hardware, or any combination thereof. For a hardware implementation, the embodiments described herein may be implemented using at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a processor, a controller, a microcontroller, a microprocessor, an electronic unit designed to perform the functions described herein, and in some cases, such embodiments may be implemented in the controller 180. For a software implementation, the implementation such as a process or a function may be implemented with a separate software module that allows performing at least one function or operation. The software codes may be implemented by software applications (or programs) written in any suitable programming language, which may be stored in the memory 160 and executed by the controller 180.
Up to this point, mobile terminals have been described in terms of their functionality. Hereinafter, a slide-type mobile terminal among various types of mobile terminals, such as a folder-type, bar-type, swing-type, slide-type mobile terminal, and the like, will be described as an example for the sake of brevity. Accordingly, the present invention can be applied to any type of mobile terminal, and is not limited to a slide type mobile terminal.
The mobile terminal 100 as shown in fig. 1 may be configured to operate with communication systems such as wired and wireless communication systems and satellite-based communication systems that transmit data via frames or packets.
A communication system in which a mobile terminal according to the present invention is operable will now be described with reference to fig. 2.
Such communication systems may use different air interfaces and/or physical layers. For example, the air interface used by the communication system includes, for example, Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Code Division Multiple Access (CDMA), and Universal Mobile Telecommunications System (UMTS) (in particular, Long Term Evolution (LTE)), global system for mobile communications (GSM), and the like. By way of non-limiting example, the following description relates to a CDMA communication system, but such teachings are equally applicable to other types of systems.
Referring to fig. 2, the CDMA wireless communication system may include a plurality of mobile terminals 100, a plurality of Base Stations (BSs) 270, Base Station Controllers (BSCs) 275, and a Mobile Switching Center (MSC) 280. The MSC280 is configured to interface with a Public Switched Telephone Network (PSTN) 290. The MSC280 is also configured to interface with a BSC275, which may be coupled to the base station 270 via a backhaul. The backhaul may be constructed according to any of several known interfaces including, for example, E1/T1, ATM, IP, PPP, frame Relay, HDSL, ADSL, or xDSL. It will be understood that a system as shown in fig. 2 may include multiple BSCs 2750.
Each BS270 may serve one or more sectors (or regions), each sector covered by a multi-directional antenna or an antenna pointing in a particular direction being radially distant from the BS 270. Alternatively, each partition may be covered by two or more antennas for diversity reception. Each BS270 may be configured to support multiple frequency allocations, with each frequency allocation having a particular frequency spectrum (e.g., 1.25MHz,5MHz, etc.).
The intersection of partitions with frequency allocations may be referred to as a CDMA channel. The BS270 may also be referred to as a Base Transceiver Subsystem (BTS) or other equivalent terminology. In such a case, the term "base station" may be used to generically refer to a single BSC275 and at least one BS 270. The base stations may also be referred to as "cells". Alternatively, each sector of a particular BS270 may be referred to as a plurality of cell sites.
As shown in fig. 2, a Broadcast Transmitter (BT)295 transmits a broadcast signal to the mobile terminal 100 operating within the system. A broadcast receiving module 111 as shown in fig. 1 is provided at the mobile terminal 100 to receive a broadcast signal transmitted by the BT 295. In fig. 2, several Global Positioning System (GPS) satellites 300 are shown. The satellite 300 assists in locating at least one of the plurality of mobile terminals 100.
In fig. 2, a plurality of satellites 300 are depicted, but it is understood that useful positioning information may be obtained with any number of satellites. The GPS module 115 as shown in fig. 1 is generally configured to cooperate with satellites 300 to obtain desired positioning information. Other techniques that can track the location of the mobile terminal may be used instead of or in addition to GPS tracking techniques. In addition, at least one GPS satellite 300 may selectively or additionally process satellite DMB transmission.
As a typical operation of the wireless communication system, the BS270 receives reverse link signals from various mobile terminals 100. The mobile terminal 100 is generally engaged in conversations, messaging, and other types of communications. Each reverse link signal received by a particular base station 270 is processed within the particular BS 270. The obtained data is forwarded to the associated BSC 275. The BSC provides call resource allocation and mobility management functions including coordination of soft handoff procedures between BSs 270. The BSCs 275 also route the received data to the MSC280, which provides additional routing services for interfacing with the PSTN 290. Similarly, the PSTN290 interfaces with the MSC280, the MSC interfaces with the BSCs 275, and the BSCs 275 accordingly control the BS270 to transmit forward link signals to the mobile terminal 100.
Based on the above mobile terminal hardware structure and communication system, the present invention provides various embodiments of the method.
Example one
As shown in fig. 3, in this embodiment, a method for cell reselection based on signal strength includes:
s10, acquiring Reference Signal Received Power (RSRP) (Reference Signal RecevingPower) of the target cell;
s20, calculating a cell reselection characteristic value according to the reference signal receiving power;
s30, judging whether the cell reselection characteristic value is larger than the reselection threshold value of the target cell, if so, entering a step S40 to perform cell reselection, and entering the target cell from the current cell by the mobile terminal;
s50, when the cell reselection characteristic value is smaller than the reselection threshold value, judging whether the cell reselection characteristic value is larger than zero;
if so, the step S60 is performed, whether the reference signal received power is greater than a preset signal strength threshold is determined, if so, the step S40 is performed, cell reselection is performed, and the mobile terminal enters the target cell from the current cell, otherwise, the step S61 is performed, and the mobile terminal resides in the current cell.
In this embodiment, the scheme is mainly applied to the situation that the network of the mobile terminal cannot return to the optimal network in time when the environment with poor signal strength returns to the environment with good signal strength; in the prior art, when the mobile terminal changes from the 4G network to the 3G network or the 2G network due to environmental reasons or other reasons, it is difficult to return to the 4G network for a long time, and even return to a normal environment with a strong signal, it needs to wait for a long time, and even the mobile terminal needs to restart to obtain the 4G network, because the existing cell reselection mechanism determines that the higher the signal quality (for example, the highest signal quality of the 4G network, the second 3G, and the worst signal quality of the 2G network) and the higher the handover threshold, this results in that the signal strength of the current network is sometimes enough to support the mobile terminal to use the 4G network, but the mobile terminal cannot be handed over to the 4G network since the cell reselection characteristic value cannot meet the requirement of the reselection mechanism, in this embodiment, by setting a signal strength threshold in advance, when the mobile terminal detects that the reference signal receiving power of the target cell (for example, 4G) is greater than the signal strength threshold, even if the cell reselection characteristic value cannot meet the requirement of a reselection mechanism, the cell reselection can be rapidly performed by the scheme as long as the S value is greater than zero, and the user experience is improved.
In this embodiment, the target cell is a network environment with better signal quality than the current cell, for example, when the current cell is a 2G network, the target cell may be a 3G network or a 4G network, when the current cell is a 3G network, the target cell is a 4G network,
in this embodiment, after step S50, the method further includes:
and S51, if the cell reselection characteristic value is not greater than zero, entering a neighboring cell with a signal quality inferior to that of the current cell or not providing network service.
For example, when the current cell is a 3G network, if the calculated cell reselection characteristic value is smaller than zero, the mobile terminal cannot reside in the current cell and needs to enter a 2G network; when the current cell is a 2G network, if the calculated cell reselection characteristic value is smaller than zero, the mobile terminal cannot reside in the current cell and directly enters a no-service state.
In this embodiment, the step S20 includes:
according to the cell reselection S criteria, a cell reselection characteristic value (also called cell reselection S value) is calculated by the following formula:
Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)-Pcompensation
wherein Srxlex is a cell reselection characteristic value;
qrxlevmeas is Reference Signal Received Power (RSRP) of a target cell, and the unit is dBm;
qrxlevmin is the minimum receiving intensity requirement of the reference signal receiving power in the target cell, and is automatically obtained by the mobile terminal in unit dBm;
qrxlevminoffset is a preset offset; when residing on a VPLMN to search a high-priority PLMN, adopting Srxlev to evaluate the cell quality, and needing to offset Qrxlevmin for preventing a ping-pong effect;
Pcompensation＝Max(PEMAX–PUMAX，0)；
the PEMAX is the maximum uplink transmission power allowed by the terminal in the target cell, and the unit is dBm and is automatically obtained by the mobile terminal;
PUMAX is the maximum uplink transmit power determined by the terminal capability, in dBm.
In this embodiment, the reference value of RSRP of the 4G network is-90 dBm through-100 dBm, that is, when the mobile terminal in the 2G or 3G network cell detects that the RSRP of the 4G network cell is-95 dBm, the mobile terminal can switch to the 4G network as long as the calculated cell reselection characteristic value is greater than 0, even if the cell reselection characteristic value does not reach the threshold value specified by the reselection mechanism.
Example two
As shown in fig. 4, in this embodiment, a cell reselection apparatus based on signal strength includes:
an obtaining module 10, configured to obtain reference signal received power of a target cell;
a calculating module 20, configured to calculate a cell reselection characteristic value according to the reference signal received power;
a first determining module 30, configured to determine whether the cell reselection characteristic value is greater than a reselection threshold value of the target cell, if so, perform cell reselection, and enable the mobile terminal to enter the target cell from a current cell;
a second determining module 40, configured to determine whether the cell reselection characteristic value is greater than zero when the cell reselection characteristic value is smaller than the reselection threshold value;
a third determining module 50, configured to determine whether the reference signal received power is greater than a preset signal strength threshold when the cell reselection characteristic value is greater than zero, and if so, perform cell reselection, where the mobile terminal enters the target cell from the current cell;
a first cell reselection module 60, configured to perform cell reselection, where the mobile terminal enters the target cell from the current cell.
In this embodiment, the scheme is mainly applied to the situation that the network of the mobile terminal cannot return to the optimal network in time when the environment with poor signal strength returns to the environment with good signal strength; in the prior art, when the mobile terminal changes from the 4G network to the 3G network or the 2G network due to environmental reasons or other reasons, it is difficult to return to the 4G network for a long time, and even return to a normal environment with a strong signal, it needs to wait for a long time, and even the mobile terminal needs to restart to obtain the 4G network, because the existing cell reselection mechanism determines that the higher the signal quality (for example, the highest signal quality of the 4G network, the second 3G, and the worst signal quality of the 2G network) and the higher the handover threshold, this results in that the signal strength of the current network is sometimes enough to support the mobile terminal to use the 4G network, but the mobile terminal cannot be handed over to the 4G network since the cell reselection characteristic value cannot meet the requirement of the reselection mechanism, in this embodiment, by setting a signal strength threshold in advance, when the mobile terminal detects that the reference signal receiving power of the target cell (for example, 4G) is greater than the signal strength threshold, even if the cell reselection characteristic value cannot meet the requirement of a reselection mechanism, the cell reselection can be rapidly performed by the scheme as long as the S value is greater than zero, and the user experience is improved.
In this embodiment, the target cell is a network environment with better signal quality than the current cell, for example, when the current cell is a 2G network, the target cell may be a 3G network or a 4G network, when the current cell is a 3G network, the target cell is a 4G network,
as shown in fig. 5, in this embodiment, the apparatus for cell reselection based on signal strength further includes:
a second cell reselection module 70, configured to enter a neighboring cell with a signal quality inferior to that of the current cell or provide no network service if the cell reselection characteristic value is not greater than zero.
For example, when the current cell is a 3G network, if the calculated cell reselection characteristic value is smaller than zero, the mobile terminal cannot reside in the current cell and needs to enter a 2G network; when the current cell is a 2G network, if the calculated cell reselection characteristic value is smaller than zero, the mobile terminal cannot reside in the current cell and directly enters a no-service state.
In this embodiment, the calculation method of the calculation module is as follows:
calculating a cell reselection characteristic value according to the following formula:
Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)-Pcompensation
wherein Srxlex is a cell reselection characteristic value;
qrxlevmeas is the reference signal receiving power of the target cell, and the unit is dBm;
qrxlevmin is the minimum receiving intensity requirement of the reference signal receiving power in the target cell, and is automatically obtained by the mobile terminal in unit dBm;
qrxlevminoffset is a preset offset;
Pcompensation＝Max(PEMAX–PUMAX，0)；
the PEMAX is the maximum uplink transmission power allowed by the terminal in the target cell, and the unit is dBm and is automatically obtained by the mobile terminal;
PUMAX is the maximum uplink transmit power determined by the terminal capability, in dBm.
In this embodiment, the reference value of RSRP of the 4G network is-90 dBm through-100 dBm, that is, when the mobile terminal in the 2G or 3G network cell detects that the RSRP of the 4G network cell is-95 dBm, the mobile terminal can switch to the 4G network as long as the calculated cell reselection characteristic value is greater than 0, even if the cell reselection characteristic value does not reach the threshold value specified by the reselection mechanism.
EXAMPLE III
In this embodiment, a mobile terminal includes, in addition to the existing functional module in fig. 1, the cell reselection device in the second embodiment, so that cell reselection can be performed quickly, and user experience is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A method for cell reselection based on signal strength, comprising:
acquiring reference signal receiving power of a target cell;
calculating a cell reselection characteristic value according to the reference signal receiving power;
judging whether the cell reselection characteristic value is larger than a reselection threshold value of the target cell, if so, performing cell reselection, and enabling the mobile terminal to enter the target cell from the current cell; the signal quality of the target cell is better than the signal quality of the current cell;
when the cell reselection characteristic value is smaller than the reselection threshold value, judging whether the cell reselection characteristic value is larger than zero;
if so, judging whether the reference signal receiving power is greater than a preset signal strength threshold value, if so, performing cell reselection, and enabling the mobile terminal to enter the target cell from the current cell;
and if the cell reselection characteristic value is not greater than zero, entering a neighboring cell with the signal quality inferior to that of the current cell.
2. The method of claim 1, wherein calculating the cell reselection characteristic value according to the reference signal received power specifically comprises:
calculating a cell reselection characteristic value according to the following formula:
Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)-Pcompensation
wherein Srxlex is a cell reselection characteristic value;
qrxlevmeas is the reference signal receiving power of the target cell, and the unit is dBm;
qrxlevmin is the minimum receiving intensity requirement of the reference signal receiving power in the target cell, and is automatically obtained by the mobile terminal in unit dBm;
qrxlevminoffset is a preset offset;
Pcompensation＝Max(PEMAX–PUMAX，0)；
the PEMAX is the maximum uplink transmission power allowed by the terminal in the target cell, and the unit is dBm and is automatically obtained by the mobile terminal;
PUMAX is the maximum uplink transmit power determined by the terminal capability, in dBm.
3. A signal strength based cell reselection apparatus, comprising:
an obtaining module, configured to obtain a reference signal received power of a target cell;
the calculating module is used for calculating a cell reselection characteristic value according to the reference signal receiving power;
a first judging module, configured to judge whether the cell reselection characteristic value is greater than a reselection threshold value of the target cell,
if so, cell reselection is carried out, and the mobile terminal enters the target cell from the current cell; the signal quality of the target cell is better than the signal quality of the current cell;
the second judging module is used for judging whether the cell reselection characteristic value is larger than zero or not when the cell reselection characteristic value is smaller than the reselection threshold value;
a third judging module, configured to, when the cell reselection characteristic value is greater than zero, judge whether the reference signal received power is greater than a preset signal strength threshold, if yes, perform cell reselection, and enter the target cell from the current cell by the mobile terminal;
the first cell reselection module is used for reselecting the cell, and the mobile terminal enters the target cell from the current cell;
and the second cell reselection module is used for entering an adjacent cell with the signal quality inferior to the current cell if the cell reselection characteristic value is not greater than zero.
4. The apparatus of claim 3, wherein the calculation module calculates the following steps:
calculating a cell reselection characteristic value according to the following formula:
Srxlev＝Qrxlevmeas–(Qrxlevmin+Qrxlevminoffset)-Pcompensation
wherein Srxlex is a cell reselection characteristic value;
qrxlevmeas is the reference signal receiving power of the target cell, and the unit is dBm;
qrxlevmin is the minimum receiving intensity requirement of the reference signal receiving power in the target cell, and is automatically obtained by the mobile terminal in unit dBm;
qrxlevminoffset is a preset offset;
Pcompensation＝Max(PEMAX–PUMAX，0)；
the PEMAX is the maximum uplink transmission power allowed by the terminal in the target cell, and the unit is dBm and is automatically obtained by the mobile terminal;
PUMAX is the maximum uplink transmit power determined by the terminal capability, in dBm.
5. A mobile terminal, characterized in that it comprises the apparatus of claim 3 or 4.
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| CN107046696B (en) * | 2017-04-14 | 2020-08-07 | 南京寰嘉物联网科技有限公司 | Communication network switching method and mobile terminal |
| CN108093449A (en) * | 2017-12-26 | 2018-05-29 | 广东欧珀移动通信有限公司 | Method for switching network and device |
| JP2022544317A (en) * | 2019-08-15 | 2022-10-17 | ホアウェイ・テクノロジーズ・カンパニー・リミテッド | Measurement methods, devices and systems |
| CN110798871A (en) * | 2019-10-31 | 2020-02-14 | RealMe重庆移动通信有限公司 | Information processing method, terminal device and storage medium |
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| WO2013107414A1 (en) * | 2012-01-21 | 2013-07-25 | 华为技术有限公司 | Method and device for measurement enhancement in wireless communication system |
| US8503400B2 (en) * | 2008-09-18 | 2013-08-06 | Sharp Laboratories Of America, Inc. | Systems and methods for closed subscriber group cell reselection |
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| CN101841871A (en) * | 2009-03-17 | 2010-09-22 | 中兴通讯股份有限公司 | Cell reselection method and device based on home NB cell |
| CN101854690A (en) * | 2009-03-31 | 2010-10-06 | 北京三星通信技术研究有限公司 | Cell reselection method and dual-mode terminal thereof |
| CN102204344B (en) * | 2011-04-18 | 2014-03-12 | 华为技术有限公司 | Method and terminal for avoiding cell pingpong reselection |
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| US8503400B2 (en) * | 2008-09-18 | 2013-08-06 | Sharp Laboratories Of America, Inc. | Systems and methods for closed subscriber group cell reselection |
| WO2013107414A1 (en) * | 2012-01-21 | 2013-07-25 | 华为技术有限公司 | Method and device for measurement enhancement in wireless communication system |
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