CN115968005A

CN115968005A - Cell reselection method, device, terminal and computer readable storage medium

Info

Publication number: CN115968005A
Application number: CN202211671163.3A
Authority: CN
Inventors: 唐树元
Original assignee: Zeku Technology Beijing Corp Ltd
Current assignee: Zeku Technology Beijing Corp Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-04-14

Abstract

The application relates to a cell reselection method, a cell reselection device, a terminal and a computer-readable storage medium. The method comprises the following steps: determining a first moving state of a terminal according to speed information of the terminal; and performing cell reselection according to the first moving state. By adopting the method, the cell reselection can be accurately carried out.

Description

Cell reselection method, device, terminal and computer readable storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a cell reselection method, apparatus, terminal, computer-readable storage medium, and computer program product.

Background

In order to ensure that the terminal always resides in a suitable cell, after the terminal resides in a certain cell for a certain time, the terminal performs cell reselection. In a conventional cell reselection method, a current moving state of a terminal is determined by counting cell reselection times within a period of time, and then cell reselection is performed according to the current moving state of the terminal and a reselection criterion.

However, the larger the number of RRHs (Remote Radio heads) sharing the cell identifier is, the more the terminal doubles the value of the number of times of counting the cell reselection, so that the determination of the mobile state by the number of times of cell reselection is not accurate, and the cell reselection is not accurate.

Disclosure of Invention

Embodiments of the present application provide a cell reselection method, apparatus, terminal, computer-readable storage medium, and computer program product, which can improve accuracy of cell reselection.

A cell reselection, comprising:

determining a first moving state of a terminal according to speed information of the terminal;

and performing cell reselection according to the first moving state.

A cell reselection apparatus comprising:

the determining module is used for determining a first moving state of the terminal according to the speed information of the terminal;

and the reselection module is used for reselecting the cell according to the first moving state.

A terminal comprising a memory and a processor, the memory having stored therein a computer program that, when executed by the processor, causes the processor to perform the steps of:

and performing cell reselection according to the first moving state.

A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:

and performing cell reselection according to the first moving state.

A computer program product comprising a computer program which when executed by a processor performs the steps of:

and performing cell reselection according to the first moving state.

According to the cell reselection method, the cell reselection device, the terminal, the computer readable storage medium and the computer program product, the first moving state of the terminal is determined according to the speed information of the terminal, and the acquired speed information is not affected by the current resident cell of the terminal, so that the moving state of the terminal can be accurately and quickly judged according to the speed information. And performing cell reselection according to the first moving state, wherein the cell reselection can be accurately and quickly performed in the moving state of the terminal, so that a cell with better signal quality is reselected.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a diagram of an application environment of a cell reselection method in one embodiment;

FIG. 2 is a flow diagram of a method for cell reselection in one embodiment;

FIG. 3 is a flowchart of a cell reselection method in a high speed train scenario according to an embodiment;

FIG. 4 is a flow diagram of performing Doppler frequency offset estimation in one embodiment;

FIG. 5 is a flow chart illustrating determining a mobility state of a terminal in one embodiment;

FIG. 6 is a schematic diagram of a cell reselection method in a high-speed train scenario according to an embodiment;

fig. 7 is a block diagram of a cell reselection apparatus in one embodiment;

fig. 8 is a block diagram of a terminal in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The cell reselection method provided by the embodiment of the present application may be applied to an application environment as shown in fig. 1. Where the terminal 102 communicates with the network device 104 over a network. The terminal 102 determines a first moving state of the terminal according to its own speed information. The terminal 102 performs cell reselection to access the network device 104 according to the first mobility state. The network device 104 may be, but is not limited to, a base station, and the terminal 102 may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, internet of things devices, and portable wearable devices, where the internet of things devices may be smart speakers, smart televisions, smart air conditioners, smart car devices, and the like. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, and the like.

In an embodiment, as shown in fig. 2, a cell reselection method is provided, which is described by taking the application of the method to the terminal in fig. 1 as an example, and includes the following steps:

step 202, determining a first moving state of the terminal according to the speed information of the terminal.

The speed information refers to information related to a speed of the terminal, and may include, for example, at least one of a current speed and a current acceleration of the terminal, or at least one of an average speed and an average acceleration in a recent period of time.

And when the terminal is in the train operation scene, taking the speed information of the train operation as the speed information of the terminal. For example, the current acceleration of the train operation is used as the current acceleration of the terminal, and the current speed of the train operation is used as the current speed of the terminal.

The moving state comprises a uniform moving state, a deceleration moving state and an acceleration moving state. At least one of acceleration and speed is different among the uniform-speed moving state, the deceleration moving state and the acceleration moving state.

The first moving state refers to a current moving state of the terminal or a moving state within a recent period of time, and may be specifically a constant-speed moving state, a deceleration moving state or an acceleration moving state.

For example, the terminal may acquire speed information including at least one of a current speed and a current acceleration of the terminal, and determine the first moving state of the terminal according to the speed information.

In this embodiment, when the terminal is in a train operation scene, the speed information of the train may be acquired, and the speed information of the train is used as the speed information of the terminal.

And 204, performing cell reselection according to the first moving state.

The Cell reselection is Cell reselection completed by the terminal in a non-Cell-DCH (Cell-DedicatedChannel) state. When a terminal UE resides in a cell, the signal strength of the current cell and nearby cells is changing continuously as the UE moves. When the signal quality of the cell in which the UE is located is worse and worse, the terminal starts to measure signals of other cells so as to reselect a more proper cell.

Illustratively, the terminal performs cell reselection according to the first moving state of the terminal. For example, the terminal may perform cell reselection in the constant velocity moving state, or in the reduced velocity moving state, or in the accelerated moving state.

In this embodiment, performing cell reselection according to the first moving state includes: determining a target reselection condition associated with the first mobility state; and acquiring cell reselection information, and performing cell reselection according to the cell reselection information and target reselection conditions.

Wherein the different mobility states are associated with respective pre-set reselection conditions. The preset reselection condition refers to a preset condition for cell reselection, and specifically refers to a condition for reselecting a candidate cell from a cell where the terminal currently resides. The candidate cell may be a neighboring cell of a currently camped cell, and the cell where the terminal currently camped may be referred to as a serving cell.

The target reselection condition refers to a reselection condition associated with the first mobility state of the terminal, that is, a condition for the terminal in the first mobility state to reselect from a current camped cell to a candidate cell.

Wherein the cell reselection information refers to reselection parameters related to cell reselection. The cell reselection information may include at least one of a reselection threshold of a frequency point, a preset reselection bias value, a preset reselection hysteresis value, a preset scaling factor, and a preset duration.

The reselection threshold is the following relevant threshold value for cell reselection, such as a threshold value of signal quality.

The preset reselection offset value Q _ offset defines an offset value of the neighboring cell, and the larger the parameter value is, the harder it is to reselect the neighboring cell.

The preset reselection hysteresis value Q _ Hyst is a parameter that controls the serving cell ranking hysteresis, which may make the serving cells to have a certain biased amount. When the cell is reselected, the larger the hysteresis value is, the larger the boundary of the serving cell is, the more difficult it is to reselect the neighboring cell, and ping-pong reselection under the same signal strength is avoided.

A predetermined duration, namely, a reselection timer Treselection or Treselection eutran, indicates that the neighbor cell signals can be reselected all the time or only if the corresponding cell reselection criteria are met during the time.

And the preset scaling factor is used for adjusting the preset duration to reduce the preset duration, so that the signals of the adjacent cells are easier to always or meet the corresponding cell reselection criterion within the reduced time, and the probability that the terminal resides in the adjacent cells is increased.

For example, the terminal may obtain an association relationship between different moving states and a preset reselection condition, and use the preset reselection condition associated with the first moving state as a target reselection condition according to the association relationship.

And the network equipment broadcasts cell reselection information required by the terminal for cell reselection in the system message. The network device refers to a device for the terminal to access the network, and may be a base station, for example. And the terminal acquires cell reselection information from the network equipment system message, and performs cell reselection according to the cell reselection information and target reselection conditions to judge whether to reselect a candidate cell from the cell where the terminal currently resides.

In the conventional cell reselection, when a terminal is connected to RRHs sharing the same cell identifier, reselection and switching are not required, and the more the number of RRH heads sharing the cell identifier, the more the terminal doubles the statistical frequency value of the cell reselection, namely the frequency of the cell reselection is influenced by the cell where the terminal currently resides, so that the inaccurate judgment of the mobile state of the terminal is made by the frequency of the cell reselection.

In the cell reselection method, the first moving state of the terminal is determined according to the speed information of the terminal, and the acquired speed information is not influenced by the current resident cell of the terminal, so that the moving state of the terminal can be accurately and quickly judged according to the speed information. And cell reselection is carried out according to the first moving state, and the cell reselection can be accurately and quickly carried out under the moving state of the terminal, so that a cell with better signal quality is reselected.

In this embodiment, a target reselection condition associated with the first moving state may also be determined, and a reselection condition that needs to be used by the terminal for cell reselection in the first moving state may be accurately selected, so that after cell reselection information is obtained, cell reselection is performed according to the cell reselection information and the target reselection condition, and thus cell reselection is accurately and quickly performed in the target moving state, and a cell with better signal quality is reselected.

In one embodiment, the method further comprises: and performing Doppler frequency offset estimation on the reference signal of the cell where the terminal currently resides to obtain the speed information of the terminal.

For example, the terminal may determine a current camping cell, perform doppler frequency offset estimation on a reference signal of the current camping cell, estimate at least one of a current velocity and a current acceleration, and use the at least one of the current velocity and the current acceleration as velocity information of the terminal.

The reference Signal may be a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS). The doppler frequency offset estimate may also be an enhanced doppler frequency offset estimate.

In this embodiment, sampling processing is performed on the reference signal to obtain sampling information. And carrying out frequency offset estimation based on the sampling information to obtain original speed information. And carrying out frequency offset correction processing on the original speed information to obtain the speed information of the terminal.

In the embodiment, the Doppler frequency offset estimation is carried out on the reference signal of the cell where the terminal currently resides, so that the speed information of the terminal can be accurately estimated.

In one embodiment, the velocity information includes a current acceleration and/or a current velocity of the terminal.

For example, the speed information of the terminal may specifically include a current acceleration of the terminal, and the terminal determines the first moving state of the terminal according to the current acceleration.

Or, the speed information of the terminal may specifically include a current speed of the terminal, and the terminal determines the first moving state of the terminal according to the current speed.

Or, the speed information of the terminal may specifically include a current acceleration and a current speed of the terminal, and the terminal determines the first moving state of the terminal according to the current speed and the current acceleration.

In this embodiment, the current acceleration and/or the current speed of the terminal is used as the speed information of the terminal, the moving state of the terminal can be accurately determined according to the current acceleration and/or the current speed, and the moving state of the terminal can be more accurately determined without the speed and the acceleration of the terminal being affected by the current residential cell.

In one embodiment, the first movement state is one of a plurality of movement states; the acceleration and/or velocity of any two of the plurality of movement states are different.

Illustratively, the first moving state is one of a plurality of moving states, and the plurality of moving states includes a constant moving state, a deceleration moving state and an acceleration moving state, i.e. the first moving state is the constant moving state, the deceleration moving state or the acceleration moving state. The acceleration of any two moving states in the uniform-speed moving state, the deceleration moving state and the acceleration moving state is different, or the speed of any two moving states is different, or the acceleration and the speed of any two moving states are different.

In this embodiment, the uniform movement state may be any one of a plurality of uniform movement states, and the movement speeds of different uniform movement states are different. For example, the first uniform motion state, the second uniform motion state or the third uniform motion state may be used. The acceleration of the first uniform motion state, the second uniform motion state and the third uniform motion state is equal to 0, but the motion speeds are different.

The deceleration moving state may be any one of a plurality of deceleration moving states, and the moving speed is different between different deceleration moving states. For example, the first reduced speed movement state, the second reduced speed movement state or the third reduced speed movement state. The acceleration of the first deceleration moving state, the second deceleration moving state and the third deceleration moving state is less than 0, but the moving speeds are different.

The acceleration movement state may specifically be any one of a plurality of acceleration movement states, and the movement speed differs between different acceleration movement states. For example, the first accelerated moving state, the second accelerated moving state, or the third accelerated moving state. The acceleration of the first acceleration moving state, the second acceleration moving state and the third acceleration moving state is greater than 0, but the moving speeds are different from each other.

In this embodiment, the first movement state is one of a plurality of movement states, and the acceleration and/or the velocity of any two of the plurality of movement states are different, so that the different movement states can be divided according to the acceleration and/or the velocity.

In one embodiment, determining the first movement state of the terminal based on the velocity information of the terminal includes:

when the current acceleration is equal to 0 and the current speed is less than a first speed threshold value, the terminal is in a first constant-speed moving state; or the like, or, alternatively,

under the conditions that the current acceleration is equal to 0, the current speed is greater than or equal to a first speed threshold value, and the current speed is less than a second speed threshold value, the terminal is in a second uniform moving state; or the like, or, alternatively,

and when the current acceleration is equal to 0 and the current speed is greater than or equal to the second speed threshold value, the terminal is in a third constant-speed moving state.

The first speed threshold value and the second speed threshold value are preset speed threshold values and are used for judging the moving state of the terminal. The first speed threshold is less than the second speed threshold.

Illustratively, the speed information of the terminal includes a current acceleration and a current speed of the terminal. And comparing the current acceleration with 0, and comparing the current speed with a first speed threshold value and a second speed threshold value. And under the condition that the current acceleration is equal to 0 and the current speed is less than the first speed threshold value, the terminal can judge that the terminal is in a first constant-speed moving state.

In this embodiment, the terminal may determine that the terminal is in the second uniform movement state when the current acceleration is equal to 0, the current speed is greater than or equal to the first speed threshold, and the current speed is less than the second speed threshold.

In this embodiment, the terminal may determine that the terminal is in the third uniform movement state when the current acceleration is equal to 0 and the current speed is greater than or equal to the second speed threshold.

In this embodiment, the moving state of the terminal is determined according to whether the current acceleration of the terminal is equal to 0 and the comparison result between the current speed and the different speed threshold values. Under the condition that the current acceleration is 0, the terminal can be preliminarily judged to be in the uniform-speed moving state, and the terminal is further judged to be in which uniform-speed moving state according to the current speed, so that the judgment on the moving state is more accurate.

under the condition that the current acceleration is smaller than 0 and the current speed is smaller than a third speed threshold value, the terminal is in a first speed reduction moving state; or the like, or, alternatively,

under the conditions that the current acceleration is less than 0, the current speed is greater than or equal to a third speed threshold value and the current speed is less than a fourth speed threshold value, the terminal is in a second speed reduction moving state; or the like, or, alternatively,

and under the condition that the current acceleration is less than 0 and the current speed is greater than or equal to a fourth speed threshold value, the terminal is in a third speed reduction moving state.

And the third speed threshold value and the fourth speed threshold value are preset speed threshold values and are used for judging the moving state of the terminal.

Illustratively, the velocity information of the terminal includes a current acceleration and a current velocity of the terminal. And comparing the current acceleration with 0, and comparing the current speed with a third speed threshold value and a fourth speed threshold value.

And under the conditions that the current acceleration is less than 0 and the current speed is less than a third speed threshold value, the terminal can judge that the terminal is in a first speed reduction moving state.

In this embodiment, the terminal may determine that it is in the second reduced-speed moving state when the current acceleration is less than 0, the current speed is greater than or equal to the third speed threshold, and the current speed is less than the fourth speed threshold.

In this embodiment, the terminal may determine that it is in the third reduced-speed moving state when the current acceleration is less than 0 and the current speed is greater than or equal to the fourth speed threshold.

In this embodiment, the third speed threshold value is determined according to the first speed threshold value and a preset speed offset value. The fourth speed threshold value is determined according to the second speed threshold value and a preset speed deviation value. The first speed threshold value and the third speed threshold value are both independently used for judging whether the terminal is in a low-speed state, the first speed threshold value can be specifically and independently used for judging whether the terminal is in the low-speed state under the condition of constant speed, the third speed threshold value can be specifically and independently used for judging whether the terminal is in the low-speed state under the condition of speed reduction, and the third speed threshold value corresponding to the low-speed state under the condition of speed reduction is set through the first speed threshold value and the preset speed deviation value, so that the speed thresholds corresponding to the low-speed state under the condition of constant speed and the low-speed state under the condition of speed reduction are more accurate, and the moving state of the terminal can be more accurately judged.

And the second speed threshold value is combined with the first speed threshold value to judge whether the terminal is in a medium speed state under the condition of constant speed, the fourth speed threshold value is combined with the third speed threshold value to judge whether the terminal is in a medium speed state under the condition of speed reduction, the fourth speed threshold value can be independently used for judging whether the terminal is in a high speed state under the condition of speed reduction, and the fourth speed threshold value is determined according to the second speed threshold value and a preset speed deviation value, so that the setting of the fourth speed threshold value is more accurate, and the moving state of the terminal is more accurately judged.

In this embodiment, the sum of the first speed threshold value and the preset speed offset value is used as the third speed threshold value. And taking the sum of the second speed threshold value and a preset speed deviation value as a fourth speed threshold value.

And under the condition that the current acceleration is less than 0 and the current speed is less than the sum of the first speed threshold value and the preset speed deviation value, the terminal is in a first speed reduction moving state.

And under the conditions that the current acceleration is less than 0, the current speed is greater than or equal to the sum of the first speed threshold value and the preset speed deviation value, and the current speed is less than or equal to the sum of the second threshold value and the preset speed deviation value, the terminal is judged to be in a second speed reduction moving state.

And under the conditions that the current acceleration is less than 0 and the current speed is greater than the sum of the second speed threshold value and the preset speed deviation value, judging that the terminal is in a third speed reduction moving state.

In this embodiment, the moving state of the terminal is determined according to whether the current acceleration of the terminal is less than 0 and the comparison result between the current speed and the different speed threshold values. Under the condition that the current acceleration is smaller than 0, the terminal can be preliminarily judged to be in the deceleration moving state, and the terminal is further judged to be in which deceleration moving state according to the current speed, so that the judgment on the moving state is more accurate.

under the condition that the current acceleration is greater than 0 and the current speed is less than a fifth speed threshold value, judging that the terminal is in a first acceleration moving state; or the like, or a combination thereof,

under the conditions that the current acceleration is greater than 0, the current speed is greater than or equal to a fifth speed threshold value and the current speed is less than a sixth speed threshold value, the terminal is in a second acceleration moving state; or the like, or, alternatively,

and under the condition that the current acceleration is greater than 0 and the current speed is greater than or equal to a sixth speed threshold value, the terminal is in a third acceleration moving state.

Illustratively, the velocity information of the terminal includes a current acceleration and a current velocity of the terminal. And comparing the current acceleration with 0, and comparing the current speed with a fifth speed threshold value and a sixth speed threshold value. And under the condition that the current acceleration is greater than 0 and the current speed is less than a fifth speed threshold value, the terminal can judge that the terminal is in a first acceleration moving state.

In this embodiment, the terminal may determine that the terminal is in the second acceleration moving state when the current acceleration is greater than 0, the current speed is greater than or equal to the fifth speed threshold, and the current speed is less than the sixth speed threshold.

In this embodiment, the terminal may determine that the terminal is in the third accelerated moving state when the current acceleration is greater than 0 and the current speed is greater than or equal to the sixth speed threshold.

In this embodiment, the fifth speed threshold value is determined according to the first speed threshold value and a preset speed offset value. The sixth speed threshold value is determined according to the second speed threshold value and a preset speed offset value. The first speed threshold value and the fifth speed threshold value are both independently used for judging whether the terminal is in a low-speed state, the first speed threshold value is specifically used for judging whether the terminal is in the low-speed state under the condition of constant speed, the fifth speed threshold value is specifically used for judging whether the terminal is in the low-speed state under the condition of acceleration, and the fifth speed threshold value corresponding to the low-speed state under the condition of acceleration is set through the first speed threshold value and a preset speed deviation value, so that the speed thresholds corresponding to the low-speed state under the condition of constant speed and the low-speed state under the condition of acceleration are more accurate, and the moving state of the terminal can be more accurately judged.

And the second speed threshold value is combined with the first speed threshold value to judge whether the terminal is in a medium speed state under the condition of constant speed, the sixth speed threshold value is combined with the fifth speed threshold value to judge whether the terminal is in a medium speed state under the condition of acceleration, and the sixth speed threshold value can be independently used for judging whether the terminal is in a high speed state under the condition of acceleration, so that the sixth speed threshold value is determined according to the second speed threshold value and a preset speed deviation value, the setting of the sixth speed threshold value is more accurate, and the moving state of the terminal is judged more accurately.

In this embodiment, the difference between the first speed threshold and the preset speed offset is used as the fifth speed threshold. And taking the difference between the second speed threshold value and the preset speed deviation value as a sixth speed threshold value.

In this embodiment, the moving state of the terminal is determined according to whether the current acceleration of the terminal is greater than 0 and the comparison result between the current speed and the different speed threshold values. Under the condition that the current acceleration is greater than 0, the terminal can be preliminarily judged to be in the accelerated moving state, and the terminal is further judged to be in which accelerated moving state according to the current speed, so that the accelerated moving state is judged more accurately.

In one embodiment, the target reselection conditions include: at least one of a first reselection condition based on a preset reselection hysteresis value and a second reselection condition based on a preset duration.

In this embodiment, the first reselection condition and the second reselection condition further include at least one of:

the residence time of the terminal in the current residence cell is longer than the preset time; and the target signal quality value and the target signal level value of the candidate cell are both larger than a preset value, and the candidate cell is a neighbor cell of the current resident cell of the terminal.

For example, the time length of the terminal staying in the current resident cell is greater than 1 second.

In this embodiment, under the condition that the current cell where the terminal resides and the candidate cell correspond to the same frequency point, cell reselection is performed according to the first reselection condition. The candidate cell is a neighboring cell of a current resident cell of the terminal.

In this embodiment, the first reselection condition based on the preset reselection hysteresis value includes:

and the first signal quality value of the current resident cell obtained based on the preset reselection hysteresis value is smaller than the second signal quality value of the candidate cell.

In this embodiment, the determining that the first signal quality value of the current camping cell obtained based on the preset reselection hysteresis value is smaller than the second signal quality value of the candidate cell includes:

and in the first uniform velocity moving state, the first deceleration moving state or the first acceleration moving state, the first signal quality value of the current resident cell obtained based on the preset reselection hysteresis value is smaller than the second signal quality value of the candidate cell.

And obtaining the reference signal receiving power obtained by measuring the reference signal by the current resident cell, obtaining the temporary application offset, summing the reference signal receiving power and the preset reselection hysteresis value to obtain a value, and solving the difference value between the value and the temporary application offset to obtain the first signal quality value. The temporary application offset is a temporary offset which is set in advance when the terminal connection fails.

In this embodiment, the first uniform velocity moving state, the first deceleration moving state, and the first acceleration moving state all belong to a low velocity moving state, that is, are in a state where the movement is relatively slow, and the preset reselection hysteresis value is not required to be adjusted in the low velocity moving state, so that when the terminal is in any one of the low velocity states, the preset reselection hysteresis value is not scaled, and the first signal quality value of the currently camped cell is accurately calculated based on the measured reference signal received power and the preset reselection hysteresis value, so that the cell with the best signal quality is reselected in the low velocity state.

in the second uniform movement state, the compensated first signal quality of the current resident cell obtained based on the preset reselection hysteresis value and the first bias value corresponding to the second uniform movement state is smaller than the second signal quality of the candidate cell;

in the second deceleration moving state, the compensated first signal quality of the current resident cell obtained on the basis of the preset reselection hysteresis value and the first bias value corresponding to the second deceleration moving state is smaller than the second signal quality of the candidate cell;

and in the second accelerated moving state, the compensated first signal quality of the current resident cell obtained based on the preset reselection hysteresis value and the first bias value corresponding to the second accelerated moving state is smaller than the second signal quality of the candidate cell.

In this embodiment, the second constant-speed moving state, the second deceleration moving state, and the second acceleration moving state all belong to medium-speed moving states, different first bias values are configured for each medium-speed moving state, so as to scale the preset reselection hysteresis value by the first bias value, so as to reduce the requirement for the signal quality in the medium-speed moving state, so that the candidate cell can more easily satisfy the reselection condition, and thus the candidate cell can be more quickly and more easily reselected in different medium-speed moving states.

in a third uniform movement state, obtaining a second signal quality which is smaller than the candidate cell after compensation of the first signal quality of the current resident cell based on a preset reselection hysteresis value and a second bias value corresponding to the third uniform movement state;

in a third deceleration moving state, obtaining a second signal quality which is smaller than the candidate cell and is compensated by the first signal quality of the current resident cell based on a preset reselection hysteresis value and a second bias value corresponding to the third deceleration moving state;

and in a third accelerated moving state, the compensated first signal quality of the current resident cell obtained based on the preset reselection hysteresis value and a second bias value corresponding to the third accelerated moving state is smaller than the second signal quality of the candidate cell.

In this embodiment, the third uniform moving state, the third deceleration moving state, and the third acceleration moving state all belong to a high-speed moving state, that is, are in a relatively fast moving state, and different first offset values are configured for each high-speed moving state, so as to scale the preset reselection hysteresis value by the first offset value, so that the requirement on the signal quality is reduced under the conditions of a relatively fast moving speed at a uniform speed, a relatively fast moving speed at deceleration, a relatively fast moving speed at acceleration, and the like, so that the candidate cell can more easily satisfy the reselection condition, and can more quickly reside in a new cell under the condition of a relatively fast moving speed of the terminal.

In one embodiment, the target reselection condition comprises a first reselection condition based on a preset reselection hysteresis value and a second reselection condition based on a preset duration; the preset duration time comprises the same-frequency preset duration time when the current resident cell and the candidate cell correspond to the same frequency point; the first signal quality value of the current resident cell obtained based on the preset reselection hysteresis value is smaller than the second signal quality value of the candidate cell, and the method comprises the following steps:

and within the same-frequency duration determined based on the same-frequency preset duration, the first signal quality value of the current resident cell obtained based on the preset reselection hysteresis value is smaller than the second signal quality value of the candidate cell.

In this embodiment, in the first uniform velocity moving state, the first deceleration moving state, or the first acceleration moving state, the same-frequency duration is the same-frequency preset duration. The first uniform-speed moving state, the first deceleration moving state and the first acceleration moving state all belong to a low-speed moving state, the terminal moving speed is low, scaling on the same-frequency preset duration is not needed, the candidate cell is reselected when the signal quality of the candidate cell is greater than that of a pre-resident cell within a period of time, the signal quality of the candidate cell is better and more stable, and the cell with better and more stable signal quality can be reselected.

Under the second constant-speed moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a first scaling factor corresponding to the second constant-speed moving state; under the second speed reduction moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a first scaling factor corresponding to the second speed reduction moving state; under the second accelerated moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a first scaling factor corresponding to the second accelerated moving state; the corresponding first scaling factors in the second constant-speed moving state, the second deceleration moving state and the second acceleration moving state may be the same or different.

In this embodiment, the second constant-speed moving state, the second deceleration moving state, and the second acceleration moving state all belong to medium-speed moving states, different first scaling factors are configured for each medium-speed moving state, so as to scale the same-frequency duration time by the first scaling factor, so as to reduce the time requirement to be met for the signal quality in the medium-speed moving state, so that the candidate cell can more easily meet reselection conditions, and thus the candidate cell can be more quickly and more easily reselected in different medium-speed moving states.

In the third uniform movement state, the same-frequency duration is obtained according to the same-frequency preset duration and a second scaling factor corresponding to the third uniform movement state; under the third deceleration moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a second scaling factor corresponding to the third deceleration moving state; in the third accelerated moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a second scaling factor corresponding to the third accelerated moving state; the corresponding second scaling factors in the third uniform-speed moving state, the third deceleration moving state and the third acceleration moving state may be the same or different.

In this embodiment, the third uniform velocity moving state, the third deceleration moving state, and the third acceleration moving state all belong to a high velocity moving state, that is, are in a relatively fast moving state, and different second scaling factors are configured for each high velocity moving state to scale the same frequency preset duration time by the second scaling factor, so that the time requirement to be met for the signal quality is reduced under the condition that the moving speed of the terminal is relatively fast, so that the candidate cell is more likely to meet the reselection condition, and then the candidate cell can be more rapidly resided under the condition that the moving speed of the terminal is relatively fast.

In one embodiment, in the case that there are a plurality of candidate cells whose second signal quality values are greater than the first signal quality value, the terminal reselects the candidate cell corresponding to the largest second signal quality value.

In an embodiment, under the condition that a current resident cell where the terminal resides and a candidate cell correspond to different frequency points, cell reselection is performed according to a second reselection condition. The candidate cell is a neighboring cell of the current resident cell.

In this embodiment, the preset duration includes pilot frequency preset duration when the current resident cell and the candidate cell correspond to different frequency points; a second reselection condition based on a preset duration, comprising:

and selecting the candidate cell under the condition that the measured received signal quality value of the candidate cell meets a signal quality threshold value in the pilot frequency duration determined based on the pilot frequency preset duration.

The signal quality threshold is a preset critical value for judging the value of the received signal quality, and is used for judging whether the candidate cell meets the second reselection condition.

In this embodiment, when the system message of the current resident cell configured by the network device carries the reselection threshold parameter of the current resident cell, the cell is reselected according to the second reselection condition.

In this embodiment, the signal quality threshold includes a first quality threshold corresponding to the candidate cell, and the first quality threshold is configured when the priority of the frequency point of the candidate cell is higher than the priority of the frequency point of the currently camped cell.

In this embodiment, in a pilot frequency duration determined based on a pilot frequency preset duration, under a condition that a measured received signal quality value of a candidate cell satisfies a signal quality threshold, selecting the candidate cell includes:

and selecting the candidate cell under the condition that the measured received signal quality value of the candidate cell is greater than a first quality threshold value in the pilot frequency duration determined based on the pilot frequency preset duration.

In this embodiment, the signal quality threshold includes a second quality threshold corresponding to the candidate cell and a third quality threshold corresponding to the currently camped cell. The second quality threshold and the third quality threshold are configured under the condition that the priority of the frequency point of the candidate cell is lower than the priority of the frequency point of the current resident cell.

The second quality threshold is a preset critical value for judging the received signal quality value of the candidate cell. The third quality threshold is a preset critical value for judging the quality value of the received signal of the current resident cell.

In this embodiment, selecting a candidate cell when the measured received signal quality value of the candidate cell satisfies the signal quality threshold within the pilot frequency duration determined based on the pilot frequency preset duration includes:

and selecting the candidate cell under the condition that the measured received signal quality value of the current resident cell is smaller than a third quality threshold value and the measured received signal quality value of the candidate cell is larger than a second quality threshold value within the pilot frequency duration determined based on the pilot frequency preset duration.

In this embodiment, in the presence of the first comparison result corresponding to the multiple candidate cells, the terminal reselects the candidate cell with the highest priority among the priorities of the frequency points corresponding to the multiple candidate cells.

In one embodiment, the preset duration includes pilot frequency preset duration when the current resident cell and the candidate cell correspond to different frequency points; a second reselection condition based on a preset duration, comprising:

and selecting the candidate cell under the condition that the measured received signal level value of the candidate cell meets a signal level threshold value within the pilot frequency duration determined based on the pilot frequency preset duration.

Wherein the received signal level value, i.e. the cell selection received level value, is used for evaluating the signal level received by the candidate cell in the cell selection phase. The signal level threshold is a critical value set in advance for judging a received signal level value, and is used for judging whether the candidate cell satisfies the second reselection condition.

In this embodiment, when the system message of the current resident cell configured by the network access device does not carry the reselection threshold parameter of the current resident cell, the cell is reselected according to the second reselection condition.

In this embodiment, the signal level threshold includes a first level threshold corresponding to the candidate cell, where the first level threshold is configured when the priority of the frequency point of the candidate cell is higher than the priority of the frequency point of the currently camped cell.

In this embodiment, in a pilot frequency duration determined based on a pilot frequency preset duration, selecting a candidate cell when a measured received signal level value of the candidate cell satisfies a signal level threshold, includes:

and within the pilot frequency duration determined based on the pilot frequency preset duration, the measured received signal level value of the candidate cell is greater than a first level threshold value.

In this embodiment, the signal level threshold includes a second level threshold corresponding to the candidate cell and a third level threshold corresponding to the currently camped cell. The second level threshold and the third level threshold are configured when the priority of the frequency point of the candidate cell is lower than the priority of the frequency point of the current resident cell.

The second level threshold is a critical value set in advance for judging a received signal level value of the candidate cell. The third level threshold is a preset critical value for judging the received signal level value of the current camping cell.

and in the pilot frequency duration determined based on the pilot frequency preset duration, the measured received signal level value of the current resident cell is smaller than a third level threshold, and the measured received signal level value of the candidate cell is larger than a second level threshold.

In this embodiment, in the presence of the second comparison results corresponding to multiple candidate cells, the terminal reselects the candidate cell with the highest priority among the priorities of the frequency points corresponding to the multiple candidate cells.

In one embodiment, the performing cell reselection according to the first moving state includes:

determining a first signal quality value of a current resident cell according to a preset reselection hysteresis value and a first moving state; cell reselection is performed based on the first signal quality value.

The preset reselection hysteresis value refers to a preset reselection hysteresis value and a hysteresis parameter used for indicating the cell reselection decision, that is, used for adjusting the difficulty degree of cell reselection and reducing the repeated reselection condition of the terminal.

Illustratively, the candidate cell corresponds to the same frequency point as the cell where the terminal currently resides, and the candidate cell is a neighboring cell of the cell where the terminal currently resides. The terminal can obtain a preset reselection hysteresis value, determine a first signal quality value of a cell in which the terminal currently resides according to the preset reselection hysteresis value and the first moving state, and reselect the cell according to the first signal quality value.

In this embodiment, determining the first signal quality value of the currently camped cell according to the preset reselection hysteresis value and the first moving state includes:

and under the first uniform velocity moving state, the first deceleration moving state or the first acceleration moving state, obtaining the first signal quality value of the current resident cell according to a preset reselection hysteresis value.

In this embodiment, a first signal quality value of a currently camped cell is determined according to a preset reselection hysteresis value and a first moving state, so as to perform cell reselection based on the first signal quality value, and thus, the signal quality of the cell is used as a cell reselection condition, so as to reselect a cell with better quality.

In one embodiment, determining the first signal quality value of the currently camped cell according to the preset reselection hysteresis value and the first moving state comprises:

obtaining a first signal quality value of a current resident cell according to a preset reselection hysteresis value; compensating the first signal quality value according to the first movement state;

performing cell reselection based on the first signal quality value, comprising: performing cell reselection based on the compensated first signal quality value.

For example, the terminal may obtain a preset reselection hysteresis value, and determine the first signal quality value of the cell in which the terminal currently resides according to the preset reselection hysteresis value. The first signal quality value is compensated according to the first moving state to obtain a compensated first signal quality value. And the terminal performs cell reselection based on the compensated first signal quality value.

In this embodiment, when the first moving state is the second uniform moving state, the third uniform moving state, the second reduced moving state, the third reduced moving state, the second accelerated moving state, or the third accelerated moving state, the terminal compensates the first signal quality value according to the first moving state, and performs cell reselection based on the compensated first signal quality value.

In this embodiment, compensating the first signal quality value according to the first moving state includes:

in the second uniform motion state, compensating the first signal quality value according to a first offset value corresponding to the second uniform motion state to obtain a compensated first signal quality value in the second uniform motion state;

in the second speed reduction moving state, compensating the first signal quality value according to the first offset value corresponding to the second speed reduction moving state to obtain the compensated first signal quality value in the second speed reduction moving state;

and in the second acceleration moving state, compensating the first signal quality value according to the first bias value corresponding to the second acceleration moving state to obtain the compensated first signal quality value in the second acceleration moving state.

in a third uniform motion state, compensating the first signal quality value according to a second offset value corresponding to the third uniform motion state to obtain a compensated first signal quality value in the third uniform motion state;

in a third speed reduction moving state, compensating the first signal quality value according to a second offset value corresponding to the third speed reduction moving state to obtain a compensated first signal quality value in the third speed reduction moving state;

and in the third acceleration moving state, compensating the first signal quality value according to a second offset value corresponding to the third acceleration moving state to obtain the compensated first signal quality value in the third acceleration moving state.

In this embodiment, performing cell reselection based on the compensated first signal quality value includes:

the candidate cell is selected if the second signal quality value of the candidate cell is greater than the compensated first signal quality value.

In this embodiment, when the second signal quality value of the candidate cell is greater than the compensated first signal quality value, selecting the candidate cell includes:

and selecting the candidate cell under the condition that the second signal quality value of the candidate cell is greater than the compensated first signal quality value within the same frequency duration.

In this embodiment, the first signal quality value of the current resident cell is obtained according to the preset reselection hysteresis value, and the first signal quality value is compensated according to the first moving state, so that signal compensation can be performed in a targeted manner based on the moving state where the terminal is currently located, and cell reselection can be performed more accurately based on the compensated first signal quality value.

In one embodiment, performing cell reselection based on the first signal quality value comprises:

in the event that the second signal quality value of the candidate cell is greater than the first signal quality value, the candidate cell is selected.

For example, the terminal may obtain a second signal quality value of the candidate cell and compare the first signal quality value and the second signal quality value of the currently camped cell. The terminal reselects the candidate cell in the case that the second signal quality value of the candidate cell is greater than the first signal quality value.

In this embodiment, when the second signal quality value of the candidate cell is greater than the first signal quality value, the candidate cell is selected, so that a cell with better signal quality can be reselected.

In one embodiment, selecting the candidate cell in the event that the second signal quality value of the candidate cell is greater than the first signal quality value comprises:

the candidate cell is selected if the second signal quality value of the candidate cell is greater than the first signal quality value for the same frequency duration.

In this embodiment, in the same-frequency duration, the candidate cell is selected when the second signal quality value of the candidate cell is greater than the first signal quality value, so that a cell with better quality can be reselected when the signal quality of the candidate cell is greater than that of the cell in which the terminal currently resides within a certain time.

In one embodiment, the method further comprises:

and determining the same-frequency duration time according to the first moving state.

Illustratively, when the current resident cell and the candidate cell of the terminal correspond to the same frequency point, the same-frequency preset duration is set.

The first moving state is a first uniform moving state, a second uniform moving state, a third uniform moving state, a first deceleration moving state, a second deceleration moving state, a third deceleration moving state, a first acceleration moving state, a second acceleration moving state or a third acceleration moving state.

And under the first constant-speed moving state, the first speed-reducing moving state or the first accelerating moving state, the same-frequency duration is the same-frequency preset duration.

Under the second uniform movement state, the same-frequency duration is obtained according to the same-frequency preset duration and a first scaling factor corresponding to the second uniform movement state; under the second speed reduction moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a first scaling factor corresponding to the second speed reduction moving state; under the second accelerated moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a first scaling factor corresponding to the second accelerated moving state; the corresponding first scaling factors in the second uniform velocity moving state, the second deceleration moving state and the second acceleration moving state may be the same or different.

Under the third constant-speed moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a second scaling factor corresponding to the third constant-speed moving state; under the third speed reduction moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a second scaling factor corresponding to the third speed reduction moving state; in the third accelerated moving state, the same-frequency duration is obtained according to the same-frequency preset duration and a second scaling factor corresponding to the third accelerated moving state; the corresponding second scaling factors in the third uniform-speed moving state, the third deceleration moving state and the third acceleration moving state may be the same or different.

In this embodiment, the same-frequency duration is determined according to the first moving state, so that the same-frequency duration of the terminal in the current moving state can be determined in a targeted manner under the condition that the current resident cell of the terminal and the candidate cell correspond to the same frequency point, and thus the time condition that the terminal reselects the candidate cell in the current moving state is effectively adjusted, and the candidate cell is easier to reselect.

In one embodiment, the candidate cell corresponds to a current resident cell of the terminal at different frequency points, the candidate cell is a neighboring cell of the current resident cell, and the cell reselection is performed according to the first mobile state, including:

determining a pilot frequency duration according to the first moving state; and selecting the candidate cell under the condition that the measured received signal quality value of the candidate cell meets the signal quality threshold value in the pilot frequency duration.

Illustratively, when the current cell where the terminal resides and the candidate cell correspond to different frequency points, the pilot frequency preset duration is set. And the terminal determines the pilot frequency duration according to the first moving state and the pilot frequency preset duration.

The terminal may obtain a received signal quality value obtained by measuring the received signal quality of the candidate cell, and reselect the candidate cell by the terminal when the received signal quality value of the candidate cell satisfies a signal quality threshold within the pilot frequency duration.

In this embodiment, in the inter-frequency duration, the terminal reselects the candidate cell when the received signal quality value of the candidate cell is greater than the signal quality threshold.

In this embodiment, the first moving state is a first uniform moving state, a second uniform moving state, a third uniform moving state, a first speed-reducing moving state, a second speed-reducing moving state, a third speed-reducing moving state, a first acceleration moving state, a second acceleration moving state, or a third acceleration moving state.

In the first uniform velocity moving state, the first speed reduction moving state or the first acceleration moving state, the pilot frequency duration is the pilot frequency preset duration.

In the second uniform motion state, the pilot frequency duration is obtained according to the pilot frequency preset duration and a first scaling factor corresponding to the second uniform motion state; in the second speed reduction moving state, the pilot frequency duration is obtained according to the pilot frequency preset duration and a first scaling factor corresponding to the second speed reduction moving state; in the second accelerated moving state, the pilot frequency duration is obtained according to the pilot frequency preset duration and a first scaling factor corresponding to the second accelerated moving state; the corresponding first scaling factors in the second uniform velocity moving state, the second deceleration moving state and the second acceleration moving state may be the same or different.

In the third uniform movement state, the pilot frequency duration is obtained according to the pilot frequency preset duration and a second scaling factor corresponding to the third uniform movement state; in the third speed reduction moving state, the pilot frequency duration is obtained according to the pilot frequency preset duration and a second scaling factor corresponding to the third speed reduction moving state; in a third accelerated moving state, the pilot frequency duration is obtained according to the pilot frequency preset duration and a second scaling factor corresponding to the third accelerated moving state; the corresponding second scaling factors in the third uniform-speed moving state, the third deceleration moving state and the third acceleration moving state may be the same or different.

In this embodiment, in the case that the measured received signal quality value of the candidate cell satisfies the signal quality threshold within the inter-frequency duration, selecting the candidate cell includes:

and in the pilot frequency duration, selecting the candidate cell under the condition that the measured received signal quality value of the candidate cell meets the signal quality threshold and the reselection threshold parameter of the current resident cell is carried in the system message of the current resident cell configured by the network equipment.

In one embodiment, the signal quality threshold comprises a first quality threshold corresponding to the candidate cell, and the first quality threshold is configured under the condition that the priority of the frequency point of the candidate cell is higher than the priority of the frequency point of the current resident cell; selecting a candidate cell if the measured received signal quality value of the candidate cell meets a signal quality threshold for a pilot frequency duration, comprising:

and selecting the candidate cell under the condition that the measured received signal quality value of the candidate cell is greater than the first quality threshold value in the pilot frequency duration.

And selecting the candidate cell under the conditions that the priority of the frequency point of the candidate cell is higher than the priority of the frequency point of the current resident cell, the reselection threshold parameter of the current resident cell is carried in the system message of the current resident cell configured by the network equipment, the resident time of the terminal in the current resident cell exceeds the preset time, and the quality value of the received signal measured in the pilot frequency duration is greater than the first quality threshold.

In one embodiment, the signal quality threshold further includes a second quality threshold corresponding to the candidate cell and a third quality threshold corresponding to the currently camped cell. The second quality threshold and the third quality threshold are configured under the condition that the priority of the frequency point of the candidate cell is lower than the priority of the frequency point of the current resident cell; selecting a candidate cell if the measured received signal quality value of the candidate cell meets a signal quality threshold for a pilot frequency duration, comprising:

and in the pilot frequency duration, selecting the candidate cell under the condition that the measured received signal quality value of the current resident cell is smaller than a third quality threshold and the measured received signal quality value of the candidate cell is larger than a second quality threshold.

In this embodiment, the candidate cell is selected when the priority of the frequency point of the candidate cell is lower than the priority of the frequency point of the current resident cell, a reselection threshold parameter of the current resident cell is carried in a system message of the current resident cell configured by the network device, a resident duration of the current resident cell exceeds a preset duration, a received signal quality value of the current resident cell measured within a pilot frequency duration is smaller than a third quality threshold, and a received signal quality value of the candidate cell measured within the pilot frequency duration is larger than a second quality threshold.

In this embodiment, the pilot frequency duration is determined according to the first moving state, so that the reselection time when the cell where the terminal currently resides and the candidate cell correspond to different frequency points is adjusted based on the moving state of the terminal, and in the pilot frequency duration formed after adjustment, the candidate cell is selected under the condition that the measured received signal quality value of the candidate cell meets the signal quality threshold, so that the terminal can reselect the candidate cell more easily and can reselect the cell with better signal quality more quickly.

determining a pilot frequency duration according to the first moving state; and selecting the candidate cell under the condition that the measured receiving signal level value of the candidate cell meets the signal level threshold value in the pilot frequency duration.

Illustratively, when the current cell where the terminal resides and the candidate cell correspond to different frequency points, the pilot frequency preset duration is set. And the terminal determines the pilot frequency duration according to the first mobile state and the pilot frequency preset duration.

The terminal may obtain a received signal level value obtained by measuring a received signal level of the candidate cell, and reselect the candidate cell by the terminal in a case where the received signal level value of the candidate cell satisfies a signal level threshold value within the pilot duration.

In this embodiment, in the inter-frequency duration, the candidate cell is selected when the measured received signal level value of the candidate cell is greater than the signal level threshold.

In this embodiment, in the pilot frequency duration, selecting a candidate cell when a measured received signal level value of the candidate cell satisfies a signal level threshold includes:

and in the pilot frequency duration, selecting the candidate cell under the condition that the measured received signal level value of the candidate cell meets a signal level threshold value and a reselection threshold parameter of the current resident cell is carried in a system message of the current resident cell configured by the network equipment.

In one embodiment, the signal level threshold comprises a first level threshold corresponding to the candidate cell. The first level threshold is configured under the condition that the priority of the frequency point of the candidate cell is higher than the priority of the frequency point of the current resident cell; selecting a candidate cell when a measured received signal level value of the candidate cell satisfies a signal level threshold within a pilot frequency duration, comprising:

and selecting the candidate cell under the condition that the measured receiving signal level value of the candidate cell is greater than the first level threshold value in the pilot frequency duration.

And selecting the candidate cell under the conditions that the priority of the frequency point of the candidate cell is higher than the priority of the frequency point of the current resident cell, the reselection threshold parameter of the current resident cell is carried in the system message of the current resident cell configured by the network equipment, the resident time of the terminal in the current resident cell exceeds the preset time, and the received signal level value of the candidate cell is greater than the first level threshold.

In one embodiment, the signal level threshold includes a second level threshold corresponding to the candidate cell and a third level threshold corresponding to the currently camped cell. The second level threshold and the third level threshold are used when the priority of the frequency point of the candidate cell is lower than the priority of the frequency point of the current resident cell; selecting a candidate cell when a measured received signal level value of the candidate cell satisfies a signal level threshold within a pilot frequency duration, comprising:

and in the pilot frequency duration, the measured received signal level value of the current resident cell is smaller than a third level threshold value, and the measured received signal level value of the candidate cell is larger than a second level threshold value.

In this embodiment, the candidate cell is selected when the priority of the frequency point of the candidate cell is lower than the priority of the frequency point of the current resident cell, a reselection threshold parameter of the current resident cell is carried in a system message of the current resident cell configured by the network device, a resident time of the current resident cell exceeds a preset time, a received signal level value of the current resident cell measured within a pilot frequency duration is smaller than a third level threshold, and a received signal level value of the candidate cell measured within the pilot frequency duration is larger than a second level threshold.

In this embodiment, the pilot frequency duration is determined according to the first moving state, so that the reselection time when the cell where the terminal currently resides and the candidate cell correspond to different frequency points is adjusted based on the moving state of the terminal, and in the pilot frequency duration formed after adjustment, the candidate cell is selected under the condition that the received signal level value of the candidate cell obtained by measurement meets the signal level threshold, so that the terminal can reselect the candidate cell more easily.

In one embodiment, a cell reselection method is provided, including:

performing Doppler frequency offset estimation on a reference signal of a cell where the terminal currently resides to obtain the current acceleration and the current speed of the terminal;

determining a first moving state of the terminal according to the speed information of the terminal; the first moving state is a first uniform moving state, a second uniform moving state, a third uniform moving state, a first speed reduction moving state, a second speed reduction moving state, a third speed reduction moving state, a first acceleration moving state, a second acceleration moving state or a third acceleration moving state;

exemplarily, the terminal is in a first uniform moving state under the condition that the current acceleration is equal to 0 and the current speed is less than a first speed threshold value; or the like, or a combination thereof,

when the current acceleration is equal to 0 and the current speed is greater than or equal to the second speed threshold value, the terminal is in a third constant-speed moving state;

under the conditions that the current acceleration is less than 0, the current speed is greater than or equal to a third speed threshold value, and the current speed is less than a fourth speed threshold value, the terminal is in a second speed reduction moving state; or the like, or, alternatively,

under the conditions that the current acceleration is smaller than 0 and the current speed is larger than or equal to a fourth speed threshold value, the terminal is in a third speed reduction moving state;

under the condition that the current acceleration is greater than 0 and the current speed is less than a fifth speed threshold value, judging that the terminal is in a first acceleration moving state; or the like, or, alternatively,

under the conditions that the current acceleration is greater than 0, the current speed is greater than or equal to a fifth speed threshold value, and the current speed is less than a sixth speed threshold value, the terminal is in a second acceleration moving state; or the like, or, alternatively,

Optionally, in a first uniform velocity moving state, a first deceleration moving state, or a first acceleration moving state, obtaining a first signal quality value of the current resident cell according to a preset reselection hysteresis value; selecting a candidate cell under the condition that a second signal quality value of the candidate cell is greater than a first signal quality value within the same-frequency duration;

optionally, under the conditions of a second uniform motion state, a third uniform motion state, a second deceleration motion state, a third deceleration motion state, a second acceleration motion state or a third acceleration motion state, the terminal compensates the first signal quality value according to the first motion state to obtain a compensated first signal quality value; and selecting the candidate cell under the condition that the second signal quality value of the candidate cell is greater than the compensated first signal quality value within the same frequency duration.

Optionally, determining the pilot frequency duration according to the first moving state; selecting a candidate cell under the condition that the measured received signal quality value of the candidate cell meets a signal quality threshold within the pilot frequency duration;

optionally, determining the pilot frequency duration according to the first moving state; and selecting the candidate cell under the condition that the measured receiving signal level value of the candidate cell meets the signal level threshold value in the pilot frequency duration.

In one embodiment, the cell reselection method is applicable to a high speed train scenario. As shown in fig. 3, a specific process of cell reselection in a 5G HST (High Speed Train) scenario is shown.

The serving cell is a cell where the terminal UE currently resides, the adjacent cell is a candidate cell, which may also be referred to as an adjacent cell, and the network device is a base station.

The first part, the introduced related signaling configuration, includes steps 302 and 304:

step 302, a terminal UE capability indication is used to inform the network whether the UE supports enhanced RRM (Radio Resource Management) measurement requirements and whether the UE supports enhanced demodulation processing.

Illustratively, the terminal UE may add an IE (Information Element) highspeed parameters-r16{ measurement enhancement-r16, modulation enhancement-r16} or { intraRAT-measurement enhancement-r16, interfrrat-measurement enhancement-r16} in the reported capability message. Namely, a terminal UE supporting a 5G high-speed train scenario reports a supported radio access capability (capability) message in a process of registering a base station, where the capability message includes a high speed measurement identifier highSpeedParameters-r16. And after receiving the capability message reported by the UE, the base station performs the configuration of (2) according to the reported high-speed measurement identifier highSpeedParameters-r16.

In step 304, the network indicates whether the UE needs to apply the enhanced measurement requirement to the corresponding carrier. Exemplarily, the base station adds high-speed RRC (Radio Resource Control) parameters highSpeedMeasFlag-r16 and highSpeedDemodFlag-r16 in serving cell system broadcast messages IE ServingCellConfigCommon and IE ServingCellConfigCommon sib; the highspeedeutrararrier-r 16 is added to the inter-system adjacent channel configuration system message IE carrierFreqListEUTRA-v16 xy.

Step 306, judging whether the terminal meets the requirement of common-frequency measurement, namely judging whether highSpeedMeasFlag-r16 is configured and whether UE supports measurementEnhance-r 16 or not

IntraRAT-measurementenevaluation-r 16. If yes, executing step 310, and step 318; if not, the normal measurement schedule of step 312 is performed.

Step 308, determining whether the terminal meets the requirement of inter-frequency measurement, that is, determining whether the highSpeedMeasFlag-r16 is configured and whether the UE supports measurementennessr 16 or not

interRAT-measurementenevaluation-r 16, and whether Srxlev < SnonIntraSearchP or Squal < SnonIntraSearchQ is satisfied, and whether highSpeedeUTERTRACarrier-r 16 is configured under the inter-system frequency point. If yes, go to step 314, and step 318; if not, go to step 312.

The second part, scheduling of measurements, is as follows:

when the terminal supports a high-speed train scene and receives a measurement requirement indication that the network requires to apply enhancement, the terminal executes the following operations: the terminal reduces the corresponding measurement scheduling period of the corresponding frequency points, accelerates the measurement of the frequency points and performs demodulation enhancement. The method specifically comprises the following steps 310-314:

step 310, for common frequency measurement, accelerated measurement scheduling, T _{detect,NR_Intra} (cell detection period), T _{measure,NR_Intra} (cell measurement period) and T _{evaluate,NR_Intra} (cell evaluation period), the following table i can be referred to. TABLE T for UE configured with highSpeedMeasFlag-r16 _{detect,NR_Intra} 、T _{measure,NR_Intra} And T _{evaluate,NR_Intra} The measurement scheduling can be accelerated.

Watch 1

In step 312, for inter-system measurements, if the serving cell signal is better than the threshold (i.e., srxlev)>S _{nonIntraSearchP} And Squal>S _{nonIntraSearchQ} ) Regardless of the high speed measurement identifier highSpeedMeasFlag-r16 or

If the highSpeedEUTRACarrier-r16 has configuration, the normal scheduling is still performed in the measurement scheduling period.

Step 314, if the serving cell' S signal is not good (i.e. Srxlev ≦ S) _{nonIntraSearchP} Or Squal is less than or equal to S _{nonIntraSearchQ} ) Then accelerated measurement scheduling is needed, i.e. accelerated measurement scheduling according to table two.

Cell selection RX level value (dB) is used for representing a receiving signal level value selected by a Cell.

Cell selection quality value (dB) for indicating the received signal quality value for Cell selection.

S _{nonIntraSearchP} The Srxlev threshold (unit: dB) of NR cross-frequency and cross-RAT measurement is specified and used for indicating the Srxlev threshold for starting different system measurement.

S _{nonIntraSearchQ} This specifies the Squal threshold (in dB) for NR cross-frequency and cross-RAT measurements, which is used to indicate the Squal threshold for turning on inter-system measurements.

TABLE for UE with highSpeedMeasFlag-r16 configured, T _{detect,EUTRAN_HST} 、T _{measure,EUTRAN_HST} And T _{evaluate,EUTRAN_HST} The measurement scheduling can be accelerated.

Watch two

After step 310, step 312 and step 314, step 316 is performed.

The third part, reselection evaluation of the cell, includes steps 316-326:

in step 316, the physical layer reports the measured cell to layer 3 (i.e. AS layer: access Stratum, access Stratum), and after filtering, layer 3 evaluates the cell reselection according to the relevant reselection configuration in the system message, and screens out the cell that can be used for reselection.

In step 324, the access stratum performs reselection evaluation:

(1) The UE should be at least at every T _measure And measuring SS-RSRP or SS-RSRQ of the corresponding frequency point in time. The UE should filter the SS-RSRP/SS-RSRQ measurements of each measured neighbor cell using at least 2 measurements. Within a set of measurements for filtering, the separation of two measurements should be at least T _measure /2. If T is _reselection The timer has a non-zero value and the neighbor cell satisfies the reselection criterion, then the UE should evaluate the T of the neighbor cell _reselection Time. If the cell still meets the reselection criteria for this duration, the cell is a cell suitable for reselection.

(2) Depending on the mobility state of the terminal, the parameters in the reselection criteria need to be scaled appropriately to expedite reselection. For example, if the UE is determined to be in a medium/high-speed moving state, when calculating the R value used by the serving cell for reselection evaluation, one offset is added to the hysteresis value Qhyst (as q-HystSF, the network configuration is not positive), that is, the signal of the neighbor cell may be relaxed to satisfy the reselection condition, and the signal of the neighbor cell may be relaxed by 6dB at most. T of reselecting frequency point of same-frequency and different-frequency systems _reselection The value is multiplied by a scale (such as SpeedStateScaleFactors) to be reduced properly, namely, the time for satisfying the signal intensity of the neighbor cell is shorter, and the time duration can be shortened by 3/4 at most. E.g. T of network configuration _reselection Can be 1 second, 2 seconds, \ 8230;, 7 seconds; the scale factor network can be configured to range from 0.25,0.5,0.75,1. If the network is configured for 6 seconds, the zoom factor is 0.25 in the high-speed moving state, the zoom factor is 0.75 in the medium-speed moving state, and the zoom is not performed in the low-speed moving state. If the moving state is judged to be correct, the adjacent cell signal meeting the condition in the high-speed moving state only needs to be continued for 6 × 0.25= 1.25s; if the high-speed moving state is mistakenly judged as the medium-speed moving state, the neighbor cell signalsNo. fulfilment of the condition requires 6 × 0.75=4.5s; if the high-speed moving state is wrongly judged as the low-speed moving state, the adjacent cell signal meeting the condition needs to be continued for 6s, and the pair of T _reselection The final calculated value will be very erroneous. In an actual scene, the speed per hour of a high-speed train can reach 500km/h, the train can be driven out for 138.89m within 1s, and the influence is serious after misjudgment.

Generally, the higher the speed, the greater the ratio of widening and narrowing. Specific IEs are described as follows:

namely, the first bias value is { dB-6, dB-4, dB-2, dB0}, and the second bias value is { dB-6, dB-4, dB-2, dB0};

parameters in the reselection criteria include SpeedStateScaleFactors and MobilityStateParameters; the IE SpeedStateScaleFactors refer to factors for scaling mobility control-related parameters when the UE is in a medium or high speed mobility state. Specific IEs are described as follows:

that is, the SpeedStateScaleFactors (i.e., the first scaling factor sf-Medium) in the Medium-speed movement state may be 0.25,0.5,0.75, or 1; the SpeedStateScaleFactors (i.e., the second scaling factor sf-High) in the High-speed movement state may be 0.25,0.5,0.75, or 1.

The IE MobilityStateParameters means that the IE mobility state parameters include parameters for determining the UE mobility state, and specifically may include acceleration and velocity.

The 5G adopts the OFDM technology, and in a high-speed train scene, the higher the moving speed of a train is, the larger the frequency change (Doppler frequency shift) is, serious inter-carrier interference can be brought, the orthogonality among carriers can be damaged, and the performance of a receiving system at a receiving end is influenced. Therefore, doppler frequency offset estimation and enhanced doppler frequency offset estimation are important processes in high-speed scenarios. Since the doppler shift is proportional to the velocity, the receiver can estimate the velocity and acceleration by performing doppler shift estimation on the reference signal. Due to the very good built-in correlation properties of the PSS and SSS signals of the synchronization signals, accurate time of arrival (TOA) and angle of departure (AOD) measurements are allowed. The position, velocity and acceleration of the train can be tracked by using the SS as a reference signal. As shown in fig. 4, the received reference signal is sampled, and the sampling information is input to a channel estimator (channel estimator) to estimate channel parameters, and the channel parameters are input to a strongest path searcher (Selector for path). The strongest path searcher counts average power or instantaneous power in channel parameters, selects the strongest path to carry out Frequency offset estimation (Frequency shift estimation), and carries out Frequency offset correction (Frequency shift correction) on speed and acceleration obtained by Frequency offset estimation so as to output final speed and acceleration through Adaptive receiving applications (Adaptive receiving applications) in the terminal.

The judgment of the terminal moving state comprises steps 318-322:

in step 318, when there is a measurement schedule related to the frequency point of the high-speed train, the physical layer may add a speed estimation module and inform the layer 3 of the current speed V and the acceleration a when performing doppler frequency offset estimation, and at the same time, the terminal may set two speed-related medium and high speed threshold values Vmedium, vhigh, and a speed offset Voffset.

In step 320, the reported current acceleration a, the current speed V, the speed threshold values Vmedium, vhigh, the speed offset Voffset, and the like are compared.

The UE mobility state is determined according to step 322:

the current acceleration a =0 (when the train is at a constant speed, i.e. in a constant-speed moving state):

low-speed moving state, namely first constant-speed moving state: the reported current speed V < Vmedium;

the medium-speed moving state, namely the second constant-speed moving state: the reported current speed Vmedium = < V < = Vhigh;

high-speed moving state, i.e. third uniform moving state: the reported current speed V is greater than Vhigh.

Acceleration a <0 (deceleration of the train, i.e., in a deceleration moving state):

low-speed movement state, i.e., first deceleration movement state: the reported current speed V < Vmedium + Voffset;

medium speed moving state, i.e. second deceleration moving state: reporting the current speed Vmedium + Voffset = < V < = Vhigh + Voffset;

high-speed movement state, i.e., third deceleration movement state: and the reported current speed V is greater than Vhigh + Voffset.

Acceleration a >0 (train acceleration, i.e. in an accelerated moving state):

low-speed movement state, i.e., first acceleration movement state: the reported current speed V < Vmedium-Voffset;

medium-speed moving state, i.e., second accelerated moving state: reporting the current speed Vmedium-Voffset = < V < = Vhigh-Voffset;

high-speed movement state, i.e., third acceleration movement state: and the reported current speed V is greater than Vhigh-Voffset.

Wherein Vmedium is a first speed threshold, vhigh is a second speed threshold, vmedium + Voffset is a third speed threshold, vhigh + Voffset is a fourth speed threshold, vmedium-Voffset is a fifth speed threshold, vhigh-Voffset is a sixth speed threshold, and Voffset is a predetermined speed offset.

Fig. 5 is a schematic flow chart of the moving state determination in the present embodiment.

The current speed V and the current acceleration a are obtained, and the first speed threshold value Vmedium, the second speed threshold value Vhigh and the preset speed offset value Voffset are read.

Judging whether the acceleration a is equal to 0 or not; and a =0, judging whether the current speed V is less than a first speed threshold value Vmedium, if V < Vmedium, judging the current speed V to be in a low-speed moving state, namely a first constant-speed moving state, otherwise, judging whether Vmedium = < V < = Vhigh exists, if yes, judging the current speed V to be in a medium-speed moving state, namely a second constant-speed moving state, and if V > Vhigh, judging the current speed V to be in a high-speed moving state, namely a third constant-speed moving state.

If a is not equal to 0, judging whether the acceleration a is less than 0; and a <0, determining whether V < (Vmedium + Voffset) exists, if so, determining the low-speed moving state, namely the first speed-reducing moving state, if (Vmedium + Voffset) = < V < = (Vhigh + Voffset), determining the medium-speed moving state, namely the second speed-reducing moving state, and if not, determining the high-speed moving state, namely the third speed-reducing moving state, if not, indicating V > (Vhigh + Voffset).

If a is not less than 0, it means a >0, it is determined whether V < (Vmedium-Voffset) is present, and if yes, it is determined as the low-speed movement state, that is, the first acceleration movement state, if (Vmedium-Voffset) = < V < = (Vhigh-Voffset), it is determined as the medium-speed movement state, that is, the second acceleration movement state, and if not, it is determined as the high-speed movement state, that is, the third acceleration movement state.

In step 324, the access stratum performs reselection evaluation, which specifically includes:

when reselection evaluation is performed after the moving state of the terminal is obtained, scaling is not performed when reselection evaluation is performed in a low-speed moving state, that is, an offset value and a scaling factor are not used in a first constant-speed moving state, a first speed-reducing moving state and a first accelerating moving state.

When reselection evaluation is performed in a Medium-speed mobile state, a preset reselection hysteresis value q-Hyst of a serving cell needs to be added with a first bias value sf-Medium1 configured in a scaling condition q-HystSF and then used for calculating a criterion, and a preset duration Treselection needs to be multiplied with a first scaling factor sf-Medium2 configured in SpeedStateScaleFactors at a corresponding frequency point and then used for calculating the criterion.

When reselection evaluation is performed in a High-speed mobile state, a preset reselection hysteresis value q-Hyst of a serving cell needs to be added with a second bias value sf-High1 configured in a scaling condition q-HystSF and then used for calculating a criterion, and a preset duration Treselection needs to be multiplied with a second scaling factor sf-High2 configured in speedstatescalectors at a corresponding frequency point and then used.

Illustratively, cell reselection may be performed by S-criteria and R-criteria. The formula of the S criterion is as follows:

received signal level value: srxlev = Q _rxlevmeas –(Q _rxlevmin +Q _{rxlevminoffset} )–P _compensation -Qoffset _temp

Received signal quality value: squal = Q _qualmeas –(Q _qualmin +Q _{qualminoffset} )-Qoffset _temp

Wherein Q is _rxlevmeas The received signal level value representing the candidate cell, i.e. the reference signal received power, RSRP, Q _rxlevmin Representing the minimum received signal level (dBm) required for the candidate cell. If the UE supports the SUL frequency of the candidate cell, Q is obtained from Q-RxLevMinSUL in SIB1, SIB2, and SIB4 _rxlevmin Furthermore, if there is Q of the relevant cell in SIB3 and SIB4 _rxlevmin offset cellsul, a specific offset of the candidate cell is added to the corresponding Q _rxlevmin To achieve the minimum received signal level required by the relevant cell. Otherwise, Q _rxlevmin Obtained from Q-RxLevmin in SIB1, SIB2 and SIB4, and further, if Q is present in SIB3 and SIB4 of the relevant cell _{rxlevminoffsetcell} Then the specific offset of the cell is added to the corresponding Q _rxlevmin To achieve the minimum received signal level required by the correlation unit.

Q _{rxlevminoffset} Representing the signal Q considered in the Srxlev evaluation _rxlevmin The offset of (c). P is _compensation A compensation amount representing a signal level; qoffset _temp An offset (dB) temporarily applied to one cell, i.e., a temporary offset, is indicated.

Q _qualmeas Indicating a received signal quality value of a candidate cell, i.e. RSRQ, Q _qualmin Representing the minimum required quality level (dB) for the candidate cell. If Q _qualmin An offsetcell signals the relevant cell, then the specific offset for that cell will be added to achieve the minimum quality level requirement for the relevant cell. Q _{qualminoffset} Representing the signal Q considered in the Squal evaluation _qualmin The amount of offset of (c).

Same-frequency cell reselection standard: r criterion, the formula of the R criterion is as follows:

serving cell R _s The value calculation formula is: r is _s ＝Q _meas,s +Q _hyst -Qoffset _temp

Same frequency cell R _n The value calculation formula is: r _n ＝Q _meas,n -Qoffset-Qoffset _temp

The same-frequency cell is a candidate cell corresponding to the same frequency point as the serving cell, and the serving cell is a cell where the terminal currently resides. R is _s First signal quality value, R, representing a serving cell _n A second signal quality value indicative of an intra-frequency cell; q _meas A measurement of reference signal received power, RSRP, representative of cell reselection; q _hyst Represents a reselection hysteresis value; qoffset denotes an offset, i.e., an offset value, between the serving cell and the candidate cell; qoffset _temp Indicating a temporary application offset when connection establishment fails.

In the serving cell R _s In the calculation of the value, the hysteresis value Q is reselected _hyst Influenced by the first moving state of the terminal, the reselection hysteresis value Q is in the first uniform moving state, the first deceleration moving state and the first acceleration moving state _hyst The hysteresis value is reselected for a preset value. In a second uniform motion state, a second deceleration motion state and a second acceleration motion state, the reselection hysteresis value Q _hyst Is the sum of a preset reselection hysteresis value and a first offset value. In a third uniform motion state, a third deceleration motion state and a third acceleration motion state, the reselection hysteresis value Q _hyst Is the sum of the preset reselection hysteresis value and the second offset value.

After the respective R values of the service cell and the common-frequency cell are calculated, whether the common-frequency cell is reselected can be judged, and when the following conditions are met, the terminal reselects the common-frequency cell:

1) The terminal resides for more than 1 second in the current service cell;

2) The S value (S value comprises Srxlev and Squal) of the co-frequency cell meets Srxlev >0 and Squal >0;

3) Same frequency cell R _n >R _s Same frequency duration Treselection satisfying base station configuration _NR I.e. at the same frequency duration Treselection _NR In each case there is R _n >R _s 。

And when a plurality of same-frequency cells meet the conditions, the terminal reselects the same-frequency cell with the maximum R value in the plurality of same-frequency cells.

In this embodiment, the same frequency duration Treselection _NR Determined according to a first mobility state of the terminal. And when the mobile terminal is in the first constant-speed moving state, the first deceleration moving state and the first acceleration moving state, the same-frequency duration is the same-frequency preset duration. In a second uniform velocity moving state, a second deceleration moving state and a second acceleration moving state, the same frequency duration Treselection _NR The product of the same frequency preset duration and the first scaling factor. In a third uniform velocity moving state, a third deceleration moving state and a third acceleration moving state, the same frequency duration Treselection _NR According to the product of the same-frequency preset duration and the second scaling factor.

When the serving cell and the candidate cell correspond to different frequency points, the cell reselection can be performed by using the inter-system cell reselection standard, and when any one of the following conditions A), B), C) and D) is met, the terminal reselects the candidate cell:

the inter-system cell is a candidate cell corresponding to different frequency points with the serving cell, and comprises a high priority cell reselection and a low priority cell reselection.

(1) The reselection of the high priority cell, namely the priority of the frequency point of the different system cell is higher than the priority of the frequency point of the service cell, includes:

a) The serving cell system message carries a current resident cell reselection threshold parameter threshServiningLowQ parameter; and is provided with

At pilot frequency duration Treselection _RAT Inner and different system cell Squal>Thresh _X,HighQ (ii) a And is

The UE resides in the current cell for more than 1 second, srxlev >0 and Squal >0;

b) The serving cell system message does not carry the threshServinLowQ parameter; and is

At pilot frequency duration Treselection _RAT Small inter-systemRegion Srxlev>Thresh _X,HighP (ii) a And is

The UE stays in the current cell for more than 1 second, srxlev >0 and Squal >0;

(2) The low priority cell reselection, that is, the priority of the frequency point of the candidate cell is lower than that of the frequency point of the serving cell, includes:

c) The serving cell system message carries a threshServinLowQ parameter; and is

In Treselection _RAT Serving cell satisfying Squal within time<Thresh _Serving,LowQ And the inter-system cell satisfies Squal>Thresh _X,LowQ (ii) a And is

d) The serving cell system message does not carry the threshServinLowQ parameter; and is

In Treselection _RAT Serving cell meeting Srxlev within time<Thresh _Serving,LowP And the different system cell satisfies Srxlev>Thresh _X,LowP (ii) a And is

The UE is camped on the current cell for more than 1 second, srxlev >0 and Squal >0.

Wherein, thresh _X,HighQ And configuring a first quality threshold when the priority of the frequency point of the different system cell is higher than the priority of the frequency point of the service cell.

Thresh _X,HighP And configuring a first level threshold when the priority of the frequency point of the different system cell is higher than that of the frequency point of the service cell.

Thresh _X,LowQ And the second quality threshold value is configured for the different system cell under the condition that the priority of the frequency point of the different system cell is lower than the priority of the frequency point of the service cell.

Thresh _Serving,LowQ And the third quality threshold value is configured for the serving cell when the priority of the frequency point of the inter-system cell is lower than the priority of the frequency point of the serving cell.

Thresh _X,LowP Indicating that in the case that the frequency point of the inter-system cell has a lower priority than the frequency point of the serving cell,a second level threshold configured for the inter-system cell.

Thresh _Serving,LowP And the third level threshold value is configured for the serving cell when the priority of the frequency point of the inter-system cell is lower than the priority of the frequency point of the serving cell.

In this embodiment, pilot frequency duration Treselection _RAT Determined according to a first mobility state of the terminal. And when the mobile terminal is in the first constant-speed moving state, the first speed-reducing moving state and the first accelerating moving state, the pilot frequency duration is the pilot frequency preset duration. In a second uniform velocity moving state, a second deceleration moving state and a second acceleration moving state, the pilot frequency duration Treselection _RAT The product of the pilot frequency preset duration and the first scaling factor. In a third uniform velocity moving state, a third deceleration moving state and a third acceleration moving state, the pilot frequency duration Treselection _RAT According to the product of the pilot preset duration and the second scaling factor.

And when a plurality of different system cells meet the condition, the terminal reselects the different system cell with the highest priority.

After performing the reselection evaluation in step 324, if there is a candidate cell satisfying the reselection condition, the terminal reselects from the currently camped cell to the candidate cell.

In this embodiment, according to the network deployment characteristics of the private network of the high-speed train, after the terminal determines that there is a frequency point measurement and scheduling of the high-speed train, the acceleration estimation module calculates the current speed and acceleration and reports the calculated current speed and acceleration to the access layer during the doppler frequency offset estimation of the physical layer, so that the access layer determines the obtained speed and acceleration and the set medium-high speed threshold and speed offset, and can accurately know the moving state of the current terminal in real time, and further perform appropriate scaling during reselection evaluation, thereby accelerating the speed of cell reselection. The cell reselection method of the embodiment can effectively avoid the situation that the mobile state is misjudged by judging the reselection times in the HST scene in the traditional scheme, and ensures the successful reselection.

In one embodiment, an experimental scenario of a cell reselection method is provided, as shown in fig. 6. Assuming that the distance between BBUs (Base Band units) of the gNB is 500m, the transmission power of two adjacent cells is consistent, 12 RRUs (Remote Radio units) under one BBU share the same cell ID, the overlapping coverage distance is 80m, and the coverage range of one BBU is approximately 6km. The terminal can detect the adjacent cell at the initial side of the overlapping coverage, the length of a train is 8 cars, the length of the train is 214m, the speed is 350km/h =97.222m/s, and the time consumed by the train passing through the overlapping coverage area at the speed is about 80 m/(350 km/h) =0.8229s;

1) And under the laboratory environment of a simulated high-speed train environment, setting 12 RRUs below one BBU to share the same cell ID, wherein if different BBUs share frequency points but the cell IDs are different, the coverage range of one BBU is approximately 6km, and the time taken for a terminal to pass through the coverage at the maximum speed is approximately 6/350 × 3600s =61.714s.

2) The Vmedium in the mobile phone registry registration is set to 120km/h, vhigh is set to 300km/h (the high-speed train speed supported by LTE and the high-speed train speed supported by NR specified in 3GPP are set to 500 km/h), and Voffset may be temporarily set to 0.

3) The relevant configuration of the base station is set as follows, the t-Evaluation of the mobility state parameter of the mobility state parameters in the system message) takes the minimum value of 30s, the t-hystNormal takes the minimum value of 30s, the n-CellChangMedium takes the minimum value of 1, and the n-CellChangHigh is 3. Taking the minimum value is misjudgment, and taking other values is misjudgment.

4) Setting an RRM measurement time configuration window (called SMTC window) of a serving cell SMTC (synchronous Signal Block based), where a measurement period and time of SSBs obtained by a mobile phone through the SMTC are set to be 2 ms, drx (Discontinuous Reception/Discontinuous Reception mechanism) period is set to be 320ms, an offset value corresponding to sf-Medium configured in q-HystSF is-2db, an offset value corresponding to sf-High is-4db, a scaling factor corresponding to sf-Medium configured in speedstatescalefactors is 0.5, and a scaling factor corresponding to sf-High is 0.25. Reselecting related parameters of the same-frequency cells, calculating the R value when the minimum access level is consistent with that of the serving cellThe off offset parameters are all set to 0. Same frequency preset duration t _Reselection The minimum value of the non-zero value is 1s, and the improvement effect of other values is more obvious.

A schematic diagram of the points in time at which reselection is roughly scheduled can be calculated according to the above configuration is shown in fig. 6: the terminal can detect the adjacent cell and start to measure the adjacent cell at the overlapping coverage starting side, and can evaluate after 2 continuous measurement results filters. For 2), if scaling is not performed during evaluation in the conventional scheme, the measurement result of the cell 2 needs to continuously satisfy 1s for reselection, and at this time, the terminal has already moved out of the coverage of the cell 1, a network drop occurs, and cell selection starts. According to the cell reselection of the embodiment, the terminal can be judged to be in a high-speed moving state, and the second offset value 4dB can be subtracted from the reselection hysteresis value Qhyst when the R value of the serving cell is calculated _Reselection And scaling to 1s × 0.25=0.25ms, the terminal may timely reselect to the cell 2 when the terminal satisfies the reselection time requirement at the time point when the reference signal received power RSRP and the reference signal received quality RSRQ of the cell 2 are measured for the third time.

When the terminal supports the high-speed train mode and is in an LTE high-speed train scene, the reselection process also needs to judge the moving state of the current terminal to appropriately scale reselection evaluation so as to accelerate reselection, and also needs to scale the forecast triggering time according to the moving state of the current terminal so as to accelerate handover when the cell is switched. Therefore, the cell reselection method in this embodiment may also be applied to a reselection and handover procedure in an LTE high-speed train scenario, a handover procedure in a 5G high-speed train scenario, and any scenario in which a mobile state of a terminal needs to be determined and a determination result is applied.

It should be understood that, although the steps in the flowcharts related to the embodiments described above are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.

Based on the same inventive concept, the embodiment of the present application further provides a cell reselection apparatus for implementing the above-mentioned cell reselection method. The implementation scheme for solving the problem provided by the apparatus is similar to the implementation scheme described in the above method, so specific limitations in one or more embodiments of the cell reselection apparatus provided below may refer to the above limitations on the cell reselection method, and details are not described herein again.

In one embodiment, as shown in fig. 7, there is provided a cell reselection apparatus 700, comprising: a determination module 702 and a reselection module 704, wherein:

a determining module 702, configured to determine a first moving state of the terminal according to the speed information of the terminal.

A reselection module 704 configured to perform cell reselection according to the first moving state.

In the embodiment, the first moving state of the terminal is determined according to the speed information of the terminal, and the acquired speed information is not affected by the current resident cell of the terminal, so that the moving state of the terminal can be accurately and quickly judged according to the speed information. And cell reselection is carried out according to the first moving state, and the cell reselection can be accurately and quickly carried out under the moving state of the terminal, so that a cell with better signal quality is reselected.

In one embodiment, the apparatus further comprises an estimation module; and the estimation module is used for performing Doppler frequency offset estimation on the reference signal of the cell in which the terminal currently resides to obtain the speed information of the terminal.

In this embodiment, the current acceleration and/or the current speed of the terminal is used as the speed information of the terminal, the moving state of the terminal can be accurately determined according to the current acceleration and/or the current speed, and the moving state of the terminal can be more accurately determined without being affected by the current residential cell.

In an embodiment, the determining module 702 is further configured to, when the current acceleration is equal to 0 and the current speed is less than the first speed threshold, enable the terminal to be in a first uniform moving state; or the like, or, alternatively,

under the conditions that the current acceleration is equal to 0, the current speed is greater than or equal to a first speed threshold value, and the current speed is less than a second speed threshold value, the terminal is in a second uniform moving state; or, the terminal is in a third uniform moving state under the condition that the current acceleration is equal to 0 and the current speed is greater than or equal to the second speed threshold value.

In one embodiment, the determining module 702 is further configured to, when the current acceleration is less than 0 and the current speed is less than the third speed threshold, enable the terminal to be in a first speed reduction moving state; or the like, or, alternatively,

under the conditions that the current acceleration is less than 0, the current speed is greater than or equal to a third speed threshold value and the current speed is less than a fourth speed threshold value, the terminal is in a second speed reduction moving state; or, the terminal is in a third speed-reducing moving state under the condition that the current acceleration is less than 0 and the current speed is greater than or equal to a fourth speed threshold value.

In one embodiment, the determining module 702 is further configured to determine that the terminal is in the first acceleration moving state when the current acceleration is greater than 0 and the current speed is less than the fifth speed threshold; or, under the condition that the current acceleration is greater than 0, the current speed is greater than or equal to the fifth speed threshold value, and the current speed is less than the sixth speed threshold value, the terminal is in a second acceleration moving state; or, the terminal is in the third accelerated moving state under the condition that the current acceleration is greater than 0 and the current speed is greater than or equal to the sixth speed threshold value.

In one embodiment, the candidate cell corresponds to the same frequency point as the current resident cell of the terminal, and the candidate cell is a neighboring cell of the current resident cell, and the reselection module 704 is further configured to determine a first signal quality value of the current resident cell according to a preset reselection hysteresis value and a first mobility state; cell reselection is performed based on the first signal quality value.

In this embodiment, according to the preset reselection hysteresis value and the first moving state, the first signal quality value of the currently camped cell is determined, so as to perform cell reselection based on the first signal quality value, and thus the signal quality of the cell is used as a cell reselection condition, so as to reselect a cell with better quality.

In an embodiment, the reselection module 704 is further configured to obtain a first signal quality value of the currently camped cell according to a preset reselection hysteresis value; compensating the first signal quality value according to the first movement state; performing cell reselection based on the compensated first signal quality value.

In one embodiment, the reselection module 704 is further configured to select the candidate cell if the second signal quality value of the candidate cell is greater than the first signal quality value.

In one embodiment, the reselection module 704 is further configured to select the candidate cell if the second signal quality value of the candidate cell is greater than the first signal quality value for the same frequency duration.

In one embodiment, the reselection module 704 is further configured to select the candidate cell if the second signal quality value of the candidate cell is greater than the compensated first signal quality value.

In one embodiment, the reselection module 704 is further configured to select the candidate cell if the second signal quality value of the candidate cell is greater than the compensated first signal quality value for the same frequency duration.

In one embodiment, the apparatus further comprises a time determination module configured to determine a same frequency duration according to the first movement state.

In an embodiment, the candidate cell corresponds to a current resident cell of the terminal at different frequency points, and the candidate cell is a neighboring cell of the current resident cell, and the reselection module 704 is further configured to determine a pilot frequency duration according to a current speed of the terminal; and selecting the candidate cell under the condition that the measured received signal quality value of the candidate cell meets the signal quality threshold value in the pilot frequency duration.

In an embodiment, the candidate cell corresponds to a current resident cell of the terminal at different frequency points, and the candidate cell is a neighboring cell of the current resident cell, and the reselection module 704 is further configured to determine the pilot frequency duration according to the current speed of the terminal; and selecting the candidate cell under the condition that the measured receiving signal level value of the candidate cell meets the signal level threshold value in the pilot frequency duration.

The modules in the cell reselection device may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 8. The computer apparatus includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input device. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The input/output interface of the computer device is used for exchanging information between the processor and an external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is for implementing a method of cell reselection when executed by a processor. The display unit of the computer device is used for forming a visual visible picture, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 8 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of a cell reselection method.

Embodiments of the present application also provide a computer program product containing instructions that, when run on a computer, cause the computer to perform a cell reselection method.

It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data need to comply with the relevant laws and regulations and standards of the relevant country and region.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include a Read-Only Memory (ROM), a magnetic tape, a floppy disk, a flash Memory, an optical Memory, a high-density embedded nonvolatile Memory, a resistive Random Access Memory (ReRAM), a Magnetic Random Access Memory (MRAM), a Ferroelectric Random Access Memory (FRAM), a Phase Change Memory (PCM), a graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the various embodiments provided herein may be, without limitation, general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, or the like.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A method of cell reselection, comprising:

and performing cell reselection according to the first moving state.

2. The method of claim 1, further comprising:

and performing Doppler frequency offset estimation on a reference signal of the current resident cell of the terminal to obtain the speed information of the terminal.

3. Method according to claim 1 or 2, characterized in that the velocity information comprises the current acceleration and/or the current velocity of the terminal.

4. The method of claim 3, wherein the first mobility state is one of a plurality of mobility states; the acceleration and/or velocity of any two of the plurality of movement states are different.

5. The method according to claim 3, wherein the determining the first moving state of the terminal according to the speed information of the terminal comprises:

when the current acceleration is equal to 0, the current speed is greater than or equal to the first speed threshold value, and the current speed is less than a second speed threshold value, the terminal is in a second uniform moving state; or the like, or a combination thereof,

and when the current acceleration is equal to 0 and the current speed is greater than or equal to the second speed threshold value, the terminal is in a third uniform moving state.

6. The method of claim 3, wherein determining the first mobility state of the terminal according to the velocity information of the terminal comprises:

under the condition that the current acceleration is smaller than 0 and the current speed is smaller than a third speed threshold value, the terminal is in a first speed reduction moving state; or the like, or a combination thereof,

when the current acceleration is smaller than 0, the current speed is larger than or equal to the third speed threshold value, and the current speed is smaller than a fourth speed threshold value, the terminal is in a second speed reduction moving state; or the like, or a combination thereof,

and under the condition that the current acceleration is less than 0 and the current speed is greater than or equal to the fourth speed threshold value, the terminal is in a third speed reduction moving state.

7. The method according to claim 3, wherein the determining the first moving state of the terminal according to the speed information of the terminal comprises:

when the current acceleration is larger than 0 and the current speed is smaller than a fifth speed threshold value, judging that the terminal is in a first acceleration moving state; or the like, or, alternatively,

when the current acceleration is greater than 0, the current speed is greater than or equal to the fifth speed threshold value, and the current speed is less than a sixth speed threshold value, the terminal is in a second acceleration moving state; or the like, or a combination thereof,

and under the condition that the current acceleration is greater than 0 and the current speed is greater than or equal to the sixth speed threshold value, the terminal is in a third acceleration moving state.

8. The method according to claim 1, wherein a candidate cell corresponds to a same frequency point as a cell where the terminal currently resides, the candidate cell is a neighboring cell of the currently residing cell, and the performing cell reselection according to the first moving state includes:

determining a first signal quality value of the current resident cell according to a preset reselection hysteresis value and the first moving state;

performing cell reselection based on the first signal quality value.

9. The method of claim 8, wherein determining the first signal quality value of the currently camped cell according to a preset reselection hysteresis value and the first mobility state comprises:

obtaining a first signal quality value of the current resident cell according to a preset reselection hysteresis value;

compensating the first signal quality value in accordance with the first mobility state;

the performing cell reselection based on the first signal quality value comprises:

performing cell reselection based on the compensated first signal quality value.

10. The method of claim 8, wherein the performing cell reselection based on the first signal quality value comprises:

selecting the candidate cell if a second signal quality value of the candidate cell is greater than the first signal quality value.

11. The method of claim 10, wherein selecting the candidate cell if the second signal quality value of the candidate cell is greater than the first signal quality value comprises:

selecting the candidate cell if the second signal quality value of the candidate cell is greater than the first signal quality value for the same frequency duration.

12. The method of claim 11, further comprising:

and determining the same-frequency duration according to the first moving state.

13. The method of claim 1, wherein a candidate cell corresponds to a different frequency point from a current cell in which the terminal resides, the candidate cell is a neighboring cell of the current cell in which the terminal resides, and cell reselection is performed according to the first mobility state includes:

determining pilot frequency duration according to the first moving state;

and selecting the candidate cell under the condition that the measured received signal quality value of the candidate cell meets a signal quality threshold value in the pilot frequency duration.

14. The method of claim 1, wherein a candidate cell corresponds to a different frequency point from a currently camped cell of the terminal, the candidate cell is a neighboring cell of the currently camped cell, and performing cell reselection according to the first mobility state comprises:

determining pilot frequency duration according to the first moving state;

and selecting the candidate cell under the condition that the measured receiving signal level value of the candidate cell meets a signal level threshold value in the pilot frequency duration.

15. A cell reselection apparatus, comprising:

the terminal comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a first moving state of the terminal according to speed information of the terminal;

16. A terminal comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the computer program, when executed by the processor, causes the processor to carry out the steps of the method according to any of claims 1 to 14.

17. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 14.

18. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method according to any one of claims 1 to 14 when executed by a processor.