CN111615139B - Cell measurement method and device - Google Patents

Cell measurement method and device Download PDF

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Publication number
CN111615139B
CN111615139B CN202010448835.9A CN202010448835A CN111615139B CN 111615139 B CN111615139 B CN 111615139B CN 202010448835 A CN202010448835 A CN 202010448835A CN 111615139 B CN111615139 B CN 111615139B
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measurement
cell
signal
measurement period
difference set
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CN111615139A (en
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李伟清
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention discloses a cell measurement method and a cell measurement device, and belongs to the field of communication. The method comprises the following steps: in the ith measurement period, performing signal measurement on the serving cell and the adjacent cell to obtain respective corresponding measurement results of the serving cell and the adjacent cell, wherein the measurement results comprise cell signal strength; calculating to obtain a first difference set according to the signal strength of n cells of the serving cell and the historical signal value of the serving cell in the ith measurement period, wherein the first difference set comprises n signal strength differences; if the first difference set meets the preset condition, stopping signal measurement on the adjacent cell in the (i + 1) th measurement period; and if the first difference set does not meet the preset condition, performing signal measurement on the adjacent cell in the (i + 1) th measurement period. Whether to carry out adjacent cell measurement is determined based on multiple signal measurement results, so that the influence caused by terminal measurement errors and signal fluctuation can be reduced, and the accuracy of the time when the terminal stops or starts the adjacent cell measurement is improved.

Description

Cell measurement method and device
The application is divisional application of invention patents with application numbers of 201710851430.8, application dates of 2017, 09 and 19, and the name of the invention is 'cell measurement method and device'.
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a cell measurement method and a cell measurement device.
Background
In a mobile communication system, in order to ensure the communication quality of a terminal, a base station needs to perform cell reselection or handover on the terminal, and the cell reselection or handover of the base station depends on signal measurement and reporting of a terminal to an adjacent cell.
In the related art, in order to reduce the power consumption of a terminal, the terminal starts a first timer when performing signal measurement on a serving cell and an adjacent cell, and when the first timer reaches a timing, the terminal calculates a signal difference value of the serving cell at a timing starting time and a timing ending time; and when the signal difference value is greater than the threshold value, the terminal stops measuring the signals of the adjacent cells, starts the second timer and measures the adjacent cells again when the second timer reaches the timing.
Disclosure of Invention
The embodiment of the invention provides a cell measurement method and a cell measurement device, which can solve the problem that due to the influence of terminal measurement errors or signal fluctuation, the signal difference value obtained only by calculation according to the timing starting time and the timing ending time is inaccurate, so that the measurement of an adjacent cell is stopped or started by mistake. The technical scheme is as follows:
in a first aspect, a cell measurement method is provided, and the method includes:
in the ith measurement period, performing signal measurement on a serving cell and an adjacent cell to obtain respective corresponding measurement results of the serving cell and the adjacent cell, wherein the measurement results comprise cell signal strength, n times of signal measurement are performed in each measurement period, i is more than or equal to 1,n is more than or equal to 2, i, n is an integer;
calculating a first difference set according to the signal strength of n cells of the serving cell and the historical signal value of the serving cell in the ith measurement period, wherein the first difference set comprises n signal strength differences;
if the first difference set meets the preset condition, stopping signal measurement on the adjacent cell in the (i + 1) th measurement period;
and if the first difference set does not meet the preset condition, performing signal measurement on the adjacent cell in the (i + 1) th measurement period.
In a second aspect, there is provided a cell measurement apparatus, comprising:
the first measurement module is used for performing signal measurement on a serving cell and an adjacent cell in an ith measurement period to obtain respective corresponding measurement results of the serving cell and the adjacent cell, wherein the measurement results comprise cell signal strength, n times of signal measurement are performed in each measurement period, i is not less than 1,n is not less than 2, i is an integer, n is an integer;
a first calculating module, configured to calculate a first difference set according to n cell signal strengths of the serving cell and a historical signal value of the serving cell in the ith measurement period, where the first difference set includes n signal strength differences;
a first stopping module, configured to stop performing signal measurement on the neighboring cell in an i +1 th measurement period when the first difference set meets a preset condition;
and a second measurement module, configured to perform signal measurement on the neighboring cell in the (i + 1) th measurement period when the first difference set does not meet the preset condition.
In a third aspect, a terminal is provided, which includes: a processor, a memory coupled to the processor, and program instructions stored on the memory, which when executed by the processor, implement the cell measurement method as described above in relation to the first aspect.
In a fourth aspect, there is provided a computer readable storage medium having stored thereon program instructions which, when executed by a processor, implement the cell measurement method as described in the first aspect above.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
after the terminal measures signals of a serving cell and an adjacent cell in a current measurement period, calculating a difference set comprising n signal strength differences according to the cell signal strength of the serving cell and the historical signal value of the serving cell, which are obtained by measuring the signals n times in the measurement period, and determining that the terminal does not obviously move when the difference set meets a preset condition, so that the signal measurement of the adjacent cell is stopped in the next measurement period, and the power consumption of the terminal is reduced; when the difference set does not meet the preset condition, determining that the terminal obviously moves, and continuing to measure the signals of the adjacent cells in the next measurement period; meanwhile, whether the adjacent cell measurement is carried out in the next measurement period is determined based on the multiple signal measurement results in the measurement period, so that the influence caused by the measurement error of the terminal and the signal fluctuation can be reduced, and the accuracy of the time when the terminal stops or starts the adjacent cell measurement is improved.
Drawings
Fig. 1 is a schematic structural diagram of a mobile communication system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a cell measurement method according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a cell measurement method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an implementation of a moving process of a terminal in a mobile communication system;
fig. 5 is a flowchart illustrating a cell measurement method according to another embodiment of the present invention;
fig. 6 is a flowchart illustrating a cell measurement method according to another embodiment of the present invention;
fig. 7 is a block diagram illustrating a structure of a cell measurement apparatus according to an embodiment of the present invention;
fig. 8 is a diagram illustrating a structure of a terminal according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
For convenience of understanding, terms referred to in the embodiments of the present invention are explained below.
Serving Cell (Serving Cell): the Primary Cell (PCell) and the Secondary Cell (SCell) are cells that establish Radio Resource Control (RRC) connection with a terminal and provide service to the terminal.
Neighbor Cell (Neighbor Cell, NCell): also called neighboring cells, refers to other cells except the current access serving cell of the terminal. When the terminal is in an RRC idle state, the terminal measures an adjacent cell, reports measurement information to the base station, and instructs the terminal to reselect the cell according to the measurement information; and when the terminal is in the RRC connection state, the terminal measures the adjacent cells, reports the measurement information to the base station, and instructs the terminal to switch between the serving cell and the adjacent cells according to the measurement information.
Referring to fig. 1, a schematic structural diagram of a mobile communication system according to an embodiment of the present invention is shown. The mobile communication system may be an LTE system or a fifth generation mobile communication technology (the 5th generation mobile communication,5 g), which is also called a New Radio (NR) system. The mobile communication system includes: access network device 120 and terminal 140.
The access network device 120 may be a base station, which may be configured to convert the received radio frame and IP packet message into each other, and may coordinate attribute management of the air interface. For example, the base station may be an evolved Node B (eNB or e-NodeB) in LTE, or a base station in 5G system that adopts a centralized distributed architecture.
Optionally, in the mobile communication system shown in fig. 1, different access network devices 120 correspond to respective radio signal coverage areas (circular areas with the access network devices 120 as centers), the radio signal coverage areas are referred to as cells, and an intersection exists between different cells. In other possible embodiments, the same access network device 120 may correspond to multiple cells, and each cell corresponds to a different identifier, which is not limited in the embodiment of the present invention.
The access network device 120 and the terminal 140 establish a wireless connection over a wireless air interface. Optionally, the wireless air interface is based on an LTE standard; or the wireless air interface is a wireless air interface based on a 5G standard, for example, the wireless air interface is NR; alternatively, the wireless air interface may be a wireless air interface based on a 5G technology standard of a next generation mobile communication network.
Terminal 140 may refer to a device that provides voice and/or data connectivity to a user. The terminal may communicate with one or more core networks via a Radio Access Network (RAN), and the terminal 140 may be a mobile terminal, such as a mobile phone (or called "cellular" phone) and a computer having a mobile terminal, for example, a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device. For example, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Equipment (User Terminal), a User Agent (User Agent), a User Device (User Device), or a User Equipment (User Equipment).
The cell measurement method provided in each embodiment of the present invention is used in a scenario where the terminal 140 performs signal measurement on an adjacent cell in an RRC idle state or a connected state.
In the related art, the terminal determines whether the terminal has moved during the timing period only according to the signal difference calculated from the timing start time and the timing end time, however, the signal difference calculated by the terminal may not be accurate due to the measurement error or signal fluctuation of the terminal. For example, the terminal does not move within the timing period, but is affected by signal fluctuation at the timing end time, so that the calculated signal difference is large, it is further determined by mistake that the terminal moves within the timing period, signal measurement is continuously performed on the neighboring cell, and power consumption of the terminal is increased.
In addition, even when the terminal measurement error and the signal fluctuation are extremely small, the signal difference calculated from the timing start time and the timing end time cannot accurately reflect the moving state of the terminal in the timing period. For example, as shown in fig. 1, when the terminal 140 performs signal measurement on the serving cell (the cell corresponding to the upper left access network device 120) and the neighboring cells (the cells corresponding to the upper right and lower access network devices 120), the first timer is started, and during the timing period of the first timer, the terminal 140 moves from the location a to the location C along the paths a-B-C (the dashed paths in fig. 1). Since the location a and the location C are close to each other, the difference between the signals of the serving cell calculated by the terminal 140 at the timing start time (when the terminal 140 is at the location a) and the timing end time (when the terminal 140 is at the location C) is small, so that it is determined that the terminal 140 is in a non-moving state during the timing, and the signal measurement of the neighboring cell is stopped. However, in practical situations, when the terminal 140 is in a moving state within a timing period and the terminal 140 is located at the location B, the signal of the neighboring cell is better than the signal of the serving cell, and the terminal 140 needs to keep the measurement of the neighboring cell to ensure that the cell handover is performed normally. Therefore, the related art cannot accurately identify the moving state of the terminal in the timing period, and the measurement of the neighboring cell is easily stopped or started by mistake.
In order to solve the above problem, in the embodiment of the present invention, the terminal calculates a plurality of signal strength differences according to a plurality of signal measurement results in a measurement period and a historical signal value of a serving cell, and determines whether the terminal has moved significantly based on the plurality of signal strength differences, so as to reduce the influence caused by a measurement error of the terminal and signal fluctuation, improve the accuracy of the calculation result, and further improve the accuracy of the measurement opportunity when the terminal stops or starts a neighboring cell. The following description will be made by using exemplary embodiments.
Referring to fig. 2, a flowchart of a cell measurement method according to an embodiment of the present invention is shown, where the cell measurement method is used for the terminal shown in fig. 1 for example, and the method may include the following steps.
Step 201, in the ith measurement period, performing signal measurement on the serving cell and the neighboring cell to obtain respective corresponding measurement results of the serving cell and the neighboring cell, where the measurement results include cell signal strength, and performing signal measurement n times in each measurement period, where i is greater than or equal to 1,n is greater than or equal to 2, i, n is an integer.
In an RRC idle state or a connected state, the terminal performs Signal measurement on a current access serving cell and each neighboring cell respectively to obtain corresponding measurement results, where the measurement results include information such as cell Signal strength, cell Signal Quality (e.g., signal-to-noise ratio), and cell identifier, and the cell Signal strength is represented by Reference Signal Receiving Power (RSRP) and/or Reference Signal Receiving Quality (RSRQ).
In one possible implementation, the terminal performs signal measurement according to a preset measurement period, and performs signal measurement for a predetermined number (n times) in each measurement period, where the time interval of each signal measurement is the same (e.g. 460 ms). For example, the terminal performs 10 signal measurements in each measurement period, thereby obtaining 10 serving cell signal strengths and 10 × a neighbor cell signal strengths (a is related to the number of neighbor cells).
Step 202, a first difference set is calculated according to the signal strength of n cells of the serving cell and the historical signal value of the serving cell in the ith measurement period, wherein the first difference set comprises n signal strength differences.
After the signal measurement is completed for the predetermined number of times in the current measurement period (i.e., the ith measurement period), the terminal further calculates n signal strength differences according to the cell signal strength of the serving cell included in each measurement result and the stored historical signal value of the serving cell, and obtains a corresponding first difference set.
Optionally, when performing signal measurement in the 1 st measurement period, the terminal sets the cell signal strength included in the first measurement result of the serving cell as a historical signal value; when signal measurement is performed in a subsequent measurement period, the historical signal value of the serving cell is the cell signal strength contained in the first measurement result (the terminal does not move after the first measurement), or the cell signal strength updated according to the measurement result obtained in the previous measurement period (the terminal moves after the first measurement).
In one possible implementation, in the ith measurement period, the terminal obtains the signal strength of one cell (of the serving cell) every time the terminal measures the signal strength of the cell, that is, calculates the absolute value of the difference between the signal strength of the cell and the historical signal value, determines the calculated absolute value as the signal strength difference (that is, the signal strength difference = | the signal strength of the cell-the historical signal value |), and adds the signal strength difference to the first difference set.
Illustratively, the terminal performs 10 signal measurements in the ith measurement period, and obtains 10 cell signal strengths corresponding to the serving cell, which are (from front to back according to the measurement time): -30dBm, -31dBm, -24dBm, -36dBm, -29dBm, -31.5dBm, -28.5dBm, -30dBm, -31dBm, and a first difference value set obtained by the terminal through calculation is {0dBm,1dBm,6dBm, 1dBm,1.5dBm, 0dBm,1dBm } according to the measurement time from the front to the back according to the historical signal value of the service cell-30 dBm.
Optionally, when the signal strength difference is calculated, the terminal filters the signal strengths of n cells by using an arithmetic mean filtering method, and filters an interference value generated by a terminal measurement error or signal fluctuation. In other possible embodiments, the terminal may further filter the interference value by using an algorithm such as amplitude-limiting filtering, amplitude-limiting average filtering, or jitter-removing filtering, which is not limited in the embodiment of the present invention.
Compared with the method of calculating the average value of the cell signal strength for n times and determining whether the terminal moves or not by comparing the average value with the historical signal value, the method of determining the movement condition of the terminal based on the n signal strength difference values can reflect the movement track of the terminal in the measurement period more truly, and the accuracy of judging the movement state of the terminal is improved.
Further, the terminal detects whether the calculated first difference set meets a preset condition, and when the first difference set meets the preset condition, it is determined that no movement occurs in the ith measurement period, and the following step 203 is executed; when the first difference set does not meet the preset condition, it is determined that the movement has occurred in the ith measurement period, and the following step 204 is performed.
Step 203, if the first difference set meets the preset condition, stopping signal measurement on the neighboring cell in the (i + 1) th measurement period.
Since the measured signal strength of the serving cell usually changes in a small range when the terminal is in the non-mobile state, in a possible embodiment, the preset condition is: the first difference set at least comprises k signal intensity differences smaller than a threshold, k is not larger than n, and k is an integer.
That is, the terminal detects whether each signal strength difference in the first difference set is smaller than a threshold, and determines that the terminal does not move in the ith measurement period when the number of signal strength differences smaller than the threshold in the first difference set is greater than or equal to k.
Illustratively, in connection with the example in step 202, when the threshold is 5dBm, since the number of signal strength difference values smaller than the threshold in the first difference value set is 8 and is greater than k (k = 7), the terminal determines that the first difference value set meets the preset condition.
In another possible embodiment, the preset conditions are: the first difference set at least comprises j continuous signal strength differences smaller than a threshold value, wherein j is less than or equal to n, and j is an integer. Optionally, the consecutive j signal strength difference values are the n-j +1 th to the n-th signal strength difference values in the first difference value set.
That is, in the ith measurement period, when the difference between the cell signal strength obtained by the last j measurements and the historical signal value is smaller than the threshold (representing that the terminal does not move at the end of the ith measurement period, it can be inferred that the probability of moving in the next measurement period is low), it is determined that the first difference set meets the preset condition.
Illustratively, in connection with the example in step 202, when the threshold is 5dBm, since the first difference set includes 6 consecutive signal strength differences smaller than the threshold (j = 5), the terminal determines that the first difference set meets the preset condition.
Further, in order to reduce power consumption of the terminal in the non-mobile state, when it is detected that the first difference set meets the preset condition, the terminal further performs signal measurement on the serving cell in a next measurement period (i +1 th measurement period), and stops performing signal measurement on the neighboring cell.
And 204, if the first difference set does not meet the preset condition, performing signal measurement on the neighboring cell in the (i + 1) th measurement period.
Compared with step 203, since the measured signal strength of the serving cell generally has a larger variation range when the terminal is in a moving state, when the terminal detects that the number of signal strength differences smaller than the threshold in the first difference set does not reach k, or the number of consecutive signal strength differences smaller than the threshold in the first difference set is smaller than j, it is determined that the first difference set does not meet the preset condition, that is, it is determined that the terminal has moved in the ith measurement period, and continues to perform signal measurement on the neighboring cell in the next measurement period.
Optionally, after performing signal measurement on the serving cell and the neighboring cell simultaneously in the (i + 1) th measurement period, the terminal repeatedly performs step 202 to determine whether the terminal moves in the (i + 1) th measurement period, so that when the terminal does not move, the measurement on the neighboring cell is stopped in the next measurement period, and when the terminal moves, the measurement on the neighboring cell is continued in the next measurement period.
It should be noted that, when it is detected that the first difference set does not meet the preset condition, that is, when the terminal moves in the ith measurement period, the terminal updates the historical signal value of the serving cell according to the signal strength of n cells of the serving cell in the ith measurement period, and determines whether the terminal moves based on the updated historical signal value in the (i + 1) th measurement period.
In one possible implementation, the terminal calculates an average value of n cell signal strengths of the serving cell in the ith measurement period, and determines the average value as a historical signal value of the serving cell.
In other possible embodiments, the terminal may further update a certain cell signal strength (e.g., the loudness of the cell signal measured last in the measurement period) of the n cell signal strengths to the historical signal value of the serving cell.
In summary, in this embodiment, after the terminal performs signal measurement on the serving cell and the neighboring cell in the current measurement period, a difference set including n signal strength differences is obtained through calculation according to the cell signal strength of the serving cell and the historical signal value of the serving cell, which are obtained through n times of signal measurement in the measurement period, and when the difference set meets the preset condition, it is determined that the terminal does not significantly move, so that the signal measurement on the neighboring cell is stopped in the next measurement period, and the power consumption of the terminal is reduced; when the difference set does not meet the preset condition, determining that the terminal obviously moves, and continuing to measure the signals of the adjacent cells in the next measurement period; meanwhile, whether the adjacent cell measurement is carried out in the next measurement period is determined based on the multiple signal measurement results in the measurement period, so that the influence caused by the measurement error of the terminal and the signal fluctuation can be reduced, and the accuracy of the time when the terminal stops or starts the adjacent cell measurement is improved.
When the cell measurement method shown in fig. 2 is used to perform cell measurement, after the signal measurement on the neighboring cell is stopped in the i +1 th measurement period, in order to ensure that the terminal can perform the neighboring cell measurement again in the subsequent moving process, in a possible embodiment, on the basis of fig. 2, as shown in fig. 3, after step 203, the following steps are further included.
Step 205, performing signal measurement on the serving cell in the (i + 1) th measurement period.
In the (i + 1) th measurement period, although the terminal stops performing signal measurement on the neighboring cell, the terminal still needs to perform signal measurement on the serving cell, that is, the terminal obtains the signal strength of n cells corresponding to the serving cell in the (i + 1) th measurement period.
And step 206, calculating to obtain a second difference set according to the n cell signal strengths of the serving cells and the historical signal values of the serving cells in the (i + 1) th measurement period.
Similar to the step 202, after the terminal obtains the signal strength of n cells corresponding to the serving cell in the i +1 th measurement period, the terminal calculates a second difference set including the signal strength differences of n cells according to the signal strength of each cell and the historical signal value of the serving cell. The process of calculating the second difference set is similar to the process of calculating the first difference set, and this embodiment is not described herein again.
Further, after the second difference set is obtained through calculation, the terminal further detects whether the second difference set meets a preset condition, and executes step 207 when the second difference set meets the preset condition; when the second difference set does not meet the preset condition, step 208 is executed. The preset condition is the same as the preset condition in the embodiment corresponding to fig. 2, and the details of this embodiment are not repeated herein.
Step 207, if the second difference set meets the preset condition, stopping signal measurement on the neighboring cell in the (i + 2) th measurement period.
And when the second difference set meets the preset condition, the terminal determines that the terminal is in a non-moving state in the (i + 1) th measurement period, and then continues to stop signal measurement on the adjacent cell in the next measurement period, so that the power consumption of the terminal is reduced.
And step 208, if the second difference set does not meet the preset condition, performing signal measurement on the neighboring cell in the (i + 2) th measurement period.
And when the second difference set does not meet the preset condition, the terminal determines that the terminal is in a moving state in the (i + 1) th measurement period, and then restarts the signal measurement of the adjacent cell in the next measurement period so as to facilitate the terminal to report the measurement result of the adjacent cell.
In the cell measurement method shown in fig. 2, in the case of performing signal measurement on the serving cell and the neighboring cell simultaneously, the terminal determines whether the terminal moves according to only n signal measurement values of the serving cell in a measurement period. In a practical situation, as shown in fig. 4, the serving cell where the terminal is located corresponds to the base station 41, the neighboring cell corresponds to the base station 42, and the base station 43, in one measurement period, when the terminal moves from point a to point B, the difference between each signal measurement value measured by the terminal and the historical signal value is small, that is, the first difference set meets the preset condition, so as to determine that the terminal has not moved in the measurement period, and stop measuring the neighboring cell in the next measurement period. However, in actual situation, the terminal moves, and the signal of the neighboring cell at the B point is better than the signal of the serving cell, and the terminal needs to perform measurement and reporting of the neighboring cell, so that the base station performs cell handover.
In order to solve the above problem, in one possible implementation, the terminal determines whether the terminal moves according to signal measurement values of the serving cell and the neighboring cell in a measurement period at the same time, so as to improve the accuracy of determining the movement state of the terminal. On the basis of fig. 2, as shown in fig. 5, step 209 is further included after step 201, step 203 is replaced by step 210, and step 204 is replaced by step 211.
Step 201, in the ith measurement period, performing signal measurement on the serving cell and the neighboring cell to obtain respective corresponding measurement results of the serving cell and the neighboring cell, where the measurement results include cell signal strength, and performing signal measurement n times in each measurement period, where i is greater than or equal to 1,n is greater than or equal to 2, i, n is an integer.
Step 202, a first difference set is calculated according to the signal strength of n cells of the serving cell and the historical signal value of the serving cell in the ith measurement period, wherein the first difference set comprises n signal strength differences.
Step 209, a third difference set is calculated according to the n cell signal strengths of the neighboring cells and the historical signal values of the neighboring cells in the ith measurement period.
Similar to the step 202, after obtaining n measurement results corresponding to the neighboring cells in the ith measurement period, the terminal calculates a third difference set according to the cell signal strength of the neighboring cells and the historical signal values of the neighboring cells included in the n measurement results, where the third difference set includes absolute values of differences between the signal strengths of the (neighboring) cells and the historical signal values of the (neighboring) cells.
The process of calculating the third difference set is similar to the process of calculating the first difference set, and this embodiment is not described herein again.
Schematically, the third difference set obtained by the terminal calculation is {1dBm,1.3dBm,1.7dBm,2.5dBm,2.9dBm,4.5dBm,5.5dBm,6dBm,6.1dBm,6dBm }.
Step 210, if the first difference set meets the preset condition and the third difference set meets the preset condition, stopping signal measurement on the neighboring cell in the (i + 1) th measurement period.
After the difference sets corresponding to the serving cell and the neighboring cell are obtained through calculation, the terminal respectively detects whether the first difference set meets a preset condition or not, whether the third difference set meets the preset condition or not, determines that the terminal is in a non-moving state in the ith measurement period when the two difference sets meet the preset condition, and stops signal measurement on the neighboring cell in the next measurement period.
In step 211, if the first difference set does not meet the preset condition and/or the third difference set does not meet the preset condition, performing signal measurement on the neighboring cell in the (i + 1) th measurement period.
And when at least one of the first difference set and the third difference set does not meet the preset condition, the terminal determines that the mobile terminal moves in the ith measurement period and continues to measure the signals of the adjacent cells in the next measurement period.
Illustratively, in the communication system shown in fig. 4, the terminal calculates a first difference set corresponding to the serving cell as {0dbm,1dbm,6dbm, 1dbm,1.5dbm, 0dbm,1dbm } (although the terminal has moved, the distance between the terminal and the base station 41 does not change greatly), and a third difference set corresponding to the neighboring cell as {1dbm,1.3dbm,1.7dbm,2.5dbm,2.9dbm, 4.5m, 5.5dbm,6dbm, 6.9dbm, 6dbm } (the terminal is closer to the base station 42 during the movement). Since the first difference set meets the preset condition and the third difference set does not meet the preset condition, the terminal determines that the movement occurs in the ith measurement period.
Optionally, when the third set does not meet the preset condition, the terminal updates the historical signal value of the neighboring cell according to the signal strength of n cells corresponding to the neighboring cell on the ith measurement period side.
In this embodiment, the terminal determines whether the terminal moves according to the signal measurement results of the serving cell and the neighboring cell in the measurement period, so as to improve the accuracy of determining the moving state of the terminal, thereby further improving the accuracy of the timing when the terminal stops or starts the measurement of the neighboring cell.
In order to further reduce the power consumption of the terminal, in one possible implementation, when frequent cell switching is not performed, the length of the measurement period is extended, so that the terminal is in a state of stopping the measurement of the neighboring cell for a long time. On the basis of fig. 2, as shown in fig. 6, before the step 201, the following steps are further included.
Step 212, a cell switching frequency within a predetermined time duration is obtained.
The terminal acquires the cell switching frequency within a preset time length in an RRC idle state or a connected state, wherein the higher the cell switching frequency is, the more frequent the cell switching frequency is, namely the terminal is in a mobile state within the preset time length.
For example, the cell switching frequency of the terminal acquired in the last 5 seconds is 1 time/second.
Step 213, adjusting the length of the measurement period according to the cell switching frequency, wherein the cell switching frequency and the length of the measurement period are in a negative correlation, and the number of times of signal measurement in the measurement period and the length of the measurement period are in a positive correlation.
In a possible implementation manner, the terminal stores a corresponding relationship between the cell switching frequency and the length of the measurement period in advance, and after the cell switching frequency of the terminal is obtained, the terminal searches the length of the corresponding measurement period from the corresponding relationship and performs adjustment based on the length of the measurement period. The higher the cell switching frequency is, the shorter the length of the measurement period is, the fewer the times of signal measurement in the corresponding measurement period is, the lower the cell switching frequency is, the longer the length of the measurement period is, the more the times of signal measurement in the corresponding measurement period is, that is, the more frequent the cell switching is, the shorter the time for the terminal to stop the measurement of the adjacent cell is, the less frequent the cell switching is, and the longer the time for the terminal to stop the measurement of the adjacent cell is, thereby reducing the power consumption of the terminal in a non-mobile state.
In this embodiment, the terminal dynamically adjusts the length of the measurement period according to the cell switching frequency, so that the terminal is in a state of stopping measurement in an adjacent cell for a long time in a non-mobile state, and power consumption of the terminal is further reduced.
Referring to fig. 7, a block diagram of a cell measurement apparatus according to an embodiment of the present invention is shown, where the cell measurement apparatus may be implemented as part or all of terminal 140 shown in fig. 1 through software, hardware, or a combination of both. The apparatus may include: a first measurement module 710, a first calculation module 720, a first stop module 730, and a second measurement module 740.
A first measurement module 710, configured to perform signal measurement on a serving cell and an adjacent cell in an ith measurement period to obtain measurement results corresponding to the serving cell and the adjacent cell, where the measurement results include cell signal strength, and signal measurement is performed n times in each measurement period, i is greater than or equal to 1,n and is greater than or equal to 2, i, n is an integer;
a first calculating module 720, configured to calculate a first difference set according to the n cell signal strengths of the serving cell and the historical signal values of the serving cell in the ith measurement period, where the first difference set includes n signal strength differences;
a first stopping module 730, configured to stop performing signal measurement on the neighboring cell in an i +1 th measurement period when the first difference set meets a preset condition;
a second measurement module 740, configured to perform signal measurement on the neighboring cell in the (i + 1) th measurement period when the first difference set does not meet the preset condition.
Optionally, the preset conditions include:
the first difference set at least comprises k signal strength differences smaller than a threshold, k is less than or equal to n, and k is an integer;
or the like, or a combination thereof,
the first difference set at least comprises j continuous signal strength differences smaller than the threshold, j is smaller than or equal to n, and j is an integer.
Optionally, the apparatus further includes:
a third measurement module, configured to perform signal measurement on the serving cell in the (i + 1) th measurement period;
a second calculating module, configured to calculate a second difference set according to the n cell signal strengths of the serving cell and the historical signal values of the serving cell in the i +1 th measurement period;
a second stopping module, configured to stop performing signal measurement on the neighboring cell in an i +2 th measurement period when the second difference set meets the preset condition;
and the fourth measurement module is used for performing signal measurement on the adjacent cell in the (i + 2) th measurement period when the second difference set does not meet the preset condition.
Optionally, the apparatus further includes:
an updating module, configured to update a historical signal value of the serving cell according to n cell signal strengths of the serving cell in the ith measurement period when the first difference set does not meet the preset condition;
optionally, the apparatus further includes:
a third calculating module, configured to calculate a third difference set according to the n cell signal strengths of the neighboring cells and the historical signal values of the neighboring cells in the ith measurement period;
the first stopping module 730 is further configured to:
and if the first difference set meets the preset condition and the third difference set meets the preset condition, stopping signal measurement on the adjacent cell in the (i + 1) th measurement period.
Optionally, the apparatus further comprises:
the device comprises an acquisition module, a switching module and a switching module, wherein the acquisition module is used for acquiring the cell switching frequency within a preset time length;
and the adjusting module is used for adjusting the length of the measuring period according to the cell switching frequency, wherein the cell switching frequency and the length of the measuring period are in a negative correlation relationship, and the number of times of signal measurement in the measuring period and the length of the measuring period are in a positive correlation relationship.
To sum up, in this embodiment, after the terminal performs signal measurement on the serving cell and the neighboring cell in the current measurement period, a difference set including n signal strength differences is calculated according to the cell signal strength of the serving cell and the historical signal value of the serving cell, which are obtained through n signal measurements in the measurement period, and when the difference set meets a preset condition, it is determined that the terminal does not significantly move, so that the signal measurement on the neighboring cell is stopped in the next measurement period, and the power consumption of the terminal is reduced; when the difference set does not meet the preset condition, determining that the terminal obviously moves, and continuing to measure the signals of the adjacent cells in the next measurement period; meanwhile, whether the adjacent cell measurement is carried out in the next measurement period is determined based on multiple signal measurement results in the measurement period, so that the influence caused by measurement errors and signal fluctuation of the terminal can be reduced, and the accuracy of the time for stopping or starting the adjacent cell measurement by the terminal is improved.
In this embodiment, the terminal determines whether the terminal moves according to the signal measurement results of the serving cell and the neighboring cell in the measurement period, so as to improve the accuracy of determining the moving state of the terminal, thereby further improving the accuracy of the timing when the terminal stops or starts the measurement of the neighboring cell.
In this embodiment, the terminal dynamically adjusts the length of the measurement period according to the cell switching frequency, so that the terminal is in a state of stopping measurement in an adjacent cell for a long time in a non-mobile state, and power consumption of the terminal is further reduced.
Fig. 8 is a diagram illustrating a structure of a terminal according to an exemplary embodiment of the present invention. The terminal includes: a processor 811, a receiver 812, a transmitter 813, a memory 814, and a bus 815.
The processor 811 includes one or more processing cores, the memory 814 is coupled to the processor 811 through the bus 815, the memory 814 is used for storing program instructions, and the processor 811 implements the cell measurement method provided by the various method embodiments described above when executing the program instructions in the memory 814.
Alternatively, the memory 814 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The receiver 812 and the transmitter 813 are each coupled to the processor 811 by a bus 815. Optionally, processor 811 executes program instructions in memory 814 to control receiver 812 and transmitter 813 for serving cell and neighbor cell measurements.
The receiver 812 and the transmitter 813 may be implemented as one communication component, which may be a piece of communication chip for modulating and/or demodulating information and receiving or transmitting the information through a wireless signal.
The above structural illustration is only an illustrative illustration of the terminal, and the terminal may include more or fewer components, for example, the terminal may not include a transmitter, or the terminal further includes other components such as a sensor, a display screen, and a power supply, and details are not described in this embodiment.
Embodiments of the present invention further provide a computer-readable storage medium, on which program instructions are stored, and when the program instructions are executed by the processor 811, the cell measurement method provided by each of the above-mentioned method embodiments is implemented.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (8)

1. A method of cell measurement, the method comprising:
acquiring cell switching frequency within a preset time length;
adjusting the length of a measurement period according to the cell switching frequency, wherein the length of the measurement period is in a negative correlation with the cell switching frequency, and the number of times of signal measurement in the measurement period is in a positive correlation with the length of the measurement period;
in the ith measurement period, performing signal measurement on a serving cell and an adjacent cell to obtain respective corresponding measurement results of the serving cell and the adjacent cell, wherein the measurement results comprise cell signal strength, n times of signal measurement are performed in each measurement period, i is not less than 1,n is not less than 2, i, n is an integer;
calculating a first difference set according to the signal strength of n cells of the serving cell and the historical signal value of the serving cell in the ith measurement period, wherein the first difference set comprises n signal strength differences;
calculating to obtain a third difference set according to the n cell signal strengths of the adjacent cells and the historical signal values of the adjacent cells in the ith measurement period;
if the first difference set and the third difference set meet preset conditions, stopping signal measurement on the adjacent cell in the (i + 1) th measurement period;
and if at least one difference set in the first difference set and the third difference set does not meet the preset condition, performing signal measurement on the adjacent cell in the (i + 1) th measurement period.
2. The method according to claim 1, wherein the preset condition comprises:
at least k signal intensity differences are smaller than a threshold value, k is less than or equal to n, and k is an integer;
or the like, or, alternatively,
at least comprising j continuous signal intensity difference values smaller than the threshold value, wherein j is not more than n, and j is an integer.
3. The method according to claim 1 or 2, wherein after the stopping of the signal measurement of the neighboring cell in the i +1 th measurement period, the method further comprises:
performing signal measurement on the serving cell in the (i + 1) th measurement period;
calculating to obtain a second difference set according to the n cell signal strengths of the serving cell and the historical signal values of the serving cell in the (i + 1) th measurement period;
if the second difference set meets the preset condition, stopping signal measurement on the adjacent cell in the (i + 2) th measurement period;
and if the second difference set does not meet the preset condition, performing signal measurement on the adjacent cell in the (i + 2) th measurement period.
4. The method of claim 1 or 2, further comprising:
and if the first difference set does not meet the preset condition, updating the historical signal value of the service cell according to the signal strength of n cells of the service cell in the ith measurement period.
5. An apparatus for cell measurement, the apparatus comprising:
the device comprises an acquisition module, a switching module and a switching module, wherein the acquisition module is used for acquiring the cell switching frequency within a preset time length;
an adjusting module, configured to adjust a length of a measurement period according to the cell switching frequency, where the length of the measurement period is in a negative correlation with the cell switching frequency, and a number of times of signal measurement performed in the measurement period is in a positive correlation with the length of the measurement period;
the first measurement module is used for performing signal measurement on a serving cell and an adjacent cell in an ith measurement period to obtain respective corresponding measurement results of the serving cell and the adjacent cell, wherein the measurement results comprise cell signal strength, n times of signal measurement are performed in each measurement period, i is not less than 1,n is not less than 2, i is an integer, n is an integer;
a first calculating module, configured to calculate a first difference set according to n cell signal strengths of the serving cell and a historical signal value of the serving cell in the ith measurement period, where the first difference set includes n signal strength differences; calculating to obtain a third difference set according to the n cell signal strengths of the adjacent cells and the historical signal values of the adjacent cells in the ith measurement period;
a first stopping module, configured to stop performing signal measurement on the neighboring cell in an i +1 th measurement period when the first difference set and the third difference set meet a preset condition;
a second measurement module, configured to perform signal measurement on the neighboring cell in the (i + 1) th measurement period when at least one difference set of the first difference set and the third difference set does not meet the preset condition.
6. The apparatus of claim 5, wherein the preset condition comprises:
at least k signal intensity differences are smaller than a threshold value, k is less than or equal to n, and k is an integer;
or the like, or, alternatively,
at least comprising j continuous signal intensity differences smaller than the threshold value, wherein j is not larger than n, and j is an integer.
7. A terminal comprising a processor, a memory coupled to the processor, and program instructions stored on the memory, which when executed by the processor, implement the cell measurement method of any of claims 1 to 4.
8. A computer-readable storage medium, having stored thereon program instructions which, when executed by a processor, implement the cell measurement method of any one of claims 1 to 4.
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