CN115442858A - Cell switching control method, device and equipment - Google Patents
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The present specification provides a cell handover control method, device and equipment. The method comprises the following steps: when the condition of switching out of a service cell is determined to be met, the moving direction of a user is obtained; determining the direction arrival angle corresponding to each adjacent cell based on the user moving direction and the signal coverage direction of each adjacent cell; and determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle, wherein the preset screening condition is used for restricting the value range of the azimuth arrival angle. Therefore, the switching control of the cell can be carried out based on the motion characteristics of the user, so that the selection of the switched adjacent cell has high consistency with the moving direction of the user, the risk of switching to the adjacent cells in different directions is reduced, and the subsequent switching failure and the probability of call drop are avoided.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method, an apparatus, and a device for controlling cell handover.
Background
The cell with good network quality is the most important condition for ensuring good perception of the user, and an accurate mobility strategy is particularly important along with the change of the network environment in the moving process of the user.
In the prior art, algorithm statistics is performed according to interoperation parameters of a serving cell and an adjacent cell, when a terminal measures that the level of the serving cell is lower than a specified threshold and the level of the adjacent cell is higher than the specified threshold, inter-cell same-frequency and inter-frequency switching is completed, and detailed strategies are as follows: switching with same frequency and priority by adopting an A3 strategy, namely switching to an adjacent cell when the service cell level is inferior to the adjacent cell based on an A3 event algorithm and the duration time reaches time delay; switching between different frequencies and the same priority, adopting an A2+ A3 strategy, namely starting different frequency measurement when the level of a service cell is lower than an A2 threshold (such as ≦ -88 dBm), and switching to an adjacent cell when the level of the service cell is inferior to that of the adjacent cell based on an A3 event algorithm and the duration time reaches time delay; switching from a low-priority cell to a high-priority cell, adopting an A2+ A4 strategy, namely starting pilot frequency measurement when the level of a service cell is lower than an A2 threshold (such as ≤ 90 dBm), and switching to a neighboring cell through A4 judgment when the level of the neighboring cell is higher than the A4 threshold (such as ≥ 100 dBm) and the duration time reaches time delay; and switching to the low-priority cell from the high-priority cell, adopting an A2+ A5 strategy, namely starting the pilot frequency measurement when the level of the serving cell is lower than an A2 threshold (such as less than or equal to-90 dBm), and when the level of the serving cell is lower than an A5 threshold 1 (such as less than or equal to-105 dBm), the level of the adjacent cell is higher than an A5 threshold 2 (such as greater than or equal to-100 dBm), and when the duration reaches the time lag, switching to the adjacent cell through an A5 decision. However, the evaluation item of the handover decision condition in the prior art is single, and the optimal handover opportunity and handover point cannot be effectively controlled.
Therefore, there is a need to provide a more efficient cell handover control scheme.
Disclosure of Invention
Embodiments of the present disclosure provide a cell handover control method, so that selection of a handover neighboring cell has high consistency with a user moving direction, thereby reducing risk of handover to neighboring cells in different directions and avoiding probability of subsequent handover failure and call drop.
An embodiment of the present specification further provides a cell handover control method, including:
when the condition of switching out of the service cell is determined to be met, the moving direction of a user is obtained;
determining an azimuth arrival angle corresponding to each adjacent cell based on the user moving direction and the signal coverage direction of each adjacent cell;
and determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle, wherein the preset screening condition is used for restricting the value range of the azimuth arrival angle.
An embodiment of the present specification further provides a cell handover control apparatus, including:
the acquisition module is used for acquiring the moving direction of a user when the condition of switching out a service cell is determined to be met;
a determining module, configured to determine an azimuth arrival angle corresponding to each neighboring cell based on the user moving direction and a signal coverage direction of each neighboring cell;
and the screening module is used for determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle, wherein the preset screening condition is used for restricting the value range of the azimuth arrival angle.
An embodiment of the present specification further provides a network device, including: a communication interface, a processor, and a memory;
the processor invokes program instructions in the memory to perform the following acts:
when the condition of switching out of the service cell is determined to be met, the moving direction of a user is obtained;
determining an azimuth arrival angle corresponding to each adjacent cell based on the user moving direction and the signal coverage direction of each adjacent cell;
and determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle, wherein the preset screening condition is used for restricting the value range of the azimuth arrival angle.
The present specification embodiments also provide a computer readable storage medium storing one or more programs that, when executed by an electronic device that includes a plurality of application programs, cause the electronic device to perform the acts of:
when the condition of switching out of a service cell is determined to be met, the moving direction of a user is obtained;
determining an azimuth arrival angle corresponding to each adjacent cell based on the user moving direction and the signal coverage direction of each adjacent cell;
and determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle, wherein the preset screening condition is used for restricting the value range of the azimuth arrival angle.
In any of the embodiments of the present specification, the cell switching control is performed based on the motion characteristics of the user, so that the selection of the switched neighboring cell has high consistency with the moving direction of the user, the risk of switching to neighboring cells in different directions is reduced, and the probability of subsequent handover failure and call drop is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the specification and are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description serve to explain the description and not to limit the specification in a non-limiting sense. In the drawings:
fig. 1 is a flowchart illustrating a cell handover control method according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating a method for controlling cell handover according to another embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a method for controlling cell handover according to another embodiment of the present disclosure;
fig. 4 is a flowchart illustrating a cell handover control method according to another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a cell handover control apparatus according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present specification clearer, the technical solutions of the present specification will be clearly and completely described below with reference to specific embodiments of the present specification and corresponding drawings. It is to be understood that the embodiments described are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step based on the embodiments in this description belong to the protection scope of this document.
The technical solutions provided by the embodiments of the present description are described in detail below with reference to the accompanying drawings.
Fig. 1 is a flowchart illustrating a cell handover control method according to an embodiment of the present disclosure, where the method may be executed by a base station serving a cell, and referring to fig. 1, the method may specifically include the following steps:
the serving cell refers to a cell currently serving the user equipment, and the neighboring cell refers to a cell adjacent to the serving cell.
Specifically, the method comprises the following steps: the base station can calculate the moving direction of the user according to the longitude and latitude reported by the user equipment periodically.
It should be noted that, a specific implementation manner of the step of determining that the condition for switching out of the serving cell is satisfied may be:
determining a signal coverage direction of the serving cell; determining a direction arrival angle corresponding to the serving cell based on the signal coverage direction and the user moving direction; and if the direction arrival angle exceeds a preset direction arrival angle value range, determining that the condition of switching out the service cell is met.
104, determining an azimuth arrival angle corresponding to each adjacent cell based on the user moving direction and the signal coverage direction of each adjacent cell; the signal coverage direction of the cell may correspond to a cell azimuth.
One implementation may be:
determining a direction line of the adjacent cell based on the signal coverage direction of the adjacent cell, wherein the direction line is a normal line corresponding to a midpoint of a curve corresponding to the signal coverage direction; determining position information of an intersection point of a direction line of the adjacent cell and the user moving direction; and determining an angle taking the intersection point as a vertex as an azimuth arrival angle of the adjacent cell based on the position information of the intersection point, the position information of the user equipment and the position information of the base station of the adjacent cell. Specific examples can be:
the user equipment periodically reports the longitude and latitude of the user, and measures and reports the information of the azimuth angle, the longitude and latitude, the TA distance, the level, the quality, the load and the like of the neighbor cell according to the neighbor cell frequency point configuration of the service cell. The base station calculates the moving direction and speed of the user according to the longitude and latitude variation condition period (such as the period of 1 second) of the user, periodically calculates the angle ABC formed by the connecting lines of all the base station positions A of the adjacent cells, the intersection B of the square lines of the adjacent cells and the user moving trend route and the point C of the user position, namely the direction arrival angle of the adjacent cells according to the longitude and latitude and the azimuth of the adjacent cells (the number of which is more than or equal to 1) of which the level value measured by the user is more than or equal to a specified threshold (such as the RSRP is more than or equal to-105 dBm).
Based on this, the direction of arrival of each neighboring cell is calculated by introducing the user moving direction and the cell signal coverage direction in the embodiment, so that neighboring cells having high consistency with the user moving direction in the neighboring cells can be accurately screened out, and the risks of subsequent handover failure and call drop are reduced.
And 106, determining target adjacent cells which meet preset screening conditions in all adjacent cells based on the azimuth arrival angle, wherein the preset screening conditions are used for restricting the value range of the azimuth arrival angle.
Specific examples can be: the adjacent cell closest to the user moving direction is preferably used as the target adjacent cell according to the size of the adjacent cell azimuth arrival angle (for example, the adjacent cell azimuth arrival angle is more than or equal to 1200).
Further, after the target neighbor cell is selected, the weights can be comprehensively sorted according to evaluation factors such as interference, quality, load, distance and the like of the candidate target cell to obtain the optimal value. Specifically, the method comprises the following steps:
based on a preset evaluation factor, evaluating each target adjacent cell to obtain an optimal target adjacent cell; controlling the user equipment to switch to the optimal target neighbor cell; wherein the evaluation factors at least comprise interference electrical frequency, quality, load, TA distance.
Based on this, the embodiment can perform comprehensive scoring on the interference, quality and load of the target cell, select the optimal cell as the handover target cell, and reduce the risk of user perception degradation after the target cell is occupied.
Therefore, in the embodiment, the cell switching control is performed based on the user motion characteristics, so that the selection of the switched neighbor cell has high consistency with the user moving direction, the risk of switching to neighbor cells in different directions is reduced, and the subsequent switching failure and the probability of call drop are avoided.
In another feasible embodiment, on the basis of the embodiment corresponding to fig. 1, the embodiment considers the influence of the user moving speed on the cell handover control, for example, when the user moving speed is fast, the situation that the handover is not timely may be caused, and therefore, the embodiment further provides a scheme for selecting a neighboring cell matched with the user moving speed, referring to fig. 2, which may specifically include the following steps:
specifically, the method comprises the following steps: the user equipment reports the latitude and longitude to the base station periodically, and the base station calculates the moving direction of the user based on the change condition of the latitude and longitude.
It should be noted that, a specific implementation manner of the step of determining that the condition for switching out of the serving cell is satisfied may be:
determining a TA distance between the user equipment and a base station antenna corresponding to a serving cell; determining a signal coverage direction of the serving cell; determining an azimuth arrival angle corresponding to the serving cell based on the signal coverage direction and the user moving direction; and if the TA distance exceeds a preset TA distance value range and the azimuth arrival angle exceeds a preset azimuth arrival angle value range, determining that the condition of switching out the service cell is met. And the preset TA distance value range is generated according to the current user moving speed.
specifically, the method comprises the following steps: and the user equipment measures and reports the TA distance of the adjacent cell to the record of the serving cell according to the frequency point of each adjacent cell, wherein the frequency points of the adjacent cells are different.
And step 206, determining a target adjacent cell which meets a preset screening condition in the adjacent cells based on the azimuth arrival angle and the TA distance, wherein the preset screening condition is further used for restricting a value range of the TA distance, and the value range of the TA distance is generated according to the user moving speed.
The calculation method of the direction arrival angle of each neighboring cell is described in the embodiment corresponding to fig. 1, and therefore, the description thereof is omitted here.
Then step 206 may be specifically exemplified by: based on the direction arrival angle of the neighboring cell and the TA distance (for example, the direction arrival angle of the neighboring cell is greater than or equal to 1200, and the TA distance is less than or equal to 500 m), the neighboring cell closest to the user moving direction and having the strongest level is preferred as the potential target cell.
Therefore, on the basis of the embodiment corresponding to fig. 1, the embodiment further considers the TA distance between the user mobile terminal and the neighboring cell to screen the neighboring cell, and increases the evaluation on the fast moving characteristic of the user, thereby avoiding the situations that the coverage direction and distance of the target cell occupied by the handover are not matched with the user moving direction and speed seriously, and the coverage, interference and quality of the target cell are degraded quickly after the target cell is occupied, and thus effectively improving the handover effect of the neighboring cell.
In another possible embodiment, on the basis of the embodiments corresponding to fig. 1 and fig. 2, the present embodiment further provides a scheme for selecting a neighboring cell with a higher level strength in consideration of the influence of the level strength of the cell, and with reference to fig. 3, the method may specifically include the following steps:
step 302, when determining that the condition of switching out the serving cell is satisfied, determining the level intensity of each neighboring cell reported by the user equipment;
specifically, the method comprises the following steps: and the user equipment reports the level intensity of the adjacent cells to the record of the serving cell according to the frequency point measurement of each adjacent cell, wherein the frequency points of the adjacent cells are different.
It should be noted that, a specific implementation manner of the step of determining that the condition for switching out of the serving cell is satisfied may be:
determining the level intensity of a serving cell reported by user equipment; determining a signal coverage direction of the serving cell; determining an azimuth arrival angle corresponding to the serving cell based on the signal coverage direction and the user moving direction; and if the level intensity exceeds a preset level intensity value range and the direction arrival angle exceeds a preset direction arrival angle value range, determining that the condition of switching out the service cell is met.
And 304, determining a target adjacent cell which meets a preset screening condition in the adjacent cells based on the azimuth arrival angle and the level strength, wherein the preset screening condition is also used for presetting a value of the level strength.
Specific examples can be: and preferably selecting the neighbor cell which is closest to the moving direction of the user and has the strongest level as a potential target cell according to the direction arrival angle and the level of the neighbor cell (such as the direction arrival angle of the neighbor cell is more than or equal to 1200 and the RSRP of the neighbor cell is more than or equal to-100 dBm).
It can be seen from this that, in addition to the embodiments corresponding to fig. 1 and 2, the present embodiment further considers the level strength of the neighboring cells to screen the neighboring cells, and ensures that the service mobility performance that can be provided by the cells after handover is excellent.
Fig. 4 is a flowchart illustrating a cell handover control method according to another embodiment of the present disclosure, referring to fig. 4, where the method specifically includes the following steps:
Specifically, the method comprises the following steps: acquiring position information reported by user equipment and level intensity of a serving cell; determining a user movement speed based on the location information; and if the user moving speed and the level strength both reach a switching threshold value and the maintaining time length reaches a time length threshold value, triggering and determining that the condition of switching out the service cell is met.
Specifically, it may be exemplified as: setting starting conditions for switching control based on the movement trend of the user for the macro base station cell: a. setting a switching threshold based on motion trend (for example, the motion speed is more than 8.3 m/s, which is equivalent to 30 KM/h for urban driving); b. setting a switching level RSRP threshold (such as RSRP > -105 dBm) based on the movement trend; c. the duration (e.g., >5 seconds) is set to satisfy both of the above two requirements. The user terminal periodically and actively reports the longitude and latitude and the measurement level, and if the service cell detects that a certain user terminal simultaneously meets the three conditions, switching control is started in real time based on the movement trend of the user terminal; in the subsequent process, when one or more conditions are not met any more, the switching process based on the movement trend is stopped, and the same-frequency and different-frequency switching is carried out through A3, A2+ A4 and A2+ A5 according to the normal switching process.
Specifically, the method comprises the following steps: and if the TA distance exceeds a preset TA distance value range, the azimuth arrival angle exceeds a preset azimuth arrival angle value range and the level intensity exceeds a preset level intensity value range, determining that the condition of switching out of the serving cell is met.
Specific examples can be: the base station calculates the moving direction and speed of the user according to the latitude and longitude variation condition period (such as 1 second period) reported by the user, and periodically calculates the angle ABC formed by the connection lines of a point A of the base station position of the service cell, a point B where the azimuth line of the service cell intersects with the moving trend route of the user and a point C of the user, namely the azimuth arrival angle of the service cell, by combining the latitude and longitude and azimuth data of the service cell. Based on the consideration of motion attributes, three conditions of the direction arrival angle of the serving cell of the current user being more than or equal to 1900, the distance being more than or equal to 800m and the RSRP being less than or equal to-100 dBm are suggested to be simultaneously met as main cut-out judgment conditions.
Specific examples can be: the user equipment periodically reports the longitude and latitude of the user, and reports the information of the azimuth angle, the longitude and latitude, the TA distance, the level and the like of the neighbor cell according to the neighbor cell frequency point configuration measurement of the service cell. The base station calculates the moving direction and speed of the user according to the longitude and latitude variation condition period (such as 1 second period) of the user, and periodically calculates the angle ABC formed by the connecting lines of all the base station position A points of all the adjacent cells, the square bit lines of the adjacent cells, the intersection B of the moving trend route of the user and the point C of the user, namely the arrival angle of the direction of the adjacent cells according to the longitude and latitude and the azimuth of the adjacent cells (the number of which is more than or equal to 1) of which the level value measured by the user is more than or equal to a specified threshold (such as RSRP is more than or equal to-100 dBm). And preferably selecting the neighbor cell which is closest to the user moving direction and has the strongest level as a potential target cell according to the direction arrival angle of the neighbor cell, the TA distance and the level (such as the direction arrival angle of the neighbor cell is more than or equal to 1200, the TA distance is less than or equal to 500m and the RSRP of the neighbor cell is more than or equal to-100 dBm).
Specifically, the method comprises the following steps: in the process of selecting the target cell, cells of which the size (main basis), distance, level and frequency priority of the azimuth arrival angle of the comprehensive examination and filtration meet the requirements of a switching event are used as candidate target cells, and the optimal value is obtained by comprehensively ranking the weights according to evaluation factors such as interference, quality, load, distance and the like of the candidate target cells.
Specific examples can be: firstly, according to different wireless scenes, different weights are set for each evaluation factor, and a normal value, a degradation value and a limit degradation value of the evaluation factors of adjacent cells are added in a service cell. If a certain evaluation factor of the target cell to be selected is better than a normal value, the evaluation factor is divided into 1 (for example, the azimuth arrival angle is less than or equal to 300, the distance is less than or equal to 500m, the RSRP is more than or equal to-85 dBm, the interference is less than or equal to-110 dBm, the quality CQI is more than or equal to 5, and the PRB utilization rate is less than or equal to 40%); a linear score (0.0-1) if an evaluation factor is worse than normal but between normal and extreme degradation values, (e.g., 300 < azimuth arrival angle < 1200, 500m < distance < 1000m, -105dBm < RSRP < 85dBm, -110dBm < interference < 100dBm, 2 < quality CQI < 5, 40% < PRB utilization < 90%); if any evaluation factor of the target cells to be selected is inferior to the limit degradation value, all the switching weights return to zero, and the qualification of the target cells is cancelled (such as the azimuth arrival angle is more than or equal to 1200, the distance is more than or equal to 1000m, the RSRP is less than or equal to-105 dBm, the interference is more than or equal to-100 dBm, the CQI value is less than or equal to 2, and the PRB utilization rate is more than or equal to 90%). And finally, taking the highest value of the weighted score sum of all the evaluation factors as the target cell.
Decision execution for switching control based on user movement trend, step 410
When any one of the azimuth arrival angle, the level, the interference, the quality and the capacity of the serving cell is inferior to a specified threshold, a switching-out condition is met; and the surrounding target cells exist, the azimuth arrival angle (main basis), the level and the frequency priority of the target cells meet the requirement of a switching event, and the evaluation of interference, quality, load, distance and the like reaches the standard. And the duration is more than 320ms, and the service cell judges that the user terminal carries out switching control based on the user motion trend.
Therefore, on one hand, the function of switching control based on the movement trend of the user is introduced into the macro base station cell in the embodiment, so that the selection of the switching adjacent cell has high consistency with the moving direction of the user, the control of the switching time point has timeliness, the possibility of switching to the adjacent cells in different directions is reduced, and the risks of subsequent switching failure and call drop are avoided; the method effectively avoids the frequent switching of the UE terminal moving at high speed among a plurality of different peripheral non-main coverage cells in the prior art, and reduces the negative gain of the switching. On the other hand, the comprehensive evaluation of the weights of factors such as azimuth arrival angle, level, distance, interference, quality, load and the like is innovatively introduced into the 4G network handover judgment on potential target cells occupied by the planned handover, the priority is ranked to be optimal, and the service quality of voice and data services is improved while the service mobility performance is kept to be excellent. The scheme successfully solves the problem that in the prior art, after the switching is finished only according to the strength of the level, the user perception is seriously deteriorated due to the abnormal conditions of interference, quality, load, cross-zone coverage and the like existing in the target cell.
Fig. 5 is a schematic structural diagram of a cell handover control apparatus according to an embodiment of the present disclosure, and referring to fig. 5, the apparatus may specifically include: an obtaining module 501, a determining module 502 and a screening module 503, wherein:
an obtaining module 501, configured to obtain a moving direction of a user when it is determined that a condition for switching out a serving cell is satisfied;
a determining module 502, configured to determine an azimuth arrival angle corresponding to each neighboring cell based on the user moving direction and a signal coverage direction of each neighboring cell;
a screening module 503, configured to determine, based on the azimuth arrival angle, a target neighboring cell that satisfies a preset screening condition in the neighboring cells, where the preset screening condition is used to constrain a value range of the azimuth arrival angle.
Optionally, the determining module 502 is specifically configured to:
determining a direction line of the adjacent cell based on the signal coverage direction of the adjacent cell, wherein the direction line is a normal line corresponding to a midpoint of a curve corresponding to the signal coverage direction; determining position information of an intersection point of a direction line of the adjacent cell and the user moving direction; and determining an angle taking the intersection point as a vertex as an azimuth arrival angle of the adjacent cell based on the position information of the intersection point, the position information of the user equipment and the position information of the base station of the adjacent cell.
Optionally, the obtaining module 501 is further configured to:
when the condition of switching out of the service cell is determined to be met, the moving speed of a user is acquired;
the screening module 503 is specifically configured to:
determining the TA distance between the user equipment and the base station antenna corresponding to each adjacent cell; and determining a target adjacent cell which meets a preset screening condition in the adjacent cells based on the azimuth arrival angle and the TA distance, wherein the preset screening condition is also used for restricting the value range of the TA distance, and the value range of the TA distance is generated according to the user moving speed.
Optionally, the obtaining module 501 is further configured to:
when the condition of switching out of the serving cell is determined to be met, determining the level intensity of each adjacent cell reported by the user equipment;
the screening module 503 is specifically configured to:
and determining a target adjacent cell which meets preset screening conditions in all adjacent cells based on the azimuth arrival angle and the level strength, wherein the preset screening conditions are also used for taking values of preset level strength.
Optionally, the apparatus further comprises:
the neighbor cell evaluation module is used for evaluating each target neighbor cell based on a preset evaluation factor to obtain an optimal target neighbor cell; controlling the user equipment to switch to the optimal target neighbor cell;
wherein the evaluation factors at least comprise interference electrical frequency, quality, load, TA distance.
Optionally, the apparatus further comprises:
a condition determining module, configured to determine a signal coverage direction of the serving cell; determining a direction arrival angle corresponding to the serving cell based on the signal coverage direction and the user moving direction; and if the direction arrival angle exceeds the preset direction arrival angle value range, determining that the condition of switching out the service cell is met.
Optionally, the condition determining module is further configured to:
determining a TA distance between the user equipment and a base station antenna corresponding to a serving cell and the level strength of the serving cell reported by the user equipment; if the TA distance exceeds a preset TA distance value range and the azimuth arrival angle exceeds a preset azimuth arrival angle value range, or the level intensity exceeds a preset level intensity value range and the azimuth arrival angle exceeds a preset azimuth arrival angle value range, or the TA distance exceeds a preset TA distance value range, the azimuth arrival angle exceeds a preset azimuth arrival angle value range and the level intensity exceeds a preset level intensity value range, determining that the condition of switching out of the serving cell is met;
and the preset TA distance value range is generated according to the current user moving speed.
Optionally, the apparatus further comprises:
the function starting module is used for acquiring the position information reported by the user equipment and the level intensity of the serving cell; determining a user movement speed based on the location information; and if the user moving speed and the level strength both reach a switching threshold value and the maintaining time length reaches a time length threshold value, triggering and determining that the condition of switching out the service cell is met.
Therefore, on one hand, the macro base station cell is introduced with the function of switching control based on the user motion trend, so that the selection of the switching adjacent cell has high consistency with the user moving direction, the control of the switching time point has timeliness, the possibility of switching to the adjacent cells in different directions is reduced, and the subsequent switching failure and call drop risks are avoided; the method effectively avoids the frequent switching of the UE terminal moving at high speed among a plurality of different peripheral non-main coverage cells in the prior art, and reduces the negative gain of the switching. On the other hand, the method creatively introduces the weight value comprehensive evaluation of factors such as azimuth arrival angle, level, distance, interference, quality, load and the like to the potential target cell occupied by the planned switching in the 4G network switching judgment, arranges the priority to be optimal, and improves the service quality of voice and data services while keeping the excellent service mobility. The scheme successfully solves the problem that in the prior art, after the switching is finished only according to the strength of the level, the user perception is seriously deteriorated due to the abnormal conditions of interference, quality, load, cross-zone coverage and the like existing in the target cell.
In addition, as for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant points can be referred to the partial description of the method embodiment. It should be noted that, in the respective components of the apparatus of the present specification, the components therein are logically divided according to the functions to be implemented thereof, but the present specification is not limited thereto, and the respective components may be newly divided or combined as necessary.
Fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present disclosure, and referring to fig. 6, the electronic device includes a processor, an internal bus, a network interface, a memory, a non-volatile memory, and possibly hardware required by other services. The processor reads the corresponding computer program from the nonvolatile memory to the memory and then runs the computer program to form the cell switching control device on the logic level. Of course, besides the software implementation, the present specification does not exclude other implementations, such as a logic device or a combination of software and hardware, and the like, that is, the execution subject of the following processing flow is not limited to each logic unit, and may be hardware or a logic device.
The network interface, the processor and the memory may be interconnected by a bus system. The bus may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 6, but this does not indicate only one bus or one type of bus.
The memory is used for storing programs. In particular, the program may include program code comprising computer operating instructions. The memory may include both read-only memory and random access memory and provides instructions and data to the processor. The Memory may include a Random-Access Memory (RAM) and may also include a non-volatile Memory (e.g., at least 1 disk Memory).
The processor is used for executing the program stored in the memory and specifically executing:
when the condition of switching out of the service cell is determined to be met, the moving direction of a user is obtained;
determining an azimuth arrival angle corresponding to each adjacent cell based on the user moving direction and the signal coverage direction of each adjacent cell;
and determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle, wherein the preset screening condition is used for restricting the value range of the azimuth arrival angle.
The method performed by the cell switching controller or the Master node according to the embodiment shown in fig. 5 of the present specification may be implemented in or by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present specification may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present specification may be directly implemented by a hardware decoding processor, or may be implemented by a combination of hardware and software modules in the decoding processor. The software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register and other storage media mature in the field. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.
The cell switching control device may also perform the methods of fig. 1-4 and implement the methods performed by the administrator node.
Based on the same inventive concept, the embodiment of the present specification further provides a computer-readable storage medium storing one or more programs, which when executed by an electronic device including a plurality of application programs, cause the electronic device to execute the cell handover control method provided by the corresponding embodiment of fig. 1 to 4.
All the embodiments in the present specification are described in a progressive manner, and portions similar to each other in the embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
As will be appreciated by one skilled in the art, embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, the description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the description may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk memory, CD-ROM, optical memory, etc.) having computer-usable program code embodied in the medium.
The description has been presented with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the description. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium, such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, the description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the description may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present specification, and is not intended to limit the present specification. Various modifications and alterations to this description will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present specification should be included in the scope of the claims of the present specification.
Claims (10)
1. A cell handover control method, comprising:
when the condition of switching out of the service cell is determined to be met, the moving direction of a user is obtained;
determining the direction-of-arrival angle corresponding to each adjacent cell based on the user moving direction and the signal coverage direction of each adjacent cell;
and determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle, wherein the preset screening condition is used for restricting the value range of the azimuth arrival angle.
2. The method of claim 1, wherein the determining the direction of arrival corresponding to each neighboring cell based on the moving direction of the user and the signal coverage direction of each neighboring cell comprises:
determining a direction line of the adjacent cell based on the signal coverage direction of the adjacent cell, wherein the direction line is a normal corresponding to a midpoint of a curve corresponding to the signal coverage direction;
determining the position information of the intersection point of the direction line of the adjacent cell and the moving direction of the user;
and determining an angle taking the intersection point as a vertex as an azimuth arrival angle of the adjacent cell based on the position information of the intersection point, the position information of the user equipment and the position information of the base station of the adjacent cell.
3. The method of claim 1, further comprising:
when the condition of switching out of the service cell is determined to be met, the moving speed of a user is acquired;
wherein, the determining, based on the direction angle of arrival, a target neighboring cell that satisfies a preset screening condition among the neighboring cells includes:
determining the TA distance between the user equipment and the base station antenna corresponding to each adjacent cell;
and determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle and the TA distance, wherein the preset screening condition is also used for restricting the value range of the TA distance, and the value range of the TA distance is generated according to the user moving speed.
4. The method of claim 1, further comprising:
when the condition of switching out of the serving cell is determined to be met, determining the level intensity of each adjacent cell reported by the user equipment;
wherein, the determining, based on the direction angle of arrival, a target neighboring cell that satisfies a preset screening condition among the neighboring cells includes:
and determining a target adjacent cell which meets preset screening conditions in all adjacent cells based on the azimuth arrival angle and the level strength, wherein the preset screening conditions are also used for taking values of preset level strength.
5. The method of claim 1, further comprising:
based on a preset evaluation factor, evaluating each target adjacent cell to obtain an optimal target adjacent cell;
controlling the user equipment to switch to the optimal target neighbor cell;
wherein the evaluation factors at least comprise interference electrical frequency, quality, load, TA distance.
6. The method of any of claims 1-5, wherein the determining that a condition for switching out of a serving cell is satisfied comprises:
determining a signal coverage direction of the serving cell;
determining an azimuth arrival angle corresponding to the serving cell based on the signal coverage direction and the user moving direction;
and if the direction arrival angle exceeds the range of the preset direction arrival angle, determining that the condition of switching out the serving cell is met.
7. The method of claim 6, wherein the determining that a condition for switching out of a serving cell is satisfied comprises:
determining a TA distance between the user equipment and a base station antenna corresponding to a serving cell and the level strength of the serving cell reported by the user equipment;
if the TA distance exceeds a preset TA distance value range and the azimuth arrival angle exceeds a preset azimuth arrival angle value range, or the level intensity exceeds a preset level intensity value range and the azimuth arrival angle exceeds a preset azimuth arrival angle value range, or the TA distance exceeds a preset TA distance value range, the azimuth arrival angle exceeds a preset azimuth arrival angle value range and the level intensity exceeds a preset level intensity value range, determining that a condition for switching out a serving cell is met;
and the preset TA distance value range is generated according to the current user moving speed.
8. The method of claim 1, further comprising, prior to the determining that the condition for switching out of the serving cell is satisfied:
acquiring position information reported by user equipment and level intensity of a serving cell;
determining a user movement speed based on the location information;
and if the user moving speed and the level strength both reach a switching threshold value and the maintaining time length reaches a time length threshold value, triggering and determining that the condition of switching out the service cell is met.
9. A cell switching control apparatus, comprising:
the acquisition module is used for acquiring the moving direction of a user when the condition of switching out a service cell is determined to be met;
a determining module, configured to determine an azimuth arrival angle corresponding to each neighboring cell based on the user moving direction and a signal coverage direction of each neighboring cell;
and the screening module is used for determining a target adjacent cell which meets preset screening conditions in all adjacent cells based on the azimuth arrival angle, wherein the preset screening conditions are used for restricting the value range of the azimuth arrival angle.
10. A network device, comprising: a communication interface, a processor, and a memory;
the processor invokes program instructions in the memory to perform the following acts:
when the condition of switching out of a service cell is determined to be met, the moving direction of a user is obtained;
determining the direction arrival angle corresponding to each adjacent cell based on the user moving direction and the signal coverage direction of each adjacent cell;
and determining a target adjacent cell which meets a preset screening condition in all adjacent cells based on the azimuth arrival angle, wherein the preset screening condition is used for restricting the value range of the azimuth arrival angle.
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