CN112449380A

CN112449380A - Method, device, base station and storage medium for switching control

Info

Publication number: CN112449380A
Application number: CN201910801717.9A
Authority: CN
Inventors: 彭硕; 龚智辉
Original assignee: Shenzhen Ucloudlink New Technology Co Ltd
Current assignee: Shenzhen Ucloudlink New Technology Co Ltd
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2021-03-05
Anticipated expiration: 2039-08-28
Also published as: CN112449380B

Abstract

The application is applicable to the technical field of mobile communication, and provides a method, a device, a base station and a storage medium for switching control, wherein the method comprises the following steps: after the first trigger condition is met, the moving direction of the first mobile communication equipment is obtained; determining a target cell according to the moving direction and the neighbor cell list; the neighbor cell list comprises the position relation between the neighbor cell and the source cell; sending a pre-switching request to a target base station to which the target cell belongs; the pre-handover request is used for instructing a target base station to configure the target cell to prepare resources for a first mobile communication device; after determining that a handover triggering condition is met, sending a handover control message to the first mobile communication device; the handover control message is for instructing the first mobile communication device to handover to the target cell; the switching method provided by the embodiment of the application can reduce the switching time delay, thereby improving the switching success rate, reducing the packet loss rate and further improving the user experience.

Description

Method, device, base station and storage medium for switching control

Technical Field

The present application belongs to the field of mobile communication technologies, and in particular, to a method, an apparatus, a base station, a terminal, and a storage medium for handover control.

Background

In a mobile communication network in a high-speed railway scene, because mobile communication devices, such as mobile phones, stay in the coverage area of each cell for a very short time, and the measurement and signaling interaction time required for cell residence access, reselection and switching is relatively long, the cell switching failure rate is relatively high, so that the user call drop rate is high or the data communication rate is low, and the user experience is poor.

Disclosure of Invention

The embodiment of the application provides a switching control method, a switching control device, a base station and a storage medium, and can solve the problem of high cell switching failure rate of mobile communication equipment in a high-speed railway scene.

In a first aspect, an embodiment of the present application provides a method for handover control, including:

after the first trigger condition is met, the moving direction of the first mobile communication equipment is obtained; determining a target cell according to the moving direction and the neighbor cell list; the neighbor cell list comprises the position relation between the neighbor cell and the source cell; sending a pre-switching request to a target base station to which the target cell belongs; the pre-handover request is used for instructing a target base station to configure the target cell to prepare resources for a first mobile communication device; after determining that a handover triggering condition is met, sending a handover control message to the first mobile communication device; the handover control message is for instructing the first mobile communication device to handover to the target cell; wherein the first trigger condition is at least one of the following conditions: determining that the first mobile communication device accesses the source cell; determining that a signal quality parameter of the source cell is below a first threshold.

The pre-switching is triggered by the first trigger condition, so that the target cell can be a first mobile communication device resource in advance before the first mobile communication device moves out of the source cell, and the probability of switching failure caused by the combination of the rapid motion of the first mobile communication device and the time delay of the switching process is reduced.

In a second aspect, an embodiment of the present application provides a device for handover control, including:

the first trigger condition determining module is used for acquiring the moving direction of the first mobile communication equipment after the first trigger condition is determined to be met;

a target cell determining module, configured to determine a target cell according to the moving direction and the neighbor cell list; the neighbor cell list comprises the position relation between the neighbor cell and the source cell;

a pre-switching request sending module, configured to send a pre-switching request to a target base station to which the target cell belongs; the pre-handover request is used for instructing a target base station to configure the target cell to prepare resources for a first mobile communication device;

a trigger condition determining module, configured to send a handover control message to the first mobile communication device after determining that a handover trigger condition is satisfied; the handover control message is for instructing the first mobile communication device to handover to the target cell;

wherein the first trigger condition is at least one of the following conditions: determining that the first mobile communication device accesses the source cell; determining that a signal quality parameter of the source cell is below a first threshold.

In a third aspect, an embodiment of the present application provides a base station, including:

comprising a memory, a processor and a computer program stored in said memory and being executable on said processor, characterized in that said processor realizes the method steps of the first aspect described above when executing said computer program.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, including: the computer readable storage medium stores a computer program which, when executed by a processor, performs the method steps of the first aspect described above.

In a fifth aspect, embodiments of the present application provide a computer program product, which, when run on an electronic device, causes the electronic device to perform the method steps of the first aspect.

It is understood that the beneficial effects of the second aspect to the fifth aspect can be referred to the related description of the first aspect, and are not described herein again.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic diagram of mobile communication network coverage along a railway according to an embodiment of the present application;

fig. 2 is a flowchart illustrating a method for handover control according to an embodiment of the present application;

fig. 3 is a schematic diagram of a chain type networking cell according to an embodiment of the present application;

fig. 4 is an interaction flow diagram of a method for handover control according to an embodiment of the present application;

fig. 5 is an interaction flow diagram of a method for handover control according to another embodiment of the present application;

fig. 6 is a flowchart illustrating another method for controlling handover according to an embodiment of the present application;

fig. 7 is a flowchart illustrating another method for controlling handover according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a handover reference area provided in an embodiment of the present application;

fig. 9 is a flowchart illustrating another method for controlling handover according to an embodiment of the present application;

fig. 10 is a flowchart illustrating another method for controlling handover according to an embodiment of the present application;

fig. 11 is a flowchart illustrating another method for controlling handover according to an embodiment of the present application;

fig. 12 is a schematic diagram of a handover control apparatus according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a base station according to an embodiment of the present application.

Detailed Description

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

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

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

As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".

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

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

Fig. 1 is a schematic diagram illustrating coverage of a mobile communication network along a railway according to an embodiment of the present invention, and as shown in fig. 1, the mobile communication network along the railway 01 is covered by cells 110 of each base station 10, and provides communication services for mobile communication devices 02, such as mobile phones, under the coverage of each cell. When the train runs in one direction, the mobile communication device 02 on the train is switched from the source cell currently providing mobile communication service to the neighboring cell due to the change of the cell coverage.

Herein, a cell currently providing a communication service for a mobile communication device is referred to as a source cell or a serving cell, and a base station to which the source cell belongs is referred to as a source base station. Alternatively, the cell near the source cell that can provide communication service to the mobile communication device is referred to as a neighbor cell. The cell into which the mobile communication device is to be handed over to provide communication service for the mobile communication device is referred to as a target cell, and the base station to which the target cell belongs is referred to as a target base station.

The mobile communication device may be a mobile phone, a tablet computer, a wearable device, an in-vehicle device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), and other terminal devices, and the embodiment of the present application does not limit the specific type of the mobile communication device.

For example, in a Long Term Evolution (LTE) system, when a train runs fast, there is a certain probability that a mobile communication device in the train moves to an overlapping zone of a source cell and a neighboring cell edge to meet a condition for reporting an event that a neighboring cell signal quality parameter is higher than that of the source cell signal quality parameter, which is an a3 event in the LTE system, and measuring a report. The interference of the cell overlapping zone is serious, and the switching failure rate is high. Especially in the inter-frequency handover scenario, handover failure is more likely to occur due to the prolonged inter-frequency measurement. If the signal intensity of the serving cell of the mobile communication equipment is detected to be not more than the signal intensity of the target adjacent cell as the pre-switching judgment condition, the probability is high that when the source base station sends a switching control message to indicate that the mobile communication equipment is switched to the target cell, the mobile communication equipment is already moved out of the coverage area of the source cell, so that the mobile communication equipment cannot receive the switching control message, and further the switching failure is caused.

In order to solve the above problem, after detecting that the mobile communication device enters the source cell, the source base station sends a measurement control message to instruct the mobile communication device to periodically report a measurement report, and the measurement report carries the location information of the mobile communication device. After the source base station detects the first trigger condition, the source base station determines the corresponding adjacent cell with the same moving direction as the mobile communication equipment as the target cell according to the moving direction of the mobile communication equipment and the position relation between the source cell and the adjacent cell in the adjacent cell list, and sends a pre-switching request to the target base station to which the target cell belongs so as to indicate the target base station to configure the target cell and prepare related resources for the mobile communication equipment. The source base station determines that the switching trigger condition is met through the measurement report reported by the mobile communication equipment, namely, the source base station sends a switching control message to the mobile communication equipment and indicates the mobile communication equipment to be directly switched to the target cell. The pre-handover is triggered by the first trigger condition, so that the target cell can allocate resource information such as a lead code, an X2 interface Protocol ID (X2 Application Protocol ID, X2AP ID) and an Evolved Radio Access Bearer (E-RAB) to the mobile communication device in advance, and the probability of handover failure caused by the combination of the fast motion of the mobile communication device and the time delay of a handover process is reduced.

Wherein the first trigger condition includes but is not limited to: detecting that a mobile communication device accesses a source cell; or detecting that the signal quality parameter of the source cell is below a first threshold.

Wherein the handover trigger conditions include, but are not limited to: detecting that the mobile communication device enters a handover reference area; or detecting that the quality parameter of the neighboring cell signal is higher than that of the source cell, for example, receiving a measurement report that the quality parameter of the neighboring cell signal sent by the mobile communication device is higher than that of the source cell; specifically, event measurement report such as a 3; or detecting that the signal quality parameter of the target neighbor cell is higher than a preset threshold value.

On the other hand, the base stations along the railway obtain a switching reference area by counting and updating in real time the position of the mobile communication device successfully switched to the adjacent cell when reporting the A3 measurement report, for example, an A3 event, because the signal quality parameter of the adjacent cell in each cell is higher than the signal quality parameter of the source cell, and the central position of the switching reference area is used as a switching reference point. Since the handover reference area is determined by counting the intervals in which the handover to the target cell is successful due to the a3 event, the signal quality parameter of the target cell in the handover reference area may have a higher probability than the signal quality parameter of the source cell. Switching the mobile communication equipment to a target cell with ready resources immediately after detecting that the mobile communication equipment enters a switching reference area, wherein the mobile communication equipment can be switched to the target cell at a position with a higher probability that the signal quality parameter of the target cell is higher than that of a source cell because the mobile communication equipment rapidly enters the target cell; even if the signal quality parameter of the target cell is not higher than that of the source cell during switching, due to the characteristics of railway operation, the mobile communication equipment will inevitably enter the area where the signal quality parameter of the target cell is higher than that of the source cell; and the problem of switching failure caused by moving out of the coverage of the source cell in time of not receiving the switching control message of the source base station when the signal of the target cell is measured to be higher than that of the source cell because the mobile communication equipment moves rapidly is avoided. The switching method provided by the embodiment of the application can reduce the switching time delay, thereby improving the switching success rate, reducing the packet loss rate and further improving the user experience.

Further, the operating speed of the mobile communication device is detected before the measurement control message is sent to the mobile communication device. The measurement control strategy provided by the embodiment of the application is determined according to the running speed of the mobile communication equipment. The measurement and handover control strategy described above is employed when it is determined that the operating speed of the mobile communication device is greater than a second threshold. The switching strategy provided by the embodiment of the application is adopted only under the condition that the mobile communication equipment moves fast, so that the switching failure or the reduction of the communication quality and the corresponding expense of a mobile communication network caused by the switching method provided by the embodiment of the application when the mobile communication equipment moving at low speed needs to provide communication service along the railway is avoided when the mobile communication equipment moving at low speed is too low.

Further, the neighbor cell of the source cell is set as a chain type neighbor cell by setting a neighbor cell list, and the neighbor cell information of the chain type neighbor cell includes a positional relationship such as a direction of the neighbor cell with respect to the source cell, and the handover reference region information. The handover reference area information may be handover reference point location information. According to the characteristics of railway operation, the operation direction of the mobile communication equipment is determined on the whole and cannot be changed easily, so that the target cell which the mobile communication equipment is about to enter can be determined according to the movement direction of the mobile communication equipment and the position relation between the adjacent cell and the source cell. So that the determined target cell can be requested in advance to prepare resources for the mobile communication device. In addition, a target cell can be determined according to the motion direction of the mobile communication equipment through a neighbor cell list of the chain type networking, and when the signal quality parameter of a neighbor cell at the position opposite to the motion direction of the mobile communication equipment is higher than that of a source cell in an unexpected occurrence, the mobile communication equipment can be prevented from being switched into the cell opposite to the motion direction due to the known position relation among the cells.

Further, the base station determines that the source cell and the neighboring cell are the inter-frequency cell or the inter-system cell, and then adopts the measurement and switching control strategy provided by the embodiment of the application. In the scene of different frequencies or different systems, the mobile communication equipment can only measure during the measurement time slot (GAP), so that the measurement time is long, the switching time is prolonged, and the switching failure rate is high under the condition that the mobile communication equipment moves rapidly. By adopting the switching method provided by the embodiment of the application, the target cell can be appointed for the mobile communication equipment at an earlier time generally before the signal quality parameter of the adjacent cell is detected to be not lower than that of the source cell, and the relevant resources are prepared for the mobile communication equipment, so that a higher switching success rate compared with the prior art can be obtained, and the user experience is further improved.

It should be noted that, for easier understanding of the present application, the embodiments of the present application are mainly described in conjunction with the LTE system, but the present application is not limited to the embodiments. Those skilled in the art can apply the method, apparatus, base station and storage medium for handover control provided in the embodiments of the present application to different mobile communication systems, for example, a fifth-Generation (5G) network, and future mobile communication systems, under the teaching of the embodiments of the present application to obtain the same or similar effects of the embodiments of the present application.

It is understood that the method, apparatus, base station and storage medium for handover control provided in the embodiments of the present application may be applied to a mobile communication network providing communication services for fast-running traffic lines with relatively fixed running directions, for example, a mobile communication network providing mobile communication services for expressways.

Example one

Fig. 2 illustrates a method for handover control according to an embodiment of the present application, which is applied to the base station 10 in the mobile communication system illustrated in fig. 1, and can be implemented by the base station through software/hardware. As shown in fig. 2, the method includes steps S110 to S140. The specific realization principle of each step is as follows:

s110, after the first trigger condition is determined to be met, the moving direction of the first mobile communication device is obtained.

The first mobile communication device may be a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an AR/VR device, a notebook computer, a UMPC, a netbook, a PDA, or other terminal devices, and the embodiment of the present application does not limit the specific type of the first mobile communication device.

Wherein the Signal Quality parameter includes at least one of Reference Signal Receiving Power (RSRP) and Reference Signal Receiving Quality (RSRQ).

Wherein, the obtaining of the moving direction of the first mobile communication device comprises at least one of the following modes: determining a direction of movement of the first mobile communication device by the location information in the measurement report sent by the first mobile communication device; and determining the moving direction of the first mobile communication device by detecting the Doppler frequency shift result of the signal transmitted by the first mobile communication device.

In a non-limiting example, after detecting that the first mobile communication device accesses the source cell, or after detecting that the signal quality parameters, such as RARP and RSRQ, of the source cell where the first mobile communication device is located are lower than the first threshold, the base station to which the source cell where the first mobile communication device is located belongs. The base station obtains the moving direction of the first mobile communication device, for example, obtains the position information of the first mobile communication device through a satellite positioning navigation device built in the first mobile communication device, and obtains the position information of the first mobile communication device through a2 and A3 measurement reports periodically sent to the base station by the first mobile communication device.

In one non-limiting example, the source base station determines that the signal quality parameter of the source cell is below a first threshold by receiving a measurement report sent by the first mobile communication device, such as an a2 event measurement report.

S120, determining a target cell according to the moving direction and the neighbor cell list; the neighbor cell list includes the location relationship between the neighbor cell and the source cell.

The adjacent cells comprise two adjacent cells before and after the source cell along a traffic line; the location relationship includes direction information of each of the neighboring cells with respect to the source cell.

In one non-limiting example, as shown in fig. 3, cell a, cell B, and cell C are chain-type networking cells. And configuring a cell A as a neighbor cell of the cell B, and configuring a cell C as the neighbor cell of the cell B. The neighboring cell information of each cell includes the position relationship of the neighboring cell with respect to the source cell, for example, cell a is located in the downlink direction of cell B, and cell C is located in the uplink direction of cell B. When the source base station detects that the moving direction of the first mobile communication device in a source cell, such as a cell B, is an uplink direction, it determines a cell C located in the uplink direction of the cell B in a neighbor cell list of the cell B as a target cell.

It will be appreciated by those skilled in the art that the foregoing examples are for the purpose of better understanding and are not intended to limit the present application. The purpose of the present application can be achieved by setting the position relation parameters according to the practical situation by those skilled in the art under the teaching of the embodiments of the present application.

S130, sending a pre-switching request to a target base station to which the target cell belongs; the pre-handover request is used to instruct a target base station to configure the target cell to prepare resources for a first mobile communication device.

The target cell prepares resources for the first mobile communication device, including but not limited to allocating resources such as preamble, X2AP ID, and E-RAB to the first mobile communication device in advance. So that the target cell can accept the handover of the first mobile communication device to the target cell at any time.

In one non-limiting example, the target cell and the source cell belong to the same base station, which sends a pre-handover request in the base station, and the base station allocates resources, including but not limited to resources such as an air interface, to the target cell through a signaling procedure in the base station.

In a non-limiting example, the target is smaller than and belongs to a different base station from the source cell, and the source base station to which the source cell belongs sends the pre-handover request to the target base station in the target cell through an interface protocol. For example, in the LTE system, the pre-handover request is directly transmitted to the target base station through an X2 interface, or is transmitted to the target base station through a Mobility Management Entity (MME) using an S1 interface. And the target base station allocates resources such as a lead code, an E-RAB and the like for the target cell after receiving the pre-switching request. So that the target cell can accept the handover of the first mobile communication device to the target cell at any time.

It can be understood that, those skilled in the art can implement the method for sending the pre-handover request according to the interface protocol of the mobile communication system actually deployed, so as to achieve the purpose of allocating resources to the first mobile communication device in advance, so that the target cell can accept the handover of the first mobile communication device to the target cell at any time.

S140, after determining that the handover trigger condition is satisfied, sending a handover control message to the first mobile communication device; the handover control message is used to instruct the first mobile communication device to handover to the target cell.

Wherein a handover triggering condition includes, but is not limited to, determining that the first mobile communication device enters the handover reference area, and determining that the signal quality parameter of the target cell is higher than the signal quality parameter of the source cell according to the measurement report sent by the first mobile communication device.

In one non-limiting example, a source base station issues a handover control message to a first mobile communication device; after receiving the handover control message, the first mobile communication device directly switches to the target cell for which resources are prepared for the first mobile communication device according to the handover control message.

As shown in fig. 4, in a non-limiting example, in the LTE system, after the source base station detects that the first mobile communication device accesses the source cell, the source base station determines that the moving direction of the first mobile communication device is the uplink direction through the first mobile communication device location information in the measurement report periodically reported by the first mobile communication device, or according to the result of detecting the doppler shift of the signal sent by the first mobile communication device. And the source base station determines the neighbor cell in the uplink direction as the target cell according to the moving direction of the first mobile communication device and the position relation between the neighbor cell and the source cell in the neighbor cell list of the chain type neighbor cell stored by the source base station. And the source base station sends a pre-switching request to the target base station to which the target cell belongs through the MME, and the target base station configures the target cell to prepare resources for the first mobile communication equipment after receiving the pre-switching request. In a preferred non-limiting example, the target base station sends a pre-handover ready message to the source base station identifying that the resources are ready after the target cell prepares the resources for the first mobile communication device. After detecting that the first mobile communication device enters the handover reference area, or receiving an event reported by the first mobile communication device as a3, the source base station immediately sends a handover Control message to the first mobile communication device, and the first mobile communication device sends a Radio Resource Control (RRC) reconfiguration end message to the target base station after receiving the handover Control message to access the target base station.

As shown in fig. 5, in a non-limiting example, in the LTE system, after the source base station receives an a2 event measurement report reported by the first mobile communication device, the source base station determines that the moving direction of the first mobile communication device is the uplink direction through the first mobile communication device location information in the measurement report periodically reported by the first mobile communication device, or according to a result of detecting a doppler shift of a signal sent by the first mobile communication device. And the source base station determines the neighbor cell in the uplink direction as the target cell according to the moving direction of the first mobile communication device and the position relation between the neighbor cell and the source cell in the neighbor cell list of the chain type neighbor cell stored by the source base station. And the source base station sends a pre-switching request to the target base station to which the target cell belongs through the MME, and the target base station configures the target cell to prepare resources for the first mobile communication equipment after receiving the pre-switching request. In a preferred example, the target base station sends a resource ready message to the source base station after the target cell has prepared resources for the first mobile communication device. And the source base station immediately sends a switching control message to the first mobile communication equipment after detecting that the first mobile communication equipment enters the switching reference area, and the first mobile communication equipment sends an RRC reconfiguration ending message to the target base station to access the target base station after receiving the switching control message.

In a non-limiting example, in the LTE system, after the source base station receives the measurement report of the a2 event reported by the first mobile communication device, or detects that the first mobile communication device enters the source cell, the source base station determines that the moving direction of the first mobile communication device is the uplink direction through the first mobile communication device location information in the measurement report periodically reported by the first mobile communication device, or according to the result of detecting the doppler shift of the signal sent by the first mobile communication device. And the source base station determines the neighbor cell in the uplink direction as the target cell according to the moving direction of the first mobile communication device and the position relation between the neighbor cell and the source cell in the neighbor cell list of the chain type neighbor cell stored by the source base station. And the source base station sends a pre-switching request to the target base station to which the target cell belongs through the MME, and the target base station configures the target cell to prepare resources for the first mobile communication equipment after receiving the pre-switching request. In a preferred example, the target base station sends a resource ready message to the source base station after the target cell has prepared resources for the first mobile communication device. After detecting that the first mobile communication equipment enters a switching reference area or reporting an A3 event measurement report, the source base station immediately sends a switching control message to the first mobile communication equipment, and the first mobile communication equipment sends an RRC reconfiguration end message to the target base station to access the target base station after receiving the switching control message. It will be appreciated that the source base station detects the first mobile communications device entering the handover reference area, or detects the first mobile communications device reporting an a3 event measurement report, the first detected one of these two handover trigger conditions preferably triggering the source base station to issue a handover control message to the first communications device. When detecting that the first mobile communication device enters the handover reference area or detecting that the first mobile communication device reports an a3 event measurement report, the source base station selects any one of the handover trigger conditions to trigger sending a handover control message to the first communication device.

It will be appreciated by those skilled in the art that the above examples are for easier understanding of the present application. It is understood that the alternative embodiments of the specific examples may be substituted or combined with each other as appropriate.

On the basis of the handover control method provided by the embodiment shown in fig. 2, another handover control method shown in fig. 6 according to the embodiment of the present application further includes, in step S140, determining any time before the handover trigger condition is satisfied, further including:

s101, after determining that the first mobile communication equipment is accessed to the source cell, sending a measurement control message to the first mobile communication equipment; the measurement control message is used to instruct the first mobile communication device to periodically send a measurement report, which includes location information of the first mobile communication device.

It will be appreciated that step S101 may be performed at any time after the first mobile communications device is determined to be accessing the source cell, until the first communications device is determined to satisfy the handover trigger condition.

In one non-limiting example, after detecting that the first mobile communication device is accessed to the source cell, the source base station sends a measurement control message to the first mobile communication device, indicating that the first mobile communication device periodically sends measurement reports. For example, in the LTE system, the measurement report includes, but is not limited to, a2, A3 measurement report. The first mobile communication device transmits a measurement report to the source base station according to the measurement control message period. The measurement report includes location information of the first mobile communication device. The position information of the first mobile communication device includes, but is not limited to, position information obtained by a satellite positioning and navigation device built in the first mobile communication device, and position information obtained by base station positioning.

On the basis of the handover control method provided by the embodiment shown in fig. 2, another handover control method shown in the embodiment of the present application shown in fig. 7, in step S140, the determining that the handover trigger condition is satisfied includes at least one of:

s140', determining that the first mobile communication device enters a handover reference area; and the combination of (a) and (b),

determining that the signal quality parameter of the target cell is higher than the signal quality parameter of the source cell based on the measurement report sent by the first mobile communication device.

The handover reference region may be a region preset by a region in which a neighboring cell signal quality parameter obtained in advance through drive test is higher than a source cell signal quality parameter, but is not limited to the above; it may also be an area obtained by the first mobile communication device successfully switching to the location information of the neighboring cell through a real-time statistic and update event that the neighboring cell signal quality parameter is higher than the source cell signal quality parameter, for example, an a3 event.

Non-limiting, determining that the first mobile communication device enters a handover reference area comprises: obtaining location information of a first mobile communication device by receiving a message containing a location of the first mobile communication device sent by the first mobile communication device; determining that the first mobile communication device enters a handover reference area based on the location information.

Non-limiting, determining that the first mobile communication device enters a handover reference area comprises: obtaining the location information of the first mobile communication device through the measurement report sent by the first mobile communication device; determining that the first mobile communication device enters the handover reference area according to the location information of the first mobile communication device. Including but not limited to a2 and A3 measurement reports.

As shown in fig. 8, the overlapping area of the source cell 111 and the target cell 112 is 120, a handover reference area 121 is obtained by presetting or by detecting a position where the first mobile communication device successfully hands over to the target cell, and a handover reference point 122. In one non-limiting example, it is determined that the first mobile communication device enters the handover reference area by detecting whether the location of the first mobile communication device is less than the distance of the handover reference point to the handover reference area boundary. In another non-limiting example, whether the first mobile communication device enters the handover reference zone is determined by detecting whether a projection of the position of the first mobile communication device on a coordinate axis exceeds a handover reference zone boundary in a direction of travel of the first mobile communication device. In another non-limiting example, whether the first mobile communication device enters the handover reference area is determined by detecting and calculating whether the location of the first mobile communication device falls within the handover reference area boundary coordinate range.

The source base station sends a handover control message to the first mobile communication device to instruct the first mobile communication device to handover to the target cell by detecting and determining that the first mobile communication device enters the handover reference area. Because the signal quality parameter of the target adjacent cell set as a high probability in the switching reference area is higher than the signal quality parameter of the source cell, when the first mobile communication equipment is detected to enter a preset area, the first mobile communication equipment is switched to the target cell with ready resources, and because the first mobile communication equipment quickly enters the target cell, the signal quality parameter of the target cell is switched to the target cell at a position with a high probability higher than the signal quality parameter of the source cell; even if the signal quality parameter of the target cell is not higher than that of the source cell during switching, the first mobile communication equipment will inevitably enter the area where the signal quality parameter of the target cell is higher than that of the source cell due to the characteristic that the railway running direction is relatively single; and the problem of switching failure caused by moving out of the coverage of the source cell in time of not receiving the switching control message of the source base station when the signal of the target cell is measured to be higher than that of the source cell because the first mobile communication equipment moves fast is avoided. The switching method provided by the embodiment of the application can reduce the switching time delay, thereby improving the switching success rate, reducing the packet loss rate and further improving the user experience.

In one non-limiting example, the source base station determines that the signal quality parameter of the target cell is higher than the signal quality parameter of the source cell based on the a3 measurement report sent by the first mobile communication device.

Immediately handing over the first mobile communication device to a target cell for which resources have been prepared for the first mobile communication device by detecting that the signal quality parameter of the target cell is higher than the signal quality parameter of the source cell as determined from the measurement report sent by the first mobile communication device. The time occupied by the signaling flow of the switching preparation can be reduced, the switching time delay is reduced, and the problem that the switching control message sent by the source base station cannot be received after the first mobile communication equipment moves out of the coverage area of the source cell due to the combination of the rapid operation of the railway and the time delay of the switching signaling flow is avoided with high probability. Therefore, the switching success rate is improved, and the user experience is further improved.

In one non-limiting example, the source base station detects that the first mobile communication device enters the handover reference area, or detects that the first mobile communication device reports an a3 event measurement report, and the first detected one of the two handover trigger conditions preferentially triggers the source base station to send a handover control message to the first communication device. When detecting that the first mobile communication device enters the handover reference area or detecting that the first mobile communication device reports an a3 event measurement report, the source base station selects any one of the handover trigger conditions to trigger sending a handover control message to the first communication device. By judging the two switching trigger conditions, the first triggering condition can preferentially trigger the source base station to send the switching control message to the first mobile communication equipment, so that the switching timeliness is further improved, the switching success rate is further improved, and the user experience is improved.

On the basis of the handover control method provided by the embodiment shown in fig. 6, another handover control method shown in fig. 9 according to the embodiment of the present application further includes, before determining that the first mobile communication device enters the handover reference area in step S140':

s135, counting the location information of the first mobile communication device that is switched from the source cell to each neighboring cell and is successfully switched, and obtaining a handover reference area.

In one non-limiting example, the handover reference region is obtained by a method of clustering location information. The clustering calculation includes, but is not limited to, a k-means clustering algorithm, a hierarchical clustering algorithm, a self-organizing map clustering algorithm, and a fuzzy c-means clustering algorithm. The center point of the cluster acquisition area is used as a switching reference point, and the center point includes but is not limited to an arithmetic or weighted arithmetic mean point. In another non-limiting example the boundary of the handover reference region is determined by fitting sample points of the position information.

Wherein the switching is caused by the signal quality parameter of the neighboring cell being higher than the signal quality parameter of the source cell. For example, the switch is to a switch due to an a3 event.

In one non-limiting example, obtaining a handover reference region comprises: obtaining switching reference point position information by counting the mean value of the position information; and determining a switching reference area according to the switching reference point position information.

Without limitation, the position information of the switching reference point is obtained by calculating the coordinates of each position information, including but not limited to an arithmetic mean and a weighted mean, and the switching reference area is obtained by fitting the coordinate point corresponding to the position information at the farthest distance from the switching reference point for each angle.

And in a non-limiting way, by projecting the coordinates of each piece of position information to a coordinate axis parallel to the railway line, calculating the mean value of projection points on the coordinate axis, and taking the obtained reference point as a switching reference point. And the area between the two farthest projection points in the left and right sections of the switching reference point is used as a switching reference area.

By counting the position information of the first mobile communication device which is switched from the source cell to each neighbor cell and is successfully switched, the switching reference region is obtained, the range of the switching reference region can be updated in real time, and the probability that the signal quality parameter of the target neighbor cell of the switching reference region is higher than that of the source cell can be improved under the condition that the cell coverage signal of the mobile communication network is changed under the influence of factors such as environment or load. Therefore, the probability of successful switching of the first mobile communication device to the target cell in the switching reference area is improved. And thus better user experience is obtained.

On the basis of the method for handover control provided by the embodiment shown in fig. 9, in step S135, after obtaining the handover reference area, the method further includes:

and storing the position information of the switching reference point in the corresponding neighbor cell information of the neighbor cell list.

In a non-limiting example, the base station stores the coordinate information of the position of the switching reference point in a data table of the neighbor information where the switching reference point is located in the neighbor list.

On the basis of the handover control method provided by the embodiment shown in fig. 2, another handover control method shown in the embodiment of the present application shown in fig. 10 further includes, before determining that a handover trigger condition is satisfied, step S110:

s102, determining that the speed of the first mobile communication device is larger than a second threshold value.

In one non-limiting example, the moving speed of the first mobile communication device is determined by detecting a doppler shift result of the first mobile communication device, or the speed of the first mobile communication device is obtained by detecting a change in a satellite positioning navigation position of the first mobile communication device within a preset time period. When it is determined that the speed of the first mobile communication device is greater than the second threshold, for example 250 km/h, it can be assumed that the first mobile communication device is in a fast moving state, which may cause the above problem with a high probability. It should be understood by those skilled in the art that the second threshold value can be obtained through drive test or statistics, and is not described herein. The operating speed of the first mobile communication device is detected before it is determined that the handover trigger condition is met. Whether to adopt the measurement control strategy provided by the embodiment of the application is determined according to the running speed of the first mobile communication equipment. The handover strategy provided by the embodiment of the present application can be adopted only when the first mobile communication device moves fast, so that handover failure or communication quality degradation caused by the handover method provided by the embodiment of the present application when the speed of the first mobile communication device moving at a low speed is too low can be avoided.

On the basis of the handover control method provided by the embodiment shown in fig. 2, another handover control method shown in fig. 11 in the embodiment of the present application further includes, before determining that a handover trigger condition is satisfied, step S110:

s103, determining that the source cell and the adjacent cell are different-frequency cells or different-system cells.

The pilot frequency cell means that the center frequency points of the source cell and the neighboring cell are different. The inter-system cell means that network systems of a source cell and a neighboring cell are different, for example, the source cell is an LTE network cell, and the neighboring cell is a Wideband Code Division Multiple Access (W-CDMA) network cell. The method comprises the steps of determining that a source cell and a neighboring cell are pilot frequency or inter-system networking, and under the scene of pilot frequency or inter-system networking, because the first mobile communication equipment can only measure during the GAP period, the measurement time is long, the switching time is prolonged, and the switching failure rate is high under the condition that the first mobile communication equipment moves fast. By adopting the handover method provided by the embodiment of the application, the target cell can be designated for the first mobile communication device at an earlier time generally before the signal quality parameter of the adjacent cell is detected to be not lower than that of the source cell, and the relevant resources are prepared for the first mobile communication device, so that a higher handover success rate compared with the prior art can be obtained, and the user experience is further improved.

It should be noted that, the step numbers of the above embodiments are provided for convenience of understanding, and those skilled in the art can arrange and combine the steps of the switching control method provided in the embodiments of the present application according to actual situations.

Example two

Corresponding to the method of handover control shown in fig. 2, fig. 12 shows a device of handover control provided in an embodiment of the present application, where the device of handover control is configured in the base station 10 shown in fig. 1, and includes:

a first trigger condition determining module M110, configured to obtain a moving direction of the first mobile communication device after determining that the first trigger condition is met;

a target cell determining module M120, configured to determine a target cell according to the moving direction and the neighboring cell list; the neighbor cell list comprises the position relation between the neighbor cell and the source cell;

a pre-handover request sending module M130, configured to send a pre-handover request to a target base station to which the target cell belongs; the pre-handover request is used for instructing a target base station to configure the target cell to prepare resources for a first mobile communication device;

a triggering condition determining module M140, configured to send a handover control message to the first mobile communication device after determining that a handover triggering condition is met; the handover control message is for instructing the first mobile communication device to handover to the target cell;

wherein the first trigger condition is at least one of the following conditions:

determining that the first mobile communication device accesses the source cell;

determining that a signal quality parameter of the source cell is below a first threshold.

It is understood that various embodiments and combinations of the embodiments in the above embodiments and their advantages are also applicable to this embodiment, and are not described herein again.

Fig. 13 is a schematic structural diagram of a base station according to an embodiment of the present application. As shown in fig. 13, the base station D13 of this embodiment includes: at least one processor D130 (only one is shown in fig. 13), a memory D131, and a computer program D132 stored in the memory D131 and executable on the at least one processor D130, wherein the processor D130 implements the steps of any of the various method embodiments described above when executing the computer program D132. Alternatively, the processor D130, when executing the computer program D132, implements the functions of the modules/units in the above device embodiments, such as the functions of the modules M110 to M130 shown in fig. 13.

The base station D13 may be a general-purpose computing device such as a desktop computer, a notebook, a palm computer, and a cloud server, which includes a radio frequency module and is used as a base station, and a special base station device in a mobile communication system. The base station may include, but is not limited to, a processor D130, a memory D131. Those skilled in the art will appreciate that fig. 13 is merely an example of the base station D13 and does not constitute a limitation on the base station D13, and may include more or less components than those shown, or some components in combination, or different components, such as input output devices, network access devices, etc.

The Processor D130 may be a Central Processing Unit (CPU), and the Processor D130 may be other general purpose processors, 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, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory D131 may in some embodiments be an internal storage unit of the base station D13, such as a hard disk or a memory of the base station D13. The memory D131 may also be an external storage device of the base station D13 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, provided on the base station D13. Further, the memory D131 may also include both an internal storage unit of the base station D13 and an external storage device. The memory D131 is used for storing an operating system, an application program, a BootLoader (BootLoader), data, and other programs, such as program codes of the computer programs. The memory D131 may also be used to temporarily store data that has been output or is to be output.

It should be noted that, for the information interaction, execution process, and other contents between the above-mentioned devices/units, the specific functions and technical effects thereof are based on the same concept as those of the embodiment of the method of the present application, and specific reference may be made to the part of the embodiment of the method, which is not described herein again.

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

The embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the above-mentioned method embodiments.

Embodiments of the present application provide a computer program product, which when executed on a base station, enables the base station to implement the steps in the above method embodiments.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium and can implement the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a photographing apparatus/terminal apparatus, a recording medium, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signal, telecommunication signal, and software distribution medium. Such as a usb-disk, a removable hard disk, a magnetic or optical disk, etc. In certain jurisdictions, computer-readable media may not be an electrical carrier signal or a telecommunications signal in accordance with legislative and patent practice.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

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

In the embodiments provided in the present application, it should be understood that the disclosed apparatus/network device and method may be implemented in other ways. For example, the above-described apparatus/network device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A method of handover control, comprising:

after the first trigger condition is met, the moving direction of the first mobile communication equipment is obtained;

determining a target cell according to the moving direction and the neighbor cell list; the neighbor cell list comprises the position relation between the neighbor cell and the source cell;

sending a pre-switching request to a target base station to which the target cell belongs; the pre-handover request is used to instruct the target base station to configure the target cell to prepare resources for a first mobile communication device;

after determining that a handover triggering condition is met, sending a handover control message to the first mobile communication device; the handover control message is for instructing the first mobile communication device to handover to the target cell;

2. The method of claim 1, prior to determining that a handover trigger condition is satisfied, further comprising:

after determining that a first mobile communication device accesses the source cell, sending a measurement control message to the first mobile communication device; the measurement control message is used to instruct the first mobile communication device to periodically send a measurement report, which includes location information of the first mobile communication device.

3. The method of claim 1 or 2, wherein determining that the source cell signal quality parameter is below a first threshold comprises:

determining that the signal quality parameter of the source cell is below a first threshold by receiving a measurement report sent by the first mobile communication device.

4. The method of claim 3, wherein the measurement report is an A2 event measurement report.

5. The method of claim 2, wherein obtaining the direction of movement of the first mobile communication device comprises at least one of:

determining the direction of movement by the location information in the measurement report sent by the first mobile communication device; and the combination of (a) and (b),

and determining the moving direction by detecting the Doppler frequency shift result of the signal transmitted by the first mobile communication equipment.

6. The method of claim 1 or 2,

the adjacent cells comprise two adjacent cells before and after the source cell along a traffic line;

the location relationship includes direction information of each of the neighboring cells with respect to the source cell.

7. The method of claim 1 or 2, wherein the determining that a handover trigger condition is satisfied comprises at least one of:

determining that the first mobile communication device enters a handover reference area; and the combination of (a) and (b),

8. The method of claim 7, wherein determining that the first mobile communication device enters a handover reference area comprises:

obtaining the location information of the first mobile communication device through the measurement report sent by the first mobile communication device;

determining that the first mobile communication device enters the handover reference area according to the location information.

9. The method of claim 7, prior to determining that the first mobile communication device enters a handover reference area, further comprising:

counting the position information of the first mobile communication device which is switched to each adjacent cell from the source cell and is successfully switched to obtain a switching reference area;

wherein the switching is caused by the signal quality parameter of the neighboring cell being higher than the signal quality parameter of the source cell.

10. The method of claim 9, wherein obtaining a handover reference region comprises:

obtaining switching reference point position information by counting the mean value of the position information;

and determining a switching reference area according to the switching reference point position information.

11. The method of claim 10, wherein after obtaining the handover reference region, further comprising:

12. The method of claim 9, wherein the switching to switching due to the neighbor cell having a higher signal quality parameter than the source cell comprises:

the switch is a switch due to the a3 event.

13. The method of claim 7, wherein the measurement report is an A3 event measurement report.

14. The method of claim 2, prior to determining that a handover trigger condition is satisfied, further comprising:

determining that the velocity of the first mobile communication device is greater than a second threshold.

15. The method of claim 2, prior to determining that a handover trigger condition is satisfied, further comprising:

and determining that the source cell and the adjacent cell are pilot frequency cells or inter-system cells.

16. A handover controlled apparatus, comprising:

17. A base station comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 15 when executing the computer program.

18. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 15.