CN106535271A - Switching method and device - Google Patents

Abstract

The present invention discloses a handover method and device, comprising: receiving measurement information reported by a UE, wherein the measurement information includes reference signal received quality RSRQ and reference signal received power RSRP of X cells; the X cells include Y cells in the source cell group where the UE is located and Z cells that do not belong to the source cell group; judge whether it is necessary to switch cell groups for the UE according to the measurement information and preset switching conditions; when it is determined that it is necessary When switching a cell group for the UE, determine a target cell group for the UE, and switch the UE from the source cell group to the target cell group. Through the above technical solution, the number of times the UE triggers handover events can be reduced, the signaling overhead of the core network can be reduced, and the communication quality of the user can be improved at the same time.

Description

A switching method and device

technical field

The invention relates to wireless communication technology, in particular to a switching method and device.

Background technique

In recent years, the rapid development of broadband mobile communication technology has become an indispensable part of economic and social development and an important part of economic growth. People are also becoming more and more dependent on communication. As for the development direction of mobile communication, according to predictions, by 2020, the system capacity—that is, the data generated per unit area will be much higher than the current network, reaching 1000 times the current one. Greater capacity places higher demands on the entire network. Among them, the method to improve the network capacity is to introduce small cells (small cells), that is, nodes with smaller coverage and lower power, into the original cellular network to form a heterogeneous network. However, the introduction of small cells also brings some problems. First of all, due to the large gap between the power of the small cell and the power of the traditional macro base station, there is an obvious problem of unbalanced uplink and downlink, that is, when the user equipment (User Equipment, UE) is in a specific location, the uplink and downlink services are the best The base stations are not the same base station, and the unbalanced uplink and downlink problems will cause serious interference. Secondly, with the deployment of heterogeneous networks, when a UE moves in a certain area, the residence time in a specific cell decreases, while the number of handovers increases, the handover failure rate increases, and the problem of ping-pong handover is obvious. These problems will be more prominent when the UE is moving at high speed. In addition, in a heterogeneous network, small cells will be interfered by higher-power macro base stations, so handover signaling errors are prone to occur; the increase in the number of unit cells will not only bring about mobility problems, but also cause more frequent handovers. This causes an increase in the signaling overhead of the core network.

The dual connectivity (Dual Connectivity) technology is a method that can solve the above-mentioned unbalanced uplink and downlink problems and mobility problems. The so-called dual connectivity means that a certain UE is provided with radio resources by at least two base stations, and the two base stations are connected to each other via a non-ideal backhaul (Non-ideal backhaul). As mentioned above, the main reason for the unbalanced uplink and downlink problems is that the transmit power of the two base stations is different, resulting in that the best uplink service and downlink service in the unbalanced area are not the same base station. Dual connectivity can solve the problem of uplink and downlink imbalance by implementing uplink and downlink split (UL/DL split), that is, the uplink is served by the small cell, and the downlink is provided by the macro base station, thereby solving the problem of uplink and downlink imbalance; for mobility problems , dual connectivity can realize RRC signaling diversity (RRC diversity), that is, the macro base station and the small cell send handover signaling to the UE at the same time, thereby improving the accuracy of signaling reception; During the connection, through the separation of the user layer and the control layer, that is, the macro base station is responsible for processing control information, and the small cell is responsible for processing data information, thereby reducing the signaling overhead of the core network.

However, based on the existing technical specifications of dual connectivity, when a UE using dual connectivity moves within multiple small cells, it will still frequently trigger inter-cell handovers, and excessive handovers will still cause excessive traffic in the core network. The problem of signaling overhead still exists, and at the same time, due to the triggering of too many handover events, it will also cause problems such as ping-pong handover and call drop that affect the communication quality of users.

Contents of the invention

In order to solve the above technical problems, the present invention provides a handover method and device, which can reduce the number of times UE triggers handover events, reduce the signaling overhead of the core network, and improve the communication quality of users at the same time.

In order to achieve the purpose of the present invention, the present invention provides a handover method, the method comprising:

Receive measurement information reported by the user equipment UE, where the measurement information includes reference signal received quality RSRQ and reference signal received power RSRP of X cells; the X cells include Y in the source cell group where the UE is located cells and Z cells that do not belong to the source cell group;

judging whether a cell group needs to be switched for the UE according to the measurement information and preset switching conditions;

When it is determined that a cell group needs to be switched for the UE, a target cell group is determined for the UE, and the UE is switched from the source cell group to the target cell group.

Further, the preset handover condition includes: RSRQ _neighbour >RSRQ _s-max +Δ; wherein, RSRQ _neighbour represents the RSRQ received by the UE from any cell other than the source cell group, and RSRQ _s-max represents The maximum value of the RSRQ of the Y cells in the source cell group received by the UE, Δ is a handover offset;

Correspondingly, the judging whether a cell group needs to be switched for the user equipment according to the cell measurement information and preset switching conditions includes:

When the RSRQ of any cell in the Z cells received by the UE is greater than the sum of the maximum value of the RSRQ of the Y cells in the source cell group received by the UE and Δ, it is determined that the The UE switches cell groups;

When the RSRQ of any cell in the Z cells received by the UE is less than or equal to the sum of the maximum value of the RSRQ of the Y cells in the source cell group received by the UE and Δ, it is determined that no switching cell groups for the UE.

Further, the determining the target cell group for the UE includes:

Obtaining motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

Configuring an upper limit N _maxL of the number of cells included in the cell group for the UE according to the speed of the UE, where L represents a different speed level;

Determine the target cell group for the user equipment according to the position of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm, where the number of cells in the target cell group M≤Z And _{M≤N maxL} .

Further, before the method, the method also includes:

Determining the source cell group for the UE specifically includes:

Obtaining motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

Configuring an upper limit N _maxL of the number of cells included in the cell group for the UE according to the speed of the UE, where L represents a different speed level;

Determine the source cell group for the UE according to the location of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm, where Y≤N _maxL .

Further, the method also includes:

After the UE is handed over to the target cell group, select the cell corresponding to the maximum RSRQ to serve the UE according to the RSRQs of the M cells in the target cell group measured by the UE.

Further, the method also includes:

When it is determined that it is not necessary to switch the cell group for the UE, judge whether it is necessary to switch the serving cell in the source cell group for the UE according to the RSRQ of Y cells in the source cell group;

When the RSRQ of the cell serving the UE in the source cell group is not the maximum value among the RSRQs of the Y cells, select the cell corresponding to the maximum value among the RSRQs of the Y cells to serve the UE.

The present invention also provides a switching device, comprising:

The receiving unit is configured to receive measurement information reported by the user equipment UE, wherein the measurement information includes reference signal received quality RSRQ and reference signal received power RSRP of X cells; the X cells include the source where the UE is located Y cells in the cell group and Z cells not belonging to the source cell group;

A first judging unit, configured to judge whether a cell group needs to be switched for the UE according to the measurement information and preset switching conditions;

A processing unit, configured to determine a target cell group for the UE when it is determined that the cell group needs to be switched for the UE, and switch the UE from the source cell group to the target cell group.

Further, the preset handover condition includes: RSRQ _neighbour >RSRQ _s-max +Δ; wherein, RSRQ _neighbour represents the RSRQ received by the UE from any cell other than the source cell group, and RSRQ _s-max represents The maximum value of the RSRQ of the Y cells in the source cell group received by the UE, Δ is a handover offset;

Correspondingly, the first judging unit is specifically used for:

When the RSRQ of any cell in the Z cells received by the UE is greater than the sum of the maximum value of the RSRQ of the Y cells in the source cell group received by the UE and Δ, it is determined that the The UE switches cell groups;

When the RSRQ of any cell in the Z cells received by the UE is less than or equal to the sum of the maximum value of the RSRQ of the Y cells in the source cell group received by the UE and Δ, it is determined that no switching cell groups for the UE.

Further, the processing unit is specifically used for:

Obtaining motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

Configuring an upper limit N _maxL of the number of cells included in the cell group for the UE according to the speed of the UE, where L represents a different speed level;

Determine the target cell group for the user equipment according to the position of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm, where the number of cells in the target cell group M≤Z And _{M≤N maxL} .

Further, the processing unit is further configured to determine the source cell group for the UE, specifically for:

Obtaining motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

Configuring an upper limit N _maxL of the number of cells included in the cell group for the UE according to the speed of the UE, where L represents a different speed level;

Determine the source cell group for the UE according to the location of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm, where Y≤N _maxL .

Further, the processing unit is also used for:

After the UE is handed over to the target cell group, select the cell corresponding to the maximum RSRQ to serve the UE according to the RSRQs of the M cells in the target cell group measured by the UE.

Further, the device also includes:

A second judging unit, configured to judge whether it is necessary to switch a serving cell in the source cell group for the UE according to the RSRQs of Y cells in the source cell group when it is determined that it is not necessary to switch the cell group for the UE;

The switching unit, when the RSRQ of the cell serving the UE in the source cell group is not the maximum value of the RSRQ of the Y cells, select the cell corresponding to the maximum value of the RSRQ of the Y cells as the UE services.

A handover method and device provided by an embodiment of the present invention receive measurement information reported by a UE, wherein the measurement information includes reference signal received quality RSRQ and reference signal received power RSRP of X cells; the X cells include Y cells in the source cell group where the UE is located and Z cells that do not belong to the source cell group; judge whether it is necessary to switch cell groups for the UE according to the measurement information and preset switching conditions; when it is determined that it is necessary When switching a cell group for the UE, determine a target cell group for the UE, and switch the UE from the source cell group to the target cell group. Through the above technical solution, the number of times the UE triggers handover events can be reduced, the signaling overhead of the core network can be reduced, and the communication quality of the user can be improved at the same time.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the description, and are used together with the embodiments of the application to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

FIG. 1 is a schematic diagram of a scene architecture of the present invention;

FIG. 2 is a schematic flowchart of a handover method provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of selecting the size of a cell group for a UE based on the speed of the UE in an embodiment of the present invention;

FIG. 4 is a schematic diagram of an implementation of determining a cell group in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a switching device provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of Embodiment 1 provided by the embodiment of the present invention;

FIG. 7 is a schematic diagram of a scene of switching cell groups in Embodiment 2 provided by an embodiment of the present invention;

FIG. 8 is a schematic flowchart of Embodiment 2 provided by the embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

The steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

The cell in the technical solution of the present invention refers to a small cell (Small Cell) in the following embodiments, however, the cell in the technical solution of the present invention may not be limited to a small cell.

Accompanying drawing 1 is a schematic diagram of the scene architecture of the present invention. The technical solution of the present invention is aimed at dual-connection users. In a dual-connection scenario, a UE is simultaneously connected to a macro base station and at least one small base station (that is, a small cell, unless otherwise specified below, a small base station is equivalent to a small cell), where the macro base station The base station is responsible for the transmission of the control layer and the data layer with the UE, and the small base station is only responsible for the data layer transmission with the UE. Wherein, C-Plane refers to a control plane, and U-Plane refers to a user plane.

An embodiment of the present invention provides a handover method based on the macro base station side, as shown in FIG. 2 , the method includes:

Step 101: Receive the measurement information reported by the UE, wherein the measurement information includes RSRQ and RSRP of X cells; the X cells include Y cells in the source cell group where the UE is located and cells that do not belong to the Z cells of the source cell group.

Wherein, RSRQ is an abbreviation of (Reference Signal Receiving Quality), indicating the reference signal receiving quality, and RSRP is an abbreviation of (Reference Signal Receiving Power), indicating the reference signal receiving power.

Step 102 , judging whether a cell group needs to be handed over for the UE according to the measurement information and preset handover conditions.

Further, the preset handover condition includes: RSRQ _neighbour >RSRQ _s-max +Δ; wherein, RSRQ _neighbour represents the RSRQ received by the UE from any cell other than the source cell group, and RSRQ _s-max represents The maximum value of the RSRQ of the Y cells in the source cell group received by the UE, Δ is a handover offset;

Furthermore, step 102 may specifically include:

When the RSRQ of any cell in the Z cells received by the UE is greater than the sum of the maximum value of the RSRQ of the Y cells in the source cell group received by the UE and Δ, it is determined that the The UE switches cell groups;

When the RSRQ of any cell in the Z cells received by the UE is less than or equal to the sum of the maximum value of the RSRQ of the Y cells in the source cell group received by the UE and Δ, it is determined that no switching cell groups for the UE.

Step 103: When it is determined that the cell group needs to be switched for the UE, determine a target cell group for the UE, and switch the UE from the source cell group to the target cell group.

Further, in step 103: determining a target cell group for the UE may specifically include:

Obtaining motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

Configuring an upper limit N _maxL of the number of cells included in the cell group for the UE according to the speed of the UE, where L represents a different speed level;

Determine the target cell group for the user equipment according to the position of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm, where the number of cells in the target cell group M≤Z And _{M≤N maxL} .

Specifically, as shown in FIG. 3 , it is a schematic diagram of selecting the size of the cell group for the UE based on the speed of the UE. For UEs with different speeds, the corresponding upper limit of the number of cells in the cell group is also different.

details as follows:

case1: low speed; users who move at a low speed will trigger fewer switching times per unit time, and the set upper limit is N _max1 .

case2: medium speed; a user moving at a medium speed may pass through coverage areas of multiple cells within a unit time, and an upper limit N _max2 is set.

case3: high speed; users moving at high speed will pass through the coverage of a large number of cells in a unit time, and the upper limit value is set to N _max3 .

The relationship of the above three values is N _max1 <N _max2 <N _max3 .

When the UE is at a low speed, set the upper limit of the number of cells in its cell group to the minimum value N _max1 , for example, there is only N _max1 = 1 cell in the cell group at this time, this setting can reduce the selection range of the cell group, because the low speed The potential handover of the UE is less. When the UE is at a medium speed, the upper limit of the number of cells in its cell group increases accordingly, and the upper limit of the number of cells in its cell group is set to N _max2 , for example, there are N _max2 = 2 cells in the cell group at this time, which is relatively low-speed UE Generally speaking, medium-speed UEs generate more handovers per unit time. In order to avoid excessive inter-group handovers per unit time, a relatively large cell range is selected to accommodate more cells. When the UE is at high speed, the UE may pass through the coverage of many cells in a unit time, so the upper limit of cell group selection should be further expanded, and the upper limit of the number of cells in the cell group should be set to N _max3 , as shown in Figure 3. For example, at this time It includes N _max3 =4 cells.

Figure 4 is an implementation example of cell group selection, which selects a cell group for _a UE that will enter the small cell S1. It can be seen from Figure 4 that there are multiple small cells near the small cell S ₁ that the user will access. Direction and position and N _maxL to determine the target cell group.

Specifically, the target cell group (Small Cell Group, SCG) can be determined according to the following formula:

The constraints of the above formula are: |SCG|<N _maxL ; ∠S _i UV<θ _L ;

It should be noted that argmax(f(x)) is the variable x corresponding to the maximum value of f(x). For the above formula, that is, each cell contained in the target cell group can make Take the maximum value.

Wherein, S _i represents a small cell, L represents different speed levels, and L=1, 2, 3, corresponding to low-speed, medium-speed, and high-speed scenarios respectively. θ represents the maximum angle between the small cell and the direction of movement of the UE. UEs with different speeds choose different maximum angle limits due to the variable probability of the direction of movement. Since the high-speed UE moves between cell groups, the probability of changing the direction of motion in a short period of time is small, and the probability of changing the direction of movement of low-speed UEs between cell groups is relatively large in a short period of time, so here we set θ ₃ < θ ₂ <θ ₁ . ∠S _i UV represents the angle between each cell and the moving direction of the UE. Represents the signal strength of the cell S _i received by the UE, and different received signal strength thresholds th _L can be formulated according to different speed requirements of users.

As shown in Figure 4, there are five cells, S ₁ -S ₅ , near the UE. Assuming that the maximum number of cell groups is N _maxL =3, UV represents the moving direction of the UE, and the macro base station can obtain the moving parameters of the UE through GPS or other positioning technologies. ∠AUV and ∠BUV respectively represent the maximum value of the angle θ between the cell and the moving direction of the UE. Within this angle range, the optional cells are S ₁ , S ₂ , S ₃ , and S ₅ . According to the RSRP receiving strength, there are 3 cells in the optional cell group, namely S ₁ , S ₂ , and S ₃ . The maximum number of groups is limited, so the members of the target cell group are S ₁ , S ₂ , and S ₃ .

Further, before step 101, the method also includes:

Step 100. Determine the source cell group for the UE; specifically, it may include:

Obtaining motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

Configuring an upper limit N _maxL of the number of cells included in the cell group for the UE according to the speed of the UE, where L represents a different speed level;

Determine the source cell group for the UE according to the location of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm, where Y≤N _maxL .

It should be noted that, for the specific implementation process of step 100, refer to the specific description in step 103, which will not be repeated here.

Further, after step 103, the method may also include:

Step 104: After the UE is handed over to the target cell group, select the cell corresponding to the maximum RSRQ to serve the UE according to the RSRQs of the M cells in the target cell group measured by the UE.

Further, the method may also include:

Step 105, when it is determined that it is not necessary to switch the cell group for the UE, judge whether it is necessary to switch the serving cell for the UE in the source cell group according to the RSRQ of Y cells in the source cell group;

Step 106: When the RSRQ of the cell serving the UE in the source cell group is not the maximum value among the RSRQs of Y cells, select the cell corresponding to the maximum value among the RSRQs of the Y cells as the UE services.

It should be noted that, in the technical solution provided by the embodiment of the present invention, when the UE moves within the coverage of a cell group composed of multiple small cells, the selection of the serving cell within the cell group is reported by the macro base station through the UE. The measurement information selected does not trigger a handover event, and the handover is performed in units of cell groups; and when the UE moves to the edge of the cell group, the handover event is triggered and handed over to another cell group.

A handover method provided by an embodiment of the present invention receives measurement information reported by a UE, wherein the measurement information includes reference signal received quality RSRQ and reference signal received power RSRP of X cells; the X cells include the Y cells in the source cell group where the UE is located and Z cells that do not belong to the source cell group; judge whether it is necessary to switch the cell group for the UE according to the measurement information and preset switching conditions; When the UE switches cell groups, determine a target cell group for the UE, and switch the UE from the source cell group to the target cell group. Through the above technical solution, the number of times the UE triggers handover events can be reduced, the signaling overhead of the core network can be reduced, and the communication quality of the user can be improved at the same time.

An embodiment of the present invention provides a switching device 10, which can be set in a macro base station. As shown in FIG. 5, the switching device 10 includes:

The receiving unit 11 is configured to receive measurement information reported by the UE, wherein the measurement information includes reference signal received quality RSRQ and reference signal received power RSRP of X cells; the X cells include the source cell where the UE is located Y cells in the group and Z cells not belonging to the source cell group;

The first judging unit 12 is configured to judge whether a cell group needs to be switched for the UE according to the measurement information and preset switching conditions;

The processing unit 13 is configured to determine a target cell group for the UE when it is determined that the cell group needs to be switched for the UE, and switch the UE from the source cell group to the target cell group.

Further, the preset handover condition includes: RSRQ _neighbour >RSRQ _s-max +Δ; wherein, RSRQ _neighbour represents the RSRQ received by the UE from any cell other than the source cell group, and RSRQ _s-max represents The maximum value of the RSRQ of the Y cells in the source cell group received by the UE, Δ is a handover offset;

Correspondingly, the first judging unit 12 is specifically configured to:

When the RSRQ of any cell in the Z cells received by the UE is greater than the sum of the maximum value of the RSRQ of the Y cells in the source cell group received by the UE and Δ, it is determined that the The UE switches cell groups;

When the RSRQ of any cell in the Z cells received by the UE is less than or equal to the sum of the maximum value of the RSRQ of the Y cells in the source cell group received by the UE and Δ, it is determined that no switching cell groups for the UE.

Further, the processing unit 13 is specifically used for:

Obtaining motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

Configuring an upper limit N _maxL of the number of cells included in the cell group for the UE according to the speed of the UE, where L represents a different speed level;

Determine the target cell group for the user equipment according to the position of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm, where the number of cells in the target cell group M≤Z And _{M≤N maxL} .

Further, the processing unit 13 is further configured to determine the source cell group for the UE, specifically for:

Obtaining motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

Configuring an upper limit N _maxL of the number of cells included in the cell group for the UE according to the speed of the UE, where L represents a different speed level;

Determine the source cell group for the UE according to the location of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm, where Y≤N _maxL .

Further, the processing unit 13 is also used for:

After the UE is handed over to the target cell group, select the cell corresponding to the maximum RSRQ to serve the UE according to the RSRQs of the M cells in the target cell group measured by the UE.

Further, as shown in FIG. 5, the device 10 may also include:

The second judging unit 14 is configured to judge whether it is necessary to switch a serving cell in the source cell group for the UE according to the RSRQs of Y cells in the source cell group when it is determined that it is not necessary to switch the cell group for the UE ;

The switching unit 15, when the RSRQ of the cell serving the UE in the source cell group is not the maximum value of the RSRQ of the Y cells, select the cell corresponding to the maximum value of the RSRQ of the Y cells as the UE services described above.

It should be noted that the device embodiments described above are only illustrative, for example, the receiving unit 11, the first judging unit 12, the processing unit 13, the second judging unit 14, and the switching unit 15 in the above device embodiments The division of units is only a logical function division, and there may be another division method in actual implementation. In another point, the modules shown or discussed may be connected to each other through some interfaces, which may be in electrical, mechanical or other forms. The units may or may not be physically separated, and may or may not be physical units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional module in each embodiment of the present invention can be integrated in a processing module, for example, the first judging unit 12, the processing unit 13, the second judging unit 14, and the switching unit 15 can be integrated in a processing module, also Each module can be physically included separately, or two or more modules can be integrated into one module, for example, the receiving unit 11 can be integrated in the transceiver module of the base station, the first judging unit 12, the processing unit 13, the second judging unit 14 and the switching unit 15 can be integrated in the processing module of the base station. The above-mentioned integrated modules can be implemented in the form of hardware, or in the form of hardware plus software function modules. For example, the receiving unit 11 is realized by a transceiver of the base station, and the first judging unit 12, the processing unit 13, the second judging unit 14 and the switching unit 15 are realized by a processor of the base station and instructions executable by the processor, and the processor can The executed instructions may be stored on a computer readable storage medium. The above instructions are stored in a storage medium, including several instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to execute some steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other various media that can store program codes. .

This embodiment is used to implement the above-mentioned method embodiments. For the workflow and working principle of each unit in this embodiment, refer to the descriptions in the above-mentioned method embodiments, and details are not repeated here.

A handover device provided by an embodiment of the present invention receives measurement information reported by a UE, wherein the measurement information includes reference signal received quality RSRQ and reference signal received power RSRP of X cells; the X cells include the Y cells in the source cell group where the UE is located and Z cells that do not belong to the source cell group; judge whether it is necessary to switch the cell group for the UE according to the measurement information and preset switching conditions; When the UE switches cell groups, determine a target cell group for the UE, and switch the UE from the source cell group to the target cell group. Through the above technical solution, the number of times the UE triggers handover events can be reduced, the signaling overhead of the core network can be reduced, and the communication quality of the user can be improved at the same time.

In order to enable those skilled in the art to understand the technical solution provided by the present invention more clearly, the technical solution provided by the present invention will be described in detail below through specific examples:

Embodiment one

Figure 6 is a schematic diagram of the overall process of Embodiment 1, including the following steps:

Step S401: the process starts;

Step S402: UE measures surrounding cells to obtain measurement information, the measurement information includes RSRQ and RSRP of surrounding cells, and reports the measurement information to the macro base station;

Step S403: The macro base station judges whether to perform cell group handover according to the RSRQ of the surrounding cells reported by the UE, and the handover conditions are:

RSRQ _neighbor >RSRQ _s-max +Δ

If switching is required, proceed to step S404, and if switching is not required, proceed to step S406;

Step S404: When cell group handover is required, the macro base station selects a target cell group for the UE according to the acquired motion parameters of the UE and the RSRP of the surrounding cells reported by the UE, and notifies the target cell group and the source cell group to reallocate resources ;

Step S405: the macro base station selects the cell with the highest RSRQ in the selected target cell group to serve the UE;

Step S406: Under the condition that handover is not required, determine whether the serving cell in the source cell group needs to be changed, if necessary, go to step S407, and if not, go to step S402;

Step S407: When it is necessary to change the serving cell in the source cell group, the macro base station selects the cell with the highest RSRQ in the source cell group and notifies the cell to complete the data transmission.

Embodiment two

In this embodiment, the technical solution provided by the present invention is described by taking UE needing to switch cell groups as an example. FIG. 7 is a schematic diagram of a scene of switching cell groups in this embodiment, where the moving direction of UE is shown by the arrow. First, the UE selects cells 1, 2, and 3 as source cell groups. When the UE moves to the edge of cell 3, the handover condition is triggered, and the macro base station selects cells 3, 4, and 5 as the target cell group according to the measurement information reported by the UE and the acquired motion parameters of the UE.

Accompanying drawing 8 is the overall schematic flow chart of embodiment two, comprises the following steps:

Step S601: UE measures surrounding cells to obtain measurement information, which includes RSRQ and RSRP of surrounding cells;

It should be noted that the surrounding cells measured by the UE may specifically be each cell in the source cell group where the UE is located and several cells outside the source cell group.

Step S602: Report the measurement information obtained in the previous step to the macro base station;

Step S603: The macro base station makes a handover decision. If handover is required, it selects a target cell group for the UE according to the acquired motion parameters of the UE and the RSRP of the surrounding cells reported by the UE;

Exemplarily, the macro base station performs a handover decision according to the measurement information of the surrounding cells reported by the UE and preset handover conditions to determine whether it is necessary to hand over the cell group for the UE;

The preset handover conditions include: RSRQ _neighbour >RSRQ _s-max +Δ; wherein, RSRQ _neighbour represents any cell (such as It may be the RSRQ of the cell 4 or 5), RSRQ _s-max represents the maximum value of the RSRQ received by the UE in the source cell group, and Δ is the handover offset;

Assume that when the RSRQ of cell 4 received by the UE is greater than the sum of the maximum value of the RSRQ of the three cells in the source cell group received by the UE (assuming it is the RSRQ of cell 3) and Δ, the Acer The station determines that a cell group needs to be switched for the UE;

Further, the macro base station acquires motion parameters of the UE, where the motion parameters include: the position of the UE, the speed of the UE, and the speed direction of the UE;

According to the speed of the UE, the upper limit N _maxL of the number of cells included in the cell group is configured for the UE. For example, N _maxL is configured as 3, and L represents different speed levels;

determining the target cell group for the user equipment according to the position of the UE, the speed direction of the UE, the measurement information, N _maxL and a preset algorithm.

Specifically, in this embodiment, the macro base station selects the cells 3, 4, and 5 as the target cell group for the UE may refer to the relevant cell group selection example described in the method embodiment corresponding to Fig. 4 method.

Step S604: the macro base station sends a connection request to the target cell group and allocates resources;

Step S605: the macro base station sends a release request to the source cell group;

Step S606: the target cell group responds;

Step S607: the source cell group responds;

Step S608: the macro base station sends a radio resource control reconfiguration (RRC reconfiguration) request to the UE;

Step S609: UE responds;

Step S610: the reconfiguration is completed;

Step S611: UE synchronizes with the target cell group;

Step S612: UE measures the RSRQ of each cell in the target cell group;

Step S613: Report the measurement result to the macro base station;

Step S614: the macro base station selects the cell with the best RSRQ, and this cell will provide data services to the UE;

Step S615: data forwarding;

Step S616: data transmission.

Although the embodiments disclosed in the present invention are as above, the described content is only an embodiment adopted for understanding the present invention, and is not intended to limit the present invention. Anyone skilled in the field of the present invention can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention must still be The scope defined by the appended claims shall prevail.

Claims (12)

1. a kind of changing method, it is characterised in that include：

The metrical information that receive user equipment UE is reported, wherein, the metrical information includes X cell Reference Signal Received Quality RSRQ and Reference Signal Received Power RSRP；In the X cell It is individual including Y cell in the cell-of-origin group at UE places and the Z for being not belonging to the cell-of-origin group Cell；

Judge whether to need for the UE switching cells according to the metrical information and default switching condition Group；

When it is determined that need for the UE switching cells group when, be that the UE determines Target cell group, and will The UE is switched to the Target cell group from the cell-of-origin group.

2. method according to claim 1, it is characterised in that

The default switching condition includes：RSRQ_neighbour>RSRQ_s-max+Δ；Wherein, RSRQ_neighbour Represent the RSRQ, RSRQ of any one cell beyond the cell-of-origin group that the UE is received_s-max Represent the maximum of the RSRQ of Y cell in the cell-of-origin group that the UE is received, Δ is to cut Change amount of bias；

Accordingly, it is described to judge whether that needs are according to the cell measurement information and default switching condition User equipment switching cell group includes：

When the RSRQ of arbitrary cell in the Z cell that the UE is received is received more than the UE In the cell-of-origin group for arriving the maximum of the RSRQ of Y cell and Δ and when, it is determined that needing for institute State UE switching cells group；

When the RSRQ of arbitrary cell in the Z cell that the UE is received is less than or equal to described In the cell-of-origin group that UE is received the maximum of the RSRQ of Y cell and Δ and when, it is determined that It need not be UE switching cells group.

3. method according to claim 1, it is characterised in that described to determine target for the UE Little district's groups, including：

The kinematic parameter of the UE is obtained, the kinematic parameter includes：It is the position of the UE, described The velocity attitude of the speed of UE and the UE；

It is the transformation that the UE configures the cell that little district's groups are included according to the speed of the UE N_maxL, L represents friction speed grade；

Position, the velocity attitude of the UE according to the UE, the metrical information, N_maxLAnd Preset algorithm determines the Target cell group for the user equipment, wherein, the Target cell group is medium and small Area's quantity M≤Z and M≤N_maxL。

4. method according to claim 1, it is characterised in that before methods described, the side Method also includes：

The cell-of-origin group is determined for the UE, specifically include：

The kinematic parameter of the UE is obtained, the kinematic parameter includes：It is the position of the UE, described The velocity attitude of the speed of UE and the UE；

It is the transformation that the UE configures the cell that little district's groups are included according to the speed of the UE N_maxL, L represents friction speed grade；

Position, the velocity attitude of the UE according to the UE, the metrical information, N_maxLAnd Preset algorithm determines the cell-of-origin group for the UE, wherein, Y≤N_maxL。

5. method according to claim 3, it is characterised in that methods described also includes：

It is after the UE to be switched to the Target cell group, little according to the target of UE measurements In district's groups the RSRQ of M cell and select the corresponding cells of maximum RSRQ for the UE service.

6. method according to claim 1, it is characterised in that methods described also includes：

When it is determined that need not be the UE switching cells group, according to Y cell in the cell-of-origin group RSRQ judge whether to need to switch Serving cell for the UE in the cell-of-origin group；

When the RSRQ in the cell-of-origin group for the cell of UE services is not Y cell During maximum in RSRQ, the corresponding cell of maximum in the RSRQ of the Y cell is selected to be The UE services.

7. a kind of switching device, it is characterised in that include：

Receiving unit, for the metrical information that receive user equipment UE is reported, wherein, the metrical information Including the Reference Signal Received Quality RSRQ and Reference Signal Received Power RSRP of X cell；Institute State Y cell and be not belonging to the source that X cell include in the cell-of-origin group that the UE is located Z cell of little district's groups；

First judging unit, for judging whether needs according to the metrical information and default switching condition For UE switching cells group；

Processing unit, for when it is determined that need for the UE switching cells group when, be that the UE determines mesh Little district's groups are marked, and the UE is switched to into the Target cell group from the cell-of-origin group.

8. device according to claim 7, it is characterised in that

The default switching condition includes：RSRQ_neighbour>RSRQ_s-max+Δ；Wherein, RSRQ_neighbour Represent the RSRQ, RSRQ of any one cell beyond the cell-of-origin group that the UE is received_s-max Represent the maximum of the RSRQ of Y cell in the cell-of-origin group that the UE is received, Δ is to cut Change amount of bias；

Accordingly, first judging unit specifically for：

When the RSRQ of arbitrary cell in the Z cell that the UE is received is received more than the UE In the cell-of-origin group for arriving the maximum of the RSRQ of Y cell and Δ and when, it is determined that needing for institute State UE switching cells group；

When the RSRQ of arbitrary cell in the Z cell that the UE is received is less than or equal to described In the cell-of-origin group that UE is received the maximum of the RSRQ of Y cell and Δ and when, it is determined that It need not be UE switching cells group.

9. device according to claim 7, it is characterised in that the processing unit specifically for：

The kinematic parameter of the UE is obtained, the kinematic parameter includes：It is the position of the UE, described The velocity attitude of the speed of UE and the UE；

It is the transformation that the UE configures the cell that little district's groups are included according to the speed of the UE N_maxL, L represents friction speed grade；

Position, the velocity attitude of the UE according to the UE, the metrical information, N_maxLAnd Preset algorithm determines the Target cell group for the user equipment, wherein, the Target cell group is medium and small Area's quantity M≤Z and M≤N_maxL。

10. device according to claim 7, it is characterised in that the processing unit be additionally operable to for The UE determines the cell-of-origin group, specifically for：

The kinematic parameter of the UE is obtained, the kinematic parameter includes：It is the position of the UE, described The velocity attitude of the speed of UE and the UE；

It is the transformation that the UE configures the cell that little district's groups are included according to the speed of the UE N_maxL, L represents friction speed grade；

Position, the velocity attitude of the UE according to the UE, the metrical information, N_maxLAnd Preset algorithm determines the cell-of-origin group for the UE, wherein, Y≤N_maxL。

11. devices according to claim 9, it is characterised in that the processing unit is additionally operable to：

It is after the UE to be switched to the Target cell group, little according to the target of UE measurements In district's groups the RSRQ of M cell and select the corresponding cells of maximum RSRQ for the UE service.

12. devices according to claim 7, it is characterised in that described device also includes：

Second judging unit, for when it is determined that need not be the UE switching cells group, according to the source In little district's groups, the RSRQ of Y cell judges whether to need to switch in the cell-of-origin group for the UE Serving cell；

Switch unit, when the RSRQ in the cell-of-origin group for the cell of UE services is not Y During maximum in the RSRQ of individual cell, maximum in the RSRQ of the Y cell is selected correspondingly Cell be the UE service.