CN104918287A - Load balancing method and device - Google Patents

Abstract

The present invention discloses a load balancing method and device. The method includes: when the local cell is overloaded, obtaining a measurement report reported by a terminal; according to the measurement report, determining the edge terminal to be switched and its corresponding The target cell to be handed over, according to the load information of the cell and the load information of the target cell to be handed over, determine the load balance factor of the edge terminal to be handed over, and according to the load balance factor, from the edge terminal to be handed over The edge terminal to be handed over and the target cell to be handed over are determined in the terminal, and the edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over is handed over to the edge terminal to be handed over For the corresponding target cell to be handed over, the mode of selecting the edge terminal for handover and the target cell through the determined load balance factor can avoid the overload problem of the handed over cell during load balancing.

Description

A method and device for load balancing

technical field

The present invention relates to the field of communication technology, in particular to a load balancing method and device.

Background technique

SON (Self-Organizing Networks, self-organizing network) is an important part of LTE (Long Term Evolution, long-term evolution), which can simplify network management, reduce network operation and maintenance costs and improve network operation efficiency. Mobile load balancing technology is one of the important use cases in SON. Since the distribution of mobile network traffic is uneven in time and space, the load among cells is uneven. The use of mobile load balancing technology can reduce the load of high-load cells, realize load balancing between cells, and maximize the utilization of network resources.

The mobile load balancing technology is mainly divided into two categories: one is to realize the load balancing of the cell by adaptively adjusting the handover parameters; the other is to select the adjacent cell with a lower load value as the target cell through the high-load cell, and switch some users to the target cell. To the target cell to achieve cell load balancing. The former implements load balancing through adaptive adjustment of handover parameters and user mobility, and responds slowly to load balancing caused by unexpected services. Although the latter can quickly realize load balancing, it will cause damage to mobile robustness, resulting in ping-pong handover, wireless connection failure, and user QoS (Quality of Service, Quality of Service) loss. The user handover problem in the load balancing process is mainly the selection of the target cell and the selection of handover users. Previous load balancing methods mainly focus on these two aspects to optimize the load balancing process.

Chinese patent CN 102905307 A "Realizing Neighborhood List and Load Balance Joint Optimization System" discloses a kind of optimization of load balancing through the neighbor list establishment module, but the load balancing process through the adjustment mode of switching parameters reduces the execution of load balancing efficiency. Chinese patent CN 102625369 A "Load Balance Optimization Method for Classification Guaranteeing Service Quality Requirements of Users of Different Levels" discloses a load balancing switch according to different user levels, giving priority to guaranteeing the bit rate requirements of high-level users and preferentially selecting the one that occupies the most system resources The method by which the user switches. This method does not take enough consideration of target cells, which may cause some target cells to be overloaded.

To sum up, there is an urgent need for a load balancing method, which is used to balance the cells with high loads, so as to avoid overloading the cells after handover.

Contents of the invention

Embodiments of the present invention provide a method and device for load balancing, so as to improve the efficiency of load balancing.

An embodiment of the present invention provides a load balancing method, the method comprising:

Obtain the measurement report reported by the terminal when the cell is overloaded;

According to the measurement report, determine the edge terminal to be handed over and its corresponding target cell to be handed over from the terminal;

Determine the load balance factor of the edge terminal to be handed over according to the load information of the cell and the load information of the target cell to be handed over, and the load balance factor is used to measure the handover of the edge terminal to be handed over to the target to be handed over After the cell, the load impact on the current cell and the target cell to be handed over;

The edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over is handed over to the target cell to be handed over corresponding to the edge terminal to be handed over.

Preferably, according to the measurement report, determining the edge terminal to be handed over and its corresponding target cell to be handed over from the terminal includes:

Obtain the reference signal received power of the cell and its neighboring cells reported by the terminal;

Determine the signal-to-interference-noise ratio of the local cell and its neighboring cells according to the reference signal received power of the local cell and its neighboring cells;

Determine the edge terminal to be handed over and its corresponding target cell to be handed over according to the following formula:

SINR _s -SINR _j ≤2HM ₀ -HM _sj

Among them, SINR _s is the signal-to-interference-noise ratio of the local cell, SINR _j is the signal-to-interference-noise ratio of the target cell, HM ₀ is the initial value of the handover offset between cells, and HM _sj is the distance from the edge terminal to be handed over to the target cell. The handover offset of the handover target cell.

Preferably, the load balancing factor of the edge terminal to be switched is determined according to the following formula:

$\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}$

Among them, α is the load balance factor of the edge terminal to be switched, N _i,j is the number of resource blocks RB required by the target cell j to be switched to meet the service rate of the i-th edge terminal to be switched, and N _j is the target cell to be switched j is the number of RBs that meet the service rate requirements of all terminals in the cell, N _i,s is the number of RBs required by the cell s to meet the service rate requirements of the i-th edge terminal to be handed over, and N _s is the number of RBs that the cell s needs to meet The number of RBs required by the service rate of all terminals in the cell, i>0, s>0, j>0.

Preferably, after the determination of the load balance factor of the edge terminal to be switched, the method further includes:

storing the edge terminal to be switched, the target cell to be switched and their corresponding load balance factors in the user list to be switched, and sorting all the load balance factors in the user list to be switched according to the size of the load balance factors Selecting the edge terminal to be handed over and the target cell to be handed over corresponding to the load balancing factor that has the greatest impact on the loads of the local cell and the target cell to be handed over.

Preferably, after switching the edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the current cell and the target cell to be handed over to the target cell to be handed over corresponding to the edge terminal to be handed over, further comprising: :

If the load value of the local cell is less than the overload threshold value, suspend load balancing within a set time, and suspend accepting load balancing of neighboring cells of the local cell.

Correspondingly, the embodiment of the present invention also provides a load balancing device, including:

An acquisition module, configured to acquire the measurement report reported by the terminal when the cell is overloaded;

A first determining module, configured to determine from the terminal the edge terminal to be handed over and its corresponding target cell to be handed over according to the measurement report;

The second determining module is configured to determine the load balance factor of the edge terminal to be switched according to the load information of the cell and the load information of the target cell to be switched, and the load balance factor is used to weigh the edge terminal to be switched The load impact on the local cell and the target cell to be switched after switching to the target cell to be switched;

The switching module is configured to switch the edge terminal to be switched corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be switched to the target cell to be switched corresponding to the edge terminal to be switched.

Preferably, the first determination module is specifically used for:

Obtain the reference signal received power of the cell and its neighboring cells reported by the terminal;

Determine the signal-to-interference-noise ratio of the local cell and its neighboring cells according to the reference signal received power of the local cell and its neighboring cells;

Determine the edge terminal to be handed over and its corresponding target cell to be handed over according to the following formula:

SINR _s -SINR _j ≤2HM ₀ -HM _sj

Among them, SINR _s is the signal-to-interference-noise ratio of the local cell, SINR _j is the signal-to-interference-noise ratio of the target cell, HM ₀ is the initial value of the handover offset between cells, and HM _sj is the distance from the edge terminal to be handed over to the target cell. The handover offset of the handover target cell.

Preferably, the second determination module is specifically used for:

Determine the load balancing factor of the edge terminal to be switched according to the following formula:

$\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}$

Among them, α is the load balance factor of the edge terminal to be switched, N _i,j is the number of resource blocks RB required by the target cell j to be switched to meet the service rate of the i-th edge terminal to be switched, and N _j is the target cell to be switched j is the number of RBs that meet the service rate requirements of all terminals in the cell, N _i,s is the number of RBs required by the cell s to meet the service rate requirements of the i-th edge terminal to be handed over, and N _s is the number of RBs that the cell s needs to meet The number of RBs required by the service rate of all terminals in the cell, i>0, s>0, j>0.

Preferably, the second determination module is also used for:

After the load balance factor of the edge terminal to be switched is determined, the edge terminal to be switched, the target cell to be switched and their corresponding load balance factors are stored in the user list to be switched, and according to the load balance factor of the load balance factor Sorting all the load balance factors in the user list to be switched by size, and selecting the edge terminal to be switched and the target cell to be switched corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be switched.

Preferably, the switching module is also used for:

After handing over the edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over to the target cell to be handed over corresponding to the edge terminal to be handed over, if the local cell If the load value is less than the overload threshold value, then within the set time, the load balancing is suspended, and the load balancing of the adjacent cells of the own cell is suspended.

In the above embodiment, firstly, when the local cell is overloaded, the measurement report reported by the terminal is obtained; according to the measurement report, the edge terminal to be handed over and its corresponding target cell to be handed over are determined from the terminal, and then according to the The load information of the cell and the load information of the target cell to be handed over determine the load balance factor of the edge terminal to be handed over, and determine the edge terminal to be handed over from the edge terminals to be handed over according to the load balance factor. For the target cell to be switched, finally switch the edge terminal to be switched corresponding to the maximum load balance factor to the target cell to be switched corresponding to the edge terminal to be switched, and select the edge terminal to be switched and the target cell to be switched by the determined load balance factor In this manner, the problem of overloading of the cell after switching can be avoided during load balancing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic flow diagram of a load balancing method in an embodiment of the present invention;

FIG. 2 is a schematic flowchart of another load balancing method in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a load balancing device in an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The network provided by the embodiment of the present invention is an LTE network, and the embodiment of the present invention is not limited to the LTE network, and is also applicable to other mobile networks, which is only used as an example here.

Figure 1 shows a flow of a load balancing method, which is executed by a load balancing device, which can be located in the base station, or can be a centralized control device independent of the base station, as shown in Figure 1, the process Specific steps include:

Step S101, when the local cell is overloaded, obtain the measurement report reported by the terminal.

Concretely, first carry out local load monitoring and calculation to this sub-district, and report the load status of this sub-district, when the load value of this sub-district is greater than an overload threshold value (in the embodiment of the present invention, it is the first overload threshold value _ξ1 , can be an overload threshold set based on experience, or an overload threshold divided according to the load level of the cell), that is, when the load of the cell is overloaded, it is necessary to perform load balancing on the cell to obtain the measurement reported by the terminal Report.

At the same time, in the above step S101, the current cell can interact with the load information of its neighbor cells through the X2 interface, and store the load information of the neighbor cells in the load information list of the neighbor cells.

Wherein, the load information of the cell can be: the load value of the cell; the PRB (Physical Resource blocks, physical resource blocks) utilization rate of the wireless resource status uplink/downlink GBR (Guaranteed Bit Rate, guaranteed bit rate) service; the available load value ( Uplink/downlink capacity that can be used for load balancing as a percentage of the total capacity); through event-based trigger load information reporting.

The obtained measurement report is mainly used to obtain information such as the RSRP (Reference Signal Received Power) value of the current cell and its neighboring cells reported by the terminal and the service rate of the current cell and its neighboring cells that can meet the terminal's use.

Step S102, according to the measurement report, determine the edge terminal to be handed over and its corresponding target cell to be handed over from the terminals.

In step S102, after obtaining the measurement report, first obtain the RSRP values of the current cell and its neighboring cells reported by the terminal in the measurement report, and then convert the RSRP values of the current cell and its neighboring cells into the cost cell and its The SINR (Signal to Interference plus Noise Ratio) value of the adjacent cell, wherein, SINR=RSRP/(interference power+noise power), can determine the SINR value of the cell and its adjacent cell, and then according to The following formula (1) determines the edge terminal to be handed over and its corresponding target cell to be handed over from the terminal:

SINR _s -SINR _j ≤2HM ₀ -HM _sj ……………………………………(1)

Among them, SINR _s is the signal-to-interference-noise ratio of the local cell, SINR _j is the signal-to-interference-noise ratio of the target cell, HM ₀ is the initial value of the handover offset between cells, and HM _sj is the distance from the edge terminal to be handed over to the target cell. The handover offset of the handover target cell handover, the handover offset can be set according to experience.

As long as it is a terminal and a cell that satisfy the above formula (1), it is an edge terminal to be handed over and its corresponding target cell to be handed over. There may be multiple edge terminals to be handed over and its corresponding target cell to be handed over, or one No, at this time, the load balancing of the local cell can only be terminated, and the load balancing of the local cell cannot be performed.

Step S103: Determine a load balance factor of the edge terminal to be handed over according to the load information of the current cell and the load information of the target cell to be handed over.

According to the load information of this cell and its adjacent cells in the step S101, that is, the load value of this cell and its adjacent cells, determine the load balance factor of the edge terminal to be handed over by the following formula (2):

$\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}\mathrm{<span\; class="notranslate">\; ...</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, α is the load balance factor of the edge terminal to be switched, N _i,j is the number of resource blocks RB required by the target cell j to be switched to meet the service rate of the i-th edge terminal to be switched, and N _j is the target cell to be switched j is the number of RBs that meet the service rate requirements of all terminals in the cell, N _i,s is the number of RBs required by the cell s to meet the service rate requirements of the i-th edge terminal to be handed over, and N _s is the number of RBs that the cell s needs to meet The number of RBs required by the service rate of all terminals in the cell, i>0, s>0, j>0.

The above load balance factor is used to measure the load impact of the edge terminal to be handed over to the target cell to be handed over to the local cell and the target cell to be handed over. The determination of the load balance factor takes into account the load of the current cell and the load information of the target cell to be handed over can avoid the load overload of the target cell after the edge terminal to be handed over is handed over to the target cell. When selecting the load balance factor, try to select a load balance factor with a large value. A larger value of the load balance factor means that the edge terminal to be handed over will occupy more resources in the cell. After the edge terminal that occupies more resources in the cell is switched, The greater the load value of the reduced local cell, and the greater the load balance factor value, the smaller the load value of the target cell to be switched corresponding to the edge terminal to be handed over, after switching the edge terminal to be switched to the target cell to be switched, no This causes an overload phenomenon in the target cell to be handed over. After the edge terminal occupying the most resources of the cell is switched, the purpose of reducing the load of the cell is achieved by switching only a few terminals, and the efficiency of load balancing is improved. The calculation method of the balance factor in the embodiment of the present invention is not limited to the above-mentioned formula (2), and other calculation methods may also be used. The embodiment of the present invention is only an example and does not limit it.

After the load balance factor of the edge terminal to be switched is determined, the edge terminal to be switched, the target cell to be switched and their corresponding load balance factors are stored in the user list to be switched, and according to the size of the load balance factor Sort all the load balance factors in the user list to be switched, and select the edge terminal to be switched and the target cell to be switched corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be switched. The load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over refers to the load balance factor with the largest load balance factor value, and the largest impact on the load of the local cell means that the edge terminal to be handed over occupies the most resources in the cell , after the edge terminal to be switched is switched, the load value of the cell is reduced more; the greatest impact on the target cell to be switched means that the load value of the target cell to be switched corresponding to the edge terminal to be switched is the smallest, and the edge terminal to be switched is switched to the target cell to be switched After the target cell is switched, the target cell to be switched will not be overloaded.

Step S104, switching the edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over to the target cell to be handed over corresponding to the edge terminal to be handed over.

Specifically, according to the load balance factor selected from the user list to be handed over, which represents the load that has the greatest impact on the load of the local cell and the target cell to be handed over, the load impact on the local cell and the target cell to be handed over will be affected. The edge terminal to be handed over corresponding to the largest load balance factor is handed over to the target cell to be handed over corresponding to the edge terminal to be handed over. A larger value of the load balance factor indicates that the edge terminal to be handed over occupies more resources of the local cell, that is, the larger the proportion of the load value of the local cell, and the smaller the load value of the target cell to be switched , it can achieve the purpose of reducing the load of the cell by switching only a few terminals, reducing signaling overhead, and at the same time, the load balancing factor can prevent the target cell from being overloaded after the terminal is switched.

In the above process, according to the load information of the current cell and the target cell, if the load values of the current cell and the target cell will not exceed the first overload threshold after the edge terminal to be handed over is switched, then the The terminal to be switched is switched.

It is also possible to select the edge terminal to be switched corresponding to the target cell to be switched with the smallest load value according to the load information of the current cell and the target cell, switch to the target cell corresponding to the edge terminal to be switched, and then determine whether the load value of the cell is still low. is greater than the first overload threshold, if so, continue to perform load balancing on the cell. At the same time, after performing load balancing on the local cell, the load information of the local cell and its neighboring cells is updated in real time.

After the step S104, if the load value of the local cell is less than the overload threshold value (in the embodiment of the present invention, it is the second overload threshold value ξ ₂ , it may be an overload threshold value set according to experience, or is an overload threshold divided according to the load degree of the cell), then within the set time, the load balancing is suspended, and the load balancing of the neighboring cells of the own cell is suspended. A load balancing end timer can be set. When the load value of the local cell is less than the second overload threshold, the load balancing end timer is started, the load balancing process is suspended, and the load balancing request of the neighboring cell is also suspended. After the load balancing end timer expires, the cell will allow the load balancing request of the neighboring cell again. The set time can be set according to experience.

The above embodiment shows that by obtaining the measurement report reported by the terminal; according to the measurement report, the edge terminal to be handed over and its corresponding target cell to be handed over are determined from the terminal, and then according to the load information of the current cell and the The load information of the target cell to be switched determines the load balance factor of the edge terminal to be switched. According to the load balance factor, the edge terminal to be switched and the target cell to be switched are determined from the edge terminals to be switched, and finally the maximum The edge terminal to be handed over corresponding to the load balance factor is handed over to the target cell to be handed over corresponding to the edge terminal to be handed over, so that the problem of overloading of the handed over cell can be avoided during load balancing. In the embodiment of the present invention, the user list to be handed over includes the edge terminal to be handed over and its corresponding target cell to be handed over, and the load balance factor, indicating the load balance degree of the edge terminal to be handed over in the target cell to be handed over, and can dynamically update the List of users to be switched. A more suitable edge terminal to be handed over and a more suitable target cell to be handed over can be selected according to the value of the load balance factor, so that a better load balancing effect can be obtained with fewer terminals to be handed over, and the execution efficiency of load balancing can be improved.

In order to better explain the present invention, FIG. 2 is an implementation process of a load balancing method in a mobile network in a specific application scenario according to an embodiment of the present invention.

In the embodiment of the present invention, the current cell is s, and there are three neighboring cells, which are j1, j2, and j3. The number N _s of RBs (Resource Blocks, resource blocks) required by the cell s in order to meet the service rate requirements of all current terminals is 108. The number of RBs required by neighboring cells j1, j2, and j3 to meet the service rate requirements of all terminals in the cell are N _j1 =30, N _j2 =91, and N _j3 =95, respectively. There are four edge terminals in the cell s, namely u1, u2, u3 and u4. It is assumed that the number of resource blocks occupied by u1, u2, u3 and u4 are N _u1,s =4, N _u2,s =5, N _u3,s =10, N _u4,s =10 respectively. And it is assumed that the total number of physical resource blocks N _total of the cells is 100, and all four cells have the same number of physical resource blocks.

Step S201, real-time monitoring of cell load status.

The monitoring process is mainly to measure and analyze the data, analyze the load status of the cell according to the measured data, and calculate the load value of the cell. The calculation of the load value adopts the calculation method of the virtual load value, and the calculation formula of the virtual load value is as follows:

$\mathrm{<span\; class="notranslate">\; \&rho;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; o</span>}\mathrm{<span\; class="notranslate">\; t</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; l</span>}}}\underset{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; no</span>}}{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}$

ρ is the load value of the cell, N _total is the total number of physical resource blocks available in the cell, N _k,j is the number of physical resource blocks that the kth terminal in the jth cell needs to occupy to meet its guaranteed service rate. According to the technical standard of TS36.213 in 3GPP (3rd Generation Partnership Project, 3rd Generation Partnership Project), N _k,j can be obtained according to the code modulation level of the terminal and the guaranteed service rate of the terminal by looking up a table. At this time, the load value of the cell is

Step S202, when judging whether the load value ρ of the cell is greater than _ξ1 , if yes, go to step S203, otherwise return to step S201.

ξ ₁ is an overload threshold set by the cell. ξ ₁ can be set according to the load level of the cell. If it is greater than 1, it means that the cell is overloaded. In the embodiment of the present invention, ξ ₁ is set to 1. At this time, the cell s is overloaded.

In step S203, the local cell s sends a load information exchange signaling to the adjacent cell through the X2 interface to obtain the load information of the adjacent cell. Store the load information of adjacent cells in the "Neighboring Cell Load Information List". The current cell s obtains the load information of the neighboring cells j1, j2, and j3.

The interaction of load information is divided into periodical and event-triggered load information interaction, and the above-mentioned information interaction is an event-triggered information interaction.

The load information of the cell can be: the load value of the cell; the PRB utilization rate of the radio resource status uplink/downlink GBR service; the available load value (the percentage of the uplink/downlink capacity that can be used for load balancing to the total capacity); Trigger load information reporting.

Step S204, obtaining the RSRP information reported by the UE, including the RSRP of the cell where the UE is located and the RSRP values of neighboring cells. The edge terminal is selected according to the RSRP value of the terminal, and at the same time, the target cell to which the edge terminal can switch is determined.

Determine the terminal satisfying the formula (1) as an edge terminal, and determine the target cell j at the same time. When a terminal corresponds to two cells or multiple cells satisfying formula (1) at the same time, the best target cell is selected according to the load balance factor.

SINR _s -SINR _j ≤2HM ₀ -HM _sj ……………………………………(1)

SINR _s is the signal-to-interference-noise ratio of the local cell s, in dB; SINR _j is the signal-to-interference-noise ratio of the target cell j, in dB; HM ₀ is the initial value of the handover offset between cells, in dB; HM _sj is the handover offset from the current serving cell to the target cell, and the unit is dB.

If u3 detects the signals of cells j2 and j3 at the same time, and satisfies the condition of formula (1) at the same time. At this time, the local cell s calculates its load balancing factors α _3,j2 and α _3,j3 with respect to j2 and j3 for the terminal u3 respectively. If α _3,j2 ≥α _3,j3 , then select j2 as the target cell, otherwise select j3 as the target cell.

Obtain the load information of adjacent cells from the "adjacent cell load information list", and calculate the load balance factor α of each edge terminal according to the load information of adjacent cells, the load status of this cell and the terminal channel status. It can be calculated using the following formula (2):

$\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}\mathrm{<span\; class="notranslate">\; ...</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

N _i,s represents the number of RBs required by the cell s to meet the service rate requirements of the i-th switching terminal; N _s represents the number of RBs required by the cell s to meet the service rate requirements of all current terminals; N _i,j represents The target cell j is the number of RBs required by the i-th handover terminal; N _j is the number of RBs required by the target cell j to meet the service rate requirements of all terminals in the cell at the current moment. Wherein N _i,s and N _i,j can be obtained by looking up a table according to the 3GPP standard. The calculation formulas of N _s and N _j in the above formula are as follows:

${\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}}{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}$

N _s and N _j represent the accumulation of resource blocks required by all terminals in the current cell and the target cell, respectively. M _s and M _j represent the total number of all terminals in the current cell and the target cell, respectively.

Terminals suitable for handover are predicted according to the value of α, and α < 0 is considered unsuitable for handover terminals. Predict the terminal to be switched according to the value of α, generate a list of users to be switched, and sort according to the size of α. In a terminal suitable for handover, the larger the value of α, the higher the priority.

If the number of resource blocks occupied by the terminal is the same after handover, _{ie Nu3,s} =N _u3,j2 , the load balance factor of terminal u3 corresponding to cell j2 Therefore, after the handover of the terminal u3, the load of the cell j2 will be higher than that of the own cell s, so the terminal u3 is determined to be unsuitable for handover. Assuming that the target cells corresponding to terminals u1, u2, and u4 are all j1, obviously 0<α _{1, j1} <α _{2, j1} <α _4,j1 , so terminal u4 has the highest priority, and terminal u4 is handed over first. 9.3% of the load can be diverted by switching terminal u4. If u1 is switched only 3.7% of the load is transferred. Switching both u1 and u2 at the same time only transfers 8.3% of the load. Therefore, the method of adopting the load balance factor improves the switching efficiency, achieves a better unloading effect for terminals with less switching, and reduces the signaling overhead caused by terminal switching.

Step S205, when the list of users to be switched is empty, it means that there is no terminal to be switched in the cell, the load balancing process ends, and go to step S208; otherwise, go to step S206.

In step S206, the terminal with the largest α value is selected to perform handover. That is, the cell s preferentially handovers the terminal u4.

Step S207, when the load value of the cell is lower _than a relatively low load threshold ξ2, then go to step S208, otherwise go to step S203 through step S209. Wherein, the ξ ₂ is divided according to the load degree of the cell, which is a relatively low load threshold value, 0.8 is optional; ξ ₂ <ξ ₁ can prevent frequent load balancing process.

Step S208, start a load balancing end timer T1, and the timing time is t ₁ . During the time _t1 , the local cell s suspends the load balancing process of the local cell and suspends accepting the load balancing switching request of the adjacent cell to prevent too frequent load balancing process and ping-pong switching. After the timer T1 expires, the local cell s will allow the load balancing request of its neighboring cells again.

In step S209, after the handover is completed, the load information of the current cell is updated, and the load information of the neighboring cells is also updated at the same time.

Based on the same inventive concept, FIG. 3 shows a load balancing device, which can execute the flow of the load balancing method. The device can be located in the base station, or it can be a centralized control device independent of the base station, as shown in FIG. 3 As shown, the device includes:

An acquisition module 301, configured to acquire a measurement report reported by a terminal when the cell is overloaded;

The first determination module 302 is configured to determine the edge terminal to be handed over and its corresponding target cell to be handed over from the terminal according to the measurement report;

The second determination module 303 is configured to determine the load balance factor of the edge terminal to be handed over according to the load information of the cell and the load information of the target cell to be handed over, and the load balance factor is used to measure the edge terminal to be handed over After the terminal switches to the target cell to be switched, the load impact on the current cell and the target cell to be switched;

The switching module 304 is configured to switch the edge terminal to be switched corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be switched to the target cell to be switched corresponding to the edge terminal to be switched.

Preferably, the first determination module 302 is specifically configured to:

Obtain the reference signal received power of the cell and its neighboring cells reported by the terminal;

Determine the signal-to-interference-noise ratio of the local cell and its neighboring cells according to the reference signal received power of the local cell and its neighboring cells;

Determine the edge terminal to be handed over and its corresponding target cell to be handed over according to the following formula:

SINR _s -SINR _j ≤2HM ₀ -HM _sj

Among them, SINR _s is the signal-to-interference-noise ratio of the local cell, SINR _j is the signal-to-interference-noise ratio of the target cell, HM ₀ is the initial value of the handover offset between cells, and HM _sj is the distance from the edge terminal to be handed over to the target cell. The handover offset of the handover target cell.

Preferably, the second determining module 303 is specifically configured to:

Determine the load balancing factor of the edge terminal to be switched according to the following formula:

$\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}$

Among them, α is the load balance factor of the edge terminal to be switched, N _i,j is the number of resource blocks RB required by the target cell j to be switched to meet the service rate of the i-th edge terminal to be switched, and N _j is the target cell to be switched j is the number of RBs that meet the service rate requirements of all terminals in the cell, N _i,s is the number of RBs required by the cell s to meet the service rate requirements of the i-th edge terminal to be handed over, and N _s is the number of RBs that the cell s needs to meet The number of RBs required by the service rate of all terminals in the cell, i>0, s>0, j>0.

Preferably, the second determination module 303 is also used for:

After the load balance factor of the edge terminal to be switched is determined, the edge terminal to be switched, the target cell to be switched and their corresponding load balance factors are stored in the user list to be switched, and according to the load balance factor of the load balance factor Sorting all the load balance factors in the user list to be switched by size, and selecting the edge terminal to be switched and the target cell to be switched corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be switched.

Preferably, the switching module 304 is also used for:

After handing over the edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over to the target cell to be handed over corresponding to the edge terminal to be handed over, if the local cell If the load value is less than the overload threshold value, then within the set time, the load balancing is suspended, and the load balancing of the adjacent cells of the own cell is suspended.

To sum up, by obtaining the measurement report reported by the terminal; according to the measurement report, determine the edge terminal to be handed over and its corresponding target cell to be handed over from the terminal, and then according to the load information of the cell and the The load information of the target cell to be switched determines the load balance factor of the edge terminal to be switched. According to the load balance factor, the edge terminal to be switched and the target cell to be switched are determined from the edge terminals to be switched, and finally the maximum The edge terminal to be handed over corresponding to the load balance factor is handed over to the target cell to be handed over corresponding to the edge terminal to be handed over, so that the problem of overloading of the handed over cell can be avoided during load balancing. In the embodiment of the present invention, the user list to be handed over includes the edge terminal to be handed over and its corresponding target cell to be handed over, and the load balance factor, indicating the load balance degree of the edge terminal to be handed over in the target cell to be handed over, and can dynamically update the List of users to be switched. A more suitable edge terminal to be handed over and a more suitable target cell to be handed over can be selected through the value of the load balance factor, so as to achieve fewer handover terminals and a better load balancing effect, and improve the execution efficiency of load balancing.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A method for load balancing, characterized in that the method comprises: Obtain the measurement report reported by the terminal when the cell is overloaded; According to the measurement report, determine the edge terminal to be handed over and its corresponding target cell to be handed over from the terminal; Determine the load balance factor of the edge terminal to be handed over according to the load information of the cell and the load information of the target cell to be handed over, and the load balance factor is used to measure the handover of the edge terminal to be handed over to the target to be handed over After the cell, the load impact on the current cell and the target cell to be handed over; The edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over is handed over to the target cell to be handed over corresponding to the edge terminal to be handed over. 2. The method according to claim 1, wherein, according to the measurement report, determining the edge terminal to be handed over and its corresponding target cell to be handed over from the terminal comprises: Obtain the reference signal received power of the cell and its neighboring cells reported by the terminal; Determine the signal-to-interference-noise ratio of the local cell and its neighboring cells according to the reference signal received power of the local cell and its neighboring cells; Determine the edge terminal to be handed over and its corresponding target cell to be handed over according to the following formula: SINR _s -SINR _j ≤2HM ₀ -HM _sj Among them, SINR _s is the signal-to-interference-noise ratio of the local cell, SINR _j is the signal-to-interference-noise ratio of the target cell, HM ₀ is the initial value of the handover offset between cells, and HM _sj is the distance from the edge terminal to be handed over to the target cell. The handover offset of the handover target cell. 3. The method according to claim 1, wherein the load balancing factor of the edge terminal to be switched is determined according to the following formula: $\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}$ Among them, α is the load balance factor of the edge terminal to be switched, N _i,j is the number of resource blocks RB required by the target cell j to be switched to meet the service rate of the i-th edge terminal to be switched, and N _j is the target cell to be switched j is the number of RBs that meet the service rate requirements of all terminals in the cell, N _i,s is the number of RBs required by the cell s to meet the service rate requirements of the i-th edge terminal to be handed over, and N _s is the number of RBs that the cell s needs to meet The number of RBs required by the service rate of all terminals in the cell, i>0, s>0, j>0. 4. The method according to any one of claims 1 to 3, wherein after said determining the load balancing factor of said edge terminal to be switched, further comprising: storing the edge terminal to be switched, the target cell to be switched and their corresponding load balance factors in the user list to be switched, and sorting all the load balance factors in the user list to be switched according to the size of the load balance factors Selecting the edge terminal to be handed over and the target cell to be handed over corresponding to the load balancing factor that has the greatest impact on the loads of the local cell and the target cell to be handed over. 5. The method according to claim 1, wherein, at the edge terminal to be handed over to the edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over After the target cell to be handed over corresponding to the edge terminal, it also includes: If the load value of the local cell is less than the overload threshold value, suspend load balancing within a set time, and suspend accepting load balancing of neighboring cells of the local cell. 6. A device for load balancing, comprising: An acquisition module, configured to acquire the measurement report reported by the terminal when the cell is overloaded; A first determining module, configured to determine from the terminal the edge terminal to be handed over and its corresponding target cell to be handed over according to the measurement report; The second determining module is configured to determine the load balance factor of the edge terminal to be switched according to the load information of the cell and the load information of the target cell to be switched, and the load balance factor is used to weigh the edge terminal to be switched The load impact on the local cell and the target cell to be switched after switching to the target cell to be switched; The switching module is configured to switch the edge terminal to be switched corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be switched to the target cell to be switched corresponding to the edge terminal to be switched. 7. The device according to claim 6, wherein the first determining module is specifically configured to: Obtain the reference signal received power of the cell and its neighboring cells reported by the terminal; Determine the signal-to-interference-noise ratio of the local cell and its neighboring cells according to the reference signal received power of the local cell and its neighboring cells; Determine the edge terminal to be handed over and its corresponding target cell to be handed over according to the following formula: SINR _s -SINR _j ≤2HM ₀ -HM _sj Among them, SINR _s is the signal-to-interference-noise ratio of the local cell, SINR _j is the signal-to-interference-noise ratio of the target cell, HM ₀ is the initial value of the handover offset between cells, and HM _sj is the distance from the edge terminal to be handed over to the target cell. The handover offset of the handover target cell. 8. The device according to claim 6, wherein the second determination module is specifically configured to: Determine the load balancing factor of the edge terminal to be switched according to the following formula: $\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}}$ Among them, α is the load balance factor of the edge terminal to be switched, N _i,j is the number of resource blocks RB required by the target cell j to be switched to meet the service rate of the i-th edge terminal to be switched, and N _j is the target cell to be switched j is the number of RBs that meet the service rate requirements of all terminals in the cell, N _i,s is the number of RBs required by the cell s to meet the service rate requirements of the i-th edge terminal to be handed over, and N _s is the number of RBs that the cell s needs to meet The number of RBs required by the service rate of all terminals in the cell, i>0, s>0, j>0. 9. The device according to any one of claims 6 to 8, wherein the second determination module is further configured to: After the load balance factor of the edge terminal to be switched is determined, the edge terminal to be switched, the target cell to be switched and their corresponding load balance factors are stored in the user list to be switched, and according to the load balance factor of the Sorting all the load balance factors in the user list to be switched by size, and selecting the edge terminal to be switched and the target cell to be switched corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be switched. 10. The device according to claim 6, wherein the switching module is also used for: After handing over the edge terminal to be handed over corresponding to the load balance factor that has the greatest impact on the load of the local cell and the target cell to be handed over to the target cell to be handed over corresponding to the edge terminal to be handed over, if the local cell If the load value is less than the overload threshold value, then within the set time, the load balancing is suspended, and the load balancing of the adjacent cells of the own cell is suspended.