CN108810907B - Virtual cell merging method, device and network system - Google Patents

Abstract

The embodiment of the invention provides a virtual cell merging method, a virtual cell merging device and a network system, relates to the technical field of network communication, and solves the problems that strong interference is generated between overlapped virtual cells in the prior art, so that the signal transmission rate between an RRH and a user is reduced, and the user rate of the whole network is low. Dividing an overlapping area consisting of at least 2 virtual Cell cells in a preset area; and when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area meet the merging condition, merging the first virtual Cell-1 and the second virtual Cell-2 meeting the merging condition in the overlapping area into a new virtual Cell Mu-Cell. The embodiment of the invention is used for providing a method for combining overlapped virtual cells.

Description

Method, device and network system for combining virtual cells

technical field

The present invention relates to the technical field of network communication, and in particular, to a method, device and network system for combining virtual cells.

Background technique

Facing the demand for data traffic that will increase thousands of times in 2020 and the future, the fifth-generation mobile communication technology (full name in English: 5th-Generation, abbreviation: 5G) system will be built on large-scale antennas, ultra-dense networking, and full-spectrum connectivity. In the high-capacity hotspot scenario, the system capacity is increased by increasing the number of low-power nodes, so that the density of low-power nodes may reach ten times or even higher than the current base station deployment density, thus forming an ultra-dense network.

In order to reduce the interference between communication cells in an ultra-densely deployed network, this problem can be solved by the user-centric virtualized cell technology; among them, the virtualized cell (full name in English: Virtual Cell) technology refers to breaking the boundary restrictions of virtual cells, Provides wireless access without borders, builds coverage around users, provides services, and virtual cells are quickly updated as users move and network conditions; by forming virtual cells, edge users can be eliminated, and at the same time, there is always a comparison between virtual cells and terminals. Good link quality enables users to obtain consistent high quality of service (English full name: Quality of Service, referred to as: QoS)/Quality of Experience (English full name: Quality of Experience, referred to as : QoE); therefore, the user-centered virtualized cell technology has attracted more and more attention.

However, in the research on the user-centric virtualized cell technology, it is found that different users may choose a or multiple identical remote radio heads (English full name: Remote Radio Head, abbreviation: RRH), resulting in overlapping virtual cells, and strong interference will occur between the overlapping virtual cells, making the signal transmission between the RRH and the user. The rate is reduced, resulting in a lower rate of users on the entire network.

It can be seen from the above that strong interference will occur between overlapping virtual cells in the prior art, which reduces the rate of signal transmission between the RRH and the user, resulting in a lower rate of users in the entire network.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method, device and network system for combining virtual cells, which solve the problem that strong interference will occur between overlapping virtual cells in the prior art, so that the rate of signal transmission between the RRH and the user is reduced, This leads to the problem that the user rate of the entire network is low.

To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

In a first aspect, an embodiment of the present invention provides a method for combining virtual cells, including:

dividing an overlapping area consisting of at least 2 virtual cells in the preset area;

When the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area satisfy the merging condition, the first virtual cell Cell-1 and the second virtual cell Cell-2 that satisfy the merging condition in the overlapping area are merged into a new The virtual cell Mu-Cell;

The first virtual cell Cell-1 and the second virtual cell Cell-2 belong to one of at least two virtual cells Cell, respectively, and the first virtual cell Cell-1 and the second virtual cell Cell-2 are different, and the first virtual cell Cell-1 and the second virtual cell Cell-2 are different. The cell Cell-1 serves at least one first UE, the second virtual cell Cell-2 serves at least one second UE, the new virtual cell Mu-Cell serves at least one first UE, and at least To provide services for one second UE, the virtual cell Cell includes at least one remote radio head RRH.

Preferably, before determining the overlapping area composed of at least two virtual cells in the preset area, the method further includes:

Obtain the RSRP value of the reference signal received power measured by the UE through the remote radio head RRH-1 in the preset area, where the remote radio head RRH-1 is any remote radio head RRH in the preset area;

Compare the size of the RSRP value and the RSRP threshold value;

When the RSRP value ≥ the RSRP threshold value, the first remote radio head RRH is re-divided to form a virtual cell Cell serving the UE.

Preferably, the merging conditions include:

The area covered by the first virtual cell Cell-1 and the area covered by the second virtual cell Cell-2 satisfy the first preset combining condition, the total number of UEs in the first virtual cell Cell-1 and the total number of UEs in the second virtual cell Cell-2 The second preset merging condition is met, and the first virtual cell Cell-1 and the second virtual cell Cell-2 meet the third preset merging condition;

Merging the first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging conditions in the overlapping area into a new virtual cell Mu-Cell, including:

When the area covered by the first virtual cell Cell-1 and the area covered by the second virtual cell Cell-2 satisfy the first preset condition, the total number of UEs in the first virtual cell Cell-1 and the total number of UEs in the second virtual cell Cell-2 When the second preset merging condition is met, and the first virtual cell Cell-1 and the second virtual cell Cell-2 meet the third preset merging condition, the first virtual cell Cell-1 and the second virtual cell in the overlapping area are merged. Cell-2 is merged into a new virtual cell Mu-Cell.

Preferably, the first preset merging conditions include:

The number of RRHs shared by the first virtual cell Cell-1 and the second virtual cell Cell-2 is greater than 0.

Preferably, the second preset merging conditions include:

The total number of UEs in the first virtual cell is less than or equal to the first preset user threshold, and the total number of UEs in the second virtual cell is less than or equal to the second preset user threshold.

Preferably, the third preset combining condition includes: the ratio of the total number of antennas of the RRHs of the first virtual cell to the total number of antennas of the UEs of the first virtual cell is greater than or equal to 1, and the total number of antennas of the RRHs of the second virtual cell and the total number of antennas of the second virtual cell are greater than or equal to 1. The ratio of the total number of antennas of UEs in the cell is greater than or equal to 1.

Preferably, the first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging conditions in the overlapping area are merged into a new virtual cell Mu-Cell, including:

acquiring the number of RRHs shared by different first virtual cells Cell-1 and different second virtual cells Cell-2 in the overlapping area;

Sorting the number of RRHs shared by the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area in descending order;

According to the order of the number of RRHs shared by the first virtual cell Cell-1 and the second virtual cell Cell-2, the first virtual cell Cell-1 and the second virtual cell Cell-2 are merged into a new virtual cell Mu-Cell.

Preferably, the method further includes:

When the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area do not meet the merging conditions, compare whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH; wherein , the third virtual cell Cell-3 and the fourth virtual cell Cell-4 belong to at least 2 virtual cells Cell, and one of the new virtual cells Mu-Cell, and the third virtual cell Cell-3 and the fourth virtual cell Cell-4 -4 different.

Preferably, after merging the first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging conditions in the overlapping area into a new virtual cell Mu-Cell, the method further includes:

When the third virtual cell Cell-3 and the fourth virtual cell Cell-4 do not meet the merging conditions, compare whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, where the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH. The virtual cell Cell-3 and the fourth virtual cell Cell-4 belong to at least two virtual cells Cell, and one of the new virtual cells Mu-Cell, and the third virtual cell Cell-3 and the fourth virtual cell Cell-4 are different .

Preferably, comparing whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH includes:

acquiring the RRH included in the third virtual cell Cell-3 in the overlapping area, and the RRH included in the fourth virtual cell Cell-4;

Compare whether the RRH included in the third virtual cell Cell-3 and the RRH included in the fourth virtual cell Cell-4 have the same shared RRH;

When the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, the same shared RRH is allocated according to the RRH offset link.

Preferably, the RRH bias link includes:

When the same shared RRH is removed from the third virtual cell Cell-3, the ratio of the total number of antennas of the RRHs of the third virtual cell Cell-3 to the total number of antennas of the UEs of the third virtual cell Cell-3 is greater than or equal to 1, and the fourth After removing the same shared RRH from the virtual cell Cell-4, the ratio of the total number of antennas of the RRHs of the fourth virtual cell Cell-4 to the total number of antennas of the UEs of the fourth virtual cell Cell-4 is greater than or equal to 1. When the third virtual cell Cell-4 The sum of the RSRP values of -3 is greater than the sum of the RSRP values of the fourth virtual cell Cell-4, and the same shared RRH is merged into the third virtual cell Cell-3;

or

When the sum of the RSRP values of the third virtual cell Cell-3 is less than the sum of the RSRP values of the fourth virtual cell Cell-4, the same shared RRH is merged into the fourth virtual cell Cell-4.

Preferably, the RRH bias link includes:

When the same shared RRH is removed from the third virtual cell Cell-3, the ratio of the total number of antennas of the RRHs of the third virtual cell Cell-3 to the total number of antennas of the UEs of the third virtual cell Cell-3 is greater than or equal to 1, and the fourth After removing the same shared RRH from the virtual cell Cell-4, the ratio of the total number of antennas of the RRHs of the fourth virtual cell Cell-4 to the total number of antennas of the UEs of the fourth virtual cell Cell-4 is less than 1, and the same shared RRH is combined. to the fourth virtual cell Cell-4;

or

It is determined that after removing the same shared RRH from the third virtual cell Cell-3, the ratio of the total number of antennas of the RRHs of the third virtual cell Cell-3 to the total number of antennas of the UEs of the third virtual cell Cell-3 is less than 1, and the fourth virtual cell After removing the same shared RRH from the cell Cell-4, the ratio of the total number of antennas of the RRHs of the fourth virtual cell Cell-4 to the total number of antennas of the UEs of the fourth virtual cell Cell-4 is greater than or equal to 1, and the same shared RRH is combined. to the third virtual cell Cell-3.

Preferably, the RRH bias link includes:

acquiring the RSRP value measured by the UE in the third virtual cell Cell-3 through the silent RRH;

acquiring the RSRP value measured by the UE in the fourth virtual cell Cell-4 through the silent RRH, where the silent RRH includes: the RRHs in the overlapping area that are not selected by the third virtual cell Cell-3 and the fourth virtual cell Cell-4;

When the same shared RRH is removed from the third virtual cell Cell-3, the ratio of the total number of antennas of the RRHs of the third virtual cell Cell-3 to the total number of antennas of the UEs of the third virtual cell Cell-3 is less than 1, and the fourth virtual cell After Cell-4 removes the same shared RRH, the ratio of the total number of antennas of the RRHs in the fourth virtual cell Cell-4 to the total number of antennas of the UEs in the fourth virtual cell Cell-4 is less than 1, and the number of antennas in the third virtual cell Cell-3 When the sum of the RSRP values measured by all the UEs through the muted RRHs is greater than or equal to the sum of the RSRP values measured by all the UEs in the fourth virtual cell Cell-4 through the muted RRHs, the muted RRHs with the largest reference value of the RSRP value are combined To the third virtual cell Cell-3, merge the same shared RRH into the fourth virtual cell Cell-4;

or

When the sum of the RSRP values measured by all the UEs in the third virtual cell Cell-3 through the muted RRH is less than the sum of the RSRP values measured by all the UEs in the fourth virtual cell Cell-4 through the muted RRH, the reference of the RSRP value is The silent RRH with the largest value is merged into the fourth virtual cell Cell-4, and the same shared RRH is merged into the third virtual cell Cell-3.

Preferably, the method further includes:

When the third virtual cell Cell-3 and the fourth virtual cell Cell-4 do not have the same shared RRH, the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area are fully processed according to the precoding algorithm. Optimization of network UE rate.

Preferably, when the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, after allocating the same shared RRH according to the RRH offset link, the method further includes:

The UE rate of the whole network is optimized for the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area according to the precoding algorithm.

Preferably, according to the precoding algorithm, the optimization of the UE rate of the entire network for the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area includes:

Obtain the precoding direction vector W of the UE in the first multi-user virtual cell;

obtaining the initial value D ⁰ of the power control factor of any UE in the first multi-user virtual cell;

acquiring the shared channel matrix L of the RRH of the first multi-user virtual cell and the RRH of the second multi-user virtual cell;

According to the shared channel matrix L of the RRH of the first multi-user virtual cell and the RRH of the second multi-user virtual cell, construct the first calculation formula, the second calculation formula and the third calculation formula for maximizing the user rate of the whole network by the power diagonal vector ;

Bring the initial value D ⁰ of the power control factor into the third calculation formula to iteratively solve the optimal solution D of the power control factor;

时，迭代停止，得到对角矩阵D＝D^q；The optimal solution D of the power control factor is brought into the second calculation formula, and the geometric programming solves D ^q , where, when

When , the iteration stops, and the diagonal matrix D=D ^q is obtained;

The diagonal matrix D=D ^q is brought into the first calculation formula to obtain the maximum user rate of the entire network; wherein, the first calculation formula includes:

Among them, J _K represents the multi-user interference in the first multi-user virtual cell and the co-channel interference between the first multi-user virtual cell, and σ _k ² is the additive white Gaussian noise of user k;

The second calculation formula includes:

in,

The third calculation formula includes:

g _m,k '(DD ^q-1 ), q is an integer greater than or equal to 1;

为功率控制因子初始值；Dq为迭代算法中功率控制因子的当前值，Dq-1为迭代算法中功率控制因子的前一迭代时刻的值，R(Dq)为功率控制因子Dq下的用户总速率；ε为系统设定的误差值，判定用户速率收敛；

为用户k在多用户虚拟小区m内的信道矢量(包括大尺度信道矢量与小尺度信道矢量)；

为用户k在多用户虚拟小区m内的归一化预编码矢量；

为用户k在多用户虚拟小区t内的大尺度信道矢量。in,

is the initial value of the power control factor; Dq is the current value of the power control factor in the iterative algorithm, Dq-1 is the value at the previous iteration of the power control factor in the iterative algorithm, and R(Dq) is the total user power under the power control factor Dq rate; ε is the error value set by the system to determine the user rate convergence;

is the channel vector of user k in multi-user virtual cell m (including large-scale channel vector and small-scale channel vector);

is the normalized precoding vector of user k in multi-user virtual cell m;

is the large-scale channel vector of user k in multi-user virtual cell t.

In a second aspect, an embodiment of the present invention provides an apparatus for combining virtual cells, including:

an area dividing unit, configured to divide an overlapping area consisting of at least two virtual cells in the preset area;

The processing unit is configured to, when the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area divided by the area dividing unit satisfy the merging condition, combine the first virtual cell Cell-1 and the second virtual cell Cell-2 that satisfy the merging condition in the overlapping area The second virtual cell Cell-2 is merged into a new virtual cell Mu-Cell;

The first virtual cell Cell-1 and the second virtual cell Cell-2 belong to one of at least two virtual cells Cell, respectively, and the first virtual cell Cell-1 and the second virtual cell Cell-2 are different, and the first virtual cell Cell-1 and the second virtual cell Cell-2 are different. The cell Cell-1 serves at least one first UE, the second virtual cell Cell-2 serves at least one second UE, the new virtual cell Mu-Cell serves at least one first UE, and at least To provide services for one second UE, the virtual cell Cell includes at least one remote radio head RRH.

Preferably, the device further includes: a data acquisition unit;

A data acquisition unit, configured to acquire the RSRP value of the reference signal received power measured by the UE through the remote radio head RRH-1 in the preset area, where the remote radio head RRH-1 is any remote radio head RRH in the preset area ;

A processing unit, specifically for comparing the size of the RSRP value obtained by the data acquisition unit and the RSRP threshold value;

The area dividing unit is specifically configured to re-divide the first remote radio head RRH to form a virtual cell Cell serving the UE when the processing unit determines that the RSRP value ≥ the RSRP threshold value.

Preferably, the processing unit is specifically configured to compare the third virtual cell Cell-3 and the fourth virtual cell Cell-4 when the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area do not meet the merging conditions Whether there is the same shared RRH; wherein, the third virtual cell Cell-3 and the fourth virtual cell Cell-4 belong to at least 2 virtual cells Cell, and one of the new virtual cells Mu-Cell, and the third virtual cell Cell-3 is different from the fourth virtual cell Cell-4.

Preferably, the processing unit is specifically configured to compare whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same A shared RRH, wherein the third virtual cell Cell-3 and the fourth virtual cell Cell-4 belong to at least 2 virtual cells Cell, and one of the new virtual cells Mu-Cell, and the third virtual cell Cell-3 Different from the fourth virtual cell Cell-4.

preferably,

a data acquisition unit, further configured to acquire the RRHs included in the third virtual cell Cell-3 in the overlapping area, and the RRHs included in the fourth virtual cell Cell-4;

a processing unit, specifically configured to compare whether the RRH included in the third virtual cell Cell-3 and the RRH included in the fourth virtual cell Cell-4 obtained by the data obtaining unit have the same shared RRH;

The area dividing unit is specifically configured to allocate the same shared RRH according to the RRH offset link when the processing unit compares that the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH.

Preferably, the processing unit is specifically configured to, when the third virtual cell Cell-3 and the fourth virtual cell Cell-4 do not have the same shared RRH, perform a precoding algorithm on the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area according to the precoding algorithm. The fourth virtual cell Cell-4 performs optimization of the UE rate of the entire network.

Preferably, the processing unit is specifically configured to, after the area dividing unit allocates the same shared RRH according to the RRH offset link, divides the third virtual cell Cell-3 and the fourth virtual cell Cell-3 in the overlapping area according to the precoding algorithm. 4. Optimize the UE rate of the entire network.

In a third aspect, an embodiment of the present invention provides a network system, including: UE, RRH, BBU, virtual cell combining device, MME, SGW, PGW, and IMS; wherein the virtual cell combining device belongs to BBU.

The method, device, and network system for merging virtual cells provided by the embodiments of the present invention divide the overlapping area of virtual cells. Since multiple virtual cells may exist in the overlapping area at the same time, there may be strong formation between virtual cells and virtual cells. Therefore, it is necessary to merge the first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging conditions in the overlapping area into a new virtual cell Mu-Cell, so that the virtual cells that meet the merging conditions are merged, The strong interference between the original virtual cells is eliminated, the signal transmission rate between the RRH and the user is improved, and the user rate of the entire network is improved, thereby solving the problem that the overlapping virtual cells in the prior art will cause strong interference. The interference reduces the rate of signal transmission between the RRH and the user; and the same RRH may serve multiple users at the same time, which leads to the problem of low rate of users in the entire network.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a flowchart of a method for merging virtual cells according to an embodiment of the present invention;

2-a to 2-d are another flowchart of a method for combining virtual cells according to an embodiment of the present invention;

3-a and 3-b are logical flowcharts of a method for merging virtual cells according to an embodiment of the present invention;

4-a to 4-e are schematic diagrams of merging virtual cells in practical applications with a method for merging virtual cells provided by the present invention;

5 is a schematic structural diagram of an apparatus for combining virtual cells according to an embodiment of the present invention;

FIG. 6 is another schematic structural diagram of an apparatus for combining virtual cells according to an embodiment of the present invention;

7-a and 7-b are schematic structural diagrams of a network system according to an embodiment of the present invention.

Reference number:

Combining means for virtual cells-10;

Area division unit-101;

processing unit-102;

Data Acquisition Unit-103.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The technical solutions provided by the embodiments of the present invention are essentially or parts that contribute to the prior art, or all or part of the technical solutions can be implemented by software programs, hardware, firmware, or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the procedures or functions in accordance with the embodiments of the present invention are produced, in whole or in part. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored on or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted over a wire from a website site, computer, server or data center (eg coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.) to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server, data center, etc. that includes one or more available media integrated. The usable media may be magnetic media (eg, floppy disks, magnetic disks, magnetic tapes), optical media (eg, digital video discs (DVDs)), or semiconductor media (eg, solid state drives (SSDs)), and the like.

Embodiment 1. An embodiment of the present invention provides a method for combining virtual cells, as shown in FIG. 1 , including:

S101. Divide an overlapping area consisting of at least two virtual cells in a preset area.

S102. When the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area satisfy the merging condition, merge the first virtual cell Cell-1 and the second virtual cell Cell-2 that satisfy the merging condition in the overlapping area into a new virtual cell Mu-Cell.

The first virtual cell Cell-1 and the second virtual cell Cell-2 respectively belong to one of at least two virtual cells Cel, and the first virtual cell Cell-1 and the second virtual cell Cell-2 are different, and the first virtual cell Cell-1 is different from the second virtual cell Cell-2. The cell Cell-1 serves at least one first UE, the second virtual cell Cell-2 serves at least one second UE, the new virtual cell Mu-Cell serves at least one first UE, and at least To provide services for one second UE, the virtual cell Cell includes at least one remote radio head RRH.

The method for merging virtual cells provided by the embodiments of the present invention divides the overlapping area of the virtual cells. Since multiple virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells and the virtual cells, it is necessary to pass The first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging condition in the overlapping area are merged into a new virtual cell Mu-Cell, so that the virtual cells that meet the merging condition are merged, so that the original virtual cell is merged. The elimination of strong interference between cells increases the rate of signal transmission between the RRH and users, and increases the rate of users in the entire network, thereby solving the problem of strong interference between overlapping virtual cells in the prior art, making the RRH and the user faster. The rate of signal transmission between users is reduced; and because the same RRH may serve multiple users at the same time, the problem of low rate of users in the entire network is caused.

Embodiment 2. An embodiment of the present invention provides a method for combining virtual cells. As shown in Figure 2-a to Figure 2-d, the method includes:

Scenario 1. An embodiment of the present invention provides a method for combining virtual cells. As shown in Figure 2-a, the method includes:

S1010: Acquire a reference signal received power RSRP value measured by the UE through a remote radio head RRH-1 in a preset area, where the remote radio head RRH-1 is any remote radio head RRH in the preset area.

S1020. Compare the size of the RSRP value and the RSRP threshold value.

It should be noted that the RSRP threshold refers to the minimum RSRP set by the UE; for example, if the RSRP threshold is -130dBm, and the RSRP value measured by the UE through RRH-a is -100dBm, the measured RSRP value at this time -100dBm is greater than the RSRP threshold value -130dBm, so the RRH-a can be used as the RRH serving the UE; if the RSRP value measured by the UE through RRH-b is less than the RSRP threshold value, the UE through RRH-b The signal cannot be demodulated, so RRH-b cannot be used as the RRH serving the UE.

S1030. When the RSRP value ≥ the RSRP threshold value, re-divide the first remote radio head RRH to form a virtual cell Cell serving the UE.

S1040. Divide an overlapping area consisting of at least two virtual cells in the preset area.

S1050. When the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area do not meet the merging conditions, compare whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH ; wherein, the third virtual cell Cell-3 and the fourth virtual cell Cell-4 belong to at least two virtual cells Cell, and one of the new virtual cells Mu-Cell, and the third virtual cell Cell-3 and the fourth virtual cell Cell-3 Cell-4 is different.

Preferably, the merging conditions include:

The area covered by the first virtual cell Cell-1 and the area covered by the second virtual cell Cell-2 satisfy the first preset combining condition, the total number of UEs in the first virtual cell Cell-1 and the total number of UEs in the second virtual cell Cell-2 The second preset merging condition is met, and the first virtual cell Cell-1 and the second virtual cell Cell-2 meet the third preset merging condition;

Merging the first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging conditions in the overlapping area into a new virtual cell Mu-Cell, including:

When the area covered by the first virtual cell Cell-1 and the area covered by the second virtual cell Cell-2 satisfy the first preset condition, the total number of UEs in the first virtual cell Cell-1 and the total number of UEs in the second virtual cell Cell-2 When the second preset merging condition is met, and the first virtual cell Cell-1 and the second virtual cell Cell-2 meet the third preset merging condition, the first virtual cell Cell-1 and the second virtual cell in the overlapping area are merged. Cell-2 is merged into a new virtual cell Mu-Cell.

Preferably, the first preset merging conditions include:

The number of RRHs shared by the first virtual cell Cell-1 and the second virtual cell Cell-2 is greater than 0.

Preferably, the second preset merging conditions include:

The total number of UEs in the first virtual cell is less than or equal to the first preset user threshold, and the total number of UEs in the second virtual cell is less than or equal to the second preset user threshold.

It should be noted that, in practical applications, the first preset user threshold and the second preset threshold may be the same or different.

Preferably, the third preset combining condition includes: the ratio of the total number of antennas of the RRHs of the first virtual cell to the total number of antennas of the UEs of the first virtual cell is greater than or equal to 1, and the total number of antennas of the RRHs of the second virtual cell and the total number of antennas of the second virtual cell are greater than or equal to 1. The ratio of the total number of antennas of UEs in the cell is greater than or equal to 1.

S1060. When the third virtual cell Cell-3 and the fourth virtual cell Cell-4 do not have the same shared RRH, perform a precoding algorithm on the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area Optimize the UE rate of the entire network.

In the method for merging virtual cells provided by the embodiments of the present invention, by dividing overlapping areas of virtual cells, since multiple virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells and the virtual cells, when the overlapping area When the first virtual cell Cell-1 and the second virtual cell Cell-2 do not meet the merging conditions, there may be overlaps between the two virtual cells in the overlapping area because they do not meet the merging conditions. Therefore, it is necessary to compare the third virtual cell. Whether the virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, when the third virtual cell Cell-3 and the fourth virtual cell Cell-4 do not have the same shared RRH, in order to The Internet access rate is improved to the optimum; therefore, it is also necessary to optimize the combined virtual cell according to the precoding algorithm to improve the signal transmission rate between the RRH and the user, improve the user rate of the entire network, and solve the problem of existing problems. In the technology, there will be strong interference between overlapping virtual cells, which reduces the rate of signal transmission between the RRH and the user.

Scenario 2. An embodiment of the present invention provides a method for combining virtual cells, as shown in Figure 2-b, including:

S1011 . Acquire a reference signal received power RSRP value measured by the UE through a remote radio head RRH-1 in a preset area, where the remote radio head RRH-1 is any remote radio head RRH in the preset area.

It should be noted that, in practical applications, the RSRP value of the reference signal received power measured by the UE through the remote radio head RRH-1 in the preset area includes at least the following two situations:

1. The RSRP value of the reference signal received power measured by the UE through the remote radio head RRH-1 in the preset area, where the UE here measures all the RSRP values, and then compares each RSRP value with the RSRP threshold value In this way, the RSRP value of each RRH can be measured in detail, and the RRH can be allocated to the UE more conveniently.

2. Set the RSRP reference value. When the UE has multiple RRHs to choose from, it is sorted according to the RRH signal to find the RRH whose RSRP value is greater than or equal to the RSRP threshold value, thereby shortening the calculation time for the UE to measure the RSRP value through the RRH.

S1021. Compare the size of the RSRP value and the RSRP threshold value.

S1031. When the RSRP value is greater than or equal to the RSRP threshold value, re-divide the first remote radio head RRH to form a virtual cell Cell serving the UE.

S1041. Divide an overlapping area consisting of at least two virtual cells in a preset area.

S1051. When the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area do not meet the merging conditions, compare whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH ; wherein, the third virtual cell Cell-3 and the fourth virtual cell Cell-4 belong to at least two virtual cells Cell, and one of the new virtual cells Mu-Cell, and the third virtual cell Cell-3 and the fourth virtual cell Cell-3 Cell-4 is different.

S1061. When the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, allocate the same shared RRH according to the RRH offset link.

S1071 , according to the precoding algorithm, optimize the UE rate of the whole network for the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area.

In the method for merging virtual cells provided by the embodiments of the present invention, by dividing overlapping areas of virtual cells, since multiple virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells and the virtual cells, when the overlapping area When the first virtual cell Cell-1 and the second virtual cell Cell-2 do not meet the merging conditions, there may be overlaps between the two virtual cells in the overlapping area because they do not meet the merging conditions. Therefore, it is necessary to compare the third virtual cell. Whether the virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, when the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, the RRH offset needs to be The overlapping RRHs are re-allocated in the link; in order to improve the Internet access rate of the UE that has allocated the virtual cell to the optimum; therefore, it is also necessary to optimize the combined virtual cell according to the precoding algorithm to improve the relationship between the RRH and the user. The rate of signal transmission increases the user rate of the entire network, and solves the problem of strong interference between overlapping virtual cells in the prior art, which reduces the rate of signal transmission between the RRH and the user.

Scenario 3. An embodiment of the present invention provides a method for combining virtual cells, as shown in Figure 2-c, including:

S1012: Acquire a reference signal received power RSRP value measured by the UE through the remote radio head RRH-1 in a preset area, where the remote radio head RRH-1 is any remote radio head RRH in the preset area.

S1022, compare the size of the RSRP value and the RSRP threshold value.

S1032. When the RSRP value is greater than or equal to the RSRP threshold value, re-divide the first remote radio head RRH to form a virtual cell Cell serving the UE.

S1042. Divide an overlapping area consisting of at least two virtual cells in the preset area.

S1052. When the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area satisfy the merging condition, merge the first virtual cell Cell-1 and the second virtual cell Cell-2 that satisfy the merging condition in the overlapping area into a new virtual cell Mu-Cell.

It should be noted that, in an actual application, it is necessary to repeat the merging of the first virtual cell Cell-1 and the second virtual cell Cell-2. When a new virtual cell Mu-Cell is formed, the new virtual cell Mu-Cell is used as the The first virtual cell Cell-1 or the second virtual cell Cell-2 continues to combine until the combining conditions are not satisfied between the first virtual cell Cell-1 and the second virtual cell Cell-2.

Preferably, the first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging conditions in the overlapping area are merged into a new virtual cell Mu-Cell, including:

acquiring the number of RRHs shared by different first virtual cells Cell-1 and different second virtual cells Cell-2 in the overlapping area;

Sorting the number of RRHs shared by the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area in descending order;

According to the order of the number of RRHs shared by the first virtual cell Cell-1 and the second virtual cell Cell-2, the first virtual cell Cell-1 and the second virtual cell Cell-2 are merged into a new virtual cell Mu-Cell.

S1062. When the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, allocate the same shared RRH according to the RRH offset link.

Preferably, the RRH bias link includes:

When the same shared RRH is removed from the third virtual cell Cell-3, the ratio of the total number of antennas of the RRHs of the third virtual cell Cell-3 to the total number of antennas of the UEs of the third virtual cell Cell-3 is greater than or equal to 1, and the fourth After removing the same shared RRH from the virtual cell Cell-4, the ratio of the total number of antennas of the RRHs of the fourth virtual cell Cell-4 to the total number of antennas of the UEs of the fourth virtual cell Cell-4 is greater than or equal to 1. When the third virtual cell Cell-4 The sum of the RSRP values of -3 is greater than the sum of the RSRP values of the fourth virtual cell Cell-4, and the same shared RRH is merged into the third virtual cell Cell-3;

or

When the sum of the RSRP values of the third virtual cell Cell-3 is less than the sum of the RSRP values of the fourth virtual cell Cell-4, the same shared RRH is merged into the fourth virtual cell Cell-4.

Preferably, the RRH bias link includes:

When the same shared RRH is removed from the third virtual cell Cell-3, the ratio of the total number of antennas of the RRHs of the third virtual cell Cell-3 to the total number of antennas of the UEs of the third virtual cell Cell-3 is greater than or equal to 1, and the fourth After removing the same shared RRH from the virtual cell Cell-4, the ratio of the total number of antennas of the RRHs of the fourth virtual cell Cell-4 to the total number of antennas of the UEs of the fourth virtual cell Cell-4 is less than 1, and the same shared RRH is combined. to the fourth virtual cell Cell-4;

or

It is determined that after removing the same shared RRH from the third virtual cell Cell-3, the ratio of the total number of antennas of the RRHs of the third virtual cell Cell-3 to the total number of antennas of the UEs of the third virtual cell Cell-3 is less than 1, and the fourth virtual cell After removing the same shared RRH from the cell Cell-4, the ratio of the total number of antennas of the RRHs of the fourth virtual cell Cell-4 to the total number of antennas of the UEs of the fourth virtual cell Cell-4 is greater than or equal to 1, and the same shared RRH is combined. to the third virtual cell Cell-3.

Preferably, the RRH bias link includes:

acquiring the RSRP value measured by the UE in the third virtual cell Cell-3 through the silent RRH;

acquiring the RSRP value measured by the UE in the fourth virtual cell Cell-4 through the silent RRH, where the silent RRH includes: the RRHs in the overlapping area that are not selected by the third virtual cell Cell-3 and the fourth virtual cell Cell-4;

When the same shared RRH is removed from the third virtual cell Cell-3, the ratio of the total number of antennas of the RRHs of the third virtual cell Cell-3 to the total number of antennas of the UEs of the third virtual cell Cell-3 is less than 1, and the fourth virtual cell After Cell-4 removes the same shared RRH, the ratio of the total number of antennas of the RRHs in the fourth virtual cell Cell-4 to the total number of antennas of the UEs in the fourth virtual cell Cell-4 is less than 1, and the number of antennas in the third virtual cell Cell-3 When the sum of the RSRP values measured by all the UEs through the muted RRHs is greater than or equal to the sum of the RSRP values measured by all the UEs in the fourth virtual cell Cell-4 through the muted RRHs, the muted RRHs with the largest reference value of the RSRP value are combined To the third virtual cell Cell-3, merge the same shared RRH into the fourth virtual cell Cell-4;

or

When the sum of the RSRP values measured by all the UEs in the third virtual cell Cell-3 through the muted RRH is less than the sum of the RSRP values measured by all the UEs in the fourth virtual cell Cell-4 through the muted RRH, the reference of the RSRP value is The silent RRH with the largest value is merged into the fourth virtual cell Cell-4, and the same shared RRH is merged into the third virtual cell Cell-3.

S1072 , according to the precoding algorithm, optimize the UE rate of the entire network for the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area.

In the method for merging virtual cells provided by the embodiments of the present invention, by dividing overlapping areas of virtual cells, since multiple virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells and the virtual cells, the overlapping area may be merged. The first virtual cell Cell-1 and the second virtual cell Cell-2 that satisfy the merging conditions are merged into a new virtual cell Mu-Cell; at this time, there may be overlaps between the two virtual cells in the overlapping area due to the unsatisfactory merging conditions. Therefore, it is necessary to compare whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH. When the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH During RRH, the overlapping RRHs need to be re-allocated according to the RRH offset link; in order to optimize the Internet access rate of the UE after the virtual cell is allocated; therefore, it is also necessary to optimize the combined virtual cell according to the precoding algorithm. Thereby, the rate of signal transmission between the RRH and the user is improved, the rate of the users of the entire network is improved, and the strong interference between the overlapping virtual cells in the prior art is solved, which makes the signal transmission between the RRH and the user more efficient. speed reduction problem.

Scenario 4. An embodiment of the present invention provides a method for combining virtual cells, as shown in Figure 2-d, including:

S1013: Acquire a reference signal received power RSRP value measured by the UE through the remote radio head RRH-1 in a preset area, where the remote radio head RRH-1 is any remote radio head RRH in the preset area.

S1023, compare the size of the RSRP value and the RSRP threshold value.

S1033. When the RSRP value is greater than or equal to the RSRP threshold value, re-divide the first remote radio head RRH to form a virtual cell Cell serving the UE.

S1043. Divide an overlapping area consisting of at least two virtual cells in the preset area.

S1053. When the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area satisfy the merging condition, merge the first virtual cell Cell-1 and the second virtual cell Cell-2 that satisfy the merging condition in the overlapping area into a new virtual cell Mu-Cell.

S1063. When the third virtual cell Cell-3 and the fourth virtual cell Cell-4 do not have the same shared RRH, perform a precoding algorithm on the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area Optimize the UE rate of the entire network.

Preferably, according to the precoding algorithm, the optimization of the UE rate of the entire network for the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area includes:

Obtain the precoding direction vector W of the UE in the first multi-user virtual cell;

obtaining the initial value D ⁰ of the power control factor of any UE in the first multi-user virtual cell;

acquiring the shared channel matrix L of the RRH of the first multi-user virtual cell and the RRH of the second multi-user virtual cell;

According to the shared channel matrix L of the RRH of the first multi-user virtual cell and the RRH of the second multi-user virtual cell, construct the first calculation formula, the second calculation formula and the third calculation formula for maximizing the user rate of the whole network by the power diagonal vector ;

Bring the initial value D ⁰ of the power control factor into the third calculation formula to iteratively solve the optimal solution D of the power control factor;

时，迭代停止，得到对角矩阵D＝D^q；The optimal solution D of the power control factor is brought into the second calculation formula, and the geometric programming solves D ^q , where, when

When , the iteration stops, and the diagonal matrix D=D ^q is obtained;

The diagonal matrix D=D ^q is brought into the first calculation formula to obtain the maximum user rate of the entire network; wherein, the first calculation formula includes:

Among them, J _K represents the multi-user interference in the first multi-user virtual cell and the co-channel interference between the first multi-user virtual cell, and σ _k ² is the additive white Gaussian noise of user k;

The second calculation formula includes:

in,

The third calculation formula includes:

g _m,k '(D|D ^q-1 ), q is an integer greater than or equal to 1;

为功率控制因子初始值；D^q为迭代算法中功率控制因子的当前值，D^q-1为迭代算法中功率控制因子的前一迭代时刻的值，R(D^q)为功率控制因子D^q下的用户总速率；ε为系统设定的误差值，判定用户速率收敛；

为用户k在多用户虚拟小区m内的信道矢量(包括大尺度信道矢量与小尺度信道矢量)；

为用户k在多用户虚拟小区m内的归一化预编码矢量；

为用户k在多用户虚拟小区t内的大尺度信道矢量。in,

is the initial value of the power control factor; D ^q is the current value of the power control factor in the iterative algorithm, D ^q-1 is the value at the previous iteration of the power control factor in the iterative algorithm, and R(D ^q ) is the power control factor D ^q The total user rate under ε; ε is the error value set by the system, and the user rate is determined to be converged;

is the channel vector of user k in multi-user virtual cell m (including large-scale channel vector and small-scale channel vector);

is the normalized precoding vector of user k in multi-user virtual cell m;

is the large-scale channel vector of user k in multi-user virtual cell t.

In the method for merging virtual cells provided by the embodiments of the present invention, by dividing overlapping areas of virtual cells, since multiple virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells and the virtual cells, the overlapping area may be merged. The first virtual cell Cell-1 and the second virtual cell Cell-2 that satisfy the merging conditions are merged into a new virtual cell Mu-Cell; at this time, there may be overlaps between the two virtual cells in the overlapping area due to the unsatisfactory merging conditions. Therefore, it is necessary to compare whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH, when the third virtual cell Cell-3 and the fourth virtual cell Cell-4 do not have the same shared RRH When the RRH is set, it means that there is no overlap between each virtual cell in the overlapping area. In order to improve the Internet access rate of the UE after the virtual cell has been allocated to the optimum; Optimized to improve the signal transmission rate between the RRH and the user, improve the user rate of the entire network, and solve the problem that the overlapping virtual cells in the prior art will produce strong interference, making the signal between the RRH and the user. The transmission rate is reduced.

Embodiment 3. The embodiment of the present invention provides an implementation manner of a method for combining virtual cells in practical applications. As shown in Figure 3-a, Figure 3-b, and Figure 4-a-Figure 4-e, it includes:

It should be noted that the third embodiment aims to provide a method for combining virtual cells that is applied to the same frequency condition of the ultra-dense C-RAN downlink multi-antenna RRH (the RRH in the embodiment adopts two transmit antennas, and the user has a single antenna). It solves the problem of transforming the interference between virtual cells into multi-user interference in the virtual cell under the condition of uniform frequency reuse, and combining the hierarchical precoding algorithm to improve the average user spectral efficiency and the user rate of the entire network.

Step S1, according to the RSRP threshold, an initial virtual cell centered on the user is formed.

It should be noted that, in actual application, step S1 includes the following steps:

Step S11, according to the reference signal received power RSRP maximum principle, set the RSRP threshold, and select the RRH with the user's maximum RSRP difference within the threshold to form a user-centered virtual cell;

Step S12, numbering each user-centered virtual cell, as shown in Figure 4-a, V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11, V12, V13, V14 , V15, the initial number of virtual cells is the number of users 15;

Step S13, the RRHs in the entire network that are not selected by the user into the virtual cell are silenced.

for example:

As shown in Figure 4-a, according to the principle of maximum RSRP, 15 users sequentially select RRHs with strong nearby signals to form a user-centered virtual cell. P3, RRH-P5, RRH-P6 serve it, and other virtual cells are shown in sequence as shown in the figure; finally, the RRH-P1, RRH-P2, RRH-P7, RRH-P7, RRH-15 that are not selected into the virtual cells will be Handle silently.

Step S2, count the number of overlapping RRHs between virtual cells, and sort them from large to small.

It should be noted that, in practical application, step S2 includes the following steps:

Step S21, counting the number of overlapping RRHs between pairs of virtual cells;

Step S22, sorting from large to small according to the overlapping area.

for example:

As shown in Figure 4-a, according to the initial virtual cell division, the entire network can be divided into 5 overlapping areas. The overlapping area 1 includes VC1, VC2, and VC3. The maximum number of overlapping areas is between VC1 and VC2, with 3 overlapping areas. Area 2 includes VC4, VC5, and the maximum overlap is 1; Overlap 3 includes VC6, VC7, VC8, VC9, VC10, and the maximum overlap is between VC7 and VC8, with 5 overlapping; Overlap 4 includes VC11, VC12 , the maximum overlap number is 2; the overlap area 5 includes VC13, VC14, and VC15, and the maximum overlap number is between VC14 and VC15, with 3 overlaps.

Step S3, according to the merging condition, merge the virtual cells.

It should be noted that, in actual application, step S3 includes the following steps:

In step S31, as shown in FIG. 3-a, sorting is performed according to the number of overlapping RRHs of different overlapping areas in step S22, and each overlapping area sequentially determines whether the maximum overlapping number is greater than 0. If the maximum overlapping number of each overlapping area is equal to 0, it means that all the merging that meets the conditions have been completed, and then go to step S4.

Step S32, as shown in FIG. 3-a, if the maximum overlapping number of overlapping areas is greater than 0, it is judged whether the user sum of the two virtual cells with the maximum overlapping RRH number exceeds the user threshold. If it exceeds the threshold value, the merging condition is not satisfied, the maximum overlap number is set to 0, and then go to step S2 to reorder.

Step S33, as shown in Figure 3-a, if the two virtual cells with the largest overlapping RRHs satisfy the user threshold, determine whether the RRH sum of the two virtual cells and the antenna ratio of the user sum are greater than or equal to 1 according to the ZF precoding antenna condition. If the antenna ratio is less than 1, the merging condition is not satisfied, the maximum overlap number is set to 0, and the process goes to step S2 to reorder.

In step S34, after the merging conditions are satisfied as shown in Figure 3-a, the two virtual cells are merged, the total number of virtual cells is reduced by 1, the virtual cells are renumbered, and step S2 is performed to recalculate the overlapping number of virtual cells.

for example:

As shown in Figure 4-a, when the system sets the multi-user threshold V=3, according to step S2, the overlapping size of the sub-regions is sorted, and the maximum overlapping virtual cells in each overlapping region satisfy the user threshold and antenna ratio conditions, and the first merge is performed. In overlapping area 1, VC1 and VC2 are combined to form a new VC1, which includes: U1, U2; RRH-P2, RRH-P3, RRH-P4, RRH-P5, RRH-P6; in overlapping area 2, VC4 and VC5 are combined to form VC4, which includes: U4, U5; RRH-P9; In overlapping area 3, VC7 and VC8 are combined to form a new VC7, which includes: U7, U8; RRH-P8, RRH-P10, RRH-P11, RRH-P12, RRH -P13; In overlapping area 4, VC11 and VC12 are merged to form a new VC11, which includes: U11, U12; RRH-P17, RRH-P19, RRH-P20; In overlapping area 5, VC14 and VC15 are merged to form a new VC14, which includes : U14, U15; RRH-P14, RRH-P16, RRH-P18; after merging, the total number of virtual cells is reduced by 1, and the number of VC1, VC2, VC3, VC4, VC5, VC6, VC7, VC8, VC9, VC110 is renumbered, and the combined result is as follows shown in Figure 4-b.

Go to step S2, re-count the number of overlapping RRHs, the maximum overlapping number of overlapping area 2 and overlapping area 4 is 0, and the second merging is performed in overlapping areas 1, 3, and 5. According to the user threshold and antenna ratio conditions, after the second merging , and renumber them to form VC1, VC2, VC3, VC4, VC5, VC6, and VC7. The combined result is shown in Figure 4-c.

Go to step S2, re-count the number of overlapping RRHs as shown in Figure 3-a, the maximum overlapping number of overlapping areas 1, 2, 4, and 5 is 0, and the third merge is performed in overlapping area 3. According to the user threshold, VC3 is not satisfied The merging conditions are that VC4 and VC5 satisfy the user threshold and antenna ratio conditions. After the third merging, they are renumbered to form VC1, VC2, VC3, VC4, VC5, and VC6. The merging result is shown in Figure 4-c. So far, all overlapping areas no longer meet the merging conditions, all overlapping numbers are set to 0, and go to step S4.

Step S4, cyclically compare whether the two virtual cells share the same RRH.

It should be noted that, in actual application, step S4 includes the following steps:

After the conditional merging in step S3, there may be overlapping RRHs between the virtual cells that do not satisfy the conditional merging. Cyclic comparison of two virtual cells in turn, cycle to compare whether the two virtual cells share the same RRH; if not the same RRH, recycle the next RRH to compare each other until all RRHs in the virtual cell are cycled; if the same RRH , go to the RRH bias link. When the two-by-two cyclic comparison of all virtual cells is completed, the multi-user non-overlapping virtual cell division is completed, and the entire procedure ends.

Step S5, if the overlapping RRHs are disconnected, the two virtual cells satisfy the precoding antenna ratio, and the overlapping RRHs are awarded to the virtual cell with a larger RSRP.

It should be noted that, in actual application, step S5 includes the following steps:

For the overlapping RRHs after the conditional combination, if the two overlapping virtual cells are disconnected from the overlapping RRHs and the antenna ratio of the base station and the user satisfies ρ≥1, the overlapping RRHs are awarded to the virtual cell with a larger RSRP, and the cycle is returned after the decision is completed. Next virtual cell comparison.

Step S6, if only one virtual cell satisfies the precoding antenna ratio after the overlapping RRH is disconnected, the overlapping RRH is awarded to the virtual cell that does not satisfy the antenna ratio.

It should be noted that, in actual application, step S6 includes the following steps:

For the overlapping RRHs after the conditional combination, if the two overlapping virtual cells are disconnected from the overlapping RRHs, and the RRH and user antenna ratio of only one virtual cell satisfies ρ≥1, the overlapping RRH is awarded to the virtual cell that does not satisfy the antenna ratio. After the decision is completed, the loop returns to the next virtual cell comparison.

Step S7, if the two virtual cells do not satisfy the precoding antenna ratio after the overlapping RRHs are disconnected, add a muted RRH to one of the virtual cells, and the overlapping RRH is awarded to a virtual cell that does not add the muted RRH.

It should be noted that, in actual application, step S7 includes the following steps:

For the overlapping RRHs after conditional combination, if the two overlapping virtual cells are disconnected from the overlapping RRHs, and the RRHs and user antenna ratios of the two virtual cells do not satisfy ρ≥1, the RRH with the largest RSRP is selected from the silent RRHs. Select to join the virtual cell, and the overlapping RRH is judged to the virtual cell that has not joined the silent RRH. After the judgment is completed, the loop returns to the next virtual cell for comparison.

for example:

The result of conditional merging is shown in Figure 4-d. In overlapping area 3, VC3 and VC4 still have 4 overlapping RRHs that do not meet the conditional merging. All satisfy the antenna ratio, so P10 is awarded to the virtual cell VC3 with a larger RSRP. In turn, P11 is awarded to the virtual cell VC3, P12 is awarded to the virtual cell VC4, and P13 is awarded to the virtual cell VC4. The offset result is shown in Figure 4-e. .

In order to solve the problem of high interference and sharing overhead between overlapping virtual cells, after merging virtual cells, it is necessary to use the hierarchical precoding technology to perform cell processing, as shown in Figure 3-b, including the following steps:

Step S8: Calculate the ZF precoding direction vector W in the virtual cell.

It should be noted that, in practical application, step S8 includes the following steps:

单数据流传输时，矢量W的第j列代表第j个用户在虚拟小区m内的预编码方向矢量W_j，第2(i-1)～2i-1行代表第i个RRH对第j个用户的预编码方向矢量W_i,j。Circulate each multi-user virtual cell, the base stations in each virtual cell share user data and complete channel state information H=SL, including the slowly changing large-scale channel matrix L and the fast-fading small-scale channel matrix S, the virtual cell ZF precoding is used to eliminate interference in the virtual cell, therefore, the user precoding direction vector

When a single data stream is transmitted, the jth column of the vector W represents the precoding direction vector W _j of the jth user in the virtual cell m, and the 2(i-1) to 2i-1 rows represent the ith RRH pair jth The precoding direction vector Wi _,j of each user.

Step S9, calculating the initial value D ⁰ of the power control factor.

It should be noted that, in actual application, step S9 includes the following steps:

其中

表示虚拟小区m内的所有U_m个用户，d_m,j表示虚拟小区m内第j个用户的功率对角因子。可以求解出功率控制因子的初始值：

The transmit power is limited according to each RRH:

in

represents all U _m users in the virtual cell m, and d _m,j represents the power diagonal factor of the jth user in the virtual cell m. The initial value of the power control factor can be solved for:

Step S10, iteratively obtain the optimal solution D of the power control factor.

It should be noted that, in an actual application, step S10 includes the following steps:

According to the large-scale channel matrix L shared by the RRHs between virtual cells, the optimization problem of solving the power diagonal vector to maximize the user rate of the whole network is formed:

为虚拟小区内多用户干扰和虚拟小区间同频干扰；σ_k ²为用户k的加性高斯白噪声。in,

σ _k ² is the additive white Gaussian noise of user k.

根据不等式

将问题转化为：when

According to the inequality

Transform the problem into:

式二；其中，

Formula 2; where,

迭代停止，D＝D^q。According to the initial D ⁰ , iteratively calculates g _m,k '(D|D ^q-1 ), q=1,2,..., and according to the above formula 2, Geometric Solver updates D ^q , when

The iteration stops, D ^=Dq .

Step S11, according to the known W and D, obtain the maximum user rate of the entire network, that is, the system throughput.

It should be noted that, in an actual application, step S11 includes the following steps:

The diagonal matrix D=D ^q is put into the above equation 1, and the user rate of the whole network is solved. So far, the user rate optimization solution of the whole network under the multi-user virtual cell is completed.

The method for merging virtual cells provided by the embodiment of the present invention obtains a preset virtual cell centered on a UE formed in a preset area, because multiple preset virtual cells centered on the UE may exist in the preset area at the same time. , at this time, there will be strong interference between the preset virtual cells; therefore, it is necessary to determine whether the first virtual cell and the second virtual cell overlap. When it is determined that the first virtual cell and the second virtual cell overlap, it is necessary to continue to determine Whether a virtual cell and a second virtual cell meet the merging conditions, and the first virtual cell and the second virtual cell that meet the merging conditions are merged into a multi-user virtual cell, so that the overlapping preset virtual cells are merged, so that the original virtual cell is merged. In some preset virtual cells, the strong interference is eliminated, and the combined virtual cells are optimized by using the hierarchical precoding algorithm, thereby improving the signal transmission rate between the RRH and the user, and improving the user rate of the entire network. It solves the problem that strong interference will occur between overlapping virtual cells in the prior art, which will reduce the rate of signal transmission between the RRH and the user; and because the same RRH may serve multiple users at the same time, the user rate of the entire network will be reduced. lower problem.

Embodiment 4, an embodiment of the present invention provides an apparatus 10 for combining virtual cells, as shown in FIG. 5 , including:

an area dividing unit 101, configured to divide an overlapping area consisting of at least two virtual cells in a preset area;

The processing unit 102 is configured to, when the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area divided by the area dividing unit 101 satisfy the merging condition, classify the first virtual cell Cell-1 that satisfies the merging condition in the overlapping area 1 and the second virtual cell Cell-2 are merged into a new virtual cell Mu-Cell.

The first virtual cell Cell-1 and the second virtual cell Cell-2 belong to one of at least two virtual cells Cell, respectively, and the first virtual cell Cell-1 and the second virtual cell Cell-2 are different, and the first virtual cell Cell-1 and the second virtual cell Cell-2 are different. The cell Cell-1 serves at least one first UE, the second virtual cell Cell-2 serves at least one second UE, the new virtual cell Mu-Cell serves at least one first UE, and at least To provide services for one second UE, the virtual cell Cell includes at least one remote radio head RRH.

The apparatus for combining virtual cells provided by the embodiment of the present invention divides the overlapping area of the virtual cells by an area dividing unit. Since multiple virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells and the virtual cells, Therefore, it is necessary to merge the first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging conditions in the overlapping area into a new virtual cell Mu-Cell by the processing unit, so that the virtual cells that meet the merging conditions are merged, The strong interference between the original virtual cells is eliminated, the signal transmission rate between the RRH and the user is improved, and the user rate of the entire network is improved, thereby solving the problem that the overlapping virtual cells in the prior art will cause strong interference. The interference reduces the rate of signal transmission between the RRH and the user; and the same RRH may serve multiple users at the same time, which leads to the problem of low rate of users in the entire network.

Embodiment 5, an embodiment of the present invention provides an apparatus 10 for combining virtual cells, as shown in FIG. 6 , including:

The data acquisition unit 103 is configured to acquire the RSRP value of the reference signal received power measured by the UE through the remote radio head RRH-1 in the preset area, wherein the remote radio head RRH-1 is any remote radio head in the preset area RRH;

The processing unit 102 is used to compare the size of the RSRP value and the RSRP threshold value obtained by the data acquisition unit 101;

The area dividing unit 101 is configured to re-divide the first remote radio head RRH to form a virtual cell Cell serving the UE when the processing unit 102 determines that the RSRP value ≥ the RSRP threshold value.

The area dividing unit 101 is further configured to divide an overlapping area composed of at least two virtual cells in the preset area;

The processing unit 102 is further configured to, when the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area divided by the area dividing unit 101 satisfy the merging condition, classify the first virtual cell Cell that satisfies the merging condition in the overlapping area -1 and the second virtual cell Cell-2 are merged into a new virtual cell Mu-Cell.

Preferably, the processing unit is specifically configured to compare the third virtual cell Cell-3 and the fourth virtual cell Cell-4 when the first virtual cell Cell-1 and the second virtual cell Cell-2 in the overlapping area do not meet the merging conditions Whether there is the same shared RRH; wherein, the third virtual cell Cell-3 and the fourth virtual cell Cell-4 belong to at least 2 virtual cells Cell, and one of the new virtual cells Mu-Cell, and the third virtual cell Cell-3 is different from the fourth virtual cell Cell-4.

Preferably, the processing unit is specifically configured to compare whether the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same A shared RRH, wherein the third virtual cell Cell-3 and the fourth virtual cell Cell-4 belong to at least 2 virtual cells Cell, and one of the new virtual cells Mu-Cell, and the third virtual cell Cell-3 Different from the fourth virtual cell Cell-4.

preferably,

a data acquisition unit, further configured to acquire the RRHs included in the third virtual cell Cell-3 in the overlapping area, and the RRHs included in the fourth virtual cell Cell-4;

a processing unit, specifically configured to compare whether the RRH included in the third virtual cell Cell-3 and the RRH included in the fourth virtual cell Cell-4 obtained by the data obtaining unit have the same shared RRH;

The area dividing unit is specifically configured to allocate the same shared RRH according to the RRH offset link when the processing unit compares that the third virtual cell Cell-3 and the fourth virtual cell Cell-4 have the same shared RRH.

Preferably, the processing unit is specifically configured to, when the third virtual cell Cell-3 and the fourth virtual cell Cell-4 do not have the same shared RRH, perform a precoding algorithm on the third virtual cell Cell-3 and the fourth virtual cell Cell-4 in the overlapping area according to the precoding algorithm. The fourth virtual cell Cell-4 performs optimization of the UE rate of the entire network.

Preferably, the processing unit is specifically configured to, after the area dividing unit allocates the same shared RRH according to the RRH offset link, divides the third virtual cell Cell-3 and the fourth virtual cell Cell-3 in the overlapping area according to the precoding algorithm. 4. Optimize the UE rate of the entire network.

The apparatus for combining virtual cells provided by the embodiment of the present invention divides the overlapping area of the virtual cells by an area dividing unit. Since multiple virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells and the virtual cells, Therefore, it is necessary to merge the first virtual cell Cell-1 and the second virtual cell Cell-2 that meet the merging conditions in the overlapping area into a new virtual cell Mu-Cell by the processing unit, so that the virtual cells that meet the merging conditions are merged, The strong interference between the original virtual cells is eliminated, the signal transmission rate between the RRH and the user is improved, and the user rate of the entire network is improved, thereby solving the problem that the overlapping virtual cells in the prior art will cause strong interference. The interference reduces the rate of signal transmission between the RRH and the user; and the same RRH may serve multiple users at the same time, which leads to the problem of low rate of users in the entire network.

Embodiment 6. An embodiment of the present invention provides a network system, as shown in FIG. 7-a and FIG. 7-b, including: UE, RRH, BBU, virtual cell combining device, MME, SGW, PGW, and IMS; wherein The combining device of the virtual cell belongs to the BBU.

It should be noted that, in practical applications, the baseband processing unit (full English name: Building Base band Unit, referred to as: BBU) in the base station (full name in English: Evolved Node B, referred to as: eNodeB) is connected to at least one remote radio head through optical fiber (full English name: Remote Radio Head, abbreviation: RRH), and the user equipment (full English name: UserEquipment, abbreviation: UE) can measure the reference signal received power (full English name: Received SignalCode Power, abbreviation: RSRP) through RRH and send To eNodeB, as the basis for eNodeB to provide services; base station through network node (English full name: Mobility Management Entity, abbreviation: MME), serving gateway (English full name: ServingGateWay, abbreviation: SGW), public data network gateway (English full name: Public Data Network GateWay, abbreviation: PGW) and network protocol multimedia subsystem (full English name: Internet Protocol Multimedia Subsystem, abbreviation: IMS) realize data exchange of users.

In the prior art, a communication cell under an eNodeB consists of multiple RRHs. After the UE enters the coverage of the communication cell, the eNodeB will allocate the RRH to serve the UE according to the RSRP value uploaded by the UE; The areas covered by the cells may overlap, resulting in strong interference between communication cells; since the device for combining virtual cells provided by the embodiments of the present invention belongs to the eNodeB, the RRH serving the UE under the eNodeB can be reallocated, so that the There is no boundary between the original communication cells, and the eNodeB will allocate RRHs to provide services for the UE according to the RSRP value uploaded by the UE, thereby improving the signal transmission rate between the RRH and the user, and solving the overlapping virtual reality in the prior art. There will be strong interference between cells, reducing the rate of signal transmission between the RRH and the user.

Exemplarily, as shown in FIG. 7-a, the RRHs allocated by the eNodeB to provide services for UE-1 include: RRH-1, RRH-2 and RRH-3, and the RRHs allocated by the eNodeB to provide services for UE-2 include: RRH- 4. RRH-5 and RRH-6; RRH-1, RRH-2 and RRH-3 form a virtual cell serving UE-1, and RRH-4, RRH-5 and RRH-6 form a virtual cell for UE-2 The virtual cell that provides services; since the areas covered by the virtual cell serving UE-1 and the virtual cell serving UE-2 overlap, the two virtual cells need to be merged; at this time, as shown in Figure 7-b The eNodeB shown will be re-divided into RRHs serving UE-1 and UE-2, and the re-allocated virtual cells include RRH-1, RRH-2, RRH-3, RRH-4, RRH-5 and RRH-6, And provide services for UE-1 and UE-2 at the same time.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (21)

1. A method for combining virtual cells, comprising:

dividing an overlapping area consisting of at least 2 virtual Cell cells in a preset area;

when a first virtual Cell-1 and a second virtual Cell-2 in the overlapping area meet a merging condition, merging the first virtual Cell-1 and the second virtual Cell-2 meeting the merging condition in the overlapping area into a new virtual Cell Mu-Cell;

wherein, the first virtual Cell-1 and the second virtual Cell-2 belong to one of the at least 2 virtual Cell cells respectively, and the first virtual Cell-1 and the second virtual Cell-2 are different, the first virtual Cell-1 serves at least 1 first UE, the second virtual Cell-2 serves at least 1 second UE, the new virtual Cell Mu-Cell serves at least 1 first UE and at least 1 second UE, and the virtual Cell at least includes a radio remote head RRH;

the merging conditions include: the area covered by the first virtual Cell-1 and the area covered by the second virtual Cell-2 satisfy a first preset merging condition, the total number of UEs of the first virtual Cell-1 and the total number of UEs of the second virtual Cell-2 satisfy a second preset merging condition, and the first virtual Cell-1 and the second virtual Cell-2 satisfy a third preset merging condition;

the merging the first virtual Cell-1 and the second virtual Cell-2 satisfying the merging condition in the overlapping area into a new virtual Cell Mu-Cell includes:

when the area covered by the first virtual Cell-1 and the area covered by the second virtual Cell-2 satisfy the first preset merging condition, the total number of UEs of the first virtual Cell-1 and the total number of UEs of the second virtual Cell-2 satisfy a second preset merging condition, and the first virtual Cell-1 and the second virtual Cell-2 satisfy the third preset merging condition, merging the first virtual Cell-1 and the second virtual Cell-2 in an overlapping area into a new virtual Cell Mu-Cell.

2. The method according to claim 1, wherein before dividing the overlapping area of at least 2 cells in the preset area, the method further comprises:

acquiring a Reference Signal Received Power (RSRP) value measured by UE through a remote radio head (RRH-1) in a preset area, wherein the remote radio head (RRH-1) is any Remote Radio Head (RRH) in the preset area;

comparing the RSRP value with an RSRP threshold value;

and when the RSRP value is larger than or equal to the RSRP threshold value, the RRH-1 is divided again to form a virtual Cell served by the UE.

3. The method for combining virtual cells according to claim 1, wherein the first preset combining condition comprises:

the number of RRHs shared by the first virtual Cell-1 and the second virtual Cell-2 is greater than 0.

4. The method for combining virtual cells according to claim 1, wherein the second preset combining condition comprises:

the total number of the UE of the first virtual cell is less than or equal to a first preset user threshold value, and the total number of the UE of the second virtual cell is less than or equal to a second preset user threshold value.

5. The method for combining virtual cells according to claim 1, wherein the third preset combining condition comprises: the ratio of the total number of antennas of the RRHs of the first virtual cell to the total number of antennas of the UE of the first virtual cell is greater than or equal to 1, and the ratio of the total number of antennas of the RRHs of the second virtual cell to the total number of antennas of the UE of the second virtual cell is greater than or equal to 1.

6. The method according to claim 3, wherein the merging the first virtual Cell-1 and the second virtual Cell-2 satisfying the merging condition in the overlapping area into a new virtual Cell Mu-Cell comprises:

acquiring the number of RRHs shared by different first virtual cells Cell-1 and different second virtual cells Cell-2 in the overlapping area;

sorting the number of RRHs shared by the first virtual Cell Cell-1 and the second virtual Cell Cell-2 in the overlapping area in descending order;

and merging the first virtual Cell-1 and the second virtual Cell-2 into a new virtual Cell Mu-Cell according to the sequence of the number of RRHs shared by the first virtual Cell-1 and the second virtual Cell-2.

7. The method according to claim 1, wherein after the merging the first virtual Cell-1 and the second virtual Cell-2 satisfying the merging condition in the overlapping area into a new virtual Cell Mu-Cell, the method further comprises:

when a third virtual Cell-3 and a fourth virtual Cell-4 do not satisfy a merging condition, comparing whether the third virtual Cell-3 and the fourth virtual Cell-4 have the same shared RRH, wherein the third virtual Cell-3 and the fourth virtual Cell-4 belong to the at least 2 virtual Cell cells and one of the new virtual Cell Mu-cells, and the third virtual Cell-3 and the fourth virtual Cell-4 are different.

8. The method of claim 7, wherein the comparing whether the third virtual Cell-3 and the fourth virtual Cell-4 have the same common RRH comprises:

acquiring an RRH contained in the third virtual Cell-3 and an RRH contained in the fourth virtual Cell-4 in the overlapping area;

comparing whether the RRH contained in the third virtual Cell-3 and the RRH contained in the fourth virtual Cell-4 have the same shared RRH;

and when the third virtual Cell-3 and the fourth virtual Cell-4 have the same shared RRH, allocating the same shared RRH according to an RRH offset link.

9. The method of combining virtual cells according to claim 8, wherein the RRH biasing procedure comprises:

when the third virtual Cell-3 removes the same shared RRH, the ratio of the total number of the RRHs of the third virtual Cell-3 to the total number of the antennas of the UE of the third virtual Cell-3 is greater than or equal to 1, and the fourth virtual Cell-4 removes the same shared RRH, the ratio of the total number of the antennas of the RRHs of the fourth virtual Cell-4 to the total number of the antennas of the UE of the fourth virtual Cell-4 is greater than or equal to 1, and when the sum of the RSRP values of the third virtual Cell-3 is greater than the sum of the RSRP values of the fourth virtual Cell-4, the same shared RRH is merged to the third virtual Cell-3; or

And when the sum of the RSRP values of the third virtual Cell-3 is smaller than the sum of the RSRP values of the fourth virtual Cell-4, merging the same shared RRH into the fourth virtual Cell-4.

10. The method of combining virtual cells according to claim 8, wherein the RRH biasing procedure comprises:

when the same shared RRH is removed from the third virtual Cell-3, the ratio of the total number of the antennas of the RRH of the third virtual Cell-3 to the total number of the antennas of the UE of the third virtual Cell-3 is greater than or equal to 1, and after the same shared RRH is removed from the fourth virtual Cell-4, the ratio of the total number of the antennas of the RRH of the fourth virtual Cell-4 to the total number of the antennas of the UE of the fourth virtual Cell-4 is less than 1, and the same shared RRH is merged into the fourth virtual Cell-4;

or

Determining that the ratio of the total number of the antennas of the RRHs of the third virtual Cell-3 to the total number of the antennas of the UE of the third virtual Cell-3 is less than 1 after the same shared RRH is removed from the third virtual Cell-3, and determining that the ratio of the total number of the antennas of the RRHs of the fourth virtual Cell-4 to the total number of the antennas of the UE of the fourth virtual Cell-4 is greater than or equal to 1 after the same shared RRH is removed from the fourth virtual Cell-4, and merging the same shared RRH into the third virtual Cell-3.

11. The method of combining virtual cells according to claim 8, wherein the RRH biasing procedure comprises:

acquiring an RSRP value measured by UE in the third virtual Cell-3 through silent RRH;

acquiring an RSRP value measured by the UE in the fourth virtual Cell-4 through the silent RRH, wherein the silent RRH comprises: RRHs in the overlapping area that are not selected by the third virtual Cell Cell-3 and the fourth virtual Cell Cell-4;

when the third virtual Cell-3 removes the same common RRH, the ratio of the total number of RRHs in the third virtual Cell-3 to the total number of antennas in the UE in the third virtual Cell-3 is less than 1, and after the same common RRH is removed in the fourth virtual Cell-4, the ratio of the total number of RRHs of the fourth virtual Cell-4 to the total number of antennas of the UE of the fourth virtual Cell-4 is less than 1, and the sum of RSRP values measured by silent RRHs by all UEs in the third virtual Cell-3 is greater than or equal to the sum of RSRP values measured by silent RRHs by all UEs in the fourth virtual Cell-4, merging the silent RRHs with the largest reference value of the RSRP values to the third virtual Cell-3, and merging the same common RRH to the fourth virtual Cell-4;

or

When the sum of the RSRP values measured by the silent RRHs of all the UEs in the third virtual Cell-3 is smaller than the sum of the RSRP values measured by the silent RRHs of all the UEs in the fourth virtual Cell-4, the silent RRHs with the largest reference values of the RSRP values are merged to the fourth virtual Cell-4, and the same common RRH is merged to the third virtual Cell-3.

12. The method for combining virtual cells according to claim 7, further comprising:

and when the third virtual Cell-3 and the fourth virtual Cell-4 do not have the same shared RRH, optimizing the UE rate of the whole network for the third virtual Cell-3 and the fourth virtual Cell-4 in the overlapping area according to a precoding algorithm.

13. The method for combining virtual cells according to claim 8, further comprising:

and optimizing the UE rate of the whole network for the third virtual Cell Cell-3 and the fourth virtual Cell Cell-4 in the overlapping area according to a pre-coding algorithm.

14. The method for merging virtual cells according to claim 12 or 13, wherein the optimizing the UE rate of the whole network for the third virtual Cell-3 and the fourth virtual Cell-4 in the overlapping area according to the precoding algorithm comprises:

acquiring a precoding direction vector W of the UE in a first multi-user virtual cell;

obtaining an initial value D of a power control factor of any UE in the first multi-user virtual cell⁰；

Acquiring a shared channel matrix L of the RRH of the first multi-user virtual cell and the RRH of the second multi-user virtual cell;

constructing a first calculation formula, a second calculation formula and a third calculation formula of the power diagonal vector maximization full-network user rate according to the shared channel matrix L of the RRH of the first multi-user virtual cell and the RRH of the second multi-user virtual cell;

setting an initial value D of the power control factor⁰Substituting the optimal solution D of the power control factor into the third calculation formula for iterative solution;

substituting the optimal solution D of the power control factor into the second calculation formula, and solving D through geometric programming^qWherein, when

Then, the iteration is stopped, and the diagonal matrix D is obtained as D^q；

Converting the diagonal matrix D ═ D^qSubstituting the first calculation formula to obtain the maximum user rate of the whole network; wherein the first calculation formula includes:

wherein, J_KRepresenting multi-user interference within the first multi-user virtual cell and co-channel interference, σ, between the first multi-user virtual cells_k ²Additive white gaussian noise for user k;

the second calculation formula includes:

wherein,

the third calculation formula includes:

g_m,k'(D|D^q-1) Q is an integer of 1 or more;

wherein,

is the initial value of the power control factor; d^qFor the current value of the power control factor in the iterative algorithm, D^q-1Is the value of the power control factor in the iterative algorithm at the previous iteration time, R (D)^q) For controlling the factor D^qThe total rate of users; epsilon is an error value set by the system, and the rate convergence of the user is judged;

the channel vectors of the user k in the multi-user virtual cell m comprise large-scale channel vectors and small-scale channel vectors;

normalizing the precoding vector of the user k in the multi-user virtual cell m;

a large scale channel vector for user k within the multi-user virtual cell t.

15. An apparatus for combining virtual cells, comprising:

the area dividing unit is used for dividing an overlapping area consisting of at least 2 virtual Cell cells in a preset area;

a processing unit, configured to, when a first virtual Cell-1 and a second virtual Cell-2 in the overlapping area divided by the area dividing unit satisfy a merging condition, merge the first virtual Cell-1 and the second virtual Cell-2 that satisfy the merging condition in the overlapping area into a new virtual Cell Mu-Cell;

wherein, the first virtual Cell-1 and the second virtual Cell-2 belong to one of the at least 2 virtual Cell cells respectively, and the first virtual Cell-1 and the second virtual Cell-2 are different, the first virtual Cell-1 serves at least 1 first UE, the second virtual Cell-2 serves at least 1 second UE, the new virtual Cell Mu-Cell serves at least 1 first UE and at least 1 second UE, and the virtual Cell at least includes a radio remote head RRH;

the merging conditions include: the area covered by the first virtual Cell-1 and the area covered by the second virtual Cell-2 satisfy a first preset merging condition, the total number of UEs of the first virtual Cell-1 and the total number of UEs of the second virtual Cell-2 satisfy a second preset merging condition, and the first virtual Cell-1 and the second virtual Cell-2 satisfy a third preset merging condition;

the merging the first virtual Cell-1 and the second virtual Cell-2 satisfying the merging condition in the overlapping area into a new virtual Cell Mu-Cell includes:

when the area covered by the first virtual Cell-1 and the area covered by the second virtual Cell-2 satisfy the first preset merging condition, the total number of UEs of the first virtual Cell-1 and the total number of UEs of the second virtual Cell-2 satisfy a second preset merging condition, and the first virtual Cell-1 and the second virtual Cell-2 satisfy the third preset merging condition, merging the first virtual Cell-1 and the second virtual Cell-2 in an overlapping area into a new virtual Cell Mu-Cell.

16. The apparatus for merging virtual cells according to claim 15, wherein the apparatus further comprises: a data acquisition unit;

the data acquisition unit is used for acquiring a Reference Signal Received Power (RSRP) value measured by the UE through a remote radio head (RRH-1) in a preset area, wherein the remote radio head (RRH-1) is any Remote Radio Head (RRH) in the preset area;

the processing unit is specifically configured to compare the RSRP value acquired by the data acquisition unit with an RSRP threshold value;

the area dividing unit is specifically configured to, when the processing unit determines that the RSRP value is greater than or equal to the RSRP threshold value, re-divide the remote radio head RRH-1 to form a virtual Cell served by the UE.

17. The apparatus according to claim 16, wherein the processing unit is configured to compare whether a third virtual Cell-3 and a fourth virtual Cell-4 have the same common RRH when the third virtual Cell-3 and the fourth virtual Cell-4 do not satisfy a combining condition, where the third virtual Cell-3 and the fourth virtual Cell-4 belong to the at least 2 virtual cells Cell and one of the new virtual cells Mu-cells, and the third virtual Cell-3 and the fourth virtual Cell-4 are different.

18. The virtual cell merging apparatus of claim 17,

the data acquisition unit is further configured to acquire an RRH included in the third virtual Cell-3 and an RRH included in the fourth virtual Cell-4 in the overlapping area;

the processing unit is specifically configured to compare whether the RRH included in the third virtual Cell-3 and the RRH included in the fourth virtual Cell-4 acquired by the data acquisition unit have the same common RRH;

the area dividing unit is specifically configured to, when the processing unit compares that the third virtual Cell-3 and the fourth virtual Cell-4 have the same shared RRH, allocate the same shared RRH according to an RRH offset link.

19. The apparatus for merging virtual cells according to claim 17, wherein the processing unit is specifically configured to perform full-network UE rate optimization on the third virtual Cell-3 and the fourth virtual Cell-4 in the overlapping area according to a precoding algorithm when the third virtual Cell-3 and the fourth virtual Cell-4 do not have the same common RRH.

20. The apparatus for merging virtual cells according to claim 18, wherein the processing unit is specifically configured to, after the area dividing unit allocates the same common RRH according to an RRH offset link, optimize the overall UE rate for the third virtual Cell-3 and the fourth virtual Cell-4 in the overlapping area according to a precoding algorithm.

21. A network system, comprising: UE, RRH, BBU, merging device of virtual cell, MME, SGW, PGW and IMS; wherein the merging means of the virtual cell belongs to the BBU.

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