CN108810907B

CN108810907B - Virtual cell merging method, device and network system

Info

Publication number: CN108810907B
Application number: CN201710284143.3A
Authority: CN
Inventors: 刘珊; 刘琪; 陈露; 夏海轮; 陈祎
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2017-04-26
Filing date: 2017-04-26
Publication date: 2021-12-07
Anticipated expiration: 2037-04-26
Also published as: CN108810907A

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

Virtual cell merging method, device and network system

Technical Field

The present invention relates to the field of network communication technologies, and in particular, to a method, an apparatus, and a network system for merging virtual cells.

Background

For the data traffic demand which is thousands of times increased in 2020 and the future, a fifth Generation mobile communication technology (5 th-Generation, for short: 5G) system is constructed on a technical system which takes a large-scale antenna, an ultra-dense networking and a full-spectrum access as a core; in a hotspot high-capacity scene, the system capacity is improved by increasing the number of low-power nodes, so that the density of the low-power nodes can reach ten times or even higher than the current deployment density of base stations, thereby forming an ultra-dense network.

In order to reduce the interference among communication cells under the ultra-dense deployment network, the problem can be solved by a user-centered virtualized cell technology; the Virtual Cell technology is used for breaking the boundary limit of a Virtual Cell, providing wireless access without boundary, establishing coverage around a user, providing service, and rapidly updating the Virtual Cell along with the movement of the user and the network condition; by forming the virtual cell, the edge user can be eliminated, and simultaneously, better link Quality between the virtual cell and the terminal is ensured all the time, so that the user can obtain consistent high Service Quality (Quality of Service, QoS for short) and Quality of Experience (QoE for short) no matter how the user moves in the ultra-dense deployment area; user-centric virtualized cell technologies are therefore gaining increasing attention.

However, in the research on the technology of the virtualized cell centered on the user, it is found that different users in an ultra-dense set or Cloud Radio Access Network (hereinafter, referred to as C-RAN) may select one or more identical Remote Radio Heads (RRH), which may cause overlapping of virtual cells, and strong interference may be generated between the overlapping virtual cells, so that the rate of signal transmission between the RRH and the user is reduced, resulting in a lower user rate in the entire Network.

As can be seen from the above, in the prior art, strong interference will be generated between the overlapping virtual cells, so that the rate of signal transmission between the RRH and the user is reduced, resulting in a lower user rate in the whole network.

Disclosure of Invention

Embodiments of the present invention provide a method, an apparatus, and a network system for merging virtual cells, which solve the problem in the prior art that strong interference will be generated between overlapping virtual cells, so that the rate of signal transmission between an RRH and a user is reduced, resulting in a low user rate of the entire network.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

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 Cell cells in a preset area;

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 first virtual Cell-1 and the second virtual Cell-2 belong to one of at least 2 virtual Cell cells respectively, 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 comprises a radio remote head RRH.

Preferably, before determining an overlapping area composed of at least 2 virtual Cell cells in the preset area, the method further includes:

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 the RSRP threshold value;

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

Preferably, the combining conditions include:

the area covered by the first virtual Cell-1 and the area covered by the second virtual Cell-2 meet a first preset merging condition, the total number of the UE of the first virtual Cell-1 and the total number of the UE of the second virtual Cell-2 meet a second preset merging condition, and the first virtual Cell-1 and the second virtual Cell-2 meet a third preset merging condition;

merging a first virtual Cell-1 and a second virtual Cell-2 which meet a merging condition in an overlapping area into a new virtual Cell Mu-Cell, comprising:

and when the area covered by the first virtual Cell-1 and the area covered by the second virtual Cell-2 meet a first preset condition, the total number of the UE of the first virtual Cell-1 and the total number of the UE of the second virtual Cell-2 meet a second preset merging condition, and the first virtual Cell-1 and the second virtual Cell-2 meet a third preset merging condition, merging the first virtual Cell-1 and the second virtual Cell-2 in the overlapped area into a new virtual Cell Mu-Cell.

Preferably, the first preset merging condition includes:

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

Preferably, the second preset combining condition includes:

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.

Preferably, the third preset combining condition includes: the ratio of the total number of 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 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.

Preferably, 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:

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

sequencing the RRH numbers shared by a first virtual Cell-1 and a second virtual Cell-2 in an overlapping area from large to small;

and combining 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.

Preferably, the method further comprises:

when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area do not meet the merging condition, comparing whether a third virtual Cell-3 and a fourth virtual Cell-4 have the same shared RRH; wherein the third virtual Cell-3 and the fourth virtual Cell-4 belong to 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.

Preferably, after the first virtual Cell-1 and the second virtual Cell-2 satisfying the merging condition in the overlapping area are merged into a new virtual Cell Mu-Cell, the method further includes:

and when the third virtual Cell-3 and the fourth virtual Cell-4 do not meet the 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 at least 2 virtual Cell cells and one of new virtual Cell Mu-cells, and the third virtual Cell-3 and the fourth virtual Cell-4 are different.

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

acquiring an RRH contained in a third virtual Cell-3 and an RRH contained in a fourth virtual Cell-4 in an 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, distributing the same shared RRH according to an RRH offset link.

Preferably, the RRH bias link includes:

when the third virtual Cell-3 removes the same common RRH, the ratio of the total number of the RRHs of the third virtual Cell-3 to the total number 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 common RRH, the ratio of the total number of the RRHs of the fourth virtual Cell-4 to the total number 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 common 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, the same shared RRH is merged into the fourth virtual Cell-4.

Preferably, the RRH bias link includes:

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

or

After the third virtual Cell-3 is determined to remove the same common RRH, the ratio of the total number of the RRHs of the third virtual Cell-3 to the total number of the UE of the third virtual Cell-3 is smaller than 1, and after the fourth virtual Cell-4 removes the same common RRH, the ratio of the total number of the RRHs of the fourth virtual Cell-4 to the total number of the UE of the fourth virtual Cell-4 is greater than or equal to 1, and the same common RRH is merged into the third virtual Cell-3.

Preferably, the RRH bias link includes:

acquiring an RSRP value measured by UE (user equipment) in a third virtual Cell-3 through silent RRH (remote radio resource management);

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

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

Preferably, the method further comprises:

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

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

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 precoding algorithm.

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

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

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

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

initial value D of power control factor⁰The optimal solution D of the power control factor is iteratively solved by being substituted into a third calculation formula;

the optimal solution D of the power control factor is substituted into a second calculation formula, and the geometric programming is used for solving the optimal solution D^qWherein, when

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

Converting the diagonal matrix D to D^qSubstituting a 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 a 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 content of the first and second substances,

the third calculation formula includes:

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

wherein the content of the first and second substances,

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 of the power control factor in the iterative algorithm at the previous iteration moment, and R (Dq) is the total user rate under the power control factor Dq; epsilon is an error value set by the system, and the rate convergence of the user is judged;

a channel vector (comprising a large-scale channel vector and a small-scale channel vector) in a multi-user virtual cell m for a user k;

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.

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

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

the processing unit is used for merging the first virtual Cell-1 and the second virtual Cell-2 which meet the merging condition in the overlapping area into a new virtual Cell Mu-Cell when the first virtual Cell-1 and the second virtual Cell-2 meet the merging condition in the overlapping area divided by the area dividing unit;

Preferably, 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 used for comparing the RSRP value acquired by the data acquisition unit with the RSRP threshold value;

and the area dividing unit is specifically used for re-dividing the first RRH to form a virtual Cell served by the UE when the processing unit determines that the RSRP value is larger than or equal to the RSRP threshold value.

Preferably, the processing unit is specifically configured to compare whether the third virtual Cell-3 and the fourth virtual Cell-4 have the same shared RRH when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area do not satisfy the merging condition; wherein the third virtual Cell-3 and the fourth virtual Cell-4 belong to 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.

Preferably, the processing unit is specifically configured to compare whether the third virtual Cell-3 and the fourth virtual Cell-4 have the same shared RRH when the third virtual Cell-3 and the fourth virtual Cell-4 do not satisfy the merging condition, where the third virtual Cell-3 and the fourth virtual Cell-4 belong to at least 2 virtual cells and one of the new virtual cells Mu-cells, and the third virtual Cell-3 and the fourth virtual Cell-4 are different.

Preferably, the first and second liquid crystal materials are,

the data acquisition unit is further used for acquiring RRH contained in a third virtual Cell-3 and RRH contained in a 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 shared RRH;

and the area dividing unit is specifically used for allocating the same shared RRH according to an 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-3 and the fourth virtual Cell-4 do not have the same common RRH, optimize the overall network UE rate for the third virtual Cell-3 and the fourth virtual Cell-4 in the overlapping area according to a precoding algorithm.

Preferably, the processing unit is specifically configured to, after the area dividing unit allocates the same common RRH according to the RRH offset link, optimize the overall network UE rate for the third virtual Cell-3 and the fourth virtual Cell-4 in the overlapping area according to a precoding algorithm.

A third aspect and an embodiment of the present invention provide a network system, including: 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.

According to the method, the device and the network system for merging the virtual cells, provided by the embodiment of the invention, by dividing the overlapping area of the virtual cells, as a plurality of virtual cells may exist in the overlapping area at the same time and strong interference may be formed between the virtual cells, the first virtual Cell Cel-1 and the second virtual Cell Cell-2 which satisfy the merging condition in the overlapping area need to be merged into a new virtual Cell Mu-Cell, so that the virtual cells which satisfy the merging condition are merged, the strong interference between the original virtual cells is eliminated, the signal transmission rate between an RRH and a user is increased, the user rate of the whole network is increased, the problem that the strong interference is generated between the overlapped virtual cells in the prior art is solved, and the signal transmission rate between the RRH and the user is reduced; and because the same RRH can simultaneously serve a plurality of users, the problem of low user rate of the whole network is caused.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

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

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

fig. 3-a and fig. 3-b are logic flow diagrams of a method for merging virtual cells according to an embodiment of the present invention;

fig. 4-a-fig. 4-e are schematic diagrams illustrating that the virtual cell combining method provided by the present invention is used to combine virtual cells in practical applications;

fig. 5 is a schematic structural diagram of a merging device of virtual cells according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an apparatus for merging virtual cells according to an embodiment of the present invention;

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

Reference numerals:

merging means-10 of virtual cells;

a region dividing unit-101;

a processing unit-102;

a data acquisition unit-103.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical solutions provided in the embodiments of the present invention are essentially or partially contributed to by the prior art, or all or part of the technical solutions may be implemented by software programs, hardware, firmware, or any combination thereof. When implemented using a software program, may 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 loaded and executed on a computer, cause the flow or functions according to embodiments of the invention, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy disk, magnetic tape), an optical medium (e.g., Digital Video Disk (DVD)), or a semiconductor medium (e.g., Solid State Drive (SSD)), among others.

A first embodiment of the present invention provides a method for combining virtual cells, as shown in fig. 1, including:

s101, dividing an overlapping area formed by at least 2 virtual Cell cells in a preset area.

S102, when the first virtual Cell Cell-1 and the second virtual Cell Cell-2 in the overlapping area meet the merging condition, merging the first virtual Cell Cell-1 and the second virtual Cell Cell-2 meeting the merging condition in the overlapping area into a new virtual Cell Mu-Cell.

The first virtual Cell-1 and the second virtual Cell-2 belong to one of at least 2 virtual cells Cel respectively, 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 comprises a radio remote head RRH.

According to the virtual Cell merging method provided by the embodiment of the invention, by dividing the overlapping area of the virtual cells, as a plurality of virtual cells may exist in the overlapping area at the same time and strong interference may be formed between the virtual cells, the first virtual Cell Cel-1 and the second virtual Cell Cel-2 which meet the merging condition in the overlapping area need to be merged into a new virtual Cell Mu-Cell, so that the virtual cells which meet the merging condition are merged, the strong interference between the original virtual cells is eliminated, the signal transmission rate between an RRH and a user is increased, the user rate of the whole network is increased, and the problems that strong interference is generated between the overlapped virtual cells in the prior art and the signal transmission rate between the RRH and the user is reduced are solved; and because the same RRH can simultaneously serve a plurality of users, the problem of low user rate of the whole network is caused.

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

scenario one, an embodiment of the present invention provides a method for combining virtual cells, as shown in fig. 2-a, including:

s1010, obtaining 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.

And S1020, comparing the RSRP value with the RSRP threshold value.

It should be noted that the RSRP threshold refers to a minimum RSRP set by the UE; illustratively, the RSRP threshold value is-130 dBm, and the RSRP value measured by the UE through the RRH-a is-100 dBm, where the measured RSRP value-100 dBm is greater than the RSRP threshold value-130 dBm, so that the RRH-a can be used as an RRH for serving the UE; if the RSRP value measured by the UE through the RRH-b is smaller than the RSRP threshold value, the signal received by the UE through the RRH-b cannot be demodulated at the moment, so the RRH-b cannot be used as the RRH for providing service for the UE.

And S1030, when the RSRP value is larger than or equal to the RSRP threshold value, the first RRH is divided again to form a virtual Cell served by the UE.

And S1040, dividing an overlapping area formed by at least 2 virtual Cell cells in the preset area.

S1050, when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area do not meet the 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 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.

Preferably, the combining conditions include:

Preferably, the first preset merging condition includes:

Preferably, the second preset combining condition includes:

In practical applications, the first preset user threshold and the second preset user threshold may be the same or different.

S1060, 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.

According to the virtual Cell merging method provided by the embodiment of the invention, by dividing the overlapping area of the virtual cells, as a plurality of virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells, when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area do not satisfy the merging condition, and at this time, a situation that the two virtual cells overlap because the merging condition is not satisfied exists in the overlapping area, it is necessary to compare whether the third virtual Cell-3 and the fourth virtual Cell-4 have the same shared RRH, and when the third virtual Cell-3 and the fourth virtual Cell-4 do not have the same shared RRH, in order to improve the internet access rate of the UE to the optimum; therefore, the combined virtual cells need to be optimized according to the precoding algorithm, so that the rate of signal transmission between the RRH and the user is increased, the user rate of the whole network is increased, and the problem that strong interference is generated between the overlapped virtual cells in the prior art, so that the rate of signal transmission between the RRH and the user is reduced is solved.

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

s1011, obtaining 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.

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

firstly, the UE measures the RSRP value of the reference signal received power through a radio remote head RRH-1 in a preset area, wherein the UE measures all the RSRP values and then compares the RSRP value with the RSRP threshold value, so that the RSRP value of each RRH can be measured in detail, and the RRH is more conveniently distributed to the UE.

And secondly, setting an RSRP reference value, and when the UE has a plurality of RRH selections, sequencing according to the RRH signals, and finding out the RRH with the RSRP value being larger than or equal to the RSRP threshold value, so that the time for the UE to measure the RSRP value through the RRH is shortened.

And S1021, comparing the RSRP value with the RSRP threshold value.

And S1031, when the RSRP value is larger than or equal to the RSRP threshold value, re-dividing the first RRH to form a virtual Cell served by the UE.

And S1041, dividing an overlapping area consisting of at least 2 virtual Cell cells in the preset area.

S1051, when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area do not meet the 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 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.

And S1061, 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.

S1071, 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.

According to the virtual Cell merging method provided by the embodiment of the invention, by dividing the overlapping area of the virtual cells, as a plurality of virtual cells may exist in the overlapping area at the same time, and strong interference may be formed between the virtual cells, when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area do not satisfy the merging condition, and at this time, the situation that the two virtual cells overlap because the merging condition is not satisfied exists in the overlapping area, it is necessary to compare whether the third virtual Cell-3 and 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, the overlapped RRHs need to be reallocated according to an RRH offset link; in order to improve the internet access rate of the UE which is distributed with the virtual cell to the optimum; therefore, the combined virtual cells need to be optimized according to the precoding algorithm, so that the rate of signal transmission between the RRH and the user is increased, the user rate of the whole network is increased, and the problem that strong interference is generated between the overlapped virtual cells in the prior art, so that the rate of signal transmission between the RRH and the user is reduced is solved.

Scenario three, an embodiment of the present invention provides a method for combining virtual cells, as shown in fig. 2-c, including:

s1012, 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.

And S1022, comparing the RSRP value with the RSRP threshold value.

S1032, when the RSRP value is larger than or equal to the RSRP threshold value, the first RRH is divided again to form a virtual Cell served by the UE.

And S1042, dividing an overlapping area formed by at least 2 virtual Cell cells in the preset area.

S1052, 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.

It should be noted that, in practical application, the first virtual Cell-1 and the second virtual Cell-2 need to be repeatedly merged, and after a new virtual Cell Mu-Cell is formed, the new virtual Cell Mu-Cell is used as the first virtual Cell-1 or the second virtual Cell-2 to be continuously merged until the merging condition is not satisfied between the first virtual Cell-1 and the second virtual Cell-2.

And S1062, 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.

Preferably, the RRH bias link includes:

or

Preferably, the RRH bias link includes:

or

Preferably, the RRH bias link includes:

or

S1072, 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 pre-coding algorithm.

According to the virtual Cell merging method provided by the embodiment of the invention, by dividing the overlapping area of the virtual cells, as a plurality of virtual cells may exist in the overlapping area at the same time and strong interference may be formed between the virtual cells, the first virtual Cell Cel-1 and the second virtual Cell Cel-2 which meet the merging condition in the overlapping area are merged into a new virtual Cell Mu-Cell; at this time, the situation that two virtual cells overlap due to the fact that the merging condition is not met may exist in the overlapping area, so that it is necessary to compare whether the third virtual Cell-3 and 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, the overlapping RRHs need to be reallocated according to an RRH offset link; in order to improve the internet access rate of the UE which is distributed with the virtual cell to the optimum; therefore, the combined virtual cells need to be optimized according to the precoding algorithm, so that the rate of signal transmission between the RRH and the user is increased, the user rate of the whole network is increased, and the problem that strong interference is generated between the overlapped virtual cells in the prior art, so that the rate of signal transmission between the RRH and the user is reduced is solved.

Scenario four, an embodiment of the present invention provides a method for combining virtual cells, as shown in fig. 2-d, including:

s1013, a Reference Signal Received Power (RSRP) value measured by the UE through the remote radio head RRH-1 in the preset area is obtained, wherein the remote radio head RRH-1 is any remote radio head RRH in the preset area.

And S1023, comparing the RSRP value with the RSRP threshold value.

S1033, when the RSRP value is larger than or equal to the RSRP threshold value, the first RRH is divided again to form a virtual Cell served by the UE.

And S1043, dividing an overlapping area consisting of at least 2 virtual Cell cells in the preset area.

S1053, when the first virtual Cell Cell-1 and the second virtual Cell Cell-2 in the overlapping area meet the merging condition, merging the first virtual Cell Cell-1 and the second virtual Cell Cell-2 meeting the merging condition in the overlapping area into a new virtual Cell Mu-Cell.

S1063, 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.

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

the second calculation formula includes:

wherein the content of the first and second substances,

the third calculation formula includes:

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

wherein the content of the first and second substances,

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;

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

According to the virtual Cell merging method provided by the embodiment of the invention, by dividing the overlapping area of the virtual cells, as a plurality of virtual cells may exist in the overlapping area at the same time and strong interference may be formed between the virtual cells, the first virtual Cell Cel-1 and the second virtual Cell Cel-2 which meet the merging condition in the overlapping area are merged into a new virtual Cell Mu-Cell; at this time, a situation that two virtual cells overlap due to the fact that merging conditions are not met may exist in the overlapping area, so that whether the third virtual Cell-3 and the fourth virtual Cell-4 have the same shared RRH or not needs to be compared, when the third virtual Cell-3 and the fourth virtual Cell-4 do not have the same shared RRH, the situation that each virtual Cell in the overlapping area does not overlap is explained, and in order to improve the internet access rate of the UE which has distributed the virtual cells to be optimal; therefore, the combined virtual cells need to be optimized according to the precoding algorithm, so that the rate of signal transmission between the RRH and the user is increased, the user rate of the whole network is increased, and the problem that strong interference is generated between the overlapped virtual cells in the prior art, so that the rate of signal transmission between the RRH and the user is reduced is solved.

Third embodiment, an embodiment of the present invention provides an implementation manner of a virtual cell merging method in practical application, and as shown in fig. 3-a, fig. 3-b, and fig. 4-a-fig. 4-e, the implementation manner includes:

it should be noted that the third embodiment aims to provide a virtual cell merging method, which is applied to the co-frequency condition of a super-dense C-RAN downlink multi-antenna RRH (in the third embodiment, the RRH employs 2 transmitting antennas and a single user antenna), and solves the problem that the inter-virtual-cell interference is converted into multi-user interference in a virtual cell under the condition of uniform frequency reuse, and the average user spectrum efficiency and the overall network user rate are improved by combining a layered precoding algorithm.

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

In practical applications, step S1 includes the following steps:

step S11, setting RSRP threshold according to the principle of reference signal received power RSRP maximum, and selecting RRH with the maximum RSRP difference value of the user within the threshold to form a virtual cell with the user as the center;

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

and step S13, silencing RRHs which are not selected into the virtual cell by the user in the whole network.

For example, the following steps are carried out:

as shown in fig. 4-a, according to the maximum RSRP principle, 15 users sequentially select strong-proximity signals RRH to form a virtual cell with the user as the center, and the user serial number is the virtual cell number, i.e. the user U1 forms a virtual cell VC1, which is served by RRH-P3, RRH-P5 and RRH-P6, and the other virtual cells are sequentially shown in the figure; and finally, silencing RRH-P1, RRH-P2, RRH-P7, RRH-P7 and RRH-15 which are not selected into the virtual cell.

And step S2, counting the number of overlapped RRHs between the virtual cells, and sorting the RRHs from large to small.

In practical applications, step S2 includes the following steps:

step S21, counting the number of overlapped RRHs between every two virtual cells;

step S22, sorting the overlapping regions from large to small.

For example, the following steps are carried out:

as shown in fig. 4-a, according to the initial virtual cell division, the whole network can be divided into 5 overlapping areas, where the overlapping area 1 includes VC1, VC2, and VC3, and the maximum number of overlapping is between VC1 and VC2, and 3 overlapping areas are included; the overlapping area 2 comprises VC4 and VC5, and the maximum overlapping number is 1; the overlapping area 3 comprises VC6, VC7, VC8, VC9 and VC10, the maximum overlapping number is between VC7 and VC8, and the overlapping is 5; the overlapping area 4 comprises VC11 and VC12, and the maximum overlapping number is 2; the overlapping area 5 comprises VC13, VC14 and VC15, and the maximum overlapping number is between VC14 and VC15 and is overlapped by 3.

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

In practical applications, step S3 includes the following steps:

step S31, as shown in fig. 3-a, sequentially determining whether the maximum number of overlapping is greater than 0 for each overlapping region according to the order of the number of overlapping RRHs of different overlapping regions in step S22. If the maximum number of overlaps in each overlap region is equal to 0, which indicates that all the combinations satisfying the condition are completed, the process goes to step S4.

In step S32, as shown in fig. 3-a, if the maximum overlapping number of overlapping areas is greater than 0, it is determined whether the sum of users of two virtual cells with the maximum overlapping RRH number exceeds the user threshold. If the threshold is exceeded, the merge condition is not satisfied, the maximum number of overlaps is set to 0, and the process goes to step S2 to reorder.

In step S33, as shown in fig. 3-a, if the two virtual cells with the largest number of overlapping RRHs satisfy the user threshold, it is determined whether or not the ratio of the RRHs of the two virtual cells to the antennas of the user sum is greater than or equal to 1 according to the ZF precoding antenna condition. If the antenna ratio is less than 1, the combining condition is not satisfied, the maximum overlap number is set to 0, go to step S2, and reorder.

Step S34, as shown in fig. 3-a, when the merging condition is satisfied, merging the two virtual cells, subtracting 1 from the total number of the virtual cells, renumbering the virtual cells, and going to step S2, recalculating the virtual cell overlap number.

For example, the following steps are carried out:

as shown in fig. 4-a, when the system sets the multi-user threshold V to be 3, sorting according to step S2 by regions overlapping size, wherein the virtual cells with the largest overlapping area satisfy the user threshold and antenna ratio conditions, and performing a first merging, and in the overlapping area 1, VC1 and VC2 are merged to form a new VC1, which includes: u1, U2; RRH-P2, RRH-P3, RRH-P4, RRH-P5 and RRH-P6; in overlap region 2, VC4 and VC5 merge to form VC4, which includes: u4, U5; RRH-P9; in overlap region 3, VC7 and VC8 merge to form new VC7, which includes: u7, U8; RRH-P8, RRH-P10, RRH-P11, RRH-P12 and RRH-P13; in overlap region 4, VC11 and VC12 merge to form new VC11, which includes: u11, U12; RRH-P17, RRH-P19, RRH-P20; in overlap region 5, VC14 and VC15 merge to form 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 numbering is carried out again on VC1, VC2, VC3, VC4, VC5, VC6, VC7, VC8, VC9 and VC110, and the merging result is shown in figure 4-b.

Turning to step S2, counting the number of overlapping RRHs again, where the maximum number of overlapping between the overlapping area 2 and the overlapping area 4 is 0, performing a second combination in the overlapping

areas

1, 3, and 5, and numbering again to form VC1, VC2, VC3, VC4, VC5, VC6, and VC7 after the second combination according to the user threshold and antenna ratio conditions, where the combination result is shown in fig. 4-c.

Turning to step S2, as shown in fig. 3-a, the number of overlapping RRHs is counted again, the maximum number of overlapping

areas

1,2, 4, 5 is 0, third merging is performed in the overlapping area 3, according to the user threshold, VC3 does not meet the merging condition, VC4 and VC5 meet the user threshold and antenna ratio condition, after third merging, numbering is performed again to form VC1, VC2, VC3, VC4, VC5, and VC6, and the merging result is shown in fig. 4-c. At this point, all the overlap areas no longer satisfy the merge condition, and all the overlap numbers are set to 0, and the process goes to step S4.

Step S4, circularly comparing whether two virtual cells share the same RRH.

In practical applications, step S4 includes the following steps:

after the condition combination of step S3, there may be overlapping RRHs between the virtual cells that do not satisfy the condition combination. Sequentially and circularly comparing the two virtual cells, and sequentially and circularly comparing whether the two virtual cells share the same RRH in the circulation; if not, recycling the next RRH to compare with each other until all RRHs in the virtual cell are recycled; if the RRH is the same, the RRH biasing link is switched to. And when the pairwise cyclic comparison of all the virtual cells is completed, the division of the multi-user non-overlapped virtual cells is completed, and the whole program is finished.

Step S5, if the overlapped RRHs are disconnected, the two virtual cells both satisfy the precoding antenna ratio, and the overlapped RRHs are determined to be the virtual cell with a larger RSRP.

In practical applications, step S5 includes the following steps:

and for the overlapped RRHs after the conditions are combined, if the ratio of the base station to the user antenna meets the condition that rho is more than or equal to 1 after the two overlapped virtual cells are disconnected with the overlapped RRHs, judging the overlapped RRHs to the virtual cell with larger RSRP, and judging to finish the comparison of the next virtual cell and then returning to the circulation.

Step S6, if the overlapped RRHs are disconnected, only one virtual cell satisfies the precoding antenna ratio, and the overlapped RRHs determine the virtual cell that does not satisfy the antenna ratio.

In practical applications, step S6 includes the following steps:

and for the overlapped RRHs after the conditions are combined, if the RRHs of only one virtual cell and the user antenna ratio meet rho not less than 1 after the two overlapped virtual cells are disconnected with the overlapped RRHs, judging the overlapped RRHs to the virtual cells which do not meet the antenna ratio, and returning to the next virtual cell for comparison after judgment is finished.

Step S7, if the overlapped RRHs are disconnected, neither of the two virtual cells satisfies the precoding antenna ratio, a silent RRH is added to one of the virtual cells, and the overlapped RRHs are determined to be the virtual cell not added with the silent RRH.

In practical applications, step S7 includes the following steps:

and for the overlapped RRHs after the conditions are combined, if the RRHs of the two overlapped virtual cells are disconnected with the overlapped RRHs and the ratio of the RRHs of the two virtual cells to the user antenna does not meet that rho is more than or equal to 1, selecting the RRH with the largest RSRP from the silent RRHs, selecting the RRH with the largest RSRP to join the virtual cell, judging the overlapped RRHs to the virtual cell without joining the silent RRH, and returning to the next virtual cell for comparison after judgment is finished.

For example, the following steps are carried out:

the conditional combining result is shown in fig. 4-d, there are still 4 overlapped RRHs that do not satisfy the conditional combining between VC3 and VC4 in the overlapping area 3, and a comparison cycle is started from the sequence numbers of the RRHs, and it is obvious that after the disconnection with P10, both virtual cells satisfy the antenna ratio, so P10 judges the virtual cell VC3 with a larger RSRP, and in turn, P11 judges the virtual cell VC3, P12 judges the virtual cell VC4, and P13 judges the virtual cell VC4, and the offset result is shown in fig. 4-e.

In order to solve the problems of the overlapping virtual cells, such as interference and high sharing overhead, after combining the virtual cells, a hierarchical precoding technique is needed to perform the cells, as shown in fig. 3-b, which includes the following steps:

step S8, calculates the ZF precoding direction vector W in the virtual cell.

In practical applications, step S8 includes the following steps:

circulating each multi-user virtual cell, sharing user data and complete channel state information H & ltSL & gt between base stations in each virtual cell, including a large-scale channel matrix L with slow change and a small-scale channel matrix S with fast fading, and eliminating interference in the virtual cell by adopting ZF precoding in the virtual cell, so that a user precoding direction vector

When single data stream is transmitted, the jth column of the vector W represents the precoding direction vector W of the jth user in the virtual cell m_jLines 2(i-1) -2 i-1 represent the precoding direction vector W of the ith RRH for the jth user_i,j。

Step S9, calculating the initial value D of the power control factor⁰。

In practical applications, step S9 includes the following steps:

transmit power limitation per RRH:

wherein

Representing all U's within a virtual cell m_mIndividual user, d_m,jRepresenting the power diagonal factor of the jth user in the virtual cell m. The initial value of the power control factor can be solved:

and step S10, iteratively solving the optimal solution D of the power control factor.

In practical applications, step S10 includes the following steps:

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

wherein the content of the first and second substances,

the interference is multi-user interference in a virtual cell and co-channel interference between virtual cells; sigma_k ²Is additive white gaussian noise for user k.

When in use

According to the inequality

The problem is converted into:

a second formula; wherein the content of the first and second substances,

according to the initial D⁰Iteratively calculating g_m,k'(D|D^q-1)

Q

1,2, according to the above equation two, the geometric planning solution updates D^qWhen is coming into contact with

Stopping iteration, D ═ D^q。

And step S11, according to the known W and D, the maximum user rate of the whole network, namely the system throughput is obtained.

In practical applications, step S11 includes the following steps:

converting the diagonal matrix D to D^qAnd (5) carrying out the formula one to solve the user rate of the whole network. And at this point, the optimal solution of the user rate of the whole network under the multi-user virtual cell is completed.

According to the virtual cell merging method provided by the embodiment of the invention, a preset virtual cell which is formed in a preset area and takes UE as a center is obtained, and because a plurality of preset virtual cells which take UE as the center possibly exist in the preset area at the same time, strong interference can be formed among the preset virtual cells; therefore, whether the first virtual cell and the second virtual cell overlap or not needs to be judged, when the first virtual cell and the second virtual cell overlap is judged, whether the first virtual cell and the second virtual cell meet the merging condition or not needs to be continuously judged, the first virtual cell and the second virtual cell meeting the merging condition are merged into the multi-user virtual cell, so that the overlapped preset virtual cells are merged, strong interference among the original preset virtual cells is eliminated, the merged virtual cell is optimized by utilizing a layered precoding algorithm, the signal transmission rate between the RRH and the user is improved, the user rate of the whole network is improved, the problem that strong interference is generated between the overlapped virtual cells in the prior art is solved, and the signal transmission rate between the RRH and the user is reduced; and because the same RRH can simultaneously serve a plurality of users, the problem of low user rate of the whole network is caused.

In a fourth embodiment, an embodiment of the present invention provides a merging apparatus 10 for virtual cells, as shown in fig. 5, including:

the system comprises an area dividing unit 101, a Cell selection unit and a Cell selection unit, wherein the area dividing unit 101 is used for dividing an overlapping area consisting of at least 2 virtual cells in a preset area;

a processing unit 102, configured to, when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area divided by the area dividing unit 101 satisfy the 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.

According to the merging device of the virtual cells provided by the embodiment of the invention, the overlapping area of the virtual cells is divided by the area dividing unit, and because a plurality of virtual cells may exist in the overlapping area at the same time and strong interference may be formed between the virtual cells, the first virtual Cell Cel-1 and the second virtual Cell Cel-2 which satisfy the merging condition in the overlapping area need to be merged into a new virtual Cell Mu-Cell by the processing unit, so that the virtual cells which satisfy the merging condition are merged, the strong interference between the original virtual cells is eliminated, the signal transmission rate between the RRH and the user is increased, the user rate of the whole network is increased, the problem that the strong interference is generated between the overlapped virtual cells in the prior art is solved, and the signal transmission rate between the RRH and the user is reduced; and because the same RRH can simultaneously serve a plurality of users, the problem of low user rate of the whole network is caused.

Fifth, an embodiment of the present invention provides a merging apparatus 10 for virtual cells, as shown in fig. 6, including:

a data obtaining unit 103, configured to obtain 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;

the processing unit 102 is configured to compare the RSRP value acquired by the data acquiring unit 101 with an RSRP threshold value;

the area dividing unit 101 is configured to, when the processing unit 102 determines that the RSRP value is greater than or equal to the RSRP threshold value, re-divide the first remote radio head RRH into virtual cells serving the UE.

The area dividing unit 101 is further configured to divide an overlapping area formed by at least 2 virtual Cell cells in a preset area;

the processing unit 102 is further configured to, when the first virtual Cell-1 and the second virtual Cell-2 in the overlapping area divided by the area dividing unit 101 satisfy the 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.

Preferably, the first and second liquid crystal materials are,

Sixth embodiment, an embodiment of the present invention provides a network system, as shown in fig. 7-a and 7-b, including: 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.

It should be noted that, in practical applications, a baseband processing Unit (BBU) in a Base station (hereinafter, referred to as "Evolved Node B") is connected to at least one Remote Radio Head (RRH) through an optical fiber, and a User Equipment (hereinafter, referred to as "User Equipment") may measure a reference Signal Code Power (RSRP) through the RRH and send the measured reference Signal Code Power (RSRP) to the eNodeB as a basis for providing services for the eNodeB; the base station realizes Data exchange of users through a Network node (MME for short), a service GateWay (SGW for short), a Public Data Network GateWay (PGW for short) and a Network Protocol Multimedia Subsystem (IMS for short).

In the prior art, a communication cell under an eNodeB consists of a plurality of RRHs, and when a UE enters the coverage of the communication cell, the eNodeB allocates the RRHs to serve the UE according to an RSRP value uploaded by the UE; since one eNodeB comprises a plurality of communication cells, the coverage areas of the communication cells may overlap, resulting in strong interference between the communication cells; because the merging device of the virtual cells provided by the embodiment of the invention belongs to the eNodeB, RRHs serving UE under the eNodeB can be redistributed, so that the original communication cells have no boundary, and the eNodeB can distribute the RRHs to serve the UE according to the RSRP value uploaded by the UE, thereby improving the signal transmission rate between the RRHs and the user, and solving the problems that strong interference can be generated between overlapped virtual cells in the prior art, and the signal transmission rate between the RRHs and the user is reduced.

For example, as shown in fig. 7-a, the eNodeB allocating the serving RRH to UE-1 includes: RRH-1, RRH-2 and RRH-3, the eNodeB allocating the serving RRH for UE-2 comprising: 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 serving UE-2; because the coverage areas of the virtual cell for serving the UE-1 and the virtual cell for serving the UE-2 are overlapped, the two virtual cells need to be merged; at this time, as shown in FIG. 7-b, the eNodeB will be re-divided into RRHs for serving UE-1 and UE-2, and the re-allocated virtual cell includes RRH-1, RRH-2, RRH-3, RRH-4, RRH-5 and RRH-6, and serves both UE-1 and UE-2.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A method for combining virtual cells, comprising:

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:

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:

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

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;

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 content of the first and second substances,

the third calculation formula includes:

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

wherein the content of the first and second substances,

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

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

15. An apparatus for combining virtual cells, comprising:

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;

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

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.