KR101013795B1 - Method and system for administrating commom resource among femto cells - Google Patents

Abstract

The present invention relates to a method for managing shared resources between femtocells and a management system.

The method for managing shared resources between femtocells according to the present invention is a method for managing shared resources between femtocells through grouping in a femtocell system. A second step of measuring a radio channel environment with a cell base station and a femtocell base station, and transmitting the measured radio channel environment measurement value to a femtocell controller; and determining a macro cell to which the femtocell base station belongs by using the transmitted radio channel environment measurement value. A third step of creating, merging and regrouping a group in the macrocell to which the femtocell base station belongs, grouping the femtocell base station into a predetermined group, sharing the femtocells of the femtocell base stations grouped in the predetermined group so as not to interfere with each other And a fifth step of allocating resources.

Femtocell, shared resources, femtocell base station, wireless channel environment

Description

Method for managing shared resources between femtocells and management system {METHOD AND SYSTEM FOR ADMINISTRATING COMMOM RESOURCE AMONG FEMTO CELLS}

The present invention relates to a method for managing shared resources between femtocells and a management system.

Femto Cell is a system for providing enhanced voice communication and data communication to users at home or office. The femtocell base station may be arbitrarily installed or removed by the user. The femtocell base station communicates with the cellular carrier network through a DSL, a cable modem, or a broadband network using a separate radio frequency.

Through these femtocells, operators and users get the following advantages: First, an improved coverage is obtained by installing a femtocell base station in a region where a radio wave of a macrocell is weak, that is, a shaded region. Second, because the distance between the femtocell base station and the user is short, high capacity can be obtained with low power. Third, since the femtocell base station serves the indoor user, the macrocell can use more resources to the mobile user in the outdoors, and thus, the performance of the macrocell can be expected. Fourth, the operator can see the above effects without the additional installation and maintenance costs.

However, due to the characteristics of the femtocell that is arbitrarily installed and removed by the user, the operator may not plan the femtocell network intentionally. In addition, when a plurality of femtocells are installed in a limited area, the femtocells overlap with each other, and interference occurs between femtocells using the same resources. Such interference may reduce the performance of the femtocell.

Therefore, there is a need for a technique for preventing a femtocell from degrading due to interference between femtocells by using a shared resource adaptively to a surrounding situation.

Therefore, in order to solve the above problems, the present invention is to share the femtocell by femtocell grouping considering the radio channel environment of femtocells in order to prevent interference between femtocells using the same resources overlapping a plurality of femtocell regions An object of the present invention is to provide a method and management system for managing shared resources between femtocells that can efficiently manage resources.

In addition, the present invention, by managing the shared resources through femtocell grouping in consideration of the radio channel environment of the femtocell in the femtocell system, the femtocell inter-femtocell shared resource management method and management system that can prevent performance degradation due to inter-femtocell interference The purpose is to provide.

The method for managing shared resources between femtocells according to claim 1 is a method for managing shared resources between femtocells through grouping in a femtocell system, and the first step of registering a new femtocell base station installed in a specific area in a wireless communication provider network, wherein The second step of measuring the radio channel environment with the macro cell base station and the femtocell base station, and transmitting the measured radio channel environment measurement value to the femtocell controller, and determines the macro cell to which the femtocell base station belongs by using the transmitted radio channel environment measurement value A third step of generating, integrating and reorganizing a group in the macrocell to which the femtocell base station belongs, to a fourth step of grouping the femtocell base station into a predetermined group, so that the femtocells of the femtocell base stations grouped in the predetermined group do not interfere with each other. A fifth step of allocating shared resources.

The method for managing shared resources between femtocells according to claim 2 is the method for managing shared resources between femtocells according to claim 1, wherein the radio channel environment measurement value includes preamble signal strengths received from neighboring macrocell base stations and femtocell base stations.

The method for managing shared resources between femtocells according to claim 3 is the method for managing shared resources between femtocells according to claim 1, wherein the femtocell base station determines a macrocell and transmits the same to the femtocell controller.

In the method for managing shared resources between femtocells according to claim 4, in the method for managing shared resources between femtocells according to claim 1, in a third step, a femtocell controller determines a macrocell and transmits it to a femtocell base station.

In the method for managing shared resources between femtocells according to claim 5, the method for managing shared resources between femtocells according to claim 1 or 2, wherein the fourth step is received from a neighboring macrocell base station and a femtocell base station as a wireless channel environment measurement value. If the preamble signal strength is used, and the femtocell controller is all smaller than the predetermined signal strength, the femtocell controller generates a new group to include the femtocell in the group, and the preamble signal strength is at least one greater than the predetermined signal strength. In this case, the groups including the femtocell base stations are integrated and reorganized to include the femtocell in a predetermined group, and only radio channel environment measurements from the femtocell base station in the same macrocell as the femtocell are used.

In the method of managing shared resources between femtocells of the present invention according to claim 6, the method of managing shared resources between femtocells of the present invention according to claim 1, the fifth step is a process of allocating orthogonal resources so that femtocells in a predetermined group do not cause interference It includes more.

The femtocell inter-shared resource management system according to claim 7 is connected to a plurality of femtocell base stations for managing each femtocell, a plurality of femtocell base stations and a femtocell controller for controlling a plurality of femtocell base stations, each macrocell A macro cell base station for managing a cell, a femtocell controller connected to a wireless communication provider network, including a macro cell controller for controlling the macro cell base station, and installed in a specific area, the neighboring macro measured by the femtocell base station registered in the wireless service provider network Transmit radio channel environment measurements with cell base station and femtocell base station to the femtocell controller to determine which macrocell the femtocell base station will belong to, create, merge and regroup groups within the macrocell, grouping the femtocell base station into a given group , Femtocells of the femtocell base stations included in a predetermined group Allocate shared resources to avoid interference.

The inter-femtocell shared resource management system of the present invention of claim 8 is the inter-femtocell shared resource management system of the invention of claim 7, wherein the radio channel environment measurement value includes a preamble signal strength received from neighboring macrocell base stations and femtocell base stations.

In the inter-femtocell shared resource management system according to claim 9, in the femtocell inter-shared resource management system according to claim 7, the femtocell base station determines a macrocell and transmits it to a femtocell controller.

In the inter-femtocell shared resource management system according to claim 10, in the femtocell inter-shared resource management system according to claim 7, the femtocell controller determines a macrocell and transmits it to the femtocell base station.

The inter-femtocell shared resource management system according to claim 11 is the inter-femtocell shared resource management system according to claim 7 or 8, wherein preamble signal strengths received from neighboring macrocell base stations and femtocell base stations are used as measurement values for radio channel environment. The femtocell base station, when the preamble signal strength is all smaller than the predetermined signal strength, creates a new group to include the femtocell in the group, and when the preamble signal strength is at least one or more than the predetermined signal strength, the femtocell base stations The included groups are merged and reorganized to include the femtocell in a given group and only use radio channel environment measurements from the femtocell base station in the same macrocell as the femtocell.

The inter-femtocell shared resource management system of the present invention of claim 12 is the inter-femtocell shared resource management system of the present invention of claim 7, wherein femtocells in a predetermined group allocate resources that are orthogonal to each other so as not to cause interference.

The femtocell inter-shared resource management system according to claim 13 is connected to a plurality of femtocell base stations for managing each femtocell, a plurality of femtocell base stations and a femtocell controller for controlling a plurality of femtocell base stations, femtocell controller and wireless A wireless channel environment with a neighboring macrocell base station and a femtocell base station measured by a femtocell base station connected to a carrier network and including a macro cell base station for managing each macro cell and installed in a specific area and registered in a wireless carrier network. Send the measurement to the femtocell controller to determine which macrocell the femtocell base station will belong to, create, merge, and regroup the groups within the macrocell, grouping the femtocell base station into a given group, and of the femtocell base stations included in the given group. Allocate shared resources so that femtocells do not interfere with each other.

As described above, according to the femtocell shared resource management method and management system according to the present invention, femtocell considering the radio channel environment of femtocells in order to prevent interference between femtocells using the same resources overlapping a plurality of femtocell areas By grouping, it is possible to efficiently manage shared resources between femtocells.

In addition, according to the present invention, by managing the shared resources through femtocell grouping in consideration of the radio channel environment of the femtocell in the femtocell system, there is an effect that can prevent the performance degradation of the system due to inter-femtocell interference.

Specific matters other than the problem to be solved, the problem solving means, and the effects of the present invention as described above are included in the following embodiments and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only described in order to more easily disclose the contents of the present invention, but the scope of the present invention is not limited to the scope of the accompanying drawings that will be readily available to those of ordinary skill in the art. You will know.

1 is a view for explaining the structure of a shared resource management system between femtocells according to the present invention, Figure 2 is a view for explaining an example of a shared resource management system between femtocells according to the present invention.

As shown in Figures 1 and 2, the femtocell inter-shared resource management system according to the present invention, a plurality of femtocell base station (100a, 100b, 100c, 100d), femtocell controller 200, macrocell base station (300a, 300b) ), The macro cell controller 400.

The femtocell base stations 100a, 100b, 100c, 100d manage each femtocell 110a, 110b, 110c, 110d. Specifically, since femtocell base stations 100a, 100b, 100c, and 100d may be arbitrarily installed by a user, when a new femtocell base station (not shown) is installed, the first femtocell 110a and the second femtocell 110b. ), Like the third femtocell 110c, there are cases where the areas of several femtocells overlap each other, and a new femtocell like the fourth femtocell 110d is hardly affected by other femtocells. Therefore, an embodiment of the present invention is to prevent the femtocell performance degradation due to inter-femtocell interference by using resources adaptively to the surrounding situation. In addition, the femtocell base stations (100a, 100b, 100c, 100d) registered in the operator network measures the radio channel environment with the neighboring macrocell base stations (300a, 300b) and femtocell base stations (100a, 100b, 100c, 100d). For example, the measurement of the radio channel environment may be performed using preamble signal strengths received from neighboring macro cell base stations 300a and 300b and femtocell base stations 100a, 100b, 100c and 100d. 1 and 2, after the first femtocell base station 100a is installed by the user, the first femtocell base station 100a is the second femtocell base station 100b, the third femtocell base station 100c, and the fourth femtocell. The signal strength is measured by receiving the preamble signal from the base station 100d, the first macro cell base station 300a, and the second macro cell base station 300b. The measured value is transmitted to the femtocell controller 200.

The femtocell controller 200 is connected to a plurality of femtocell base stations 100a, 100b, 100c, 100d through a broadband network, and controls the plurality of femtocell base stations 100a, 100b, 100c, 100d. The femtocell controller 200 determines a macrocell to which the femtocell base station belongs, based on the values measured at the femtocell base stations 100a, 100b, 100c, and 100d. In this step, the femtocell base station determines itself and informs the femtocell controller 200, or the femtocell controller 200 determines and informs the femtocell base station. For example, when the radio channel environment is measured as a preamble signal strength received from a neighboring macrocell base station, a macrocell for transmitting a preamble having the largest received signal strength among preambles received from a neighboring macrocell base station is a macrocell to which the femtocell belongs. Can be determined. When the macrocell to which the femtocell belongs is determined, based on the measurement information received from the femtocell, the femtocell controller generates, integrates and reorganizes the group in the macrocell to which the femtocell belongs, and then includes the femtocell base station in a specific group. As another example, when the radio channel environment measurement is a preamble signal strength received from a neighboring macro cell base station, as shown in FIG. 2, the first femtocell base station 100a is the second femtocell base station 100b and the third femtocell base station. In operation 100c, after receiving the preamble signal from the fourth femtocell base station 100d and measuring the signal strength, the signal is transmitted to the femtocell controller 200 and the femtocell controller 200 transmits the signal to the first femtocell 110a based on this information. Grouping At this time, when the second femtocell 110b, the third femtocell 110c, and the fourth femtocell 110d all belong to a first macrocell (not shown) to which the first femtocell 110a belongs, and the second femtocell base station 100b, when the strength of the preamble signal from the third femtocell base station 110c exceeds a specific signal strength value, while the strength of the preamble signal from the fourth femtocell base station 110d does not exceed a specific signal strength value, In addition, when the first femtocell 110a and the second femtocell 110b belong to the group 1, the first femtocell 110a may be added to the group 1.

When the grouping process of the femtocell controller for the femtocell is finished, the femtocell controller 200 allocates shared resources so that femtocells in the group to which the femtocell belongs do not interfere with each other. At this time, for example, orthogonal resources may be allocated to femtocells in a group to which the corresponding femtocell belongs. For example, an OFDMA system may allocate different subchannels to femtocells in a group, or allocate resources that are orthogonal to each other using a frequency hopping scheme.

The macro cell base stations 300a and 300b manage respective macrocells (ie, the first macrocells of FIGS. 1 and 2), and their operations are controlled by the macrocell controller 400.

The macro cell controller 400 is connected to the femtocell controller 200 and a wireless communication provider network and controls the macro cell base stations 300a and 300b.

In the femtocell shared resource management system according to the present invention configured as described above, the femtocell controller measures the wireless channel environment measurement value with the neighboring macrocell base station and the femtocell base station measured by the femtocell base station installed in the wireless communication provider network installed in a specific area. To determine a macrocell to which a femtocell base station belongs, create, unify, and reorganize a group within the macrocell, grouping the femtocell base station into a predetermined group, and the femtocells of the femtocell base stations included in the predetermined group interfere with each other. Allocate shared resources so that they don't fall.

A method for managing a shared resource between femtocells using the shared resource management system between femtocells according to the present invention configured as described above will be described in detail with reference to FIG. 3.

3 is a flowchart illustrating a method for managing shared resources between femtocells according to the present invention.

As shown in FIG. 3, the method for managing shared resources between femtocells according to the present invention is a method for managing shared resources between femtocells through grouping in a femtocell system, and registers a new femtocell base station installed in a specific region in a wireless communication provider network. Step 1 (S100), the femtocell base station measures the radio channel environment with the neighboring macro cell base station and the femtocell base station, and transmits the measured radio channel environment measurement value to the femtocell controller (S200), the transmitted radio channel environment A third step (S300) of determining a macro cell to which the femtocell base station belongs by using the measurement value; a fourth step of generating, integrating, and reorganizing a group in the macro cell to which the femtocell base station belongs, to group the femtocell base station into a predetermined group; (S400) a fifth step of allocating shared resources so that femtocells of the femtocell base stations grouped in a predetermined group do not interfere with each other (S5) 00).

Here, the radio channel environment measurement value includes the preamble signal strength received from the neighboring macrocell base station and the femtocell base station. Using the preamble signal strength received from the neighboring macrocell base station and the femtocell base station as the measurement value of the radio channel environment, the femtocell controller generates a new group to include the femtocell in the group when the preamble signal strength is smaller than the predetermined signal strength. When the preamble signal strength is at least one greater than the predetermined signal strength, the femtocell base station is included in the predetermined group by integrating and reorganizing groups including the femtocell base stations, and the radio channel environment from the femtocell base station in the same macrocell as the femtocell. Use only measured values.

In a third step S300, the femtocell base station determines the macrocell and transmits it to the femtocell controller, or the femtocell controller determines the macrocell and transmits the macrocell to the femtocell base station.

The fifth step S500 may further include allocating orthogonal resources such that femtocells in a predetermined group do not cause interference.

According to the femtocell shared resource management method and management system according to the present invention configured as described above, femtocell grouping considering the radio channel environment of femtocells in order to prevent interference between femtocells using the same resources overlapping a plurality of femtocell areas By doing so, it is possible to efficiently manage shared resources between femtocells, and also to prevent performance degradation of the system due to interfemtocell interference.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from equivalent concepts should be construed as being included in the scope of the present invention.

1 is a view for explaining the structure of a shared resource management system between femtocells in accordance with the present invention.

2 is a view for explaining an example of a shared resource management system between femtocells in accordance with the present invention.

3 is a flowchart illustrating a method for managing shared resources between femtocells according to the present invention.

Claims (13)

A method for managing shared resources between femtocells through grouping in a femtocell system, A first step of registering a new femtocell base station installed in a specific area in a wireless carrier network; A second step of the femtocell base station measuring a radio channel environment with a neighboring macrocell base station and a femtocell base station, and transmitting the measured radio channel environment measurement value to a femtocell controller; Determining a macrocell to which the femtocell base station belongs by using the transmitted wireless channel environment measurement value; Generating, consolidating, and reorganizing groups within a macrocell to which the femtocell base station belongs, and grouping the femtocell base station into a predetermined group; And A fifth step of allocating shared resources such that femtocells of the femtocell base stations grouped in the predetermined group do not interfere with each other; Including, femtocell inter-shared resource management method. The method of claim 1, wherein the wireless channel environment measurement value, And a preamble signal strength received from the neighboring macrocell base station and the femtocell base station. The method of claim 1, wherein the third step, The femtocell base station determines the macrocell and transmits to the femtocell controller, shared resource management method between femtocells. The method of claim 1, The third step, The femtocell controller determines the macrocell and transmits to the femtocell base station, inter-femtocell shared resource management method. The method of claim 1 or 2, wherein the fourth step, The preamble signal strengths received from the neighboring macrocell base station and the femtocell base station are used as the measurement values of the radio channel environment, and the femtocell controller generates a new group when the preamble signal strengths are smaller than a predetermined signal strength. Include femtocells in the group, If the preamble signal strength is at least one greater than the predetermined signal strength, the femtocell base station is included in the predetermined group by integrating and reorganizing groups including the femtocell base stations, and from the femtocell base station in the same macrocell as the femtocell. A method for managing shared resources between femtocells using only wireless channel environment measurements. The method of claim 1, wherein the fifth step, A method of managing shared resources between femtocells, the method comprising: allocating resources orthogonal to each other so that femtocells in a predetermined group do not cause interference. A plurality of femtocell base stations for managing each femtocell; A femtocell controller coupled to the plurality of femtocell base stations and controlling the plurality of femtocell base stations; A macro cell base station managing each macro cell; And And a macrocell controller connected to the femtocell controller and a wireless carrier network and controlling the macrocell base station. Determining the macrocell to which the femtocell base station belongs to by transmitting the measurement value of the wireless channel environment between the neighboring macrocell base station and the femtocell base station measured by the femtocell base station registered in the wireless communication provider network and installed in a specific area, Creating, merging and regrouping groups in the macrocell, grouping the femtocell base station to a predetermined group, and allocating shared resources so that femtocells of the femtocell base stations included in the predetermined group do not interfere with each other. Resource Management System. The method of claim 7, wherein the wireless channel environment measurement value, The preamble signal strength received from the neighboring macrocell base station and the femtocell base station, inter-femtocell shared resource management system. The method of claim 7, wherein The femtocell base station determines the macrocell and transmits to the femtocell controller, femtocell inter-shared resource management system. The method of claim 7, wherein The femtocell controller determines the macrocell and transmits to the femtocell base station, inter-femtocell shared resource management system. 9. The method according to claim 7 or 8, The preamble signal strengths received from the neighboring macrocell base station and the femtocell base station are used as the measurement values of the radio channel environment, and the femtocell controller generates a new group when the preamble signal strengths are smaller than a predetermined signal strength. Include femtocells in the group, If the preamble signal strength is at least one greater than the predetermined signal strength, the femtocell base station is included in the predetermined group by integrating and reorganizing groups including the femtocell base stations, and from the femtocell base station in the same macrocell as the femtocell. A femtocell shared resource management system using only wireless channel environment measurements. The method of claim 7, wherein The femtocells in the predetermined group to allocate resources orthogonal to each other so as not to cause interference, shared resource management system between femtocells. A plurality of femtocell base stations for managing each femtocell; A femtocell controller coupled to the plurality of femtocell base stations and controlling the plurality of femtocell base stations; And A macrocell base station connected to a femtocell controller and a wireless communication network and managing each macrocell; Determining the macrocell to which the femtocell base station belongs to by transmitting the measurement value of the wireless channel environment between the neighboring macrocell base station and the femtocell base station measured by the femtocell base station registered in the wireless communication provider network and installed in a specific area, Creating, merging and regrouping groups in the macrocell, grouping the femtocell base station to a predetermined group, and allocating shared resources so that femtocells of the femtocell base stations included in the predetermined group do not interfere with each other. Resource Management System.

Images