CN114710219A - Baseband unit internal interference coordination method suitable for novel digital room subsystem - Google Patents
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Abstract
The invention relates to a method for coordinating interference in a baseband unit, which is suitable for a novel digital indoor distribution system, and is characterized in that the baseband unit supports 2-cell specification, resource allocation is divided into two groups, the highest resource isolation degree of two cells is ensured, the interference coordination effect is realized in a non-full load scene, the available resource of each cell is continuous full bandwidth, the resource utilization rate of the full frequency band is not influenced by the same frequency interference function, the baseband unit supports 4-cell specification, when the interference quantity is less than or equal to 1, the resource groups are divided into 2 resource groups, on one hand, the highest resource isolation degree of the interference adjacent zone edge in the presence of adjacent zone interference is ensured, on the other hand, the resource utilization rate of the full frequency band is not influenced, when the interference quantity is greater than or equal to 2, the resource groups are divided into 4 resource groups, on the other hand, the higher resource isolation degree of the interference adjacent zone edge in the presence of adjacent zone is ensured, on the other hand, the continuity of the required broadband resources is ensured, and the resource utilization rate of the cell frequency band is not influenced.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a baseband unit internal interference coordination method suitable for a novel digital indoor distribution system.
Background
Indoor coverage mainly comprises three construction modes of outdoor coverage indoor, traditional passive DAS and novel digital room. The method mainly adopts an outdoor coverage indoor mode in the initial stage of network construction, has the main advantage of low investment cost, but along with the improvement of network requirements, the outdoor coverage indoor mode is difficult to meet the requirement of network deep coverage. The source DAS indoor subsystem has a huge inventory market and high technical maturity, and the traditional passive DAS faces a new challenge facing 5G evolution: DAS is difficult to meet the requirement of 5G on larger capacity through multipath transformation, and 5G frequency bands are difficult to make good use of the existing DAS system. As shown in fig. 1, the novel digital room division adopts a three-level architecture of a baseband unit BU, an extension unit EU, and a remote unit RU, and is a mainstream construction mode of a 5G room division scene.
The baseband unit can support 2 cell specification and 4 cell specification, the 2 cell specification supports 1-2 cell, and the 4 cell specification supports 1-4 cell. A plurality of cells under the baseband unit are usually deployed at the same frequency, and the plurality of cells face the same frequency interference.
The traditional co-channel interference method comprises the following steps: hfr (hard frequency reuse) is that dividing the total frequency band into three segments (f1, f2, f3) reduces the frequency utilization; FFR (fractional frequency reuse) is to divide frequency resources into two sections, namely, central resources and non-central resources, wherein central users of each cell use the same central resources, then the non-central resources are divided into three sections, and adjacent cells use one section of frequency resources; the main idea of sfr (soft frequency reuse) is to divide the total frequency band into three segments, select one segment of adjacent cells as its edge resource, and use the other two segments as its center resource. Yet another conventional edge resource partitioning is into different 3 segments according to PCI mod 3. The common point of the interference coordination is that the central resource and the edge resource are fixedly divided, and the coordination effect is poor in a heavy-load scene.
The same frequency interference of the indoor distribution environment is lighter than that of the common network and the number of the interference adjacent regions is less. On one hand, the indoor walls are isolated more, and a plurality of cells under the baseband unit can be deployed on different floors to avoid same frequency interference; on the other hand, the indoor sub-scene has few users, even if a plurality of cells under the baseband unit are the same-frequency adjacent cells, users may not exist in some cells, and therefore the interference to the same-frequency adjacent cells can not be caused. If the room division scene continues to start the traditional interference coordination of fixed division of the central resource and the edge resource, the network performance is inevitably reduced.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a method for coordinating interference in a baseband unit, which is suitable for a novel digital indoor distribution system.
The adopted technical scheme is as follows:
a method for coordinating interference in a baseband unit suitable for a novel digital indoor distribution system comprises the following steps:
acquiring a cell specification supported by a baseband unit;
if the base band unit supports the 2-cell specification, dividing the resource allocation into two groups, and selecting the groups for each cell from the resource allocation groups according to the size of the cell Physical Cell Identifier (PCI);
if the base band unit supports the specification of 4 cells, determining the interference adjacent cells of the same base band unit which exist in the cell at most, if the interference adjacent cells of 1 same base band unit exist at most, dividing the resource allocation into two groups, and selecting the groups for each cell according to the interference adjacent cell relationship; if at most 2 or more interference adjacent cells of the same baseband unit exist, the resource allocation is divided into four groups, and the groups are selected for each cell according to the number and the relation of the interference adjacent cells.
Further, if the baseband unit supports the 2-cell specification, dividing the resource allocation into two groups, and selecting a group for each cell from the resource allocation groups according to the size of the cell physical cell identifier PCI, including:
if the base band unit supports the 2-cell specification, the resource allocation is divided into two groups, wherein the first group is: the starting position of the edge resource is the lowest frequency RB, the distribution direction is from the low frequency RB to the high frequency RB, and the second group is as follows: the starting position of the edge resource is the highest frequency RB, and the distribution direction is from the high frequency RB to the low frequency RB; according to the size of the cell physical cell identification PCI, a first group is configured for the cell with the smaller PCI, and then a second group is configured for the cell with the larger PCI.
Further, if there are at most 1 interfering neighboring cells of the same baseband unit, dividing the resource allocation into two groups, and performing group selection for each cell according to the relationship of the interfering neighboring cells, includes:
if 1 interference adjacent cell with the same baseband unit exists at most, dividing resource allocation into two groups, wherein the first group is as follows: the starting position of the edge resource is the lowest frequency RB, the distribution direction is from the low frequency RB to the high frequency RB, and the second group is as follows: the starting position of the edge resource is the highest frequency RB, and the distribution direction is from the high frequency RB to the low frequency RB; and selecting resource allocation groups for the cell and the interference adjacent cell according to the sequence of the number of the cell interference.
Further, the selecting resource allocation groups for the cell and the interfering neighbor according to the order of the cell interference number includes: selecting a first group of cells with smaller PCI in two cells of the adjacent cell which are mutually interfered, selecting a second group of cells with larger PCI in the two cells of the adjacent cell which are mutually interfered, and then selecting the first group of cells with the number of interference cells of 0 if the PCI of the cells with the number of interference cells of 0 is positioned between the PCI of the two cells of the adjacent cell which are mutually interfered.
Further, if there are at most 2 or more interference neighboring cells of the same baseband unit, dividing the resource allocation into four groups, and performing group selection for each cell according to the number and relationship of the interference neighboring cells, including:
if there are at most 2 or more interfering neighbors of the same baseband unit and if the number of RBs needed by a cell is less than half of the bandwidth, the resource allocation is divided into 4 groups, where the first group is: the starting position of the edge resource is RB0, the allocation direction is from RB0 to RB M, M +1 is the total number of RBs, and the second group is: the starting position of the edge resource is RB M, the distribution direction is from RB M to RB0, and the third group is: the starting position of the edge resource is RB N, N equals ceil (M/2), the allocation direction is from RB N to RB M, and the fourth group is: the starting position of the edge resource is RB (N-1), and the allocation direction is from RB (N-1) to RB 0; and selecting resource allocation groups for the cell and the interference adjacent cell according to the sequence of the number of the cell interference.
Further, the selecting resource allocation groups for the cell and the interfering neighbor according to the order of the cell interference number includes:
setting and starting four cells which are respectively a first cell, a second cell, a third cell and a fourth cell, wherein an interference adjacent cell of the first cell is the fourth cell, an interference adjacent cell of the second cell is the third cell and the fourth cell, an interference adjacent cell of the third cell is the second cell and the fourth cell, an interference adjacent cell of the fourth cell is the first cell, the third cell and the second cell, firstly allocating a group for the fourth cell, and then sequentially allocating a group for the first cell, the third cell and the second cell, wherein the fourth cell selects a first group, the first cell selects a second group, the third cell selects a third group, and the second cell selects a fourth group.
Further, if there are at most 2 or more interference neighboring cells of the same baseband unit, dividing the resource allocation into four groups, and performing group selection for each cell according to the number and relationship of the interference neighboring cells, including:
if there are at most 2 or more interfering neighbors of the same baseband unit, and if the number of RBs needed by a cell is greater than half of the bandwidth, the resource allocation is divided into 4 groups, where the first group is: the starting position of the edge resource is RB0, the allocation direction is from RB0 to RB M, M +1 is the total number of RBs, and the second group is: the starting position of the edge resource is RB M, the distribution direction is from RB M to RB0, and the third group is: the starting position of the edge resource is RB N, N equals ceil (M/2), the allocation direction is from RB N to RB M, and the fourth group is: the starting position of the edge resource is RB (N-1), and the allocation direction is from RB (N-1) to RB 0; and selecting resource allocation groups for the cell and the interference adjacent cell according to the sequence of the number of the cell interference.
Further, the selecting resource allocation groups for the cell and the interfering neighboring cell according to the order of the cell interference number includes:
setting and starting four cells, namely a first cell, a second cell, a third cell and a fourth cell, wherein the interference adjacent cell of the first cell is the fourth cell, the interference adjacent cell of the second cell is the third cell and the fourth cell, the interference adjacent cell of the third cell is the second cell and the fourth cell, the interference adjacent cell of the fourth cell is the first cell, the third cell and the second cell, setting the RB required by the third cell to be X, setting the RB required by the second cell to be Y, allocating a group for the fourth cell, and then allocating the groups for the first cell, the third cell and the second cell in sequence, wherein the fourth cell selects the first group, the first cell selects the second group, the third cell selects the third group, the second cell selects the fourth group, and the actual edge resource initial position of the third cell is min (N, M-X), the actual edge resource initial position of the second cell is N-1 max, y-1).
The embodiment of the invention at least has the following beneficial effects: the invention provides an interference coordination method in a baseband unit suitable for a novel digital indoor distribution system, which is an interference coordination method of a plurality of cells in the baseband unit based on two different specifications of the novel indoor distribution system, can achieve interference coordination effect in heavy load scene aiming at indoor distribution scene, and can fully ensure the utilization rate of full-frequency band resources when the same frequency interference is light, wherein, for 2-cell specification, the highest resource isolation degree of the two cells can be ensured, and the interference coordination effect can be realized in non-full load scene, in addition, because the available resources of each cell are continuous full bandwidth, the resource utilization rate of full-frequency band can not be influenced by the same frequency interference function, for 4-cell specification, the resource number can be ensured to be divided according to the number of interference cells, when the interference number is less than or equal to 1, the resource groups are divided, on one hand, the highest resource isolation degree of the edge between the interference neighbors can be ensured when the interference exists in the neighboring cells, on the other hand, the continuity of the full-bandwidth resources is guaranteed, the resource utilization rate of the full frequency band is not influenced, when the interference quantity is more than or equal to 2, 4 resource groups are divided, on the one hand, the fact that the isolation degree of the interference neighbor interval edge resources is maintained to be high when the interference of the neighbor cell exists can be guaranteed, on the other hand, the continuity of the required bandwidth resources is guaranteed, and the resource utilization rate of the cell frequency band is not influenced.
Drawings
FIG. 1 is a 5G indoor distributed micro base station system equipment architecture diagram;
FIG. 2 is a flow chart of a method for coordinating interference in a baseband unit of a digital indoor distribution system according to the present invention;
FIG. 3 is a schematic resource allocation diagram of a first group;
FIG. 4 is a schematic resource allocation diagram of a second group;
FIG. 5 is a schematic resource allocation diagram of a third group;
fig. 6 is a schematic resource allocation diagram of the fourth group.
Detailed Description
Fig. 1 is a flowchart of an interference coordination method in a baseband unit suitable for a novel digital indoor distribution system according to an embodiment of the present invention. The method for coordinating the interference in the baseband unit, which is suitable for the novel digital indoor distribution system and provided by the embodiment of the invention, can effectively solve two defects of fixed division of traditional center and edge resources in an indoor distribution environment, namely the defect that: the interference coordination effect of the heavy load scene is poor, and the defects are as follows: the fixed division limits the frequency resource utilization rate when the same frequency interference is light.
With reference to fig. 1, a specific process of the method for coordinating interference in a baseband unit of a digital indoor subsystem according to an embodiment of the present invention is described below.
And acquiring the cell specification supported by the baseband unit. In this embodiment, the cell specifications supported by the baseband unit are divided into two types, that is, the baseband unit supports 2 cell specifications, and the baseband unit supports 4 cell specifications.
For the base band unit supporting the 2-cell specification, the resource allocation is divided into two groups, and the group selection is performed for each cell from the resource allocation groups according to the size of the cell PCI (physical cell identity). As a specific embodiment, a specific implementation procedure is given below: the resource allocation is divided into two groups: the first group is: the edge Resource starting position is a lowest frequency RB (Resource Block, a Resource unit allocated for traffic channel resources, one time slot in the time domain, and 12 subcarriers in the frequency domain), the allocation direction is from a low frequency RB to a high frequency RB, and the second group is: the starting position of the edge resource is the highest frequency RB, and the distribution direction is from the high frequency RB to the low frequency RB; then, according to the size of the PCI of the cell, a first group is configured for the cell with smaller PCI, and then a second group is configured for the cell with larger PCI. The determination method of the smaller and larger PCIs may be comparing with a preset PCI threshold, where a larger PCI is larger and a smaller PCI is smaller than the PCI threshold, or directly comparing the PCIs of the two cells, where a larger PCI is larger and a smaller PCI is smaller. As another embodiment, one cell may be randomly selected to configure the first group, and another cell may be configured with the second group.
For downlink ICIC (inter-cell interference coordination), because the isolation of edge resources of two cells is high, the interference coordination effect can be exerted in a non-full-load heavy-load scene, resources are not fixedly divided, and the low resource utilization rate caused by the limitation of frequency resources is avoided. For the uplink ICIC, since the isolation of the edge resources of the two cells is high, the mutual interference of the UE (User Equipment) at the edge of the two cells can be reduced to the maximum extent.
If the base band unit supports the specification of 4 cells, determining the interference adjacent cells of the same base band unit which exist in the cell at most, if the interference adjacent cells of 1 same base band unit exist at most, dividing the resource allocation into two groups, and selecting the groups for each cell according to the interference adjacent cell relationship; if at most 2 or more interference adjacent cells of the same baseband unit exist, the resource allocation is divided into four groups, and the groups are selected for each cell according to the number and the relation of the interference adjacent cells.
If 1 interfering neighbor cell with the same baseband unit exists at most, dividing resource allocation into two groups, wherein the first group is as follows: the starting position of the edge resource is the lowest frequency RB, the distribution direction is from the low frequency RB to the high frequency RB, and the second group is as follows: the starting position of the edge resource is the highest frequency RB, and the allocation direction is from the high frequency RB to the low frequency RB. Then, selecting resource allocation groups for the cell and the interfering neighbor cell according to the sequence of the number of cell interferences, specifically: firstly, selecting a first group of cells with smaller PCI in two cells of the adjacent cell which mutually interfere, selecting a second group of cells with larger PCI in the two cells of the adjacent cell which mutually interfere, and then selecting the first group of cells with the number of interfering cells of 0 if the PCI of the cells with the number of 0 is between the PCI of the two cells of the adjacent cell which mutually interfere.
If at most 2 or more interference adjacent cells of the same baseband unit exist, the resource allocation is divided into four groups, and the groups are selected for each cell according to the number and the relation of the interference adjacent cells. The specific four groups are respectively as follows: the starting position of the edge resource is the lowest frequency RB, the distribution direction is from the low frequency RB to the high frequency RB, and the second group is as follows: the starting position of the edge resource is the highest frequency RB, the distribution direction is from the high frequency RB to the low frequency RB, and the third group is as follows: the initial edge resource starting position is a half bandwidth, the distribution direction is from low frequency RB to high frequency RB, and the fourth group is as follows: the initial edge resource starting position is a half bandwidth, and the allocation direction is from a high frequency RB to a low frequency RB. In this embodiment, there are two cases, respectively, when the number of RBs required by the cell is less than half of the bandwidth, and when the number of RBs required by the cell is greater than half of the bandwidth, which will be described in detail below.
If there are at most 2 or more interfering neighbors of the same baseband unit and if the number of RBs needed by a cell is less than half of the bandwidth, the resource allocation is divided into 4 groups, where the first group is: the starting position of the edge resource is RB0, the allocation direction is from RB0 to RB M, M +1 is the total number of RBs, as shown in fig. 3, the second group is: the starting position of the edge resource is RB M, and the allocation direction is from RB M to RB0, as shown in fig. 4, the third group is: the starting position of the edge resource is RB N, N ═ ceil (M/2), the allocation direction is from RB N to RB M, as shown in fig. 5, the ceil () function is used to return the smallest integer greater than or equal to the parenthesized value, and the fourth group is: the starting position of the edge resource is RB (N-1), and the allocation direction is from RB (N-1) to RB0, as shown in FIG. 6. Then, selecting resource allocation groups for the cell and the interfering neighbor cell according to the sequence of the number of cell interferences, specifically: setting and starting four cells which are respectively a first cell, a second cell, a third cell and a fourth cell, wherein an interference adjacent cell of the first cell is the fourth cell, an interference adjacent cell of the second cell is the third cell and the fourth cell, an interference adjacent cell of the third cell is the second cell and the fourth cell, an interference adjacent cell of the fourth cell is the first cell, the third cell and the second cell, firstly allocating a group for the fourth cell, and then sequentially allocating a group for the first cell, the third cell and the second cell, wherein the fourth cell selects a first group, the first cell selects a second group, the third cell selects a third group, and the second cell selects a fourth group. Examples are: assuming that the number of the 4 cells 1, 2, 3, 4 and 1 interfering neighbors is the largest, and the interfering neighbors of cell1 include cell4 and cell3, first group one is allocated to cell1, then group two is allocated to cell4, group three is allocated to cell3, and finally group four is allocated to cell 2.
If there are at most 2 or more interfering neighbors of the same baseband unit, and if the number of RBs needed by a cell is greater than half of the bandwidth, the resource allocation is divided into 4 groups, where the first group is: the starting position of the edge resource is RB0, the allocation direction is from RB0 to RB M, M +1 is the total number of RBs, and the second group is: the starting position of the edge resource is RB M, the distribution direction is from RB M to RB0, and the third group is: the starting position of the edge resource is RB N, N equals ceil (M/2), the allocation direction is from RB N to RB M, and the fourth group is: the starting position of the edge resource is RB (N-1), and the allocation direction is from RB (N-1) to RB 0; selecting resource allocation groups for the cell and the interference adjacent cell according to the sequence of the interference quantity of the cell, which specifically comprises the following steps: setting and starting four cells, namely a first cell, a second cell, a third cell and a fourth cell, wherein the interference adjacent cell of the first cell is the fourth cell, the interference adjacent cell of the second cell is the third cell and the fourth cell, the interference adjacent cell of the third cell is the second cell and the fourth cell, the interference adjacent cell of the fourth cell is the first cell, the third cell and the second cell, setting the RB required by the third cell to be X, setting the RB required by the second cell to be Y, allocating a group for the fourth cell, and then allocating the groups for the first cell, the third cell and the second cell in sequence, wherein the fourth cell selects the first group, the first cell selects the second group, the third cell selects the third group, the second cell selects the fourth group, and the actual edge resource initial position of the third cell is min (N, M-X), the actual edge resource initial position of the second cell is N-1 max, y-1). The min () function is a take minimum function and the max () function is a take maximum function.
Based on the above technical solution, several specific examples are given as follows.
The first example is as follows: base band unit 2 cell specification:
the cell bandwidth is 100MHz, 273RB in total, RB numbers are 0-272 from low frequency to high frequency, both cells are opened, wherein, cell represents cell, PCI of cell1 is 240, and PCI of cell2 is 78. Resource allocation is divided into two groups, group one: the starting position of the edge resource is RB0, the allocation direction is from RB0 to RB272, and the group two: the starting position of the edge resource is RB272, and the allocation direction is from RB272 to RB 0. Then according to the size of PCI or the sequence of the cell internal numbers, the resource allocation group is selected for the cell, the cell2 selects group one, and the cell1 selects group two.
Example two: the base band unit 4 has a cell specification, the maximum interference neighbor cell is less than or equal to 1, taking 1 as an example:
the cell bandwidth is 100MHz, 273RB in total, RB numbers from low frequency to high frequency are 0-272, 3 cells are started, the PCI of cell1 is 240, the PCI of cell2 is 78, the PCI of cell3 is 588, wherein the internal interference adjacent cell of the baseband unit is: cell1 and cell3 are adjacent to each other, and the number of interfering cells in cell2 is 0. Resource allocation is divided into two groups, group one: the starting position of the edge resource is RB0, the allocation direction is from RB0 to RB272, and the group two: the starting position of the edge resource is RB272, and the allocation direction is from RB272 to RB 0. Then according to the sequence of the cell interference number, selecting resource allocation groups for the cell and the interfering neighbor cell, selecting group one by cell1, selecting group two by cell3, and selecting group one by cell 2.
Sample three: the base band unit 4 has a cell specification, the maximum interference neighbor cell is equal to 3, the number of RBs required by the cell is less than a half of the bandwidth:
the cell bandwidth is 100MHz, 273RB altogether, RB is numbered from low frequency to high frequency and is 0 ~ 272, has opened 4 cells and has respectively: the PCI of cell1 is 240, the PCI of cell2 is 78, the PCI of cell3 is 588, and the PCI of cell4 is 124. The internal interference adjacent cell of the baseband unit is as follows: the interference neighbor cell of the cell1 is cell4, the interference cells of the cell2 are cell3 and cell4, the interference neighbor cell of the cell3 is cell2 and cell4, and the interference neighbor cell of the cell4 is cell1, cell3 and cell 2. Resource allocation is divided into 4 groups, group one: the starting position of the edge resource is RB0, and the allocation direction is from RB0 to RB 272. And a second group: the starting position of the edge resource is RB272, and the allocation direction is from RB272 to RB 0. And (4) group III: the edge resource start position is ceil (272/2) ═ 136 numbered RB136, and the allocation direction is from RB136 to RB 272. Group four: the edge resource starting position is ceil (272/2) -1 ═ 135 numbered RB135, and the allocation direction is from RB135 to RB 0. Selecting resource allocation groups for the cell and the interfering neighbor cells according to the sequence of the number of the cell interference: cell4 selects group one, cell1 selects group two, cell3 selects group three, and cell2 selects group four.
Example four: the base band unit 4 has a cell specification, the maximum interference neighbor cell is equal to 3, the number of RBs required by the cell is more than half of the bandwidth:
the cell bandwidth is 100MHz, 273RB altogether, RB is numbered from low frequency to high frequency and is 0 ~ 272, has opened 4 cells, is respectively: the PCI of cell1 is 240, the PCI of cell2 is 78, the PCI of cell3 is 588, and the PCI of cell4 is 124. The internal interference neighbor cell of the baseband unit specifically comprises: the interference neighbor cell of cell1 is cell4, the interference cells of cell2 are cell3 and cell4, the interference neighbor cell of cell3 is cell2 and 4, and the interference neighbor cell of cell4 is cell1, cell3 and cell 2. Furthermore, cell3 required 150 RBs and cell2 required 160 RBs. Resource allocation is divided into 4 groups, group one: the starting position of the edge resource is RB0, and the allocation direction is from RB0 to RB 272. And a second group: the starting position of the edge resource is RB272, and the allocation direction is from RB272 to RB 0. And (3) group III: the initial edge resource starting position is ceil (272/2) ═ 136 number RB136, and the allocation direction is from low frequency to high frequency. Group four: the initial edge resource starting position is ceil (272/2) -1 ═ 135 numbered RB135, and the allocation direction is from high frequency to low frequency. Selecting resource allocation groups for the cell and the interfering neighbor cells according to the sequence of the number of the cell interference: cell4 selects group one, cell1 selects group two, cell3 selects group three, and cell2 selects group four. Furthermore, the actual compiled resource start position of cell3 is min (136, 273- & 150) & gt 123, and the allocation direction is 150RB from RB123 to RB 272. The actual compiled resource start location of cell2 is max (135, 160-1) ═ 159, and the allocation direction is 160RB between RB159 and RB 0.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (8)
1. A method for coordinating interference in a baseband unit suitable for a novel digital indoor distribution system is characterized by comprising the following steps:
acquiring a cell specification supported by a baseband unit;
if the base band unit supports the 2-cell specification, dividing the resource allocation into two groups, and selecting the groups for each cell from the resource allocation groups according to the size of the cell Physical Cell Identifier (PCI);
if the base band unit supports the specification of 4 cells, determining the interference adjacent cells of the same base band unit which exist in the cell at most, if the interference adjacent cells of 1 same base band unit exist at most, dividing the resource allocation into two groups, and selecting the groups for each cell according to the interference adjacent cell relationship; if at most 2 or more interference adjacent cells of the same baseband unit exist, the resource allocation is divided into four groups, and the groups are selected for each cell according to the number and the relation of the interference adjacent cells.
2. The method for coordinating interference in baseband unit of new digital indoor subsystem as claimed in claim 1,
if the base band unit supports the 2-cell specification, the resource allocation is divided into two groups, and the group selection is performed for each cell from the resource allocation group according to the size of the cell Physical Cell Identifier (PCI), including:
if the base band unit supports the 2-cell specification, the resource allocation is divided into two groups, wherein the first group is: the starting position of the edge resource is the lowest frequency RB, the distribution direction is from the low frequency RB to the high frequency RB, and the second group is as follows: the starting position of the edge resource is the highest frequency RB, and the distribution direction is from the high frequency RB to the low frequency RB; according to the size of the cell physical cell identification PCI, a first group is configured for the cell with the smaller PCI, and then a second group is configured for the cell with the larger PCI.
3. The method for coordinating interference in baseband unit of new digital indoor subsystem as claimed in claim 1,
if at most 1 interference adjacent cell of the same baseband unit exists, dividing the resource allocation into two groups, and selecting the group for each cell according to the interference adjacent cell relationship, including:
if 1 interference adjacent cell with the same baseband unit exists at most, dividing resource allocation into two groups, wherein the first group is as follows: the starting position of the edge resource is the lowest frequency RB, the distribution direction is from the low frequency RB to the high frequency RB, and the second group is as follows: the starting position of the edge resource is the highest frequency RB, and the distribution direction is from the high frequency RB to the low frequency RB; and selecting resource allocation groups for the cell and the interference adjacent cell according to the sequence of the number of the cell interference.
4. The method for coordinating interference in baseband unit of new digital indoor subsystem as claimed in claim 3,
the selecting resource allocation groups for the cell and the interfering neighbor cell according to the sequence of the number of the cell interference comprises the following steps: selecting a first group of cells with smaller PCI in two cells of the adjacent cell which are mutually interfered, selecting a second group of cells with larger PCI in the two cells of the adjacent cell which are mutually interfered, and then selecting the first group of cells with the number of interference cells of 0 if the PCI of the cells with the number of interference cells of 0 is positioned between the PCI of the two cells of the adjacent cell which are mutually interfered.
5. The method for coordinating interference in baseband unit of new digital indoor subsystem as claimed in claim 1,
if at most 2 or more interference adjacent cells of the same baseband unit exist, the resource allocation is divided into four groups, and the group selection is performed on each cell according to the number and the relation of the interference adjacent cells, and the method comprises the following steps:
if at most 2 or more interference adjacent cells with the same baseband unit exist, and if the number of RBs required by the cells is less than half of the bandwidth, the resource allocation is divided into 4 groups, wherein the first group is as follows: the starting position of the edge resource is RB0, the allocation direction is from RB0 to RB M, M +1 is the total number of RBs, and the second group is: the starting position of the edge resource is RB M, the distribution direction is from RB M to RB0, and the third group is: the starting position of the edge resource is RB N, N equals ceil (M/2), the allocation direction is from RB N to RB M, and the fourth group is: the starting position of the edge resource is RB (N-1), and the allocation direction is from RB (N-1) to RB 0; and selecting resource allocation groups for the cell and the interference adjacent cell according to the sequence of the number of the cell interference.
6. The method for coordinating interference in baseband unit of new digital indoor subsystem as claimed in claim 5,
the selecting resource allocation groups for the cell and the interference neighbor cell according to the sequence of the interference number of the cell comprises the following steps:
setting and starting four cells which are respectively a first cell, a second cell, a third cell and a fourth cell, wherein an interference adjacent cell of the first cell is the fourth cell, an interference adjacent cell of the second cell is the third cell and the fourth cell, an interference adjacent cell of the third cell is the second cell and the fourth cell, an interference adjacent cell of the fourth cell is the first cell, the third cell and the second cell, firstly allocating a group for the fourth cell, and then sequentially allocating a group for the first cell, the third cell and the second cell, wherein the fourth cell selects a first group, the first cell selects a second group, the third cell selects a third group, and the second cell selects a fourth group.
7. The method for coordinating interference in baseband unit of new digital indoor subsystem as claimed in claim 1,
if at most 2 or more interference adjacent cells of the same baseband unit exist, the resource allocation is divided into four groups, and the group selection is performed on each cell according to the number and the relation of the interference adjacent cells, and the method comprises the following steps:
if there are at most 2 or more interfering neighbors of the same baseband unit, and if the number of RBs needed by a cell is greater than half of the bandwidth, the resource allocation is divided into 4 groups, where the first group is: the starting position of the edge resource is RB0, the allocation direction is from RB0 to RB M, M +1 is the total number of RBs, and the second group is: the starting position of the edge resource is RB M, the distribution direction is from RB M to RB0, and the third group is: the starting position of the edge resource is RB N, N equals ceil (M/2), the allocation direction is from RB N to RB M, and the fourth group is: the starting position of the edge resource is RB (N-1), and the allocation direction is from RB (N-1) to RB 0; and selecting resource allocation groups for the cell and the interference adjacent cell according to the sequence of the number of the cell interference.
8. The method for coordinating interference in baseband unit of new digital indoor subsystem as claimed in claim 7,
the selecting resource allocation groups for the cell and the interfering neighbor cell according to the sequence of the number of the cell interference comprises the following steps:
setting and starting four cells, namely a first cell, a second cell, a third cell and a fourth cell, wherein the interference adjacent cell of the first cell is the fourth cell, the interference adjacent cell of the second cell is the third cell and the fourth cell, the interference adjacent cell of the third cell is the second cell and the fourth cell, the interference adjacent cell of the fourth cell is the first cell, the third cell and the second cell, setting the RB required by the third cell to be X, setting the RB required by the second cell to be Y, allocating a group for the fourth cell, and then allocating the groups for the first cell, the third cell and the second cell in sequence, wherein the fourth cell selects the first group, the first cell selects the second group, the third cell selects the third group, the second cell selects the fourth group, and the actual edge resource initial position of the third cell is min (N, M-X), the actual edge resource initial position of the second cell is N-1 max, y-1).
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