CN114710219B - Baseband unit internal interference coordination method suitable for novel digital room subsystem - Google Patents
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Abstract
The invention relates to a baseband unit internal interference coordination method suitable for a novel digital room subsystem, which is characterized in that for a baseband unit supporting 2-cell specification, resource allocation is divided into two groups, the highest isolation of resources of two cells is ensured, and an interference coordination effect is realized in a non-full-load scene, because the available resources of each cell are continuous full bandwidth, the same-frequency interference function does not affect the resource utilization rate of full frequency bands, for a baseband unit supporting 4-cell specification, when the interference quantity is less than or equal to 1, the interference quantity is divided into 2 resource groups, on one hand, the highest isolation of the adjacent-cell edge resources can be ensured when adjacent-cell interference exists, on the other hand, the continuity of full-bandwidth resources is ensured, the resource utilization rate of full frequency bands is not affected, and when the interference quantity is more than or equal to 2, the division into 4 resource groups is ensured, on the one hand, the high isolation of the adjacent-cell edge resources is ensured when adjacent-cell interference exists, on the other hand, the continuity of the required broadband resources is ensured, and the resource utilization rate of the cell frequency bands is not affected.
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 subsystem.
Background
The indoor coverage mainly comprises an outdoor coverage indoor mode, a traditional passive DAS mode and a novel digital room mode. The method mainly adopts an outdoor indoor coverage mode in the initial stage of network construction, and has the main advantages of low investment cost, but with the increase of network requirements, the indoor coverage mode of the outdoor is difficult to meet the network depth coverage requirement. The source DAS room subsystem has a huge stock market and high technical maturity, and the traditional passive DAS faces new challenges in 5G evolution: DAS has difficulty in meeting 5G larger capacity requirements through multiplexing, and 5G frequency band has difficulty in utilizing existing DAS systems. As shown in fig. 1, the new digital room adopts three-level architecture of baseband unit BU-extension unit EU-remote unit RU, which is a mainstream construction mode of 5G room scenes.
The baseband unit may support a 2-cell specification and a 4-cell specification, the 2-cell specification supporting 1-2 cells, the 4-cell specification supporting 1-4 cells. The multiple cells under the baseband unit are usually deployed in the same frequency, and the multiple cells face the same frequency interference.
The traditional common-frequency interference method comprises the following steps: HFR (Hard frequency reuse) dividing the total frequency band into three segments (f 1, f2, f 3) reduces the frequency utilization; FFR (Fractional frequency reuse) dividing the frequency resource into two sections, namely a central resource and a non-central resource, wherein the central user of each cell uses the same central resource, and then dividing the non-central resource into three sections, and the adjacent cell uses one section of the frequency resource; SFR (soft frequency reuse) the main idea is to divide the total frequency band into three sections, where one section is selected as its own edge resource by the adjacent cell, the other two sections are selected as its own center resource, the center resource of the cell is used as the edge resource of the adjacent cell, and the power on the edge resource is higher than the power on the center resource. Yet another conventional edge resource partitioning is by PCI mod3 into different 3 segments. 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 scene with heavy load.
The indoor environment has lighter same frequency interference than the public network and less interference neighbor cells. On one hand, the indoor walls are separated by a plurality of partitions, and a plurality of cells under the baseband unit can be deployed on different floors to avoid the same-frequency interference; on the other hand, the indoor division scene has few users, and even if a plurality of cells under the baseband unit are co-frequency adjacent cells, some cells may not have users, so that the co-frequency adjacent cells are not interfered. If the indoor division scene continues to start the interference coordination of the traditional fixed division of the central resource and the edge resource, the network performance is likely to be reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a baseband unit internal interference coordination method suitable for a novel digital indoor subsystem.
The adopted technical scheme is as follows:
a baseband unit internal interference coordination method suitable for a novel digital room subsystem comprises the following steps:
acquiring cell specifications supported by a baseband unit;
if the baseband unit supports the 2-cell specification, dividing the resource allocation into two groups, and selecting groups for each cell from the resource allocation groups according to the size of the cell physical cell identifier PCI;
if the baseband unit supports the specification of 4 cells, determining interference neighbor cells of the same baseband unit which are most present in the cells, if the interference neighbor cells of the same baseband unit are at most present in 1, dividing resource allocation into two groups, and selecting groups for each cell according to the interference neighbor cell relation; if at most 2 or more interference neighbor cells with 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 neighbor cells.
Further, if the baseband unit supports the 2-cell specification, the resource allocation is divided into two groups, and according to the size of the cell physical cell identifier PCI, the selecting a group for each cell from the resource allocation group includes:
if the baseband unit supports the 2-cell specification, the resource allocation is divided into two groups, wherein the first group is: the initial 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: the initial 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 identifier PCI, a first group is configured for the cell with smaller PCI, and then a second group is configured for the cell with larger PCI.
Further, if there are at most 1 interference neighbor cells of the same baseband unit, the resource allocation is divided into two groups, and the selecting groups are performed for each cell according to the interference neighbor cell relation, including:
if at most 1 interference neighbor cell of the same baseband unit exists, the resource allocation is divided into two groups, wherein the first group is: the initial 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: the initial 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 cells and the interference neighbor cells according to the sequence of the number of the cell interference.
Further, the selecting a resource allocation group for the cell and the interference neighbor cell according to the order of the cell interference quantity includes: selecting a first group of cells with smaller PCI in two cells which are mutually interfered neighbor cells, selecting a second group of cells with larger PCI in the two cells which are mutually interfered neighbor cells, and selecting a first group of cells with 0 number of interference cells when PCI of a plurality of cells with 0 number of interference cells is positioned between PCI of the two cells which are mutually interfered neighbor cells.
Further, if there are at most 2 or more interference neighbor cells with the same baseband unit, the resource allocation is divided into four groups, and the group selection is performed for each cell according to the number and the relation of the interference neighbor cells, including:
if there are at most 2 or more interfering neighbor cells with the same baseband unit, and if the number of RBs required by the cell is less than half 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 allocation direction is from RB M to RB0, and 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, and the fourth group is: the initial position of the edge resource is RB (N-1), and the distribution direction is from RB (N-1) to RB0; and selecting resource allocation groups for the cells and the interference neighbor cells according to the sequence of the number of the cell interference.
Further, the selecting a resource allocation group for the cell and the interference neighbor cell according to the order of the cell interference quantity includes:
four cells are set to be started, namely a first cell, a second cell, a third cell and a fourth cell, wherein an interference neighboring cell of the first cell is a fourth cell, an interference neighboring cell of the second cell is a third cell and a fourth cell, an interference neighboring cell of the third cell is a second cell and a fourth cell, an interference neighboring cell of the fourth cell is a first cell, a third cell and a second cell, a group is firstly allocated to the fourth cell, and then the first cell, the third cell and the second cell are sequentially allocated to the group, 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 neighbor cells with the same baseband unit, the resource allocation is divided into four groups, and the group selection is performed for each cell according to the number and the relation of the interference neighbor cells, including:
if there are at most 2 or more interfering neighbor cells with the same baseband unit, and if the number of RBs required by the cell is greater than half 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 allocation direction is from RB M to RB0, and 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, and the fourth group is: the initial position of the edge resource is RB (N-1), and the distribution direction is from RB (N-1) to RB0; and selecting resource allocation groups for the cells and the interference neighbor cells according to the sequence of the number of the cell interference.
Further, the selecting a resource allocation group for the cell and the interference neighbor cell according to the order of the cell interference quantity includes:
four cells are set to be started, namely a first cell, a second cell, a third cell and a fourth cell, wherein the interference neighbor cell of the first cell is the fourth cell, the interference neighbor cell of the second cell is the third cell and the fourth cell, the interference neighbor cell of the third cell is the second cell and the fourth cell, the interference neighbor cell of the fourth cell is the first cell, the third cell and the second cell, the RBs required by the third cell are set to be X, the RBs required by the second cell are set to be Y, the fourth cell is firstly allocated with a group, then the first cell, the third cell and the second cell are sequentially allocated with a group, the fourth cell is selected with the first group, the first cell is selected with the second group, the third cell is selected with the third group, the second cell is selected with the fourth group, the actual edge resource starting position of the third cell is min (N, M-X), and the actual edge resource starting position of the second cell is (N-1, Y-1).
The embodiment of the invention has at least the following beneficial effects: the method for coordinating the interference in the baseband unit is based on the novel indoor subsystem, the interference coordination effect can be achieved in a heavy-load scene for the indoor subsystem, the full-band resource utilization rate can be fully guaranteed when the same-frequency interference is lighter, the maximum isolation degree of the two cells can be guaranteed for the 2-cell specification, the interference coordination effect is achieved in a non-full-load scene, in addition, the available resources of each cell are continuous full bandwidth, the same-frequency interference function does not affect the resource utilization rate of the full frequency band, the number of the resources can be guaranteed to be divided according to the number of the interference cells for the 4-cell specification, the maximum isolation degree of the adjacent-area edge resources can be guaranteed when the number of the interference is less than or equal to 1, the continuity of the full-bandwidth resources can be guaranteed when the number of the interference is more than or equal to 2, the 4-cell edge resources can be guaranteed when the number of the interference is more than or equal to 2, the high-bandwidth required by the adjacent-area edge resources can be guaranteed when the number of the interference is more than or equal to 2, and the continuous utilization rate of the adjacent-area edge resources can be guaranteed.
Drawings
FIG. 1 is a diagram of a 5G indoor distributed micro base station system equipment architecture;
fig. 2 is a flowchart of a method for coordinating interference in a baseband unit applicable to a novel digital indoor subsystem;
FIG. 3 is a schematic diagram of resource allocation for a first group;
FIG. 4 is a schematic diagram of resource allocation for a second group;
FIG. 5 is a schematic diagram of a third set of resource allocations;
fig. 6 is a schematic diagram of resource allocation for a fourth group.
Detailed Description
Fig. 1 is a flowchart of a baseband unit internal interference coordination method suitable for a novel digital indoor subsystem according to an embodiment of the present invention. The baseband unit internal interference coordination method suitable for the novel digital indoor subsystem provided by the embodiment of the invention can effectively solve two defects of the traditional fixed division of center and edge resources in indoor environment, namely, the defect: the interference coordination effect of the heavy load scene is poor, and the following two defects are caused: fixed partitioning limits frequency resource usage when co-channel interference is light.
With reference to fig. 1, a specific process of the baseband unit intra-interference coordination method applicable to the novel digital indoor subsystem according to the 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 2 cell specification, the resource allocation is divided into two groups, and the group selection is carried out for each cell from the resource allocation group according to the size of the cell PCI (physical cell identifier). As a specific embodiment, a specific implementation procedure is given below: the resource allocation is divided into two groups: the first group is: the initial position of the edge Resource is the lowest frequency RB (Resource Block, which is a Resource unit allocated to the traffic channel Resource, one time slot is in the time domain, 12 subcarriers are in the frequency domain), the allocation direction is from the low frequency RB to the high frequency RB, and the second group is: the initial 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 cells, a first group is configured for the cells with smaller PCI, and then a second group is configured for the cells with larger PCI. The determining manner of the smaller and larger PCIs may be comparing with a preset PCI threshold, where a larger PCI threshold is larger and a smaller PCI threshold is smaller, or directly comparing the PCIs of two cells, where a larger PCI is larger and a smaller PCI is smaller. As another embodiment, one cell may be selected randomly to configure the first group and the other cell may be selected to configure the second group.
For downlink ICIC (inter-cell interference coordination), since the isolation of edge resources of two cells is high, the interference coordination effect can be exerted in a non-fully loaded heavy-load scene, and resources are not fixedly divided, so that the low utilization rate of resources due to the limitation of frequency resources is avoided. For uplink ICIC, since the edge resource isolation of two cells is high, the mutual interference of two cell edge UEs (User Equipment) can be reduced to a maximum extent.
For the base band unit supporting 4 cell specifications, determining interference adjacent cells of the same base band unit with most cells, if at most 1 interference adjacent cell of the same base band unit exists, dividing resource allocation into two groups, and selecting groups for each cell according to the interference adjacent cell relation; if at most 2 or more interference neighbor cells with 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 neighbor cells.
If at most 1 interference neighbor cell of the same baseband unit exists, the resource allocation is divided into two groups, wherein the first group is: the initial 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: 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, selecting a resource allocation group for the cell and the interference neighbor cell according to the sequence of the number of the cell interference, specifically: selecting a first group of cells with smaller PCI in two cells which are mutually interfered neighbor cells, selecting a second group of cells with larger PCI in the two cells which are mutually interfered neighbor cells, and then selecting the first group of cells with 0 interference cells when PCI of the cells with 0 interference cells are positioned between PCI of the two cells which are mutually interfered neighbor cells.
If at most 2 or more interference neighbor cells with 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 neighbor cells. The specific four groups are respectively as follows: the starting position of the edge resource is the lowest frequency RB, the allocation 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 that: the initial edge resource starting position is half bandwidth, the allocation direction is from low frequency RB to high frequency RB, the fourth group: the initial edge resource starting position is half bandwidth, and the allocation direction is from high frequency RB to low frequency RB. In this embodiment, the following description is made in detail, respectively, when the number of RBs required by a cell is less than half the bandwidth, and when the number of RBs required by the cell is greater than half the bandwidth.
If there are at most 2 or more interfering neighbor cells with the same baseband unit, and if the number of RBs required by the cell is less than half 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, and the second group is: the edge resource starting position is RB M, the allocation direction is from RB M to RB0, as shown in fig. 4, and the third group is: the edge resource starting position is RB N, n=ceil (M/2), the allocation direction is from RB N to RB M, as shown in fig. 5, ceil () function is used to return the smallest integer greater than or equal to the value in parentheses, and the fourth group is: the edge resource starting position is RB (N-1), and the allocation direction is from RB (N-1) to RB0, as shown in FIG. 6. Then, selecting a resource allocation group for the cell and the interference neighbor cell according to the sequence of the number of the cell interference, specifically: four cells are set to be started, namely a first cell, a second cell, a third cell and a fourth cell, wherein an interference neighboring cell of the first cell is a fourth cell, an interference neighboring cell of the second cell is a third cell and a fourth cell, an interference neighboring cell of the third cell is a second cell and a fourth cell, an interference neighboring cell of the fourth cell is a first cell, a third cell and a second cell, a group is firstly allocated to the fourth cell, and then the first cell, the third cell and the second cell are sequentially allocated to the group, 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: assuming that the number of the interference neighbor cells of the 4 cells, namely the cell1, the cell2, the cell3, the cell4 and the cell1 is the largest, and the interference neighbor cells of the cell1 are the cell4 and the cell3, firstly, the cell1 is allocated with the first group, then the cell4 is allocated with the second group, the cell3 is allocated with the third group, and finally the cell2 is allocated with the fourth group.
If there are at most 2 or more interfering neighbor cells with the same baseband unit, and if the number of RBs required by the cell is greater than half 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 allocation direction is from RB M to RB0, and 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, and the fourth group is: the initial position of the edge resource is RB (N-1), and the distribution direction is from RB (N-1) to RB0; selecting a resource allocation group for the cells and the interference neighbor cells according to the sequence of the number of the cell interference, wherein the resource allocation group specifically comprises the following steps: four cells are set to be started, namely a first cell, a second cell, a third cell and a fourth cell, wherein the interference neighbor cell of the first cell is the fourth cell, the interference neighbor cell of the second cell is the third cell and the fourth cell, the interference neighbor cell of the third cell is the second cell and the fourth cell, the interference neighbor cell of the fourth cell is the first cell, the third cell and the second cell, the RBs required by the third cell are set to be X, the RBs required by the second cell are set to be Y, the fourth cell is firstly allocated with a group, then the first cell, the third cell and the second cell are sequentially allocated with a group, the fourth cell is selected with the first group, the first cell is selected with the second group, the third cell is selected with the third group, the second cell is selected with the fourth group, the actual edge resource starting position of the third cell is min (N, M-X), and the actual edge resource starting position of the second cell is (N-1, Y-1). The min () function is a minimum function and the max () function is a maximum function.
Based on the above technical solution, several specific examples are given below.
Sample one: baseband unit 2 cell specification:
the cell bandwidth is 100MHz, the total of 273RB, RB numbers from low frequency to high frequency are 0-272, and both cells are started, wherein in the following, cell represents a cell, the PCI of cell1 is 240, and the PCI of cell2 is 78. The resource allocations are divided into two groups, group one: the edge resource starting position is RB0, the allocation direction is from RB0 to RB272, group two: the edge resource start position is RB272, and the allocation direction is from RB272 to RB0. Then the resource allocation group is selected for the cell according to the size of the PCI or the sequence of the intra-cell numbers, cell2 selects group one, and cell1 selects group two.
Sample two: the base band unit 4 cell specification, the maximum interference neighbor cell is less than or equal to 1, taking 1 as an example:
the cell bandwidth is 100MHz, the total number of the 273 RBs is 0-272 from low frequency to high frequency, 3 cells are started, namely cell1 PCI is 240, cell2 PCI is 78, cell3 PCI is 588, wherein the internal interference neighbor of the baseband unit is: cell1 and cell3 are interfering neighbors, and the number of interfering cells of cell2 is 0. The resource allocations are divided into two groups, group one: the edge resource starting position is RB0, the allocation direction is from RB0 to RB272, group two: the edge resource start position is RB272, and the allocation direction is from RB272 to RB0. Then selecting resource allocation groups for the cells and the interference neighbor cells according to the sequence of the number of the interference of the cells, selecting a first group for the cell1, selecting a second group for the cell3, and selecting a first group for the cell2.
Sample three: the base band unit 4 cell specification, the maximum interference neighbor cell is equal to 3, and the number of RBs required by the cell is less than half bandwidth:
the cell bandwidth is 100MHz, the total number of the 273 RBs is 0-272 from low frequency to high frequency, and 4 cell groups are opened: cell1 had a PCI of 240, cell2 had a PCI of 78, cell3 had a PCI of 588, and cell4 had a PCI of 124. Wherein the internal interference neighbor of the baseband unit is: the interference neighbor of cell1 is cell4, the interference neighbor of cell2 is cell3 and cell4, the interference neighbor of cell3 is cell2 and cell4, and the interference neighbor of cell4 is cell1, cell3 and cell2. The resource allocations are divided into 4 groups, group one: the edge resource start position is RB0 and the allocation direction is from RB0 to RB272. Group II: the edge resource start position is RB272, and the allocation direction is from RB272 to RB0. Group III: the edge resource start position is ceil (272/2) =136 number RB136, and the allocation direction is from RB136 to RB272. Group four: the edge resource starting position is ceil (272/2) -1=135 numbered RB135, and the allocation direction is from RB135 to RB0. Then selecting resource allocation groups for the cells and the interference neighbor cells according to the order of the number of the cell interference: cell4 selects group one, cell1 selects group two, cell3 selects group three, and cell2 selects group four.
Sample four: the base band unit 4 cell specification, the maximum interference neighbor cell is equal to 3, and the number of RBs required by the cell is greater than half bandwidth:
the cell bandwidth is 100MHz, the total number of the 273 RBs is 0-272 from low frequency to high frequency, 4 cells are opened, and the steps are as follows: cell1 had a PCI of 240, cell2 had a PCI of 78, cell3 had a PCI of 588, and cell4 had a PCI of 124. The internal interference neighbor cell of the baseband unit is specifically: the interference neighbor of cell1 is cell4, the interference neighbor of cell2 is cell3 and cell4, the interference neighbor of cell3 is cell2 and cell4, and the interference neighbor of cell4 is cell1, cell3 and cell2. Furthermore, the number of RBs required for cell3 is 150, and the number of RBs required for cell2 is 160. The resource allocations are divided into 4 groups, group one: the edge resource start position is RB0 and the allocation direction is from RB0 to RB272. Group II: the edge resource start position is RB272, and the allocation direction is from RB272 to RB0. Group III: the initial edge resource start 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. Then selecting resource allocation groups for the cells and the interference neighbor cells according to the order of the number of the cell interference: cell4 selects group one, cell1 selects group two, cell3 selects group three, and cell2 selects group four. Further, the actual compiled resource start position of cell3 is min (136, 273-150) =123, and the allocation direction is 150RB from RB123 to RB272. The actual compiled resource start position of cell2 is max (135, 160-1) =159, and the allocation direction is 160RB from RB159 to RB0.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (7)
1. The method for coordinating the interference in the baseband unit suitable for the novel digital indoor subsystem is characterized by comprising the following steps of:
acquiring cell specifications supported by a baseband unit;
if the baseband unit supports the 2-cell specification, dividing the resource allocation into two groups, and selecting groups for each cell from the resource allocation groups according to the size of the cell physical cell identifier PCI;
if the baseband unit supports the specification of 4 cells, determining interference neighbor cells of the same baseband unit which are most present in the cells, if the interference neighbor cells of the same baseband unit are at most present in 1, dividing resource allocation into two groups, and selecting groups for each cell according to the interference neighbor cell relation; if at most 2 or more interference neighbor cells with the same baseband unit exist, dividing resource allocation into four groups, and selecting groups for each cell according to the number and the relation of the interference neighbor cells;
if the baseband unit supports 2-cell specification, dividing the resource allocation into two groups, and selecting groups for each cell from the resource allocation groups according to the size of the cell physical cell identifier PCI, including:
if the baseband unit supports the 2-cell specification, the resource allocation is divided into two groups, wherein the first group is: the initial 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: the initial 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 identifier PCI, a first group is configured for the cell with smaller PCI, and then a second group is configured for the cell with larger PCI.
2. The method for interference coordination in baseband units suitable for a novel digital indoor subsystem according to claim 1, wherein,
if at most 1 interference neighbor cell with the same baseband unit exists, the resource allocation is divided into two groups, and the group selection is performed for each cell according to the interference neighbor cell relation, including:
if at most 1 interference neighbor cell of the same baseband unit exists, the resource allocation is divided into two groups, wherein the first group is: the initial 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: the initial 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 cells and the interference neighbor cells according to the sequence of the number of the cell interference.
3. The method for interference coordination in baseband units suitable for a novel digital indoor subsystem according to claim 2, wherein,
the selecting a resource allocation group for the cells and the interference neighbor cells 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 which are mutually interfered neighbor cells, selecting a second group of cells with larger PCI in the two cells which are mutually interfered neighbor cells, and selecting a first group of cells with 0 number of interference cells when PCI of a plurality of cells with 0 number of interference cells is positioned between PCI of the two cells which are mutually interfered neighbor cells.
4. The method for interference coordination in baseband units suitable for a novel digital indoor subsystem according to claim 1, wherein,
if there are at most 2 or more interference neighbor cells with the same baseband unit, the resource allocation is divided into four groups, and the group selection is performed for each cell according to the number and the relation of the interference neighbor cells, including:
if there are at most 2 or more interfering neighbor cells with the same baseband unit, and if the number of RBs required by the cell is less than half 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 is the total number of RBs, and the second group is: the starting position of the edge resource is RB M, the allocation direction is from RB M to RB0, and the third group is: the starting position of the edge resource is RB N, n=ceil (M/2) -1, the allocation direction is from RB N to RB M, and the fourth group is: the initial position of the edge resource is RB (N-1), and the distribution direction is from RB (N-1) to RB0; and selecting resource allocation groups for the cells and the interference neighbor cells according to the sequence of the number of the cell interference.
5. The method for interference coordination in a baseband unit for a novel digital indoor subsystem according to claim 4, wherein,
the selecting a resource allocation group for the cells and the interference neighbor cells according to the sequence of the number of the cell interference comprises the following steps:
four cells are set to be started, namely a first cell, a second cell, a third cell and a fourth cell, wherein an interference neighboring cell of the first cell is a fourth cell, an interference neighboring cell of the second cell is a third cell and a fourth cell, an interference neighboring cell of the third cell is a second cell and a fourth cell, an interference neighboring cell of the fourth cell is a first cell, a third cell and a second cell, a group is firstly allocated to the fourth cell, and then the first cell, the third cell and the second cell are sequentially allocated to the group, 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.
6. The method for interference coordination in baseband units suitable for a novel digital indoor subsystem according to claim 1, wherein,
if there are at most 2 or more interference neighbor cells with the same baseband unit, the resource allocation is divided into four groups, and the group selection is performed for each cell according to the number and the relation of the interference neighbor cells, including:
if there are at most 2 or more interfering neighbor cells with the same baseband unit, and if the number of RBs required by the cell is greater than half 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 is the total number of RBs, and the second group is: the starting position of the edge resource is RB M, the allocation direction is from RB M to RB0, and the third group is: the starting position of the edge resource is RB N, n=ceil (M/2) -1, the allocation direction is from RB N to RB M, and the fourth group is: the initial position of the edge resource is RB (N-1), and the distribution direction is from RB (N-1) to RB0; and selecting resource allocation groups for the cells and the interference neighbor cells according to the sequence of the number of the cell interference.
7. The method for interference coordination in baseband units suitable for use in a novel digital indoor subsystem according to claim 6,
the selecting a resource allocation group for the cells and the interference neighbor cells according to the sequence of the number of the cell interference comprises the following steps:
four cells are set to be started, namely a first cell, a second cell, a third cell and a fourth cell, wherein the interference neighbor cell of the first cell is the fourth cell, the interference neighbor cell of the second cell is the third cell and the fourth cell, the interference neighbor cell of the third cell is the second cell and the fourth cell, the interference neighbor cell of the fourth cell is the first cell, the third cell and the second cell, the RBs required by the third cell are set to be X, the RBs required by the second cell are set to be Y, the fourth cell is firstly allocated with a group, then the first cell, the third cell and the second cell are sequentially allocated with a group, the fourth cell is selected with the first group, the first cell is selected with the second group, the third cell is selected with the third group, the second cell is selected with the fourth group, the actual edge resource starting position of the third cell is min (N, M-X), and the actual edge resource starting position of the second cell is (N-1).
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