CN101777956A - Method for coordinating semi-static interference - Google Patents
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Abstract
The invention discloses a method for coordinating semi-static interference, comprising the steps as follows: configuring frequency resources for cells of each base station according to a preset frequency distribution strategy when a system is in an initial state, wherein the frequency resources comprise movable bandwidth; performing united interference coordination when the base station to which user equipment (UE) belongs receives a united interference coordination request sent by an adjacent cell base station after the UE enters the cell interference measurement and reporting stage; and performing distributed interference coordination process according to the interference measurement reports and movable bandwidth of the cell thereof when the base station to which the UE belongs receives the interference measurement reports sent by the UE. By adopting the above scheme, the method for coordinating semi-static interference in the invention is suitable for a scene in which each cell has uniform load distribution as well as a scene in which each cell has non-uniform load distribution.
Description
Technical Field
The invention relates to an interference coordination technology in the field of cellular wireless communication, in particular to a semi-static interference coordination method.
Background
In a Long Term Evolution (LTE) system, an Orthogonal Frequency Division Multiple Access (OFDMA) is used for a downlink channel, and a single carrier frequency division multiple access (SC-FDMA) is used for an uplink channel as a core transmission technology. The transmission technology uses orthogonal frequency sub-channels to distinguish users, so that the interference among users in a cell is very small and can be ignored, and therefore, the interference suffered by the users in the cell mainly comes from adjacent cells. Particularly, in the same-frequency networking situation, there may be mutual interference between adjacent cells, particularly in the edge area of a Cell, and thus, it is necessary to introduce Inter-Cell interference coordination (ICIC).
Interference coordination, also called interference avoidance, is to reduce interference between cells to a certain extent by reasonably planning and restricting the use of resources, so as to improve the user experience of edge users. That is, it improves the performance of cell edge users to some extent by sacrificing the performance of cell center users. There are many methods for interference coordination, and a method for interference coordination based on soft frequency reuse is more typical.
Soft frequency reuse is an improvement over conventional frequency reuse methods. The conventional frequency reuse method is to divide the frequency resources into a plurality of different parts, and then the adjacent cells use completely different frequency resources, and the non-adjacent cells can reuse the same frequency resources. Due to the spatial isolation, the interference between cells using the same frequency resource can be maintained below a certain level, so that the capacity of the entire system can be increased from the system perspective. Since the conventional frequency reuse makes the frequency resources used by the adjacent cells completely different, although this can greatly improve the performance of the cell edge users, it sacrifices the communication quality of the cell center users and the capacity of the whole network, and therefore is not recommended to be used in the LTE system with high requirements on the spectrum utilization. In order to ensure higher spectral efficiency and simultaneously give consideration to the performance of cell center users and edge users, many manufacturers and research organizations have proposed the concept of soft frequency reuse.
The soft frequency reuse is characterized in that the frequency reuse factor is 1 in the center area of the cell, and the frequency reuse factor is greater than 1 in the edge area of the cell, that is, the frequency used in the center area of each cell can be completely reused, and the frequency resources used in the edge areas of the adjacent cells cannot be reused. Meanwhile, as the central area is closer to the base station, the communication can be carried out by using lower transmitting power; the cell edge area is far from the base station and needs to use large transmission power for communication.
The interference coordination method based on soft frequency reuse can be divided into three basic forms according to different periods of resource allocation usage, namely: dynamic interference coordination, static interference coordination, and semi-static interference coordination.
The dynamic interference coordination means that the available frequency resources and power resources can be coordinated and used very flexibly and very quickly among the cells (the period of the dynamic interference coordination is generally several milliseconds). For example, a and B are neighboring cells, and if there are more users in the a cell and fewer users in the edge of the B cell, the frequency resources used in the edge of the a cell may be increased and the frequency resources used in the edge of the B cell may be decreased. Of course, the edge users of the cell change from time to time, and therefore the period of such resource adjustment should coincide with the change period of the edge users. If time synchronization can be guaranteed, the use dimension of the resource can be expanded to the time dimension; the use dimension of resources can also be extended to the spatial dimension if efficient use of smart antennas can be guaranteed.
Obviously, the dynamic interference coordination can adapt to the service change of the cell well, especially the service change situation of the edge user. By flexibly allocating available resources among cells with different service loads, the service requirements of each cell are met to the maximum extent under the condition of ensuring a certain interference level. However, considering that the interference level needs to be measured and evaluated first in the cell, and meanwhile, the corresponding interference information and the resource use condition need to be transmitted immediately and quickly between cells, so that the system overhead of communication between cells is greatly increased, and the calculation complexity of the base station is correspondingly increased. Even in some cases, the system overhead caused by the introduction of the dynamic soft frequency reuse is still larger than the interference coordination gain increase caused by the dynamic soft frequency reuse, so that the method is usually only used as a reference standard and is not popularized and applied in practice.
Static interference coordination is implemented in a network planning and adjusting phase, and the period of adjustment is usually in units of days. During network planning or monitoring, edge users of different cells will exhibit certain rules in long-term statistical data, including load balance among cells and load fluctuation regularity among cells. Generally, these characteristics can be used as a reference for static soft frequency reuse among cells. For example, in some regions populated by people on weekends, the available resources of the corresponding cell, especially in the edge region, can be increased during these peak load periods, so that the interference in the region can be kept at a certain low level, while the overall throughput of the cell and its neighbouring cells is not too much affected.
The long periodicity of the static interference coordination brings the advantages of system overhead reduction, including reduction of signaling interaction and information feedback quantity between cells in unit time, reduction of calculation complexity of a base station and the like. Of course, such overhead reduction is also costly, that is, for some cases that do not conform to the current resource configuration, the scheme cannot flexibly cope with the situation and perform targeted processing.
The implementation period of semi-static interference coordination is between dynamic interference coordination and static interference coordination, and the proposal thereof is a trade-off between system overhead and performance. The execution period of the semi-static interference coordination is generally in units of minutes. Since the traffic distribution and load size of a cell are constantly changing, the change can be followed regularly. The semi-static interference coordination is to perform interference coordination operation by combining with specific interference conditions on the premise of following the large rule, so that the overhead of the system for interference coordination and the system interference level are controlled at a certain level, the performance of cell edge users is greatly improved, and the influence on central users is reduced as much as possible. Due to the compromise characteristic of semi-static state, the semi-static interference coordination can be emphasized by standardization organizations and is used as a basic characteristic for popularization and application.
However, the existing semi-static interference coordination method generally aims at a scene where the load distribution of each cell is uniform, that is, an application scene where the service load capacity of each cell is completely the same, and as the reserved resource for interference coordination of each cell is not variable, the semi-static interference coordination method cannot be applied to a scene where the load distribution of each cell is non-uniform, that is, in a scene where the load distribution of each cell is non-uniform, the existing semi-static interference coordination technical scheme cannot effectively implement interference coordination.
Disclosure of Invention
In view of this, the present invention is directed to a semi-static interference coordination method, which is suitable for a scenario where load distribution of each cell is uniform, and is also suitable for a scenario where load distribution of each cell is non-uniform.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a semi-static interference coordination method comprises the following steps:
a. when the system is in an initial state, each base station configures frequency resources for the cell according to a preset frequency allocation strategy, wherein the frequency resources comprise active bandwidths;
b. after User Equipment (UE) enters a cell interference measurement and reporting stage, when a base station to which the UE belongs receives a joint interference coordination request sent by an adjacent cell base station, executing a joint interference coordination process; and when the base station to which the UE belongs receives an interference measurement report sent by the UE, executing a distributed interference coordination process according to the interference measurement report and the active bandwidth of the cell.
Preferably, the frequency allocation policy is:
for a network structure adopting an N cell model, the method is based on a formulaAnd
determining interference coordination reserved resource f of each celliAnd an active bandwidth Ai；
Wherein,
i is more than 0 and less than or equal to N, j is more than 0 and less than or equal to N, i is not equal to j, and F is a total interference coordination reserved resource of the system; a is the total active bandwidth of the system; f. ofiCoordinating frequency resources for interference allocated to an ith cell of the N neighboring cells; a. theiIs the active bandwidth allocated to the ith cell of the N neighboring cells.
Preferably, the distributed interference coordination is as follows:
x1, the base station determines the interference level of the cell where the UE is located according to the currently received interference measurement report sent by the UE;
x2, judging whether the interference level is larger than a preset maximum interference threshold value, if so, executing a step x3, otherwise, executing a step x 6;
x3, according to a preset active bandwidth adjusting strategy, increasing the active bandwidth of the cell, and adding one to the distributed interference coordination counter;
x4, judging whether the distributed interference coordination counter is larger than a preset maximum interference threshold value, if so, executing a step x 5; otherwise, returning to execute the step b;
x5, sending a joint interference request to the adjacent cell base station, and returning to execute the step b;
x6, judging whether the interference level is smaller than a preset minimum interference threshold value, if so, executing a step x7, otherwise, setting the distributed interference coordination counter to zero, and returning to execute the step b;
x7, judging whether the cell has an active bandwidth, if so, executing a step x8, otherwise, returning to execute the step b;
x8, reducing the active bandwidth of the cell according to the preset active bandwidth adjusting strategy, and returning to execute the step b.
Preferably, the joint interference coordination is as follows:
the base station sends a joint interference coordination request received from a base station of an adjacent cell to a known service node;
and the service node performs joint optimization allocation of resources according to the received joint interference coordination request message.
Preferably, the service node is a mobility management entity, a service gateway, or a base station pre-designated by the system.
In summary, the semi-static interference coordination method provided by the present invention introduces the concept of active bandwidth when configuring frequency resources for each cell, so that the frequency resources used by each cell can dynamically change with the change of cell load, and thus the present invention can not only effectively implement interference coordination in a scenario where the load distribution of each cell is uniform, but also in a scenario where the load distribution of each cell is non-uniform. In addition, the invention sends the joint interference coordination request to the base station of the adjacent cell when the distributed interference coordination is invalid, and effectively combines the distributed interference coordination and the joint interference coordination, thereby reducing the system overhead as much as possible on the premise of effectively reducing the interference level between the adjacent cells.
Drawings
FIG. 1 is an exemplary diagram of an active bandwidth configuration;
FIG. 2 is a flowchart of a first embodiment of the present invention;
fig. 3 is a schematic diagram of cell frequency resource allocation when a network structure adopts a 3-cell model;
fig. 4 is a schematic diagram of a cell frequency resource allocation when a network structure adopts a 7-cell model;
fig. 5 is a schematic diagram of another cell frequency resource allocation when a network structure adopts a 7-cell model;
fig. 6 is a flowchart of the distributed interference coordination in step 202 in fig. 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The main idea of the invention is as follows: aiming at the condition that the existing semi-static interference coordination method cannot be suitable for the unbalanced load distribution of each cell, the invention introduces an active bandwidth concept when configuring frequency resources for each cell, the active bandwidth is the frequency resource which can be shared and used by a plurality of cells in the reserved resources, and each cell can dynamically adjust the size of the active bandwidth used by the cell according to the actual needs of the cell, so that the frequency resource used by each cell can dynamically change along with the change of the cell load, thereby effectively realizing the interference coordination under the scene of uneven load distribution of each cell.
Therefore, the problem that the reserved resource for interference coordination of each cell cannot be changed to cause incapability of being suitable for the scene with uneven load distribution of each cell in the prior art can be reasonably solved.
Active bandwidth is a logical concept that can be deployed very flexibly in real spectrum. For example, each cell may share a part of the active bandwidth (see fig. 1-a), or each cell may divide a part of the active bandwidth (see fig. 1-b, c), and for the latter, the active bandwidth may be allocated continuously (see fig. 1-b) or discretely (see fig. 1-c). It is relatively simple to implement continuous active bandwidth allocation, and it is difficult to implement discrete active bandwidth allocation, but extra frequency diversity gain can be obtained, and the specific selection of which mode can be determined according to actual needs.
In addition, the use of the active bandwidth may be hierarchical, that is, different inactive bandwidth parts may use the active bandwidth according to a certain priority order, so that the occurrence of the situation of frequency resource reuse may be maximally avoided in the process of using the active bandwidth, and thus, the possibility of interference may be minimized.
As shown in fig. 2, a semi-static interference coordination method according to a first embodiment of the present invention mainly includes the following steps:
It should be noted that, in practical application, when the system is in an initial state, the frequency resources configured for the cell by the base station according to the preset frequency allocation policy include not only the frequency resources used by the central area and the interference coordination reserved resources used by the edge area configured in the prior art, but also active bandwidth resources. Here, by introducing the configuration of the active bandwidth, the system can then implement distributed interference coordination by adjusting the size of the active bandwidth of the cell according to the actual needs of the cell.
The frequency allocation policy is:
for a network structure adopting an N cell model, the method is based on a formula
Anddetermining interference coordination reserved resource f of each celliAnd an active bandwidth Ai；
Wherein,
i is more than 0 and less than or equal to N, j is more than 0 and less than or equal to N, i is not equal to j, and F is a total interference coordination reserved resource of the system; a is the total active bandwidth of the system; f. ofiCoordinating frequency resources for interference allocated to an ith cell of the N neighboring cells; a. theiIs the active bandwidth allocated to the ith cell of the N neighboring cells.
Through the frequency allocation strategy, the interference coordination reserved resources, the active bandwidth resources and the interference coordination reserved resources and the active bandwidth resources configured in the N adjacent cells are not overlapped with each other.
For example, when N is 3, that is, the network structure adopts a 3-cell model, the frequency resources may be configured for the cell as shown in fig. 3. In this model, the edge of the ith cellThe region may reserve resource f using interference coordinationiAnd corresponding active bandwidth resource aiWherein i is 1, 2, 3. The center region of a cell may use frequency resources other than its edge cells. In this model, the active bandwidth may be shared by three cells, may be independently used by continuously allocated cells, or may be independently used by discretely allocated cells.
When N is 7, that is, the network structure adopts a 7-cell model, the frequency resources can be configured for the cell as shown in fig. 4. In the model, the edge area of the ith cell can reserve the resource f by using interference coordinationiAnd corresponding active bandwidth resource aiWherein i is 1, 2, …, 7. The center region of the cell may use frequency resources other than the edge cells. In this model, the active bandwidth may be shared by seven cells, or may be used independently by continuously allocated cells, or may be used independently by discretely allocated cells.
When N is 7, that is, the network structure adopts a 7-cell model, frequency resources can also be configured for a cell as shown in fig. 5. The cell load condition in the model has the symmetrical characteristic, so a symmetrical division mode can be adopted on the interference coordination reserved resource and the active bandwidth division. The edge region of the ith cell can reserve the resource f by using interference coordinationiAnd corresponding active bandwidth resource aiWherein i is 1, 2, 3. The cell center region may use frequency resources other than the edge cells. In this model, the active bandwidth may be shared by seven cells, or may be used independently by continuously allocated cells, or may be used independently by discretely allocated cells.
Through the step, the base station can realize interference coordination through a joint interference or distributed interference coordination process according to the actual interference level. Because the joint interference coordination process is realized by reducing the used frequency resources, reducing the transmitting power and other operations, the system throughput is reduced, the signaling overhead is large, but the interference level between adjacent cells is effectively reduced, and the signal-to-noise ratio is improved; while distributed interference coordination is simple to implement relative to joint interference coordination, interference avoidance can be performed only to a certain extent. The step can effectively combine the advantages of the two modes to realize interference coordination. Specifically, after entering a cell interference measurement and reporting phase, when interference coordination is required, the UE firstly performs distributed interference coordination, and initiates a joint interference coordination process by sending a joint interference coordination request to a neighboring cell base station when the distributed interference coordination is invalid.
The joint interference coordination process may be:
the base station sends a joint interference coordination request received from a base station of an adjacent cell to a known service node; and the service node performs joint optimization allocation of resources according to the received joint interference coordination request message.
Here, the serving node may be a mobility management entity, a serving gateway, or a base station pre-designated by the system; the method for the service node to perform the joint optimization allocation of the resources mainly comprises the following steps: the used frequency resources are reduced, the transmission power is reduced, and the like, and the specific method can be realized by adopting the existing method, and is not described herein again.
The specific process of the distributed interference coordination includes:
601, a base station determines an interference level of a cell where the UE is located according to a currently received interference measurement report sent by the UE;
here, the specific method for determining the interference level of the cell in which the UE is located may be implemented by using the prior art, and is not described herein again.
here, when the interference level is determined to be greater than the preset maximum interference threshold, which indicates that the current interference level is beyond the range allowed by the system, the active bandwidth of the cell is increased through step 603 to reduce the interference level; when the interference level is not greater than the preset maximum interference threshold value, it is determined that the current interference level is within the range allowed by the system, and at this time, the active bandwidth of the cell does not need to be increased, but in order to efficiently utilize the active bandwidth resources, it is also determined whether it is necessary to further release part of the active bandwidth resources by following the principle of "timely release and appropriate occupancy" through step 606, so as to reduce the occupancy of the active bandwidth as much as possible on the premise of satisfying the requirements.
603, increasing the active bandwidth of the cell according to a preset active bandwidth adjustment strategy, and adding one to the distributed interference coordination counter;
here, by introducing the distributed interference coordination counter, it may be prevented that the distributed interference coordination continues when the interference cannot be effectively avoided, so as to avoid waste of system resources.
Actually, the distributed interference coordination counter represents a compromise between distributed interference coordination and centralized interference coordination (i.e., joint interference coordination), and in practical application, the respective proportions of the distributed interference coordination and the centralized interference coordination in the interference coordination process can be adjusted by setting the threshold value of the distributed interference coordination counter according to actual needs. For example, when the threshold value is set to be smaller, the proportion occupied by the distributed interference coordination control is reduced, and the proportion occupied by the centralized interference coordination control is increased, that is, if the distributed interference coordination cannot reduce the interference quickly, the joint interference coordination of multiple cells is initiated; similarly, when the threshold is set to be relatively large, the proportion of distributed interference coordination control is increased, and the proportion of centralized interference coordination control is reduced, that is, distributed interference coordination can try to reduce interference within a relatively long time, and after the long-time attempt fails, joint interference coordination of multiple cells is initiated.
Here, the active bandwidth adjustment policy may be:
the adjustment step length of the active bandwidth is kept unchanged, the adjustment period for increasing the active bandwidth is set to be longer, and the adjustment period for reducing the active bandwidth is set to be shorter; or,
the adjustment period of the active bandwidth remains unchanged, the setting of the adjustment step length for increasing the active bandwidth is smaller, and the setting of the adjustment step length for decreasing the active bandwidth is larger.
In the active bandwidth adjustment strategy, the adjustment step size determines the amplitude of single adjustment, and the adjustment period determines the time length of single adjustment. When the adjustment period is kept unchanged, the adjustment period is lengthened, or when the adjustment period is kept unchanged, the adjustment period is set to be smaller, so that the single adjustment speed is slower; and when the adjustment period is kept unchanged, the adjustment period is shortened, or when the adjustment period is kept unchanged, the adjustment period is set to be larger, so that the single adjustment speed is higher. The active bandwidth adjustment strategy can make the increasing speed of the active bandwidth slower and the decreasing speed of the active bandwidth faster. Here, by making the increasing speed of the active bandwidth slower, it is possible to avoid the situation that the same resource is simultaneously used, which is likely to occur when the increasing speed of the active bandwidth is fast, and interference occurs, because the same resource is simultaneously used, so making the increasing speed of the active bandwidth slower can avoid increasing the interference level of the system. The method is favorable for ensuring the existing communication quality of the edge users to the maximum extent in the process of realizing interference coordination. In addition, because no interference is introduced when the active bandwidth is reduced, the reduction speed of the active bandwidth is faster, so that the resources are ensured to be released faster, and the throughput of the system is further improved.
In practical application, the adjustment step length and the adjustment period of each cell can be flexibly set according to the interference level. For example, the active bandwidth adjustment step size and period of the current cell may be obtained by looking up a parameter table. After obtaining the interference level of the cell through the UE, the base station may quantize the interference level and compare the quantized interference level with a parameter table, where the parameter table provides recommended adjustment step lengths and adjustment periods at different interference levels, and after comparing, the base station selects an adjustment step length and an adjustment period of the active bandwidth suitable for the cell, and adjusts the active bandwidth.
this step is used to determine whether the interference level needs to be reduced by joint interference coordination. Specifically, when the distributed interference coordination counter is greater than the preset maximum interference threshold value, it indicates that the distributed interference coordination cannot effectively reduce the interference level to a level that can be accepted by the system at this time, a joint interference process needs to be initiated through step 605, and when the distributed interference coordination counter is not greater than the preset maximum interference threshold value, it indicates that the distributed interference coordination process can be further continuously utilized, that is, the process returns to step 202.
here, the execution of the joint interference coordination process is triggered by the joint interference request, that is, the adjacent cell base station initiates the joint interference coordination process after receiving the joint interference request.
here, when the interference level is smaller than a preset minimum interference threshold, it indicates that if the cell has an active bandwidth, the interference level still meets the system requirement after the active bandwidth is appropriately reduced, and at this time, the active bandwidth of the cell may be further reduced;
In the step, the configuration of the active bandwidth of the cell is more reasonable by reducing the active bandwidth, and the principle of 'timely release and appropriate occupation' is met, so that on one hand, the utilization rate of the active bandwidth resources of the system can be improved, and on the other hand, more available active bandwidth resources can be provided for the cell with larger load and higher interference level, and thus, the interference coordination under the condition of unbalanced system load is realized.
In the specific process of the distributed interference coordination, it can be seen that in the embodiment of the present invention, only when the interference level is greater than the preset maximum interference threshold or less than the preset minimum interference threshold, the corresponding active bandwidth is adjusted or joint interference coordination is initiated, instead of adjusting the active bandwidth at every moment. Therefore, the interference coordination method of the invention is semi-static, so that interference coordination can be carried out to a greater extent with less system overhead, thereby enabling the interference level of adjacent users to meet the system requirements.
According to the technical scheme, the semi-static interference coordination method provided by the invention introduces the concept of active bandwidth when the frequency resources are configured for each cell, so that the frequency resources used by each cell can dynamically change along with the change of the cell load, and the interference coordination can be effectively realized not only in the scene that the load distribution of each cell is uniform, but also in the scene that the load distribution of each cell is non-uniform. In addition, the invention sends the joint interference coordination request to the base station of the adjacent cell when the distributed interference coordination is invalid, so that the distributed interference coordination and the joint interference coordination are effectively combined in the invention, and the system overhead is reduced as much as possible on the premise of effectively reducing the interference level between the adjacent cells.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for semi-static interference coordination, the method comprising:
a. when the system is in an initial state, each base station configures frequency resources for the cell according to a preset frequency allocation strategy, wherein the frequency resources comprise active bandwidths;
b. after User Equipment (UE) enters a cell interference measurement and reporting stage, when a base station to which the UE belongs receives a joint interference coordination request sent by an adjacent cell base station, executing a joint interference coordination process; and when the base station to which the UE belongs receives an interference measurement report sent by the UE, executing a distributed interference coordination process according to the interference measurement report and the active bandwidth of the cell.
2. The method of claim 1, wherein the frequency allocation policy is:
for a network structure adopting an N cell model, the method is based on a formula
And
determining interference coordination reserved resource f of each celliAnd an active bandwidth Ai；
Wherein,
i is more than 0 and less than or equal to N, j is more than 0 and less than or equal to N, i is not equal to j, and F is a total interference coordination reserved resource of the system; a is the total active bandwidth of the system; f. ofiCoordinating frequency resources for interference allocated to an ith cell of the N neighboring cells; a. theiIs the active bandwidth allocated to the ith cell of the N neighboring cells.
3. The method of claim 1, wherein the distributed interference coordination is:
x1, the base station determines the interference level of the cell where the UE is located according to the currently received interference measurement report sent by the UE;
x2, judging whether the interference level is larger than a preset maximum interference threshold value, if so, executing a step x3, otherwise, executing a step x 6;
x, according to a preset active bandwidth adjusting strategy, increasing the active bandwidth of the cell and adding one to a distributed interference coordination counter;
x4, judging whether the distributed interference coordination counter is larger than a preset maximum interference threshold value, if so, executing a step x 5; otherwise, returning to execute the step b;
x5, sending a joint interference request to the adjacent cell base station, and returning to execute the step b;
x6, judging whether the interference level is smaller than a preset minimum interference threshold value, if so, executing a step x7, otherwise, setting the distributed interference coordination counter to zero, and returning to execute the step b;
x7, judging whether the cell has an active bandwidth, if so, executing a step x8, otherwise, returning to execute the step b;
x8, reducing the active bandwidth of the cell according to the preset active bandwidth adjusting strategy, and returning to execute the step b.
4. The method of claim 1, wherein the joint interference coordination is:
the base station sends a joint interference coordination request received from a base station of an adjacent cell to a known service node;
and the service node performs joint optimization allocation of resources according to the received joint interference coordination request message.
5. The method of claim 4, wherein the serving node is a mobility management entity, a serving gateway, or a base station pre-designated by a system.
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Cited By (8)
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| CN101982991A (en) * | 2010-11-16 | 2011-03-02 | 西安电子科技大学 | Heterogeneous service QoS based LTE network inter-cell interference ordination method |
| CN102223645A (en) * | 2011-05-31 | 2011-10-19 | 北京邮电大学 | Interference coordination self-optimizing method of cellular mobile communication system |
| CN102348216A (en) * | 2010-07-31 | 2012-02-08 | 华为技术有限公司 | Interference processing method and device |
| CN102480735A (en) * | 2010-11-26 | 2012-05-30 | 中兴通讯股份有限公司 | Method and device for allocating frequency resources in fractional frequency reuse (FFR) system |
| CN102740301A (en) * | 2011-04-12 | 2012-10-17 | 中兴通讯股份有限公司 | Inter cell interference coordination (ICIC) method and apparatus thereof |
| CN102802162A (en) * | 2012-08-08 | 2012-11-28 | 西安交通大学 | Distributed interference coordination method for improving performance of cell edge users |
| CN102843694A (en) * | 2011-06-20 | 2012-12-26 | 普天信息技术研究院有限公司 | Control information sending method and device |
| CN102970759A (en) * | 2011-09-01 | 2013-03-13 | 中兴通讯股份有限公司 | Neighborhood disturbance treatment method and device |
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| CN101310554B (en) * | 2006-08-22 | 2012-07-04 | 华为技术有限公司 | Wireless resource redistribution when switching |
| WO2008120159A2 (en) * | 2007-03-30 | 2008-10-09 | Nokia Corporation | System and method for self-optimization of interference coordination in communication systems |
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| CN101982991B (en) * | 2010-11-16 | 2013-01-23 | 西安电子科技大学 | Heterogeneous service QoS based LTE network inter-cell interference ordination method |
| CN101982991A (en) * | 2010-11-16 | 2011-03-02 | 西安电子科技大学 | Heterogeneous service QoS based LTE network inter-cell interference ordination method |
| CN102480735A (en) * | 2010-11-26 | 2012-05-30 | 中兴通讯股份有限公司 | Method and device for allocating frequency resources in fractional frequency reuse (FFR) system |
| CN102740301A (en) * | 2011-04-12 | 2012-10-17 | 中兴通讯股份有限公司 | Inter cell interference coordination (ICIC) method and apparatus thereof |
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| CN102970759A (en) * | 2011-09-01 | 2013-03-13 | 中兴通讯股份有限公司 | Neighborhood disturbance treatment method and device |
| CN102970759B (en) * | 2011-09-01 | 2018-02-13 | 中兴通讯股份有限公司 | Neighborhood disturbance treatment method and device |
| CN102802162B (en) * | 2012-08-08 | 2014-12-10 | 西安交通大学 | Distributed interference coordination method for improving performance of cell edge users |
| CN102802162A (en) * | 2012-08-08 | 2012-11-28 | 西安交通大学 | Distributed interference coordination method for improving performance of cell edge users |
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