CN107396444B - Method and device for dynamically adjusting carrier of small cell - Google Patents
Method and device for dynamically adjusting carrier of small cell Download PDFInfo
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- CN107396444B CN107396444B CN201610327582.3A CN201610327582A CN107396444B CN 107396444 B CN107396444 B CN 107396444B CN 201610327582 A CN201610327582 A CN 201610327582A CN 107396444 B CN107396444 B CN 107396444B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
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- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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Abstract
The embodiment of the application provides a method for dynamically adjusting a carrier of a small cell, which comprises the following steps: when the interference information of the target small cell is larger than a preset upper interference threshold and the load information is lower than a preset lower load threshold, deleting a first carrier in the working carrier set of the target small cell; the first carrier is an overlapped carrier between the target small cell and the adjacent cell thereof; when the interference information of the target small cell is larger than a preset interference upper threshold and the load information is higher than a preset load working threshold, deleting a second carrier in the working carrier set of each neighboring cell of the target small cell; the second carrier is an overlapped carrier between each adjacent cell and the target small cell; and when the load information of the target small cell is higher than a preset upper load threshold, adding carriers to the working carrier set of the target small cell. According to the load information and the interference information of the adjacent small cells, the carrier resource allocation of the small cells is dynamically adjusted, so that the carriers among the small cells are staggered as much as possible, and the interference among the small cells is reduced.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for dynamically adjusting a carrier of a small cell.
Background
With the rapid development of mobile broadband technology, various intelligent terminals bring about the blowout type growth of data services. Meanwhile, higher and higher data traffic is concentrated in various indoor and outdoor hot spot scenes. Traditional macro base stations encounter network establishment and coverage bottlenecks, and operators turn more attention to Small cells (Small cells) in order to achieve deep coverage and capacity improvement of the network and simultaneously consider cost effects. The small cell can fulfill the requirements of providing high data rate traffic with high quality of service and low cost well.
In LTE (Long Term Evolution) spectrum planning, TD-LTE (Time division Long Term Evolution) small cells may use some frequency bands with larger bandwidth, such as Band42 frequency Band, and in 3GPP R12(3rd Generation Partnership Project Release 12, third Generation Partnership Project 12 edition), the Band42 frequency Band may support CA (Carrier Aggregation) of 100MHz, that is, each small cell may support 5 carriers of 20 MHz. For small cells supporting a multi-carrier frequency band, in the prior art, carriers of each small cell are generally statically configured, and frequencies used by adjacent small cells are staggered, so that inter-frequency networking is realized, and interference between the cells is eliminated.
In the prior art, although co-channel interference between small cells can be solved, carrier resources used by each small cell are limited, and the utilization rate of spectrum resources is low, so that the peak rate of users and the throughput of the cells are limited. For example, in a scenario where a current network uses a Band42 frequency Band and uses a micro station for continuous coverage, if one small cell has 5 neighboring cells and an available bandwidth is 100MHz, each small cell can only use one 20MHz carrier to completely avoid interference between the small cells, so that the spectrum utilization rate of the small cells is very low.
Meanwhile, since the load of each small cell is time-varying and the small cell coverage is small, the cell load of each small cell is unbalanced. The carrier resources of each small cell are fixedly configured in the prior art, and the load state of the small cells is difficult to adapt, so that the wireless resources of some small cells are excessive, and meanwhile, the wireless resources of some small cells are insufficient, and the user experience of the small cells with insufficient wireless resources is seriously influenced.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a method for dynamically adjusting a carrier of a small cell and a corresponding device for dynamically adjusting a carrier of a small cell, so as to solve the problems of low spectrum utilization and unbalanced resource allocation of a small cell.
In order to solve the above problem, an embodiment of the present application discloses a method for dynamically adjusting a carrier of a small cell, where the small cell has an active carrier set, and the method includes:
acquiring interference information and load information of a target small cell;
when the interference information of the target small cell is larger than a preset upper interference threshold and the load information is lower than a preset lower load threshold, deleting a first carrier in the working carrier set of the target small cell; the first carrier is an overlapped carrier between the target small cell and a neighboring cell thereof;
when the interference information of the target small cell is greater than a preset interference upper threshold and the load information is greater than a preset load working threshold, deleting a second carrier in the working carrier set of each neighboring cell of the target small cell; the second carrier is an overlapped carrier between each neighboring cell and the target small cell;
and when the load information of the target small cell is higher than a preset upper load threshold, adding carriers to the working carrier set of the target small cell.
Preferably, the step of deleting the first carrier in the working carrier set of the target small cell includes:
determining the number of overlapping carriers between the target small cell and each neighboring cell thereof;
acquiring the number of allocated carriers of the target small cell;
determining the number of carriers required by the target small cell by adopting a preset load working threshold of the target small cell;
comparing the difference between the number of the allocated carriers and the number of the required carriers with the number of the overlapped carriers, and taking a smaller value as the number of the carrier which can be deleted;
and deleting the overlapped carriers with the number of the deletable carriers in the working carrier set of the target small cell.
Preferably, the step of deleting the second carrier in the working carrier set of each neighboring cell of the target small cell includes:
determining a target overlapping neighbor cell which overlaps with the carrier of the target small cell and has load information lower than a corresponding cell load lower threshold;
determining the number of overlapped carriers between the target overlapped adjacent cell and each adjacent cell thereof;
acquiring the number of allocated carriers of the target overlapping adjacent region;
determining the corresponding required carrier number by adopting a preset load working threshold corresponding to the target overlapping adjacent region;
comparing the difference value between the number of the allocated carriers corresponding to the target overlapping adjacent region and the number of the corresponding required carriers with the number of the corresponding overlapping carriers, and taking a smaller numerical value as the number of the corresponding carrier which can be deleted;
and concentrating the working carriers of the target overlapping adjacent cell, and deleting the corresponding overlapping carriers with the deletable carrier number.
Preferably, the target small cell further has a maximum carrier set, and the number of carriers in the working carrier set is smaller than that in the maximum carrier set;
the step of adding carriers to the working carrier set of the target small cell comprises:
calculating the number of available carriers of the target small cell and the number of expected carriers; the available carrier is a carrier which is in the maximum carrier set of the target small cell, has zero carrier overlapping degree and is continuous in frequency with the carrier in the current working carrier set of the target small cell or the working carrier set after the available carrier is increased; the expected carrier number is the difference value between the required carrier number and the allocated carrier number of the target small cell;
and when the number of available carriers is greater than or equal to the expected number of carriers, increasing the available carriers of the expected number of carriers in the working carrier set of the target small cell.
Preferably, the step of adding carriers to the working carrier set of the target small cell further includes:
when the number of the available carriers is smaller than the expected number of the carriers and the number of the available carriers is not zero, adding all the available carriers in the working carrier set of the target cell;
adding a first number of carriers which have smaller carrier overlapping degree and are continuous with the frequency of the carriers in the current working carrier set to the working carrier set of the target cell in the maximum carrier set of the target cell; the first number is a difference between the desired number of carriers and the available number of carriers.
Preferably, the step of adding carriers to the working carrier set of the target small cell further includes:
when the number of the available carriers is less than the expected number of the carriers and the number of the available carriers is zero, adding a second number of carriers, which have smaller carrier overlapping degree and are continuous with the frequency of the carriers in the current working carrier set, into the working carrier set of the target cell in the maximum carrier set of the target cell; the second number is the desired number of carriers.
Preferably, the target small cell further has a minimum carrier set, and the number of carriers in the working carrier set is greater than the number of carriers in the minimum carrier set.
Meanwhile, the application also discloses a carrier dynamic adjustment device for the small cell, wherein the small cell has an operating carrier set, and the device includes:
the information acquisition module is used for acquiring the interference information and the load information of the target small cell;
a first carrier deleting module, configured to delete a first carrier in the working carrier set of the target small cell when the interference information of the target small cell is greater than a preset upper interference threshold and the load information is lower than a preset lower load threshold; the first carrier is an overlapped carrier between the target small cell and a neighboring cell thereof;
a second carrier deleting module, configured to delete a second carrier in the working carrier set of each neighboring cell of the target small cell when the interference information of the target small cell is greater than a preset interference upper threshold and the load information is greater than a preset load working threshold; the second carrier is an overlapped carrier between each neighboring cell and the target small cell;
and the carrier increasing module is used for increasing carriers to the working carrier set of the target small cell when the load information of the target small cell is higher than a preset load upper threshold.
Preferably, the first carrier deletion module further includes:
a first overlapping carrier number determining submodule, configured to determine the number of overlapping carriers between the target small cell and each neighboring cell thereof;
a first allocated carrier number obtaining sub-module, configured to obtain the allocated carrier number of the target small cell;
a first required carrier number determining submodule, configured to determine a required carrier number of the target small cell by using a preset load working threshold of the target small cell;
a first deletable carrier number determining submodule for comparing the difference between the allocated carrier number and the required carrier number with the number of the overlapped carriers, and taking a smaller value as the deletable carrier number;
and the first deleting submodule is used for deleting the overlapped carriers of which the number is the number of the deletable carriers in the working carrier set of the target small cell.
Preferably, the second carrier deletion module further includes:
a target overlapping neighbor cell determining submodule, configured to determine a target overlapping neighbor cell that overlaps with a carrier of the target small cell and has load information lower than a corresponding cell load lower threshold;
a second overlapped carrier wave number determining submodule for determining the number of overlapped carriers between the target overlapped adjacent region and each adjacent region;
a second allocated carrier number obtaining submodule, configured to obtain the allocated carrier number of the target overlapping neighboring cell;
a second required carrier number determining submodule, configured to determine a corresponding required carrier number by using a preset load working threshold corresponding to the target overlapping neighboring cell;
a second deletable carrier number determining submodule, configured to compare a difference between the number of allocated carriers corresponding to the target overlapping neighboring cell and the number of required carriers corresponding to the target overlapping neighboring cell, and take a smaller value as the corresponding deletable carrier number;
and the second deleting submodule is used for deleting the overlapped carriers of the corresponding number of the deletable carriers in the working carrier set of the target overlapped adjacent cell.
Preferably, the target small cell further has a maximum carrier set, and the number of carriers in the working carrier set is smaller than that in the maximum carrier set;
the carrier increasing module further comprises:
the carrier number calculating submodule is used for calculating the available carrier number and the expected carrier number of the target small cell; the available carrier is a carrier which is in the maximum carrier set of the target small cell, has zero carrier overlapping degree and is continuous in frequency with the carrier in the current working carrier set of the target small cell or the working carrier set after the available carrier is increased; the expected carrier number is the difference value between the required carrier number and the allocated carrier number of the target small cell;
a first available carrier increasing sub-module, configured to increase the available carriers of the desired number of carriers in the working carrier set of the target small cell when the number of available carriers is greater than or equal to the desired number of carriers.
Preferably, the carrier increasing module further includes:
a second available carrier increasing sub-module, configured to increase all available carriers in the working carrier set of the target cell when the number of available carriers is less than the expected number of carriers and the number of available carriers is not zero;
a first non-available carrier increasing sub-module, configured to increase a first number of carriers, which are less in carrier overlapping degree and consecutive in frequency to carriers in a current working carrier set, to a working carrier set of the target cell in a maximum carrier set of the target cell; the first number is a difference between the desired number of carriers and the available number of carriers.
Preferably, the carrier increasing module further includes:
a second non-available carrier increasing sub-module, configured to, when the number of available carriers is less than the expected number of carriers and the number of available carriers is zero, increase a second number of carriers, which are continuous with the frequencies of the carriers in the current working carrier set and have a smaller carrier overlapping degree in the maximum carrier set of the target cell, to the working carrier set of the target cell; the second number is the desired number of carriers.
Preferably, the target small cell further has a minimum carrier set, and the number of carriers in the working carrier set is greater than the number of carriers in the minimum carrier set.
The embodiment of the application has the following advantages:
according to the embodiment of the application, the carrier resource allocation of the small cells is dynamically adjusted according to the load information and the interference information of the adjacent small cells, so that the carriers among the small cells are staggered as much as possible, and the interference among the small cells is reduced. Meanwhile, the carrier resource allocation of each small cell is self-adaptive to the cell load state, so that the frequency spectrum resource utilization rate and the user experience are improved.
When the interference information of the small cell is larger than the preset upper interference threshold and the load information is lower than the preset lower load threshold, the carrier waves which are concentrated by the working carrier waves of the small cell and are overlapped with the adjacent cell are deleted, so that the carrier wave resources occupied by the small cell are reduced, and the resource occupation is more balanced. Meanwhile, the interference of overlapped carriers between the target small cells and the adjacent cells of the target small cells is reduced, and the carriers between the small cells are staggered as much as possible.
And when the interference information of the small cell is greater than the preset interference upper threshold and the load information is greater than the preset load working threshold, deleting the carrier waves which are overlapped with the small cell and concentrated by the working carrier waves of the adjacent cells of the small cell so as to reduce the interference of the overlapped carrier waves between other adjacent cells and the target small cell and ensure that the carrier waves among the small cells are staggered as much as possible. Meanwhile, the target small cell can select more carrier resources, so that the resource occupation is more balanced.
When the load information of the small cell is higher than the preset upper load threshold, a carrier is added to the working carrier set of the small cell, the available carrier resources of the small cell are increased, and the user experience in the small cell is guaranteed.
Drawings
Fig. 1 is a flowchart illustrating steps of embodiment 1 of a method for dynamically adjusting a carrier of a small cell according to the present application;
fig. 2 is a flowchart of steps of embodiment 2 of a method for dynamically adjusting carriers of a small cell according to the present application;
fig. 3 is a schematic diagram of an embodiment of a method for dynamically adjusting carriers of small cells in a distributed architecture according to the present application;
fig. 4 is a schematic diagram of an embodiment of a method for dynamically adjusting carriers of small cells under a centralized architecture according to the present application;
fig. 5 is a block diagram illustrating an embodiment of a dynamic carrier adjustment apparatus for a small cell according to the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
One of the core ideas of the embodiment of the present application is to dynamically adjust the carrier resource allocation of small cells according to the load information and the interference information of adjacent small cells, so that carriers between small cells are staggered as much as possible, thereby achieving the purpose of reducing interference between small cells, and simultaneously, making the carrier resource allocation of each small cell self-adapt to the cell load state thereof, thereby improving the spectrum resource utilization rate and user experience.
Referring to fig. 1, a flowchart illustrating steps of embodiment 1 of a method for dynamically adjusting a carrier of a small cell according to the present application is shown, where the small cell has an active carrier set, and the method specifically includes the following steps:
in the case that a small cell may use a larger bandwidth, the small cell may employ a multi-carrier frequency band. In an available frequency Band (for example, a Band42 frequency Band), a carrier group which is composed of a plurality of carriers and has continuous frequency and is available for CA carrier aggregation is used as a carrier set. For example, for example: if CA supports 5 carrier aggregation f1, f2, f3, f4, f5, then f1, f2, f1, f2, f3, f2, f3, f4, f4, f5, etc. are all valid sets of carriers. Wherein f1, f2, f3, f4 and f5 are continuous-frequency carriers.
CA is introduced in the Release 10 stage for 3GPP, and aggregates a plurality of continuous or discontinuous carriers into a larger bandwidth, so that when the resources of the whole network are not fully occupied, the utilization rate of the resources of the whole network can be greatly improved, and the peak rate experience of a user is improved; meanwhile, the utilization rate of the discrete spectrum can be improved by carrier aggregation.
In the embodiment of the present application, an active carrier set is configured for each small cell, and the active carrier set is a carrier group that can be actually used by the small cell.
The interference information is the interference strength of the small cell interfered by other small cells. The load information may be represented by the throughput of the small cell.
102, when the interference information of the target small cell is greater than a preset upper interference threshold and the load information is lower than a preset lower load threshold, deleting a first carrier in a working carrier set of the target small cell; the first carrier is an overlapped carrier between the target small cell and a neighboring cell thereof;
the interference upper threshold is the maximum value of the allowable interference strength of the set small cell.
The threshold under load is the minimum value that the load working threshold of the cell can set. The load working threshold is the set load amount which can be processed by the current cell.
When the load information of the target small cell is lower than the preset lower load threshold, the target small cell can be considered to not occupy too much carrier resources, so that overlapped carriers concentrated by the working carrier of the target small cell and adjacent cells of the target small cell can be deleted, carriers among the small cells can be staggered as much as possible, and interference of the overlapped carriers among the target small cells and the adjacent cells of the target small cell is reduced. Meanwhile, other small cells with larger load can select more carrier resources, so that the resource occupation is more balanced.
The overlapped carrier refers to the same carrier among the carriers allocated and used by the small cell and the carriers allocated and used by the neighboring cell.
103, when the interference information of the target small cell is greater than a preset interference upper threshold and the load information is greater than a preset load working threshold, deleting a second carrier in the working carrier set of each neighboring cell of the target small cell; the second carrier is an overlapped carrier between each neighboring cell and the target small cell;
and when the interference information of the target small cell is greater than a preset interference upper threshold and the load information is greater than a preset load working threshold, deleting the carrier waves which are overlapped with the target small cell and are concentrated by the working carrier waves of the adjacent cells with overlapped carrier waves with the target small cell so as to reduce the interference of the overlapped carrier waves between other adjacent cells and the target small cell. Meanwhile, the carrier resources occupied by the adjacent cells are reduced, so that more carrier resources can be selected by the target small cell, and the resource occupation is more balanced.
And 104, when the load information of the target small cell is higher than a preset upper load threshold, adding carriers to the working carrier set of the target small cell.
The upper load threshold is the maximum value that can be set by the load working threshold of the cell. The upper threshold of load and the lower threshold of cell load are used for limiting the upper limit and the lower limit of the distribution load quantity. The load working threshold needs to be greater than the cell load lower threshold and less than the load upper threshold.
When the load information of the target small cell is higher than the preset upper load threshold, a carrier is added to the working carrier set of the target small cell, the available carrier resources of the target small cell are increased, and the user experience in the target small cell is guaranteed.
Referring to fig. 2, a flowchart of steps of embodiment 2 of a method for dynamically adjusting a carrier of a small cell according to the present application is shown, where the small cell has an active carrier set, and the method specifically includes the following steps:
and when the interference information of the target small cell is greater than a preset upper interference threshold, determining all overlapped carriers of the target small cell and the adjacent cells, and determining all the adjacent cells with the overlapped carriers.
the allocated carriers are carriers being used by the small cell, the number of allocated carriers is the number of carriers being used by the small cell, and the carriers used by the small cell can only be selected from the active carrier group.
and determining the number of carriers which need to be allocated and used by the small cell according to the set load which can be processed by the current small cell.
and taking the smaller value between the difference value of the number of the allocated carriers minus the number of the required carriers and the number of the overlapped carriers as the number of the carrier capable of being deleted.
I.e. the number of cancelled carriers min { number of overlapping carriers, number of allocated carriers-number of carriers according to the load working threshold budget }.
And concentrating the working carriers of the target small cell, and deleting the overlapped carriers with the number of the deletable carriers.
When the load of the target small cell is low, the overlapped carrier in the working carrier set of the target small cell is deleted, so that the interference of the overlapped carriers between the target small cell and the adjacent cell is reduced, and the carriers between the small cells are staggered as much as possible. The carrier resources occupied by the target small cell are reduced, and meanwhile, other small cells with larger loads can select more carrier resources, so that the resource occupation is more balanced.
and taking the neighbor cell which has overlapped carriers with the target small cell and the load information of which is lower than the cell load lower threshold corresponding to the neighbor cell as the target overlapped neighbor cell.
and determining the number of overlapped carriers between the target overlapped adjacent cell and each adjacent cell.
the allocated carrier is the carrier which is used by the target overlapping adjacent cell.
and determining the number of the carriers which need to be distributed and used and correspond to the target overlapping adjacent cell according to the preset load working threshold corresponding to the target overlapping adjacent cell.
and taking the smaller value between the difference value of the number of the allocated carriers minus the number of the required carriers and the number of the overlapped carriers as the number of the carrier capable of being deleted.
And 212, centralizing the working carriers of the target overlapping adjacent cell, and deleting the overlapping carriers with the corresponding deletable carrier number.
And (4) concentrating the working carriers of the target overlapping adjacent cell, and deleting the overlapping carriers of which the number is the corresponding number of the deletable carriers.
When the load of the target small cell is high, the overlapped carriers in the working carrier concentration of the neighbor cell with low load in the neighbor cells are reduced, so that the interference of the overlapped carriers between other neighbor cells and the target small cell is reduced, and the carriers among the small cells are staggered as much as possible. Meanwhile, the carrier resources occupied by the adjacent cells are reduced, so that more carrier resources can be selected by the target small cell, and the resource occupation is more balanced.
As a preferred example of the embodiment of the present application, the target small cell further has a maximum carrier set, and the number of carriers in the working carrier set is less than the number of carriers in the maximum carrier set;
the step of adding carriers to the working carrier set of the target small cell in step 213 may further include the sub-steps of:
a substep S11 of calculating an available carrier number of the target small cell and an expected carrier number; the available carrier is a carrier which is in the maximum carrier set of the target small cell, has zero carrier overlapping degree and is continuous in frequency with the carrier in the current working carrier set of the target small cell or the working carrier set after the available carrier is increased; the expected carrier number is the difference value between the required carrier number and the allocated carrier number of the target small cell;
the carrier overlapping degree is defined as: for a carrier within the largest carrier set of a small cell, the number of small cells using that carrier in the small cell and its neighboring cells.
The carrier with zero carrier overlapping degree and guaranteed frequency continuity with the carrier in the current working carrier set of the target small cell or the working carrier set after increasing the available carrier is called the available carrier.
And determining the required carrier number of the small cell according to the load working threshold of the small cell. And subtracting the difference value of the allocated carrier number of the small cell from the required carrier number of the small cell to obtain the expected carrier number.
In the embodiment of the present application, a maximum carrier set is set for a target small cell, and the maximum carrier set is a set of the maximum number of carriers that can be set by an operating carrier set. The carrier number of the working carrier set is less than that of the maximum carrier set.
As a preferred example of the embodiment of the present application, the target small cell further has a minimum carrier set, and the number of carriers in the working carrier set is greater than the number of carriers in the minimum carrier set.
The minimum carrier set is a set of the minimum number of carriers that the operating carrier set can set.
The maximum carrier set and the minimum carrier set are used to limit the upper and lower limits of the allocated carrier resources, i.e. the working carrier set must contain all carriers in the minimum carrier set, but the contained carriers cannot exceed the carriers in the maximum carrier set.
Before the system of the small cell operates, it is necessary to first configure the operating carrier set, the minimum carrier set, and the maximum carrier set of the small cell by the management apparatus. If the working carrier set, the minimum carrier set and the maximum carrier set configured by the small cell are all the same, the working carrier sets of the small cell and each adjacent small cell need to be staggered as much as possible, so as to reduce the interference between the small cells. If the minimum carrier set and the maximum carrier set of the small cell configuration are not the same, the working carrier set of the small cell can be dynamically adjusted.
And a substep S12, when the number of available carriers is greater than or equal to the desired number of carriers, increasing the available carriers of the desired number of carriers in the working carrier set of the target small cell.
With the increase in available carriers, all carriers in the active set of carriers remain frequency-continuous.
And when the number of the available carriers is greater than or equal to the expected number of the carriers, increasing the available carriers of the expected number of the carriers in the working carrier set of the target small cell. When the load of the small cell is too high, the carriers concentrated by the working carriers of the small cell are increased, and the experience of users in the small cell is ensured.
As a preferred example of the embodiment of the present application, the step of adding carriers to the working carrier set of the target small cell in step 213 may further include the following sub-steps:
substep S13, when the number of available carriers is smaller than the expected number of carriers and the number of available carriers is not zero, adding all available carriers in the working carrier set of the target cell;
substep S14, adding a first number of carriers, which have a small carrier overlapping degree and are continuous with the frequencies of the carriers in the current working carrier set, to the working carrier set of the target cell in the maximum carrier set of the target cell; the first number is a difference between the desired number of carriers and the available number of carriers.
When the number of available carriers is smaller than the expected number of carriers and the number of available carriers is not zero, all available carriers are first added to the active carrier set of the target cell.
And after all available carriers with the carrier overlapping degree of zero are increased, continuously increasing the carriers with smaller carrier overlapping degree, which keep frequency continuity with the carriers in the working carrier set and have the number of difference of the expected carrier number minus the available carrier number. I.e., the sum of the number of available carriers whose increased carrier overlapping degree is zero and the number of carriers whose increased carrier overlapping degree is smaller is the desired carrier number. Under the condition of reducing the interference between the target small cell and the adjacent cell as much as possible, the carriers in the working carrier set of the target small cell are increased so as to meet the load demand of the small cell.
As a preferred example of the embodiment of the present application, the step of adding carriers to the working carrier set of the target small cell in step 213 may further include the following sub-steps:
a substep S15, when the number of available carriers is less than the expected number of carriers and the number of available carriers is zero, adding a second number of carriers, which have a smaller carrier overlapping degree and are continuous with the frequency of the carriers in the current working carrier set, to the working carrier set of the target cell in the maximum carrier set of the target cell; the second number is the desired number of carriers.
When the number of available carriers with zero carrier overlapping degree is zero, carriers with small carrier overlapping degrees are added to the working carrier set of the target small cell. Under the condition of reducing the interference between the target small cell and the adjacent cell as much as possible, the carriers in the working carrier set of the target small cell are increased so as to meet the load demand of the small cell.
At present, the building of small cells mainly comprises: the method is divided into two forms of a distributed architecture and a centralized architecture.
Fig. 3 is a schematic diagram illustrating an embodiment of a method for dynamically adjusting a carrier of a small cell in a distributed architecture according to the present application;
interference information, cell load information and carrier resource allocation information are periodically exchanged between the target small cell and each adjacent cell through an X2 interface.
And if the target small cell detects that the interference intensity is greater than the set threshold or detects that the cell load is greater than the set threshold, adjusting the carrier resource allocation of the target small cell and the adjacent cell thereof. See the previous examples for specific adjustments.
If the adjacent cell carrier resource allocation needs to be adjusted, the target small cell sends a carrier resource allocation adjustment request message to the adjacent cell through an X2 interface, and after the adjacent cell finishes the carrier resource allocation adjustment, the target small cell responds to the carrier resource allocation adjustment confirmation message.
Fig. 4 is a schematic diagram illustrating an embodiment of a method for dynamically adjusting a carrier of a small cell under a centralized architecture according to the present application;
all small cells under the control of the centralized control unit report the interference information, the load information and the carrier resource allocation information of all the small cells to the centralized control unit periodically.
If the centralized control unit detects that the interference strength of the interference information of a certain small cell is greater than a set threshold, or detects that the cell load is greater than the set threshold, the carrier resource allocation of the small cell and the adjacent cells of the small cell is adjusted. See the previous examples for specific adjustments.
If the carrier resource allocation of a certain small cell needs to be adjusted, the centralized control unit sends a carrier resource allocation adjustment request message to the small cell, and after the small cell finishes adjusting the carrier resource allocation, the centralized control unit responds to a carrier resource allocation adjustment confirmation message.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the embodiments. Further, those skilled in the art will also appreciate that the embodiments described in the specification are presently preferred and that no particular act is required of the embodiments of the application.
Referring to fig. 5, a block diagram of an embodiment of a dynamic carrier adjustment apparatus for a small cell according to the present application is shown, where the small cell has an active carrier set, and the apparatus may specifically include the following modules:
an information obtaining module 51, configured to obtain interference information and load information of a target small cell;
a first carrier deleting module 52, configured to delete a first carrier in the working carrier set of the target small cell when the interference information of the target small cell is greater than a preset upper interference threshold and the load information is lower than a preset lower load threshold; the first carrier is an overlapped carrier between the target small cell and a neighboring cell thereof;
a second carrier deleting module 53, configured to delete a second carrier in the working carrier set of each neighboring cell of the target small cell when the interference information of the target small cell is greater than a preset interference upper threshold and the load information is greater than a preset load working threshold; the second carrier is an overlapped carrier between each neighboring cell and the target small cell;
a carrier increasing module 54, configured to increase a carrier for the working carrier set of the target small cell when the load information of the target small cell is higher than a preset upper load threshold.
As a preferred example of the embodiment of the present application, the first carrier deletion module 52 may further include:
a first overlapping carrier number determining submodule, configured to determine the number of overlapping carriers between the target small cell and each neighboring cell thereof;
a first allocated carrier number obtaining sub-module, configured to obtain the allocated carrier number of the target small cell;
a first required carrier number determining submodule, configured to determine a required carrier number of the target small cell by using a preset load working threshold of the target small cell;
a first deletable carrier number determining submodule for comparing the difference between the allocated carrier number and the required carrier number with the number of the overlapped carriers, and taking a smaller value as the deletable carrier number;
and the first deleting submodule is used for deleting the overlapped carriers of which the number is the number of the deletable carriers in the working carrier set of the target small cell.
As a preferred example of the embodiment of the present application, the second carrier deleting module 53 may further include:
a target overlapping neighbor cell determining submodule, configured to determine a target overlapping neighbor cell that overlaps with a carrier of the target small cell and has load information lower than a corresponding cell load lower threshold;
a second overlapped carrier wave number determining submodule for determining the number of overlapped carriers between the target overlapped adjacent region and each adjacent region;
a second allocated carrier number obtaining submodule, configured to obtain the allocated carrier number of the target overlapping neighboring cell;
a second required carrier number determining submodule, configured to determine a corresponding required carrier number by using a preset load working threshold corresponding to the target overlapping neighboring cell;
a second deletable carrier number determining submodule, configured to compare a difference between the number of allocated carriers corresponding to the target overlapping neighboring cell and the number of required carriers corresponding to the target overlapping neighboring cell, and take a smaller value as the corresponding deletable carrier number;
and the second deleting submodule is used for deleting the overlapped carriers of the corresponding number of the deletable carriers in the working carrier set of the target overlapped adjacent cell.
As a preferred example of the embodiment of the present application, the target small cell further has a maximum carrier set, and the number of carriers in the working carrier set is less than the number of carriers in the maximum carrier set;
the carrier increasing module 54 may further include:
the carrier number calculating submodule is used for calculating the available carrier number and the expected carrier number of the target small cell; the available carrier is a carrier which is in the maximum carrier set of the target small cell, has zero carrier overlapping degree and is continuous in frequency with the carrier in the current working carrier set of the target small cell or the working carrier set after the available carrier is increased; the expected carrier number is the difference value between the required carrier number and the allocated carrier number of the target small cell;
a first available carrier increasing sub-module, configured to increase the available carriers of the desired number of carriers in the working carrier set of the target small cell when the number of available carriers is greater than or equal to the desired number of carriers.
As a preferred example of the embodiment of the present application, the carrier increasing module 54 may further include:
a second available carrier increasing sub-module, configured to increase all available carriers in the working carrier set of the target cell when the number of available carriers is less than the expected number of carriers and the number of available carriers is not zero;
a first non-available carrier increasing sub-module, configured to increase a first number of carriers, which are less in carrier overlapping degree and consecutive in frequency to carriers in a current working carrier set, to a working carrier set of the target cell in a maximum carrier set of the target cell; the first number is a difference between the desired number of carriers and the available number of carriers.
As a preferred example of the embodiment of the present application, the carrier increasing module 54 may further include:
a second non-available carrier increasing sub-module, configured to, when the number of available carriers is less than the expected number of carriers and the number of available carriers is zero, increase a second number of carriers, which are continuous with the frequencies of the carriers in the current working carrier set and have a smaller carrier overlapping degree in the maximum carrier set of the target cell, to the working carrier set of the target cell; the second number is the desired number of carriers.
As a preferred example of the embodiment of the present application, the target small cell further has a minimum carrier set, and the number of carriers in the working carrier set is greater than the number of carriers in the minimum carrier set.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method for dynamically adjusting a carrier of a small cell and the device for dynamically adjusting a carrier of a small cell provided by the present application are described in detail above, and a specific example is applied in the present application to explain the principle and the implementation of the present application, and the description of the above embodiment is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (12)
1. A method for dynamic carrier adjustment of a small cell, wherein the small cell has an active carrier set, the method comprising:
acquiring interference information and load information of a target small cell;
the method for acquiring the interference information and the load information of the target small cell comprises the following steps: acquiring interference information and load information of all small cells in a centralized manner, or periodically exchanging the interference information and the load information between the target small cell and the adjacent cell thereof;
when the interference information of the target small cell is larger than a preset upper interference threshold and the load information is lower than a preset lower load threshold, deleting a first carrier in the working carrier set of the target small cell; the first carrier is an overlapped carrier between the target small cell and a neighboring cell thereof;
when the interference information of the target small cell is greater than a preset interference upper threshold and the load information is greater than a preset load working threshold, deleting a second carrier in the working carrier set of each neighboring cell of the target small cell; the second carrier is an overlapped carrier between each neighboring cell and the target small cell;
when the load information of the target small cell is higher than a preset upper load threshold, adding carriers to a working carrier set of the target small cell;
the target small cell is also provided with a maximum carrier set, and the carrier number of the working carrier set is smaller than that of the maximum carrier set;
the step of adding carriers to the working carrier set of the target small cell comprises:
calculating the number of available carriers of the target small cell and the number of expected carriers; the available carrier is a carrier which is in the maximum carrier set of the target small cell, has zero carrier overlapping degree and is continuous in frequency with the carrier in the current working carrier set of the target small cell or the working carrier set after the available carrier is increased; the expected carrier number is the difference value between the required carrier number and the allocated carrier number of the target small cell;
and when the number of available carriers is greater than or equal to the expected number of carriers, increasing the available carriers of the expected number of carriers in the working carrier set of the target small cell.
2. The method of claim 1, wherein the step of deleting the first carrier in the set of operating carriers of the target small cell comprises:
determining the number of overlapping carriers between the target small cell and each neighboring cell thereof;
acquiring the number of allocated carriers of the target small cell;
determining the number of carriers required by the target small cell by adopting a preset load working threshold of the target small cell;
comparing the difference between the number of the allocated carriers and the number of the required carriers with the number of the overlapped carriers, and taking a smaller value as the number of the carrier which can be deleted;
and deleting the overlapped carriers with the number of the deletable carriers in the working carrier set of the target small cell.
3. The method of claim 1, wherein the step of deleting the second carrier in the set of active carriers of each neighbor cell of the target small cell comprises:
determining a target overlapping neighbor cell which overlaps with the carrier of the target small cell and has load information lower than a corresponding cell load lower threshold;
determining the number of overlapped carriers between the target overlapped adjacent cell and each adjacent cell thereof;
acquiring the number of allocated carriers of the target overlapping adjacent region;
determining the corresponding required carrier number by adopting a preset load working threshold corresponding to the target overlapping adjacent region;
comparing the difference value between the number of the allocated carriers corresponding to the target overlapping adjacent region and the number of the corresponding required carriers with the number of the corresponding overlapping carriers, and taking a smaller numerical value as the number of the corresponding carrier which can be deleted;
and concentrating the working carriers of the target overlapping adjacent cell, and deleting the corresponding overlapping carriers with the deletable carrier number.
4. The method of claim 1, wherein the step of adding carriers to the active carrier set of the target small cell further comprises:
when the number of the available carriers is less than the expected number of the carriers and the number of the available carriers is not zero, adding all the available carriers in the working carrier set of the target small cell;
adding a first number of carriers which have smaller carrier overlapping degree and are continuous with the frequency of the carriers in the current working carrier set to the working carrier set of the target small cell in the maximum carrier set of the target small cell; the first number is a difference between the desired number of carriers and the available number of carriers.
5. The method of claim 1, wherein the step of adding carriers to the active carrier set of the target small cell further comprises:
when the number of available carriers is less than the expected number of carriers and the number of available carriers is zero, adding a second number of carriers, which have smaller carrier overlapping degree and are continuous with the frequency of the carriers in the current working carrier set, into the working carrier set of the target small cell in the maximum carrier set of the target small cell; the second number is the desired number of carriers.
6. The method of claim 1, wherein the target small cell further has a minimum carrier set, and wherein the number of carriers in the active carrier set is greater than the number of carriers in the minimum carrier set.
7. An apparatus for dynamic carrier adjustment of a small cell, wherein the small cell has an active carrier set, the apparatus comprising:
the information acquisition module is used for acquiring the interference information and the load information of all small cells in a centralized manner or periodically exchanging the interference information and the load information between a target small cell and an adjacent cell thereof;
a first carrier deleting module, configured to delete a first carrier in the working carrier set of the target small cell when the interference information of the target small cell is greater than a preset upper interference threshold and the load information is lower than a preset lower load threshold; the first carrier is an overlapped carrier between the target small cell and a neighboring cell thereof;
a second carrier deleting module, configured to delete a second carrier in the working carrier set of each neighboring cell of the target small cell when the interference information of the target small cell is greater than a preset interference upper threshold and the load information is greater than a preset load working threshold; the second carrier is an overlapped carrier between each neighboring cell and the target small cell;
a carrier increasing module, configured to increase a carrier for a working carrier set of the target small cell when the load information of the target small cell is higher than a preset load upper threshold;
the target small cell is also provided with a maximum carrier set, and the carrier number of the working carrier set is smaller than that of the maximum carrier set;
the carrier increasing module further comprises:
the carrier number calculating submodule is used for calculating the available carrier number and the expected carrier number of the target small cell; the available carrier is a carrier which is in the maximum carrier set of the target small cell, has zero carrier overlapping degree and is continuous in frequency with the carrier in the current working carrier set of the target small cell or the working carrier set after the available carrier is increased; the expected carrier number is the difference value between the required carrier number and the allocated carrier number of the target small cell;
a first available carrier increasing sub-module, configured to increase the available carriers of the desired number of carriers in the working carrier set of the target small cell when the number of available carriers is greater than or equal to the desired number of carriers.
8. The apparatus of claim 7, wherein the first carrier deletion module further comprises:
a first overlapping carrier number determining submodule, configured to determine the number of overlapping carriers between the target small cell and each neighboring cell thereof;
a first allocated carrier number obtaining sub-module, configured to obtain the allocated carrier number of the target small cell;
a first required carrier number determining submodule, configured to determine a required carrier number of the target small cell by using a preset load working threshold of the target small cell;
a first deletable carrier number determining submodule for comparing the difference between the allocated carrier number and the required carrier number with the number of the overlapped carriers, and taking a smaller value as the deletable carrier number;
and the first deleting submodule is used for deleting the overlapped carriers of which the number is the number of the deletable carriers in the working carrier set of the target small cell.
9. The apparatus of claim 7, wherein the second carrier deletion module further comprises:
a target overlapping neighbor cell determining submodule, configured to determine a target overlapping neighbor cell that overlaps with a carrier of the target small cell and has load information lower than a corresponding cell load lower threshold;
a second overlapped carrier wave number determining submodule for determining the number of overlapped carriers between the target overlapped adjacent region and each adjacent region;
a second allocated carrier number obtaining submodule, configured to obtain the allocated carrier number of the target overlapping neighboring cell;
a second required carrier number determining submodule, configured to determine a corresponding required carrier number by using a preset load working threshold corresponding to the target overlapping neighboring cell;
a second deletable carrier number determining submodule, configured to compare a difference between the number of allocated carriers corresponding to the target overlapping neighboring cell and the number of required carriers corresponding to the target overlapping neighboring cell, and take a smaller value as the corresponding deletable carrier number;
and the second deleting submodule is used for deleting the overlapped carriers of the corresponding number of the deletable carriers in the working carrier set of the target overlapped adjacent cell.
10. The apparatus of claim 7, wherein the carrier adding module further comprises:
a second available carrier increasing sub-module, configured to increase all available carriers in the working carrier set of the target small cell when the number of available carriers is less than the desired number of carriers and the number of available carriers is not zero;
a first non-available carrier increasing sub-module, configured to increase a first number of carriers, which are less in carrier overlapping degree and consecutive in frequency to carriers in a current working carrier set, to a working carrier set of the target small cell in a maximum carrier set of the target small cell; the first number is a difference between the desired number of carriers and the available number of carriers.
11. The apparatus of claim 7, wherein the carrier adding module further comprises:
a second non-available carrier increasing sub-module, configured to increase, when the number of available carriers is less than the desired number of carriers and the number of available carriers is zero, a second number of carriers, which are continuous with the frequencies of the carriers in the current working carrier set and have a smaller carrier overlapping degree, to the working carrier set of the target small cell in the maximum carrier set of the target small cell; the second number is the desired number of carriers.
12. The apparatus of claim 7, wherein the target small cell further has a minimum carrier set, and wherein the number of carriers in the active carrier set is greater than the number of carriers in the minimum carrier set.
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| CN102014393B (en) * | 2010-11-22 | 2013-06-12 | 西安电子科技大学 | Frequency allocation method for multi-point coordinated transmission in cellular communication system |
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