CN108882303B - Interference avoidance method and device - Google Patents
Interference avoidance method and device Download PDFInfo
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- CN108882303B CN108882303B CN201710318809.2A CN201710318809A CN108882303B CN 108882303 B CN108882303 B CN 108882303B CN 201710318809 A CN201710318809 A CN 201710318809A CN 108882303 B CN108882303 B CN 108882303B
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Abstract
The embodiment of the invention provides an interference avoiding method and device, wherein the method comprises the following steps: the local base station detects and records the characteristic sequence of the received wireless frame; respectively counting the times corresponding to the detected characteristic sequences according to a preset period; comparing the times of each characteristic sequence with a first threshold, and determining the number of first targets of the characteristic sequences of which the times exceed the first threshold; when the first target number exceeds the number threshold value, determining that the local base station is interfered by a remote base station, and adjusting the ratio of the special subframes to a first ratio; the number threshold is used for judging whether the local base station is interfered by a remote base station, and the first proportion is proportion information of each time slot in a special subframe. Therefore, when the local base station is determined to be interfered by the remote base station according to the detected number of the characteristic sequences, the ratio of the special subframes can be automatically adjusted; the adjusting efficiency of the special subframe ratio is greatly improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an interference avoidance method and an interference avoidance apparatus.
Background
With the continuous development of communication technology, the mobile network communication technology gradually develops from the second generation mobile communication technology to the fourth generation mobile communication technology and the fifth generation mobile communication technology; and also to higher-order mobile communication technologies.
According to the physical layer frame structure of a Time Division Long Term Evolution (TD-LTE) system, the TD-LTE uses different Time slots to distinguish uplink and downlink, and is influenced by the environment such as weather and the terrain during co-frequency networking. The atmosphere waveguide phenomenon can occur under certain climates (such as 'low-altitude atmosphere waveguide' formed when the material is dry in spring and winter), terrain and environmental conditions. Under the low-altitude waveguide effect, electromagnetic waves are continuously refracted through the atmosphere, so that the propagation loss is very small, and ultra-long-distance propagation can be realized; when the downlink signal of the far-end cell crosses the guard interval time slot and falls into the near-end uplink time slot, interference is generated on the near-end cell. In the prior art, when it is determined that the local base station is interfered by the remote base station, the special subframe ratio of the local base station is manually adjusted, and the adjustment efficiency is low.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide an interference avoidance method, so as to solve the problem in the prior art that when a local base station is interfered, the adjustment efficiency of the special subframe ratio is low.
Correspondingly, the embodiment of the invention also provides an interference avoidance device, which is used for ensuring the realization and the application of the method.
In order to solve the above problems, the present invention discloses an interference avoidance method, which specifically includes: the local base station detects and records the characteristic sequence of the received wireless frame; respectively counting the times corresponding to the detected characteristic sequences according to a preset period; comparing the times of each characteristic sequence with a first threshold, and determining the number of first targets of the characteristic sequences of which the times exceed the first threshold; when the first target number exceeds the number threshold value, determining that the local base station is interfered by a remote base station, and adjusting the ratio of the special subframes to a first ratio; the number threshold is used for judging whether the local base station is interfered by a remote base station, and the first proportion is proportion information of each time slot in a special subframe.
Optionally, the radio frame includes an uplink subframe and a special subframe, and the special subframe includes an uplink pilot time slot; the local base station detects and records the characteristic sequence of the received wireless frame, and the method comprises the following steps: adopting a reference sequence to sequentially detect the characteristic sequences of an uplink pilot frequency time slot and an uplink subframe; when the characteristic sequence is detected, judging whether the characteristic sequence is recorded or not; adding 1 to the number of feature sequences when the feature sequences have been recorded; when the feature sequence is not recorded, the feature sequence is recorded, and the number of the feature sequences is set to 1.
Optionally, the method further comprises: and when the first target number is determined to be lower than the number threshold, keeping the ratio of the special subframes unchanged.
Optionally, after the step of detecting and recording the signature sequence of the received radio frame by the local base station, the method further includes: comparing the times of each characteristic sequence with a second threshold, and determining the number of second targets of the characteristic sequences with the number lower than the second threshold, wherein the first threshold is larger than the second threshold; and determining a total number of signature sequences of the record.
Optionally, after the step of determining the first target number of signature sequences whose number exceeds the first threshold, the method further comprises: judging whether the local base station is in a normal state currently or not according to the special subframe ratio of the preset period; if yes, judging whether the first target number exceeds a number threshold value; if not, judging whether the second target number is equal to the total number.
Optionally, the method comprises: when the second target number is equal to the total number, determining that the local base station is not interfered by a remote base station, and adjusting the proportion of special subframes of the base station to a second proportion, wherein the second proportion is proportion information of each time slot in the special subframes; when the second target number is not equal to the total number, keeping the special subframe ratio unchanged.
Optionally, the special subframe comprises: a downlink pilot time slot, a protection time slot and an uplink pilot time slot; the special subframe ratio is as follows: the symbol number of the downlink pilot time slot, the symbol number of the protection time slot and the proportion of the uplink pilot time slot.
The embodiment of the invention also discloses an interference avoiding device, which is applied to a base station and specifically comprises the following steps: the sequence detection module is used for detecting and recording the characteristic sequence of the received wireless frame; the number counting module is used for respectively counting the times corresponding to the detected characteristic sequences according to a preset period; the number determining module is used for comparing the times of each characteristic sequence with a first threshold and determining the number of first targets of the characteristic sequences of which the times exceed the first threshold; the first proportion adjusting module is used for determining that the local base station is interfered by the remote base station when the first target number exceeds the number threshold value, and adjusting the proportion of the special subframes to be a first proportion; the number threshold is used for judging whether the local base station is interfered by a remote base station, and the first proportion is proportion information of each time slot in a special subframe.
Optionally, the radio frame includes an uplink subframe and a special subframe, and the special subframe includes an uplink pilot time slot; the sequence detection module is specifically used for sequentially carrying out characteristic sequence detection on an uplink pilot frequency time slot and an uplink subframe by adopting a reference sequence; when the characteristic sequence is detected, judging whether the characteristic sequence is recorded or not; adding 1 to the number of feature sequences when the feature sequences have been recorded; when the characteristic sequence is not recorded, recording the characteristic sequence, and setting the number of the characteristic sequence to 1; the wireless frame comprises an uplink subframe and a special subframe, and the special subframe comprises an uplink pilot frequency time slot.
Optionally, the apparatus further comprises: and the first proportion keeping module is used for keeping the proportion of the special subframes unchanged when the first target number is determined to be lower than the number threshold.
Optionally, the apparatus further comprises: the quantity determining module is used for comparing the times of the characteristic sequences with a second threshold and determining the second target quantity of the characteristic sequences of which the quantity is lower than the second threshold, wherein the first threshold is larger than the second threshold; and determining a total number of signature sequences of the record.
Optionally, the apparatus further comprises: the judging module judges whether the local base station is in a normal state currently or not according to the special subframe ratio of the preset period; if yes, judging whether the first target number exceeds a number threshold value; if not, judging whether the second target number is equal to the total number.
Optionally, the apparatus further comprises: a second proportion adjusting module, configured to, when the second target number is equal to the total number, determine that the local base station is not interfered by the remote base station, adjust the proportion of the special subframes of the base station to a second proportion, where the second proportion is proportion information of each time slot in the special subframes; and the second proportion keeping module is used for keeping the special subframe ratio unchanged when the second target number is not equal to the total number.
Optionally, the special subframe comprises: a downlink pilot time slot, a protection time slot and an uplink pilot time slot; the special subframe ratio is as follows: the symbol number of the downlink pilot time slot, the symbol number of the protection time slot and the proportion of the uplink pilot time slot.
Compared with the prior art, the embodiment of the invention has the following advantages:
when a local base station receives a wireless frame, detecting and recording a characteristic sequence of the wireless frame; then respectively counting the times corresponding to the detected characteristic sequences according to a preset period; comparing the times of each characteristic sequence with a first threshold, and determining the number of first targets of the characteristic sequences of which the number exceeds the first threshold; the number threshold is used for judging whether the local base station is interfered by a remote base station; therefore, when the first target number exceeds the number threshold, the local base station is determined to be interfered by the remote base station, and the ratio of the special subframes is adjusted to be the first ratio. Therefore, when the local base station is determined to be interfered by the remote base station according to the detected number of the characteristic sequences, the ratio of the special subframes can be automatically adjusted; the adjusting efficiency of the special subframe ratio is greatly improved.
Drawings
FIG. 1 is a flow chart of steps of an embodiment of a method of interference avoidance of the present invention;
FIG. 2 is a flow chart of steps of another interference avoidance method embodiment of the present invention;
FIG. 3 is a block diagram of an embodiment of an interference avoidance apparatus according to the present invention;
fig. 4 is a block diagram showing another interference avoidance apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a flowchart illustrating steps of an embodiment of an interference avoidance method according to the present invention is shown, which may specifically include the following steps:
According to the interference avoiding method provided by the embodiment of the invention, when the local base station is determined to receive the interference of the remote base station, the matching of the special subframes is automatically carried out so as to avoid the interference of the remote base station; the method comprises the steps that a disturbed base station is determined as a local base station, and an interfering base station is determined as a far-end base station; the interference between the local base station and the remote base station is mutual, namely, the downlink of the remote base station causes the interference to the uplink of the local base station, and the downlink of the local base station also causes the interference to the uplink of the remote base station; therefore, the same base station in the embodiment of the present invention may be a local base station or a remote base station. When any base station is determined to be interfered, the characteristic sequence of the base station is continuously sent through a downlink wireless frame; meanwhile, downlink radio frames sent by the base station also cause interference to other base stations; therefore, any base station can determine whether to be interfered according to the detected characteristic sequence by detecting the characteristic sequence of the wireless frame; and recording the detected characteristic sequence. The characteristic sequence is the physical cell ID of the base station, the characteristic sequences of different base stations are different, and the characteristic sequences of different cells of the same base station are also different.
And 102, respectively counting the times corresponding to the detected characteristic sequences according to a preset period.
The embodiment of the invention judges whether the local base station is interfered or not through the times of each characteristic sequence; therefore, for each preset period, the local base station counts the detected times of the recorded feature sequences, and determines the corresponding times of the recorded feature sequences in the period. The preset period may be determined according to the actual situation of the base station, for example, 1 hour.
And 103, comparing the times of each characteristic sequence with a first threshold, and determining the first target number of the characteristic sequences of which the times exceed the first threshold.
After the times of each characteristic sequence are determined, sequentially comparing the times of each characteristic sequence with a first threshold, and determining the number of the characteristic sequences of which the times exceed the first threshold; and determining the number of the characteristic sequences with the times exceeding a first threshold as a first target number. The first threshold is determined according to actual conditions, and the range can be set to any integer between 1 and 100, such as 5.
And step 104, when the first target number exceeds the number threshold, determining that the local base station is interfered by the remote base station, and adjusting the ratio of the special subframes to a first ratio.
The embodiment of the invention determines whether the local base station is interfered by the remote base station according to the first target number; after the first target number is determined, the first target number may be compared with a number threshold, where the number threshold is used to determine whether the local base station is interfered by the remote base station, and the number threshold may be set according to an actual situation, for example, 8. When the first target number exceeds the number threshold, determining that the local base station is interfered by the remote base station; and when the first target number is smaller than the number threshold, determining that the local base station is not interfered by the remote base station. Therefore, when the first target number exceeds the number threshold, the local base station can correspondingly adjust the ratio of the characteristic subframes according to a first ratio, wherein the first ratio is the ratio information of each time slot in the special subframes; namely, the proportion of each time slot in the special subframe is adjusted according to the first proportion. The first ratio is ratio information of each time slot of the special subframe, such as 3:9:2, which can reduce interference of the remote base station when the local base station is interfered by the remote base station.
In summary, when the local base station of the embodiment of the present invention receives a radio frame, the local base station performs characteristic sequence detection on the radio frame and records the radio frame; then respectively counting the times corresponding to the detected characteristic sequences according to a preset period; comparing the times of each characteristic sequence with a first threshold, and determining the number of first targets of the characteristic sequences of which the number exceeds the first threshold; the number threshold is used for judging whether the local base station is interfered by a remote base station; therefore, when the first target number exceeds the number threshold, the local base station is determined to be interfered by the remote base station, and the ratio of the special subframes is adjusted to be the first ratio. Therefore, when the local base station is determined to be interfered by the remote base station according to the detected number of the characteristic sequences, the ratio of the special subframes can be automatically adjusted; the adjusting efficiency of the special subframe ratio is greatly improved.
In another embodiment of the present invention, if the local base station is in a normal state in the present period, it can be determined whether the local base station is interfered, and when it is determined that the local base station is interfered, the local base station can enter an evaded state by adjusting the ratio of the special subframes. If the local base station is in the evasion state in the period, whether the local base station is interfered or not can be judged, and when the local base station is determined not to be interfered, the local base station can be in the normal state by adjusting the proportion of the special subframes.
Referring to fig. 2, a flowchart of steps of another embodiment of the interference avoidance method of the present invention is shown, which specifically includes:
In the embodiment of the invention, the physical layer in the baseband of the local base station can detect the characteristic sequence of the radio frame, then the detected characteristic sequence is sent to the operation control layer of the main control unit, the characteristic sequence is recorded by the operation control layer, and the judgment of whether the proportion of the special sub-frames needs to be adjusted is completed. The specific steps for detecting and recording the characteristic sequence are as follows:
and a substep S1 of detecting the characteristic sequence of the uplink pilot time slot and the uplink subframe in turn by adopting the reference sequence.
The radio frame in the embodiment of the invention comprises: an uplink subframe, a downlink subframe and a special subframe; each uplink subframe and each downlink subframe respectively comprise two time slots, and each time slot comprises 6 or 7 symbols; the special sub-frame comprises a downlink pilot frequency time slot, a protection time slot and an uplink pilot frequency time slot, and the number of symbols in different time slots is different. Under the condition that atmospheric waveguides exist, a downlink signal of a far-end base station carrying a characteristic sequence crosses a protection time slot and falls into an uplink pilot frequency time slot of a local base station, so that interference is caused to the local base station. Wherein, different frame numbers of the downlink signal can carry the characteristic sequence, such as the last two symbols of the downlink pilot time slot. Therefore, the physical layer of the local base station can perform signature sequence detection on the symbols in the uplink pilot time slot and the symbols in the uplink subframe by using a reference sequence such as a ZC sequence.
A substep S2 of, when the characteristic sequence is detected, judging whether the characteristic sequence has been recorded; if the feature sequence has been recorded, performing substep S3; if the signature sequence is not recorded, sub-step S4 is performed.
In the embodiment of the invention, the physical layer can upload all detected feature sequences to the operation control layer after one period, and the operation control layer sequentially judges whether each feature sequence is recorded locally or not after receiving the detected feature sequences; if the feature sequence has been recorded, performing substep S3; if the signature sequence is not recorded, sub-step S4 is performed. And the period of uploading the detected characteristic sequence by the physical layer is less than the preset period.
Substep S3, adding 1 to the number of feature sequences.
If the signature sequence is recorded locally, the number of signature sequences is increased locally by 1. In the embodiment of the invention, in order to facilitate the subsequent optimization of the interference base station and determine the accuracy of the interference base station, the power corresponding to the characteristic sequence can be recorded.
And a substep S4 of recording the characteristic sequences and setting the number of the characteristic sequences to 1.
If the characteristic sequence is not locally recorded, locally recording the characteristic sequence; and sets the number of the signature sequences to 1. Similarly, the power corresponding to the signature sequence may also be recorded.
The operation control layer may count the number of times corresponding to each feature sequence according to a preset period, where the preset period may be an upload period of multiple physical layers. The control layer may then operate to perform the following three steps simultaneously, as shown in steps 203-205, depending on the number of times each feature sequence is performed.
And 204, comparing the times of each characteristic sequence with a second threshold, and determining the number of second targets of the characteristic sequences of which the number is lower than the second threshold, wherein the first threshold is larger than the second threshold.
Comparing the times of each characteristic sequence with a first threshold, and determining the number of first targets of the characteristic sequences of which the times exceed the first threshold; and comparing the times of each characteristic sequence with a second threshold, and determining a second target number of the characteristic sequences with the number lower than the second threshold. The second threshold is smaller than the first threshold, the size of the second threshold is also set according to the time situation, and the second threshold can be set to be an integer in the range of 0-99; for example, the first threshold is 5 and the second threshold is 0. The locally recorded feature sequences are all nonrepeating feature sequences, and the total number of the nonrepeating feature sequences recorded locally is determined.
In the embodiment of the invention, if the local base station is in a normal state, whether interference avoidance is carried out can be judged; and when the local base station is in the evasion state, whether the local base station is adjusted to be in the normal state or not can be judged. The state of the local base station can be determined according to the special subframe ratio of the period. Therefore, whether the local base station is in a normal state at present can be judged according to the proportion of the special subframes in the preset period; when the proportion information of the special subframe proportion is a first proportion, determining that a local base station is in an avoidance state currently; and when the proportion information of the special subframe proportion is not the first proportion, determining that the local base station is in a normal state currently.
When the local base station is in a normal state, whether the first target number exceeds the number threshold value can be judged so as to judge whether the local base station is interfered by the remote base station. If yes, go to step 208; if not, go to step 211.
When the first target number exceeds a number threshold value, determining that the local base station is interfered by a remote base station, and adjusting the ratio of special subframes according to a first proportion; therefore, in the next preset period, the local base station sends the radio frame according to the ratio of the special subframe.
When the local base station is in the evasive state, whether the number of the second targets is equal to the total number can be judged so as to judge whether the local base station is not interfered by the far-end base station. If yes, go to step 210; if not, go to step 211.
When the second target number is equal to the total number, determining that the local base station is not interfered by a remote base station, and adjusting the proportion of special subframes according to a second proportion; therefore, in the next preset period, the local base station sends the radio frame according to the ratio of the special subframe. Wherein, the second ratio is ratio information of each time slot in the special subframe, such as 11: 2: 1.
and step 211, keeping the special subframe ratio unchanged.
When the first target number exceeds a number threshold value or the second target number is not equal to the total number, keeping the ratio of the special subframes unchanged; that is, the ratio of the special sub-frame in the next period is the same as that in the present period.
In the embodiment of the invention, the matching of the special subframes is as follows: number of symbols of downlink pilot time slot: number of symbols of guard slot: number of symbols of the uplink pilot slot.
In an application of the present invention, 10 feature sequences A, B, C, D, E, F, G, H, I, J are recorded in a preset period, where the number of each feature sequence is: 1. 5, 6, 7, 5, 1, 7, 6, 1; the first threshold is 4, the second threshold is 0, and the number threshold is 4; the first ratio is 3:9:2, the second proportion is: 10: 2: 2; if the first target number is 6 when the local base station is currently in a normal state, so that the interference on the local base station is determined, the ratio of the special subframes is adjusted to 3:9: 2.
in addition, the subsequent operation control layer sends each characteristic sequence and corresponding power to the physical layer, and the physical layer calculates the ratio of the power of each characteristic sequence to the background noise; and then sending the ratio of each characteristic sequence to an operation control layer, so that the operation control layer compares each ratio with a power threshold value, and calculates and determines the accuracy of the interference base station.
After determining the times corresponding to the characteristic sequences, determining a second target number of the characteristic sequences with the times lower than a second threshold and the total number of the recorded characteristic sequences; when the local base station is determined to be in the avoidance state, if the second target number is equal to the total number, the proportion of the special subframes is adjusted to a second proportion; the local base station can recover the evasion state of the local base station to a normal state according to the number of the second targets without manual operation; therefore, the local base station can automatically switch from the normal state to the evasive state and back from the evasive state to the normal state according to the number of the characteristic sequences, the switching efficiency of the base station to different states is improved, and the operation is simple and convenient.
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 present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Referring to fig. 3, a block diagram of a structure of an embodiment of an interference avoidance apparatus of the present invention is shown, which may specifically include the following modules: a sequence detection module 301, a number statistics module 302, a number determination module 303, and a first scale adjustment module 304, wherein,
a sequence detection module 301, configured to perform characteristic sequence detection on the received wireless frame and record the detected wireless frame;
the number counting module 302 is configured to count the number of times corresponding to each detected feature sequence according to a preset period;
a number determining module 303, configured to compare the number of times of each feature sequence with a first threshold, and determine a first target number of feature sequences whose number of times exceeds the first threshold;
a first ratio adjusting module 304, configured to, when the first target number exceeds the number threshold, determine that the local base station is interfered by the remote base station, and adjust the ratio of the special subframes to a first ratio; the number threshold is used for judging whether the local base station is interfered by a remote base station, and the first proportion is proportion information of each time slot in a special subframe.
Referring to fig. 4, there is shown a block diagram of another interference avoidance apparatus embodiment of the present invention; in a preferred embodiment of the present invention, the apparatus further comprises: a first scale holding module 305, a number determining module 306, a judging module 307, a second scale adjusting module 308, and a second scale holding module 309, wherein,
a first ratio keeping module 305, configured to keep the ratio of the special subframes unchanged when it is determined that the first target number is lower than the number threshold.
A quantity determining module 306, configured to compare the number of times of each feature sequence with a second threshold, and determine a second target quantity of feature sequences whose quantity is lower than the second threshold, where the first threshold is greater than the second threshold; and determining a total number of signature sequences of the record.
The judging module 307 judges whether the local base station is currently in a normal state according to the special subframe ratio of the preset period; if yes, judging whether the first target number exceeds a number threshold value; if not, judging whether the second target number is equal to the total number.
A second proportion adjusting module 308, configured to, when the second target number is equal to the total number, determine that the local base station is not interfered by the remote base station, adjust the ratio of the special subframes of the base station to a second proportion, where the second proportion is proportion information of each time slot in the special subframes;
a second ratio keeping module 309, configured to keep the special subframe ratio unchanged when the second target number is not equal to the total number.
In a preferred embodiment of the present invention, the special subframe includes: a downlink pilot time slot, a protection time slot and an uplink pilot time slot; the special subframe ratio is as follows: the symbol number of the downlink pilot time slot, the symbol number of the protection time slot and the proportion of the uplink pilot time slot.
When a local base station receives a wireless frame, detecting and recording a characteristic sequence of the wireless frame; then respectively counting the times corresponding to the detected characteristic sequences according to a preset period; comparing the times of each characteristic sequence with a first threshold, and determining the number of first targets of the characteristic sequences of which the number exceeds the first threshold; the number threshold is used for judging whether the local base station is interfered by a remote base station; therefore, when the first target number exceeds the number threshold, the local base station is determined to be interfered by the remote base station, and the ratio of the special subframes is adjusted to be the first ratio. Therefore, when the local base station is determined to be interfered by the remote base station according to the detected number of the characteristic sequences, the ratio of the special subframes can be automatically adjusted; the adjusting efficiency of the special subframe ratio is greatly improved.
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 skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention 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 invention 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 invention 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 invention. 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 invention 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 preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
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 interference avoidance method and the interference avoidance device provided by the invention are described in detail, specific examples are applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, 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 invention.
Claims (14)
1. An interference avoidance method, comprising:
the local base station detects and records the characteristic sequence of the received wireless frame;
respectively counting the times corresponding to the detected characteristic sequences according to a preset period;
comparing the times of each characteristic sequence with a first threshold, and determining the number of first targets of the characteristic sequences of which the times exceed the first threshold;
when the first target number exceeds the number threshold value, determining that the local base station is interfered by a remote base station, and adjusting the ratio of the special subframes to a first ratio;
the number threshold is used for judging whether the local base station is interfered by a remote base station, and the first proportion is proportion information of each time slot in a special subframe.
2. The method of claim 1, wherein the radio frame comprises an uplink subframe and a special subframe, and wherein the special subframe comprises an uplink pilot slot;
the local base station detects and records the characteristic sequence of the received wireless frame, and the method comprises the following steps:
adopting a reference sequence to sequentially detect the characteristic sequences of an uplink pilot frequency time slot and an uplink subframe;
when the characteristic sequence is detected, judging whether the characteristic sequence is recorded or not;
adding 1 to the number of feature sequences when the feature sequences have been recorded;
when the feature sequence is not recorded, the feature sequence is recorded, and the number of the feature sequences is set to 1.
3. The method of claim 1, further comprising:
and when the first target number is determined to be lower than the number threshold, keeping the ratio of the special subframes unchanged.
4. The method of claim 1, wherein after the step of detecting and recording the signature sequence of the received radio frame by the local base station, further comprising:
comparing the times of each characteristic sequence with a second threshold, and determining the number of second targets of the characteristic sequences with the number lower than the second threshold, wherein the first threshold is larger than the second threshold;
and determining a total number of signature sequences of the record.
5. The method of claim 4, further comprising, after the step of determining a first target number of signature sequences whose number exceeds a first threshold:
judging whether the local base station is in a normal state currently or not according to the special subframe ratio of the preset period;
if the local base station is in a normal state currently, judging whether the first target number exceeds a number threshold value;
and if the local base station is in the avoidance state currently, judging whether the number of the second targets is equal to the total number.
6. The method of claim 5, wherein when the local base station is currently in the avoidance state, the method further comprises:
when the second target number is equal to the total number, determining that the local base station is not interfered by a remote base station, and adjusting the proportion of special subframes of the base station to a second proportion, wherein the second proportion is proportion information of each time slot in the special subframes;
when the second target number is not equal to the total number, keeping the special subframe ratio unchanged.
7. The method according to any of claims 1-6, wherein the special subframe comprises: a downlink pilot time slot, a protection time slot and an uplink pilot time slot; the special subframe ratio is as follows: the symbol number of the downlink pilot time slot, the symbol number of the protection time slot and the proportion of the uplink pilot time slot.
8. An interference avoidance apparatus, applied to a base station, includes:
the sequence detection module is used for detecting and recording the characteristic sequence of the received wireless frame;
the number counting module is used for respectively counting the times corresponding to the detected characteristic sequences according to a preset period;
the number determining module is used for comparing the times of each characteristic sequence with a first threshold and determining the number of first targets of the characteristic sequences of which the times exceed the first threshold;
the first proportion adjusting module is used for adjusting the proportion of the special subframes to a first proportion when the first target number exceeds the number threshold and the local base station is determined to be interfered by the remote base station; the number threshold is used for judging whether the local base station is interfered by a remote base station, and the first proportion is proportion information of each time slot in a special subframe.
9. The apparatus of claim 8, wherein the radio frame comprises an uplink subframe and a special subframe, and wherein the special subframe comprises an uplink pilot slot;
the sequence detection module is specifically used for sequentially carrying out characteristic sequence detection on an uplink pilot frequency time slot and an uplink subframe by adopting a reference sequence; when the characteristic sequence is detected, judging whether the characteristic sequence is recorded or not; adding 1 to the number of feature sequences when the feature sequences have been recorded; when the characteristic sequence is not recorded, recording the characteristic sequence, and setting the number of the characteristic sequence to 1; the wireless frame comprises an uplink subframe and a special subframe, and the special subframe comprises an uplink pilot frequency time slot.
10. The apparatus of claim 8, further comprising:
and the first proportion keeping module is used for keeping the proportion of the special subframes unchanged when the first target number is determined to be lower than the number threshold.
11. The apparatus of claim 8, further comprising:
the quantity determining module is used for comparing the times of the characteristic sequences with a second threshold and determining the second target quantity of the characteristic sequences of which the quantity is lower than the second threshold, wherein the first threshold is larger than the second threshold; and determining a total number of signature sequences of the record.
12. The apparatus of claim 8, further comprising:
the judging module judges whether the local base station is in a normal state currently or not according to the special subframe ratio of the preset period; if the local base station is in a normal state currently, judging whether the first target number exceeds a number threshold value; and if the local base station is in the evasion state currently, judging whether the number of the second targets is equal to the total number.
13. The apparatus of claim 12, further comprising:
a second proportion adjusting module, configured to, if the local base station is currently in an avoidance state, determine that the local base station is not interfered by the remote base station when the second target number is equal to the total number, and adjust the proportion of the special subframes of the base station to a second proportion, where the second proportion is proportion information of each time slot in the special subframes;
and the second proportion keeping module is used for keeping the proportion of the special subframes unchanged when the second target number is not equal to the total number if the local base station is in the avoidance state currently.
14. The apparatus according to any of claims 8-13, wherein the special subframe comprises: a downlink pilot time slot, a protection time slot and an uplink pilot time slot; the special subframe ratio is as follows: the symbol number of the downlink pilot time slot, the symbol number of the protection time slot and the proportion of the uplink pilot time slot.
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| CN111417209A (en) * | 2019-01-07 | 2020-07-14 | 中国移动通信有限公司研究院 | Data scheduling method, device and base station |
| CN111836387B (en) * | 2019-04-17 | 2022-12-23 | 大唐移动通信设备有限公司 | Self-adaptive method and device for far-end interference |
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| US9516657B2 (en) * | 2011-04-01 | 2016-12-06 | Interdigital Patent Holdings, Inc. | Controlling inter-cell interference in forward access channel (Cell—FACH) state |
| CN103947242B (en) * | 2012-10-30 | 2018-01-16 | 华为技术有限公司 | Method for distinguishing, equipment and system are collected and known in one kind interference |
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