CN108696938B - Physical Random Access Channel (PRACH) configuration method, device and base station - Google Patents
Physical Random Access Channel (PRACH) configuration method, device and base station Download PDFInfo
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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
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The invention provides a method, a device and a base station for configuring a Physical Random Access Channel (PRACH), wherein the configuration method comprises the following steps: when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station; determining the initial position of a target frequency point according to the obtained information of the physical resource block; and modifying the frequency point offset position of the PRACH of the target base station according to the starting position of the target frequency point. The scheme can effectively reduce interference, and solves the problem that in the prior art, the local uplink reception is still seriously interfered by a remote base station due to the scheme of avoiding the remote interference caused by the atmospheric waveguide to the maximum extent.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for configuring a physical random access channel PRACH, and a base station.
Background
With the rapid development of the TD-LTE (Time Division Long Term Evolution) industry, the interference of the downlink of the far-end base station to the uplink of the near-end base station of the Time Division duplex TDD system caused by the atmospheric waveguide effect is also more severe. The atmospheric waveguide is a phenomenon that most of the radio wave radiation is limited to propagate in a troposphere because of the existence of a layer in which inverse temperature or water vapor is sharply reduced along with height, and radio wave forms super-refraction propagation in the layer. When the atmospheric waveguide occurs, a downlink signal of a far-end base station still has high strength after being transmitted over an ultra-long distance of tens or hundreds of kilometers, and a signal propagation delay exceeds the length of a Guard Period (GP) and falls into an uplink receiving window of a near-end base station, which causes severe uplink interference, as shown in fig. 1 (where D represents a downlink pilot time slot DwPTS, and U represents an uplink pilot time slot UpPTS). TD-LTE large-area uplink disturbance in many provinces such as Jiangsu, Anhui, Hainan and Henan can reach 25dB of uplink IOT (Interference over Thermal) rise, and KPI (key performance index) such as radio resource control RRC (radio resource control) connection establishment success rate is seriously deteriorated. The interfered cell mainly takes an F frequency band (1.9GHz), and the interference time is mainly concentrated at 0:00-10: 00; the interference is easy to occur in spring and autumn, and the affected base stations are hundreds to tens of thousands of different.
At present, a plurality of technologies and algorithms exist, and far-end interference brought by atmospheric waveguide can be effectively reduced. The commonly used method in the existing network is as follows: after the atmospheric waveguide interference is generated, the interference station modifies the special subframe ratio to increase GP, so that the interference to the interfered station can be effectively reduced. And if no atmospheric waveguide interference is detected within a period of time, returning to the original setting (the interference is avoided by modifying the scheme of special subframe ratio; based on channel reciprocity, a disturbed station sends a characteristic sequence in the downlink, and an disturbing station detects in the uplink; and if the characteristic sequence or the interference is detected to exceed a threshold, automatically returning the special subframe ratio to 3:9: 2). The equivalent guard interval is increased by 6 orthogonal frequency division multiplexing OFDM symbols, and the range of resisting atmospheric waveguide interference of the system after the whole network is modified is improved from 60km to 180 km.
However, in the existing network, there is still a situation that local uplink reception is interfered by a remote base station after modification, especially a PRACH channel (physical random access channel) belongs to an uplink critical process in the system, and if a strong interference is received, a terminal may not be able to access the network, so that a service fails.
Disclosure of Invention
The invention aims to provide a method, a device and a base station for configuring a Physical Random Access Channel (PRACH), which solve the problem that in the prior art, the problem that the local uplink reception is still seriously interfered by a remote base station still exists in the scheme of avoiding the remote interference caused by an atmospheric waveguide.
In order to solve the above technical problem, an embodiment of the present invention provides a method for configuring a physical random access channel PRACH, which is applied to a base station, and includes:
when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station;
determining the initial position of a target frequency point according to the obtained information of the physical resource block;
and modifying the frequency point offset position of the PRACH of the target base station according to the starting position of the target frequency point.
Optionally, the step of acquiring the preset number of consecutive physical resource blocks with the minimum interference in the bandwidth of the target base station when detecting that the target base station has signal interference includes:
detecting whether a target base station has signal interference;
when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station.
Optionally, the step of detecting whether the target base station has signal interference includes:
periodically carrying out interference detection on the downlink data of the target base station;
and when the interference is detected for a predetermined number of times, determining that the target base station has signal interference.
Optionally, the step of detecting whether the target base station has signal interference includes:
detecting whether signal interference exists in the same position of a target base station and an adjacent base station;
and if so, determining that the signal interference exists in the target base station.
Optionally, the step of acquiring the preset number of consecutive physical resource blocks with the minimum interference in the bandwidth of the target base station when detecting that the target base station has signal interference includes:
when detecting that a target base station has signal interference, acquiring an interference detection result of each group of preset number of continuous physical resource blocks in the bandwidth of the target base station;
obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result;
and obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve.
Optionally, the preset number is 6, and when it is detected that the target base station has signal interference, the step of obtaining the interference detection result of each group of the preset number of consecutive physical resource blocks in the bandwidth of the target base station adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Piis the power value on the ith physical resource block, i, etc
At n, n +1, n +2, n +3, n +4 or n + 5;
Γnis the total energy value of the n-th group of 6 consecutive physical resource blocks.
Optionally, the step of acquiring the preset number of consecutive physical resource blocks with the minimum interference in the bandwidth of the target base station when detecting that the target base station has signal interference includes:
acquiring interference detection results of a preset number of continuous physical resource blocks of a preset group number in the bandwidth of the target base station;
obtaining a target interference value according to the interference detection result;
sequentially carrying out interference detection on each group of continuous physical resource blocks with preset number in the bandwidth of the target base station according to the target interference value;
and when detecting that the interference result of a group of continuous physical resource blocks with preset number is smaller than the target interference value, stopping detection, and taking the group of continuous physical resource blocks with preset number as the continuous physical resource blocks with the preset number with minimum interference in the bandwidth of the target base station.
Optionally, when detecting that the target base station has signal interference, the configuration method further includes:
acquiring the position of a subframe where the intensity of interference reaches;
and when the position of the reached subframe exceeds the cyclic prefix part of the random access preamble, modifying the preamble format of the PRACH according to the position of the reached subframe.
Optionally, when detecting that the target base station has signal interference, the configuration method further includes:
determining a target time domain sending position of the PRACH according to the subframe ratio information and a principle of being far away from a protection time slot GP;
and taking the target time domain sending position as the current time domain sending position of the PRACH.
The invention also provides a configuration device of the physical random access channel PRACH, which is applied to a base station and comprises the following steps:
the first acquisition module is used for acquiring a preset number of continuous physical resource blocks with minimum interference in the bandwidth of a target base station when the target base station is detected to have signal interference;
the first determining module is used for determining the initial position of the target frequency point according to the obtained information of the physical resource block;
and the first processing module is used for modifying the frequency point offset position of the PRACH of the target base station according to the target frequency point starting position.
Optionally, the first obtaining module:
the first detection submodule is used for detecting whether signal interference exists in the target base station;
the first obtaining submodule is used for obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station when the target base station is detected to have signal interference.
Optionally, the first detection sub-module includes:
a first detection unit, configured to periodically perform interference detection on downlink data of the target base station;
the first determining unit is used for determining that the target base station is detected to have signal interference when the interference is detected for a predetermined number of times continuously.
Optionally, the first detection sub-module includes:
the second detection unit is used for detecting whether signal interference exists at the same position of the target base station and the adjacent base station;
and the second determining unit is used for determining that the signal interference exists in the target base station when the target base station and the adjacent base station detect the signal interference at the same position.
Optionally, the first obtaining module includes:
the second obtaining submodule is used for obtaining the interference detection result of each group of continuous physical resource blocks with preset number in the bandwidth of the target base station when the target base station is detected to have signal interference;
the first processing submodule is used for obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result;
and the second processing submodule is used for obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve.
Optionally, the preset number is 6, and the second obtaining sub-module adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Piis the power value on the ith physical resource block, i, etc
At n, n +1, n +2, n +3, n +4 or n + 5;
Γnis the total energy value of the n-th group of 6 consecutive physical resource blocks.
Optionally, the first obtaining module includes:
a third obtaining submodule, configured to obtain interference detection results of a preset number of consecutive physical resource blocks in a preset group number in a bandwidth of the target base station;
the third processing submodule is used for obtaining a target interference value according to the interference detection result;
the second detection submodule is used for sequentially carrying out interference detection on each group of continuous physical resource blocks with preset quantity in the bandwidth of the target base station according to the target interference value;
and the fourth processing submodule is used for stopping detection when the interference result of a group of preset number of continuous physical resource blocks is smaller than the target interference value, and taking the group of preset number of continuous physical resource blocks as the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station.
Optionally, the configuration device further includes:
the second acquisition module is used for acquiring the position of a subframe where the intensity of interference reaches when the target base station is detected to have signal interference;
and the second processing module is used for modifying the preamble format of the PRACH according to the reached subframe position when the reached subframe position exceeds the cyclic prefix part of the random access preamble.
Optionally, the configuration device further includes:
the second determining module is used for determining a target time domain sending position of the PRACH according to the subframe ratio information and the principle of being far away from the protection time slot GP when the target base station is detected to have signal interference;
and the third processing module is used for taking the target time domain sending position as the current time domain sending position of the PRACH.
The present invention also provides a base station, comprising:
the processor is used for acquiring a preset number of continuous physical resource blocks with minimum interference in the bandwidth of a target base station when the target base station is detected to have signal interference;
determining the initial position of a target frequency point according to the obtained information of the physical resource block;
and modifying the frequency point offset position of the PRACH of the target base station according to the starting position of the target frequency point.
Optionally, the processor is specifically configured to:
detecting whether a target base station has signal interference;
when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station.
Optionally, the processor is further configured to:
periodically carrying out interference detection on the downlink data of the target base station;
and when the interference is detected for a predetermined number of times, determining that the target base station has signal interference.
Optionally, the processor is further configured to:
detecting whether signal interference exists in the same position of a target base station and an adjacent base station;
and if so, determining that the signal interference exists in the target base station.
Optionally, the processor is specifically configured to:
when detecting that a target base station has signal interference, acquiring an interference detection result of each group of preset number of continuous physical resource blocks in the bandwidth of the target base station;
obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result;
and obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve.
Optionally, the preset number is 6, and the processor adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Piis the power value on the ith physical resource block, i, etc
At n, n +1, n +2, n +3, n +4 or n + 5;
Γnis the total energy value of the n-th group of 6 consecutive physical resource blocks.
Optionally, the processor is specifically configured to:
acquiring interference detection results of a preset number of continuous physical resource blocks of a preset group number in the bandwidth of the target base station;
obtaining a target interference value according to the interference detection result;
sequentially carrying out interference detection on each group of continuous physical resource blocks with preset number in the bandwidth of the target base station according to the target interference value;
and when detecting that the interference result of a group of continuous physical resource blocks with preset number is smaller than the target interference value, stopping detection, and taking the group of continuous physical resource blocks with preset number as the continuous physical resource blocks with the preset number with minimum interference in the bandwidth of the target base station.
Optionally, when it is detected that the target base station has signal interference, the processor is further configured to:
acquiring the position of a subframe where the intensity of interference reaches;
and when the position of the reached subframe exceeds the cyclic prefix part of the random access preamble, modifying the preamble format of the PRACH according to the position of the reached subframe.
Optionally, when it is detected that the target base station has signal interference, the processor is further configured to:
determining a target time domain sending position of the PRACH according to the subframe ratio information and a principle of being far away from a protection time slot GP;
and taking the target time domain sending position as the current time domain sending position of the PRACH.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the configuration method of the physical random access channel PRACH obtains the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station by detecting that the target base station has signal interference; determining the initial position of a target frequency point according to the obtained information of the physical resource block; the frequency point offset position of the PRACH of the target base station is modified according to the starting position of the target frequency point, so that the interference can be effectively reduced, and the problem that the local uplink receiving is still seriously interfered by the remote base station due to the scheme of avoiding the remote interference caused by the atmospheric waveguide in the prior art is solved to the greatest extent.
Drawings
FIG. 1 is a schematic diagram illustrating a base station interfered by an atmospheric waveguide in the prior art;
fig. 2 is a schematic flow chart of a method for configuring a physical random access channel PRACH in a first embodiment of the present invention;
fig. 3 is a schematic diagram of a specific application flow of a method for configuring a physical random access channel PRACH in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a configuration apparatus for a physical random access channel PRACH in a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to a third embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides various solutions for solving the problem that the local uplink reception is still seriously interfered by a far-end base station in the prior art of avoiding far-end interference caused by atmospheric waveguides, and the solutions are as follows:
example one
As shown in fig. 2, a method for configuring a physical random access channel PRACH, according to an embodiment of the present invention, is applicable to a base station, and includes:
step 21: when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station;
step 22: determining the initial position of a target frequency point according to the obtained information of the physical resource block;
step 23: and modifying the frequency point offset position of the PRACH of the target base station according to the starting position of the target frequency point.
Wherein the signal interference may be atmospheric waveguide interference. The preset number is preferably 6. The base station and the target base station may be the same base station or different base stations, and are not limited herein.
According to the configuration method of the physical random access channel PRACH provided by the embodiment of the invention, when the target base station is detected to have signal interference, the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station are obtained; determining the initial position of a target frequency point according to the obtained information of the physical resource block; the frequency point offset position of the PRACH of the target base station is modified according to the starting position of the target frequency point, so that the interference can be effectively reduced, and the problem that the local uplink receiving is still seriously interfered by the remote base station due to the scheme of avoiding the remote interference caused by the atmospheric waveguide in the prior art is solved to the greatest extent.
Specifically, the step of acquiring the preset number of consecutive physical resource blocks with minimum interference in the bandwidth of the target base station when detecting that the target base station has signal interference includes: detecting whether a target base station has signal interference; when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station.
In order to have a certain real-time performance, in this embodiment, the step of detecting whether the target base station has signal interference includes: periodically carrying out interference detection on the downlink data of the target base station; and when the interference is detected for a predetermined number of times, determining that the target base station has signal interference.
The predetermined number of times may be 2 times.
In order to further reduce the false detection rate, in this embodiment, the step of detecting whether the target base station has signal interference includes: detecting whether signal interference exists in the same position of a target base station and an adjacent base station; and if so, determining that the signal interference exists in the target base station. If not, the target base station is detected again.
Specifically, the step of acquiring the preset number of consecutive physical resource blocks with minimum interference in the bandwidth of the target base station when detecting that the target base station has signal interference includes: when detecting that a target base station has signal interference, acquiring an interference detection result of each group of preset number of continuous physical resource blocks in the bandwidth of the target base station; obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result; and obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve.
Preferably, the preset number is 6, and when it is detected that the target base station has signal interference, the step of obtaining the interference detection result of each group of the preset number of consecutive physical resource blocks in the bandwidth of the target base station adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Piis the power value on the ith physical resource block, i, etc
At n, n +1, n +2, n +3, n +4 or n + 5;
Γnis the total energy value of the n-th group of 6 consecutive physical resource blocks.
In order to reduce the amount of calculation, in this embodiment, when it is detected that the target base station has signal interference, the step of acquiring the preset number of consecutive physical resource blocks with minimum interference in the bandwidth of the target base station may include: acquiring interference detection results of a preset number of continuous physical resource blocks of a preset group number in the bandwidth of the target base station; obtaining a target interference value according to the interference detection result; sequentially carrying out interference detection on each group of continuous physical resource blocks with preset number in the bandwidth of the target base station according to the target interference value; and when detecting that the interference result of a group of continuous physical resource blocks with preset number is smaller than the target interference value, stopping detection, and taking the group of continuous physical resource blocks with preset number as the continuous physical resource blocks with the preset number with minimum interference in the bandwidth of the target base station.
It can be understood that: the method comprises the steps of calculating for multiple times, summing and averaging a plurality of minimum interference values to form a target interference value, calculating in sequence, and stopping detection when the interference value is smaller than the target interference value, namely considering that the position interference is small enough, namely the position interference can be used as a target position.
Further, in order to reduce interference, in this embodiment, when it is detected that the target base station has signal interference, the configuration method further includes: acquiring the position of a subframe where the intensity of interference reaches; and when the position of the reached subframe exceeds the cyclic prefix part of the random access preamble, modifying the preamble format of the PRACH according to the position of the reached subframe.
Further, when the target base station is detected to have signal interference, the configuration method further includes: determining a target time domain sending position of the PRACH according to the subframe ratio information and a principle of being far away from a protection time slot GP; and taking the target time domain sending position as the current time domain sending position of the PRACH.
In the following, the configuration method for the PRACH is further described, where the signal interference is, for example, atmospheric waveguide interference, the preset number is, for example, 6, and the interference is, for example, uplink interference.
Aiming at the technical problems that the interference intensity brought by the atmospheric waveguide changes according to the frequency and the above technical problems, the embodiment of the invention provides a configuration method of a Physical Random Access Channel (PRACH) (a method for reducing the interference of the atmospheric waveguide through PRACH self-adaptation), and according to the interference intensity and the range, the random access preamble code and the frequency offset position of the random access preamble code of the random access are modified to effectively reduce the interference (reduce the far-end interference caused by the atmospheric waveguide). Further, the closer to GP the atmospheric waveguide, the more serious the interference, the content of modifying the random access position is provided in this embodiment, and this scheme may also be used for interference caused by other factors, which is not limited herein.
As shown in fig. 3, a scheme (PRACH adaptation) provided in an embodiment of the present invention includes:
step 31: detecting whether remote interference exists in uplink, if so, entering a step 32, and if not, entering a step 37;
step 32: scanning and detecting information such as interference intensity and position;
step 33: modifying the PRACH frequency point offset;
step 34: modifying a preamble code format;
step 35: modifying a PRACH time domain transmission position;
step 36: updating the system message;
step 37: and (6) ending.
The specific implementation scheme is as follows:
it is stated here that the present solution requires upstream capability to detect far end disturbances caused by atmospheric waveguides.
Part one: firstly, detecting whether the target base station has atmospheric waveguide interference or not, specifically as follows:
1) setting the interference detection period as T1;
2) performing interference detection on downlink data every T1 time, and if interference is detected for n times (for example, 2 times) continuously, determining that the base station has interference; n is a positive integer greater than 1;
3) in order to further reduce the false detection rate, the detection results of the adjacent base stations can be summarized and analyzed, if the adjacent base stations also detect interference at the same position, namely the target base station is considered to have atmospheric waveguide interference, otherwise, the adjacent base stations do not detect the interference, and the target base station is detected again.
And part two: after detecting the far-end interference, the physical resource block PRB range where the interference wave reaches needs to be locked, the available 6 continuous PRB initial positions with the minimum interference are calculated, and then the frequency point offset position of a preamble code (PRACH) is modified. According to the atmospheric waveguide interference characteristic and the result of multiple detections, smoothing out an atmospheric waveguide interference function phi (n), if the interfering station and the interfered station are in the same frequency, the interference exists in all frequency bands, and the interference of 6 PRBs in the middle is relatively maximum; the PRB interference of the overlapped band is relatively maximum if the offender and victim stations are inter-frequency. According to the interference characteristics, the position of the PRB with less interference can be estimated, specifically as follows:
(1) taking 20MHz bandwidth as an example, there are 100 PRBs, which are numbered A in sequence1A2…A100；
(2) Dividing the 6 consecutive PRBs into a group of 95 groups, each group being denoted by Z, wherein the nth group Zn＝{An,An+1,An+2,An+3,An+4,An+5,1≤n≤95}；
(3) The interference value of Z is expressed by a function, and Z is setnThe interference value of (c) is Φ (n), which is given by equation one:
Φ(n)＝Γn-Ψn×Ωn(formula one)
Therein, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]，
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Piis the power value on the ith PRB, i equals n, n +1, n +2, n +3, n +4, or n + 5;
Γnis ZnTotal energy value of (c).
(4) The target starting position with the minimum interference can be estimated according to a curve of phi (n), and if a peak appears in the middle, namely co-channel interference, the target starting position S is 1 or 95; if the signal is of an inclined ascending type, namely pilot frequency interference, S is 1; if the position is of a downhill slope type, i.e. the pilot frequency interference, S is 95, the precise calculation of the optimal position is as follows (5).
(5) Starting from the first group, the detection is performed assuming that the interference value of the first group is phi1Setting S to 1 and making minimum interference value phimin＝Φ1Calculating a second set of interference values as phi2If phi2<ΦminThen update phimin＝Φ2And S is 2, until the interference value of the last group is calculated, and the comparison is carried out to obtain the final S, namely the starting position of the continuous 6 PRBs with the minimum interference is found.
(6) To reduce the amount of computation, one can doStep optimization, M phi can be calculated for multiple timesminSumming and averaging to a target interference value
Then sequentially calculating the current time when meeting
When the detection is stopped, the position interference is considered to be small enough, and the position interference can be used as a target position. M is a positive integer greater than 1 and less than or equal to 95.
(7) The PRACH-FreqOffset is modified according to the target location.
(8) In order to further improve the anti-interference effect, the third part is started to adjust the time domain;
and part three: when the far-end interference is detected, the position of a subframe where the intensity of the interference reaches needs to be judged, and a plurality of interferences are positioned in a Cyclic Prefix (CP) part of a random access preamble code, so that the processing is not needed; otherwise, if the CP portion is exceeded, the preamble code format is modified accordingly, and modified to format2 or even format3 (the subframe includes prefix-useless information and subsequent useful information, and is selected as format2 when the interference position occupies between 0 and a first threshold of the position of the useful information, and is selected as format3 when the first threshold is reached or even exceeded) to increase the tolerance to interference.
And part four: according to the characteristics of atmospheric waveguide interference, the closer to GP, the more serious the interference, so the time domain transmission position of the PRACH can be modified (a new position is determined according to subframe ratio information and a principle of being far away from GP), that is, the PRACH is transmitted on a subframe relatively far away from GP, for example, when the subframe ratio is 1, the PRACH can be transmitted on a subframe 3 or 8, and the interference of the downlink of a far-end base station to the uplink of a near-end base station is further reduced.
Part five: the updated System message modifies the physical random access channel PRACH-ConfigIndex (configuration index) and PRACH-FreqOffset (frequency offset), and then the terminal UE re-reads the System message (System Information, SI) and modifies the corresponding configuration, so as to reduce the far-end interference caused by the air waveguide.
Specifically, after the base station modifies the system message, the base station broadcasts the system message, and the corresponding terminal reads and updates the configuration (the existing scheme can be adopted, and details are not described here)
The scheme provided by the embodiment mainly modifies the frequency point offset according to the detected interference spread; modifying a preamble code format according to the detected interference intensity; modifying the sending position of the PRACH time domain according to the detected interference condition;
aiming at modifying the proportion of the special subframe and adapting PRACH, the frequent modification and configuration of the system can be avoided, and simultaneously, the problem that the local uplink receiving is still seriously interfered by a remote base station in the scheme of avoiding the remote interference caused by the atmospheric waveguide in the prior art is well solved.
Example two
As shown in fig. 4, a second embodiment of the present invention provides a configuration apparatus for a physical random access channel PRACH, which is applicable to a base station, and the configuration apparatus includes:
a first obtaining module 41, configured to obtain, when it is detected that a target base station has signal interference, a preset number of consecutive physical resource blocks with minimum interference in a bandwidth of the target base station;
a first determining module 42, configured to determine an initial position of a target frequency point according to the obtained information of the physical resource block;
a first processing module 43, configured to modify a frequency offset position of a physical random access channel PRACH of the target base station according to the target frequency point starting position.
The configuration device of the physical random access channel PRACH, provided by the second embodiment of the present invention, obtains a preset number of consecutive physical resource blocks with minimum interference in a bandwidth of a target base station by detecting that the target base station has signal interference; determining the initial position of a target frequency point according to the obtained information of the physical resource block; the frequency point offset position of the PRACH of the target base station is modified according to the starting position of the target frequency point, so that the interference can be effectively reduced, and the problem that the local uplink receiving is still seriously interfered by the remote base station due to the scheme of avoiding the remote interference caused by the atmospheric waveguide in the prior art is solved to the greatest extent.
Specifically, the first obtaining module: the first detection submodule is used for detecting whether signal interference exists in the target base station; the first obtaining submodule is used for obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station when the target base station is detected to have signal interference.
In order to have a certain real-time performance, in this embodiment, the first detection sub-module includes: a first detection unit, configured to periodically perform interference detection on downlink data of the target base station; the first determining unit is used for determining that the target base station is detected to have signal interference when the interference is detected for a predetermined number of times continuously.
In order to further reduce the false detection rate, in this embodiment, the first detection sub-module includes: the second detection unit is used for detecting whether signal interference exists at the same position of the target base station and the adjacent base station; and the second determining unit is used for determining that the target base station has signal interference if the signal interference is detected (when the target base station and the adjacent base station both detect the signal interference at the same position).
Specifically, the first obtaining module includes: the second obtaining submodule is used for obtaining the interference detection result of each group of continuous physical resource blocks with preset number in the bandwidth of the target base station when the target base station is detected to have signal interference; the first processing submodule is used for obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result; and the second processing submodule is used for obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve.
Preferably, the preset number is 6, and the second obtaining sub-module adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Piis the power value on the ith physical resource block, i, etc
At n, n +1, n +2, n +3, n +4 or n + 5;
Γnis the total energy value of the n-th group of 6 consecutive physical resource blocks.
In order to reduce the amount of calculation, in this embodiment, the first obtaining module includes: a third obtaining submodule, configured to obtain interference detection results of a preset number of consecutive physical resource blocks in a preset group number in a bandwidth of the target base station; the third processing submodule is used for obtaining a target interference value according to the interference detection result; the second detection submodule is used for sequentially carrying out interference detection on each group of continuous physical resource blocks with preset quantity in the bandwidth of the target base station according to the target interference value; and the fourth processing submodule is used for stopping detection when the interference result of a group of preset number of continuous physical resource blocks is smaller than the target interference value, and taking the group of preset number of continuous physical resource blocks as the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station.
Further, in order to reduce interference, in this embodiment, the configuration apparatus further includes: the second acquisition module is used for acquiring the position of a subframe where the intensity of interference reaches when the target base station is detected to have signal interference; and the second processing module is used for modifying the preamble format of the PRACH according to the reached subframe position when the reached subframe position exceeds the cyclic prefix part of the random access preamble.
Further, the configuration device further comprises: the second determining module is used for determining a target time domain sending position of the PRACH according to the subframe ratio information and the principle of being far away from the protection time slot GP when the target base station is detected to have signal interference; and the third processing module is used for taking the target time domain sending position as the current time domain sending position of the PRACH.
The implementation embodiments of the method for configuring a physical random access channel PRACH are all applicable to embodiments of the apparatus for configuring a physical random access channel PRACH, and can achieve the same technical effects.
EXAMPLE III
As shown in fig. 5, a base station according to a third embodiment of the present invention includes:
the processor 51 is configured to, when it is detected that a target base station has signal interference, acquire a preset number of consecutive physical resource blocks with minimum interference in a bandwidth of the target base station;
determining the initial position of a target frequency point according to the obtained information of the physical resource block;
and modifying the frequency point offset position of the PRACH of the target base station according to the starting position of the target frequency point.
The base station provided by the third embodiment of the invention obtains the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station by detecting that the target base station has signal interference; determining the initial position of a target frequency point according to the obtained information of the physical resource block; the frequency point offset position of the PRACH of the target base station is modified according to the starting position of the target frequency point, so that the interference can be effectively reduced, and the problem that the local uplink receiving is still seriously interfered by the remote base station due to the scheme of avoiding the remote interference caused by the atmospheric waveguide in the prior art is solved to the greatest extent.
Specifically, the processor is specifically configured to: detecting whether a target base station has signal interference; when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station.
In order to have a certain real-time performance, in this embodiment, the processor is further configured to: periodically carrying out interference detection on the downlink data of the target base station; and when the interference is detected for a predetermined number of times, determining that the target base station has signal interference.
In order to further reduce the false detection rate, in this embodiment, the processor is further configured to: detecting whether signal interference exists in the same position of a target base station and an adjacent base station; and if so, determining that the signal interference exists in the target base station.
Specifically, the processor is specifically configured to: when detecting that a target base station has signal interference, acquiring an interference detection result of each group of preset number of continuous physical resource blocks in the bandwidth of the target base station; obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result; and obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve.
Preferably, the preset number is 6, and the processor adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Piis the power value on the ith physical resource block, i, etc
At n, n +1, n +2, n +3, n +4 or n + 5;
Γnis the total energy value of the n-th group of 6 consecutive physical resource blocks.
In order to reduce the amount of computation, in this embodiment, the processor is specifically configured to: acquiring interference detection results of a preset number of continuous physical resource blocks of a preset group number in the bandwidth of the target base station; obtaining a target interference value according to the interference detection result; sequentially carrying out interference detection on each group of continuous physical resource blocks with preset number in the bandwidth of the target base station according to the target interference value; and when detecting that the interference result of a group of continuous physical resource blocks with preset number is smaller than the target interference value, stopping detection, and taking the group of continuous physical resource blocks with preset number as the continuous physical resource blocks with the preset number with minimum interference in the bandwidth of the target base station.
Further, in order to reduce interference, in this embodiment, when it is detected that the target base station has signal interference, the processor is further configured to: acquiring the position of a subframe where the intensity of interference reaches; and when the position of the reached subframe exceeds the cyclic prefix part of the random access preamble, modifying the preamble format of the PRACH according to the position of the reached subframe.
Further, upon detecting the presence of signal interference at the target base station, the processor is further configured to: determining a target time domain sending position of the PRACH according to the subframe ratio information and a principle of being far away from a protection time slot GP; and taking the target time domain sending position as the current time domain sending position of the PRACH.
The implementation embodiments of the configuration apparatus for physical random access channel PRACH are all applicable to the embodiment of the base station, and can achieve the same technical effect.
It should be noted that many of the functional components described in this specification are referred to as modules/sub-modules/units in order to more particularly emphasize their implementation independence.
In embodiments of the present invention, the modules/sub-modules/units may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.
Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.
When a module can be implemented by software, considering the level of existing hardware technology, a module implemented by software may build a corresponding hardware circuit to implement a corresponding function, without considering cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (18)
1. A method for configuring Physical Random Access Channel (PRACH) is applied to a base station and is characterized by comprising the following steps:
when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station;
determining the initial position of a target frequency point according to the obtained information of the physical resource block;
modifying the frequency point offset position of the physical random access channel PRACH of the target base station according to the target frequency point starting position;
when detecting that the target base station has signal interference, the step of acquiring the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station includes:
when detecting that a target base station has signal interference, acquiring an interference detection result of each group of preset number of continuous physical resource blocks in the bandwidth of the target base station;
obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result;
obtaining a preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve;
specifically, the preset number is 6, and when it is detected that the target base station has signal interference, the step of obtaining the interference detection result of each group of the preset number of consecutive physical resource blocks in the bandwidth of the target base station adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Pii is the power value on the ith physical resource block, i is equal to n, n +1, n +2, n +3,n +4 or n + 5;
Γna total energy value of 6 consecutive physical resource blocks of the nth group;
or, when it is detected that the target base station has signal interference, the step of acquiring the preset number of consecutive physical resource blocks with minimum interference in the bandwidth of the target base station includes:
acquiring interference detection results of a preset number of continuous physical resource blocks of a preset group number in the bandwidth of the target base station;
obtaining a target interference value according to the interference detection result;
sequentially carrying out interference detection on each group of continuous physical resource blocks with preset number in the bandwidth of the target base station according to the target interference value;
and when detecting that the interference result of a group of continuous physical resource blocks with preset number is smaller than the target interference value, stopping detection, and taking the group of continuous physical resource blocks with preset number as the continuous physical resource blocks with the preset number with minimum interference in the bandwidth of the target base station.
2. The configuration method according to claim 1, wherein the step of acquiring, when it is detected that the target base station has signal interference, the preset number of consecutive physical resource blocks with the smallest interference in the bandwidth of the target base station includes:
detecting whether a target base station has signal interference;
when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station.
3. The method according to claim 2, wherein the step of detecting whether the target base station has signal interference comprises:
periodically carrying out interference detection on the downlink data of the target base station;
and when the interference is detected for a predetermined number of times, determining that the target base station has signal interference.
4. The method according to claim 2, wherein the step of detecting whether the target base station has signal interference comprises:
detecting whether signal interference exists in the same position of a target base station and an adjacent base station;
and if so, determining that the signal interference exists in the target base station.
5. The method according to claim 1, wherein when the target base station is detected to have signal interference, the method further comprises:
acquiring the position of a subframe where the intensity of interference reaches;
and when the position of the reached subframe exceeds the cyclic prefix part of the random access preamble, modifying the preamble format of the PRACH according to the position of the reached subframe.
6. The method according to claim 1 or 5, wherein when detecting that the target base station has signal interference, the method further comprises:
determining a target time domain sending position of the PRACH according to the subframe ratio information and a principle of being far away from a protection time slot GP;
and taking the target time domain sending position as the current time domain sending position of the PRACH.
7. A configuration device of Physical Random Access Channel (PRACH) is applied to a base station and is characterized by comprising the following steps:
the first acquisition module is used for acquiring a preset number of continuous physical resource blocks with minimum interference in the bandwidth of a target base station when the target base station is detected to have signal interference;
the first determining module is used for determining the initial position of the target frequency point according to the obtained information of the physical resource block;
the first processing module is used for modifying the frequency point offset position of the PRACH of the target base station according to the target frequency point starting position;
wherein the first obtaining module comprises:
the second obtaining submodule is used for obtaining the interference detection result of each group of continuous physical resource blocks with preset number in the bandwidth of the target base station when the target base station is detected to have signal interference;
the first processing submodule is used for obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result;
the second processing submodule is used for obtaining a preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve;
specifically, the preset number is 6, and the second obtaining sub-module adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Pii is a power value on the ith physical resource block, and is equal to n, n +1, n +2, n +3, n +4 or n + 5;
Γna total energy value of 6 consecutive physical resource blocks of the nth group;
or, the first obtaining module includes:
a third obtaining submodule, configured to obtain interference detection results of a preset number of consecutive physical resource blocks in a preset group number in a bandwidth of the target base station;
the third processing submodule is used for obtaining a target interference value according to the interference detection result;
the second detection submodule is used for sequentially carrying out interference detection on each group of continuous physical resource blocks with preset quantity in the bandwidth of the target base station according to the target interference value;
and the fourth processing submodule is used for stopping detection when the interference result of a group of preset number of continuous physical resource blocks is smaller than the target interference value, and taking the group of preset number of continuous physical resource blocks as the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station.
8. The apparatus according to claim 7, wherein the first obtaining module comprises:
the first detection submodule is used for detecting whether signal interference exists in the target base station;
the first obtaining submodule is used for obtaining the preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station when the target base station is detected to have signal interference.
9. The configuration apparatus according to claim 8, wherein the first detection submodule includes:
a first detection unit, configured to periodically perform interference detection on downlink data of the target base station;
the first determining unit is used for determining that the target base station is detected to have signal interference when the interference is detected for a predetermined number of times continuously.
10. The configuration apparatus according to claim 8, wherein the first detection submodule includes:
the second detection unit is used for detecting whether signal interference exists at the same position of the target base station and the adjacent base station;
and the second determining unit is used for determining that the signal interference exists in the target base station when the target base station and the adjacent base station detect the signal interference at the same position.
11. The configuration device according to claim 7, wherein the configuration device further comprises:
the second acquisition module is used for acquiring the position of a subframe where the intensity of interference reaches when the target base station is detected to have signal interference;
and the second processing module is used for modifying the preamble format of the PRACH according to the reached subframe position when the reached subframe position exceeds the cyclic prefix part of the random access preamble.
12. A configuration arrangement according to claim 7 or 11, characterized in that the configuration arrangement further comprises:
the second determining module is used for determining a target time domain sending position of the PRACH according to the subframe ratio information and the principle of being far away from the protection time slot GP when the target base station is detected to have signal interference;
and the third processing module is used for taking the target time domain sending position as the current time domain sending position of the PRACH.
13. A base station, comprising:
the processor is used for acquiring a preset number of continuous physical resource blocks with minimum interference in the bandwidth of a target base station when the target base station is detected to have signal interference;
determining the initial position of a target frequency point according to the obtained information of the physical resource block;
modifying the frequency point offset position of the physical random access channel PRACH of the target base station according to the target frequency point starting position;
wherein the processor is specifically configured to:
when detecting that a target base station has signal interference, acquiring an interference detection result of each group of preset number of continuous physical resource blocks in the bandwidth of the target base station;
obtaining a signal interference function curve according to the signal interference characteristic and the interference detection result;
obtaining a preset number of continuous physical resource blocks with minimum interference in the bandwidth of the target base station according to the signal interference function curve;
specifically, the preset number is 6, and the processor adopts the following formula:
Φ(n)＝Γn-Ψn×Ωn；
wherein n is a group of 6 consecutive physical resource blocks PRB in each group in the bandwidth of the target base station, ΨnIs the rolling factor, Ψn＝[αn αn+1 αn+2 αn+3 αn+4 αn+5]；
Ωn＝[Pn Pn+1 Pn+2 Pn+3 Pn+4 Pn+5]′，Pii is a power value on the ith physical resource block, and is equal to n, n +1, n +2, n +3, n +4 or n + 5;
Γna total energy value of 6 consecutive physical resource blocks of the nth group;
or, the processor is specifically configured to:
acquiring interference detection results of a preset number of continuous physical resource blocks of a preset group number in the bandwidth of the target base station;
obtaining a target interference value according to the interference detection result;
sequentially carrying out interference detection on each group of continuous physical resource blocks with preset number in the bandwidth of the target base station according to the target interference value;
and when detecting that the interference result of a group of continuous physical resource blocks with preset number is smaller than the target interference value, stopping detection, and taking the group of continuous physical resource blocks with preset number as the continuous physical resource blocks with the preset number with minimum interference in the bandwidth of the target base station.
14. The base station of claim 13, wherein the processor is specifically configured to:
detecting whether a target base station has signal interference;
when signal interference exists in a target base station, acquiring a preset number of continuous physical resource blocks with minimum interference in a bandwidth of the target base station.
15. The base station of claim 13, wherein the processor is further configured to:
periodically carrying out interference detection on the downlink data of the target base station;
and when the interference is detected for a predetermined number of times, determining that the target base station has signal interference.
16. The base station of claim 13, wherein the processor is further configured to:
detecting whether signal interference exists in the same position of a target base station and an adjacent base station;
and if so, determining that the signal interference exists in the target base station.
17. The base station of claim 13, wherein upon detecting the presence of signal interference at the target base station, the processor is further configured to:
acquiring the position of a subframe where the intensity of interference reaches;
and when the position of the reached subframe exceeds the cyclic prefix part of the random access preamble, modifying the preamble format of the PRACH according to the position of the reached subframe.
18. The base station of claim 13 or 17, wherein upon detecting the presence of signal interference at the target base station, the processor is further configured to:
determining a target time domain sending position of the PRACH according to the subframe ratio information and a principle of being far away from a protection time slot GP;
and taking the target time domain sending position as the current time domain sending position of the PRACH.
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| CN111371517B (en) * | 2018-12-26 | 2021-06-25 | 大唐移动通信设备有限公司 | Method and device for evaluating reciprocity of far-end interference |
| CN111436132B (en) * | 2019-01-11 | 2024-04-30 | 成都华为技术有限公司 | Random access resource allocation method and device |
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| CN112788777B (en) * | 2019-11-07 | 2023-04-28 | 华为技术有限公司 | Random access preamble configuration method and device suitable for satellite network |
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