CN101808329B - Method and base station for adjusting density of PRACH (Physical Random Access Channels) - Google Patents
Method and base station for adjusting density of PRACH (Physical Random Access Channels) Download PDFInfo
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Abstract
The invention provides a method for adjusting the density of PRACH (Physical Random Access Channels), comprising the following steps: detecting the total number of the PRACH and the number of non-collision PRACH within a statistic period T, wherein the total number of the PRACH comprises the number of the non-collision PRACH and the number of collision PRACH; calculating the collision probability of the PRACH within the statistic period T according to the total number of the PRACH and the number of the non-collision PRACH by the base station; and adjusting the density N of the PRACH according to the collision probability r, a preset first probability threshold r1 and a second probability threshold r2 within the static period T. In the invention, the configuration of the density of the PRACH is automatically adjusted according to the collision probability of the PRACH by the base station without manual participation, and the base station of the invention can adjust the density of the PRACH in real time according to the environmental variation, thereby providing better service quality and greater thuoughput.
Description
Technical field
The present invention relates to communication technical field, particularly method and the base station of a kind of adjustment PRACH (Physical Random Access Channel, Physical Random Access Channel) channel density.
Background technology
In LTE (Long-Term Evolution, Long Term Evolution) system, UE (User Equipment, subscriber equipment) uses the PRACH channel to initiate at random access, sets up up link.The PRACH channel need to take certain uplink time/frequency source.If the PRACH number is reserved too much, then can too seize the running time-frequency resource of Uplink Shared Channel, cause the reduction of total throughout; And if that the PRACH number is reserved is not enough, the collision that resource is seized in the time of then can increasing UE and initiate to access at random causes accessing the reduction of success rate.Therefore, the setting of PRACH channel density is an important configuration parameters of Operation ﹠ Maintenance System for the very important effect that ensures of the lifting of power system capacity and system service quality.Therefore how the density of reasonable disposition PRACH channel (being the number of PRACH channel in every 10ms) becomes key issue, to guarantee that not only accessing success rate reaches certain requirement, but also will make the density of PRACH channel as far as possible little, thereby reserve resource as much as possible for Uplink Shared Channel.
Configuration for the PRACH channel density in the prior art is undertaken by the deployment engineer, not only need to consider network planning result, also need to consider the prediction of community user quantity and service conditions, and also need to a great extent deployment engineer's experience and individual intuition.For example, covering radius is larger, and the PRACH channel density is higher, and perhaps the community user number is more, and the PRACH channel density is higher, the professional initiation frequently, and the PRACH channel density is higher.
The shortcoming that prior art exists is, relies on manual operation fully for the configuration of PRACH channel density, and the Operation and Maintenance cost is very high, and too relies on personal experience and judgement, and randomness is larger, is difficult for quantizing, and is wayward.The prediction of program results Network Based and community user quantity and service conditions is configured in addition, can because community user quantity and service conditions forecasting inaccuracy are true, cause configuration result inaccurate.In addition, owing to be to think adjustment, therefore when environmental change, often can't in time adjust.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly solve in the prior art owing to rely on manual operation configuration PRACH channel density, and the cost that causes is high and dispose inaccurate defective.
For achieving the above object, one aspect of the present invention proposes a kind of method of adjusting Physical Random Access Channel PRACH channel density, may further comprise the steps: the sum of PRACH and the PRACH number that conflict is arranged in the detection statistics cycle T of base station, the sum of wherein said PRACH comprises conflict free PRACH number and the PRACH number of conflict is arranged; Described base station is according to sum and the described collision probability r that PRACH number calculating PRACH in described statistic period T of conflict is arranged of described PRACH; Described base station is adjusted PRACH density N according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2.
As one embodiment of the present of invention, in the detection statistics cycle T of described base station the sum of PRACH and the PRACH number of conflict is arranged before, also comprise: the initial value of default PRACH density, and described initial value is medium value.
As one embodiment of the present of invention, described base station calculates according to the sum of described PRACH and the described PRACH number that conflict arranged that the collision probability r of PRACH comprises in described statistic period T:
As one embodiment of the present of invention, described base station is adjusted PRACH density N according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 and is comprised: if system is the TDD system of LTE, PRACH density N after then determining to adjust according to following table
If system is the FDD system of LTE, the PRACH density N after then determining to adjust according to following table,
As one embodiment of the present of invention, also comprise: if current PRACH density N has been minimum value, but judge still and need adjust downwards according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2, if perhaps current PRACH density N has been maximum, but still need adjust upward according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2 judgement, then report to the police to operator in described base station.
As one embodiment of the present of invention, also comprise: according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 statistic period T is adjusted.
As one embodiment of the present of invention, also comprise: the PRACH density N value reporting after the adjustment that described base station will obtain is to operation management O﹠amp; M, and according to described O﹠amp; The feedback of M is adjusted PRACH density.
The present invention also proposes a kind of base station on the other hand, comprise statistical module, collision probability computing module and density adjusting module, described statistical module, for detection of the sum and the PRACH number that conflict is arranged of PRACH in the statistic period T, the sum of wherein said PRACH comprises conflict free PRACH number and the PRACH number of conflict is arranged; Described collision probability computing module is used for sum and the described collision probability r that PRACH number calculating PRACH in described statistic period T of conflict is arranged according to described PRACH; Described density adjusting module is used for according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 PRACH density N being adjusted.
As one embodiment of the present of invention, also comprise the preservation module, be used for preserving the initial value of PRACH density, and described initial value is medium value.
As one embodiment of the present of invention, described collision probability computing module calculates described collision probability r according to following formula:,
As one embodiment of the present of invention, the PRACH density N after described density adjusting module is determined to adjust according to following table, if system is the TDD system of LTE,
If system is the FDD system of LTE,
As one embodiment of the present of invention, also comprise the cycle adjusting module, be used for according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 statistic period T being adjusted.
As one embodiment of the present of invention, also comprise alarm module, being used at current PRACH density N has been minimum value, and judge when still needing to adjust downwards according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2, be maximum at current PRACH density N perhaps, and judge according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2 and to report to the police to operator still need adjust upward the time.
As one embodiment of the present of invention, also comprise sending module and receiver module, described sending module is used for PRACH density N value reporting after the adjustment that will obtain to O﹠amp; M; Described receiver module is used for receiving described O﹠amp; The feedback of M, described density adjusting module is according to described O﹠amp; The feedback of M is adjusted PRACH density.
The present invention adjusts the configuration of PRACH density automatically according to the PRACH collision probability by the base station, therefore can not require artificial participation, the Operation and Maintenance cost is very low, and base station of the present invention can be adjusted PRACH density in real time according to environmental change, thereby better service quality and larger throughput are provided.And the present invention depends on community user quantity and service conditions to the adjustment of PRACH density unlike prior art, but depends on the PRACH collision probability, so accuracy rate is high.In addition, the present invention can in time find the deficiency that carrier network is disposed, and in time reports to the police to operator.And meeting of the present invention is adjusted according to changing automatically, therefore along with the carrying out of network operation, and environment stable gradually, what need adjusts frequency and can reduce gradually, has reduced base station and O﹠amp; Information interaction between the M.
The aspect that the present invention adds and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the conflict free PRACH testing result of the embodiment of the invention;
Fig. 2 is the PRACH testing result that conflict is arranged of the embodiment of the invention;
Fig. 3 is the method flow diagram of the adjustment Physical Random Access Channel PRACH channel density of the embodiment of the invention;
Fig. 4 is the architecture of base station figure of one embodiment of the invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
The present invention mainly is, automatically adjust the configuration of PRACH density according to the PRACH collision probability by the base station, therefore can not require artificial participation, the Operation and Maintenance cost is very low, and base station of the present invention can be adjusted PRACH density in real time according to environmental change, thereby better service quality and larger throughput are provided.And the present invention depends on community user quantity and service conditions to the adjustment of PRACH density unlike prior art, but depends on the PRACH collision probability, so accuracy rate is high.
In the process of the normal operation in base station, the PRACH channel can be monitored in the base station always, detects uplink synchronizing signals, has judged whether that the user initiates random access request.If there is the user to initiate to access at random, and without the PRACH conflict, then the testing result of base station will be as shown in Figure 1.If there are simultaneously a plurality of users to use the preamble code of same PRACH channel to initiate at random access, then the testing result of base station will be as shown in Figure 2.Can judge whether to exist from the peak value number that detects like this PRACH conflict.Through PRACH collision probability statistics after a while, can judge whether current PRACH density arranges suitable, and it is adjusted.
As shown in Figure 3, the method flow diagram for the adjustment Physical Random Access Channel PRACH channel density of the embodiment of the invention may further comprise the steps:
Step S301, the initial value of default PRACH density and the initial value of statistic period T were set to medium value such as initial value that can PRACH density, and the initial value of statistic period T is made as smaller value, such as 0.5 hour etc.
Step S302, base station detection statistics cycle T (if initial the adjustment, then be the initial value of statistic period T) sum of interior PRACH and the PRACH number (such as Fig. 2) of conflict is arranged, wherein, the sum of described PRACH comprises conflict free PRACH number (such as Fig. 1) and the PRACH number (such as Fig. 2) of conflict is arranged.
Step S303, the base station is according to the sum of described PRACH and the collision probability r of PRACH number calculating PRACH in statistic period T that conflict is arranged.As one embodiment of the present of invention, the present invention proposes the formula of the collision probability r of PRACH in a kind of concrete counting statistics cycle T, as follows,
Step S304, the base station is adjusted PRACH density N (number of PRACH channel in every 10ms) according to the collision probability r of PRACH in the statistic period T and default the first probability threshold value r1 and the second probability threshold value r2.Wherein the first probability threshold value r1 is the thresholding of judging that PRACH density N should reduce, and the first probability threshold value r1 〉=the second probability threshold value r2, the thresholding of the second probability threshold value r2 for judging that PRACH density N should raise, wherein the occurrence of the first probability threshold value r1 and the second probability threshold value r2 can be determined according to emulation.For example the first probability threshold value r1 can be 0.8, the second probability threshold value r2 and can be 0.3.
In one embodiment of the invention, also different for the adjustment mode of different system PRACH density N, for example, and if system is the TDD system of LTE, the PRACH density N after then determining to adjust according to following table 1,
Table 1
If system is the FDD system of LTE, the PRACH density N after then determining to adjust according to following table 2,
Table 2
Step S305 adjusts statistic period T according to the collision probability r of PRACH in the statistic period T and default the first probability threshold value r1 and the second probability threshold value r2.For example, if r2＜r＜r1 then changes statistic period T into 2T, otherwise it is constant to keep statistic period T.In one embodiment of the invention, for the promptness that guarantees to adjust, can also limit the maximum of statistic period T, such as 1 day etc.After the adjustment of finishing PRACH density N and statistic period T, can be back to step S302, again PRACH density N and statistic period T are adjusted.
In the above embodiment of the present invention, the adjustment of PRACH density N can be by the base station side complete independently.If but the unallowed words of operator, the base station also needs the PRACH density N that above-mentioned steps is obtained to report operation management O﹠amp; M only has through O﹠amp; The approval of M, the base station is just adjusted PRACH density N.In one embodiment of the invention, the base station can report O﹠amp with the PRACH density N that obtains by northbound interface; M, and obtain O﹠amp by this northbound interface; The feedback information of M.
In another above-described embodiment of the present invention, if current PRACH density N has been minimum value, but judge still and need adjust downwards according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2, if perhaps current PRACH density N has been maximum, but still need adjust upward according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2 judgement, then report to the police to operator in the base station, and prompting operator network design herein may need to adjust.
As shown in Figure 4, be the architecture of base station figure of one embodiment of the invention, this base station 100 comprises statistical module 110, collision probability computing module 120 and density adjusting module 130.Statistical module 110 is for detection of the sum and the PRACH number that conflict is arranged of PRACH in the statistic period T, and wherein the sum of PRACH comprises conflict free PRACH number and the PRACH number that conflict is arranged.Collision probability computing module 120 is used for according to the sum of PRACH and the collision probability r of PRACH number calculating PRACH in statistic period T that conflict is arranged.Density adjusting module 130 is used for according to the collision probability r of PRACH in the statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 PRACH density N being adjusted.
As one embodiment of the present of invention, this base station 100 also comprises preserves module 140, be used for preserving the initial value of PRACH density, and described initial value is medium value.
Wherein, this base station 100 also comprises cycle adjusting module 150, is used for according to the collision probability r of PRACH in the statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 statistic period T being adjusted.
As one embodiment of the present of invention, this base station 100 also comprises alarm module 160, being used at current PRACH density N has been minimum value, and judge when still needing to adjust downwards according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2, be maximum at current PRACH density N perhaps, and judge still need adjust upward the time according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2, report to the police to operator, prompting operator network design herein may need to adjust.
As one embodiment of the present of invention, this base station 100 also comprises sending module 170 and receiver module 180.Sending module 170 is used for PRACH density N value reporting after the adjustment that will obtain to O﹠amp; M. receiver module 180 is used for receiving O﹠amp; The feedback of M, density adjusting module 130 is according to O﹠amp; The feedback of M is adjusted PRACH density.
The present invention adjusts the configuration of PRACH density automatically according to the PRACH collision probability by the base station, therefore can not require artificial participation, the Operation and Maintenance cost is very low, and base station of the present invention can be adjusted PRACH density in real time according to environmental change, thereby better service quality and larger throughput are provided.And the present invention depends on community user quantity and service conditions to the adjustment of PRACH density unlike prior art, but depends on the PRACH collision probability, so accuracy rate is high.In addition, the present invention can in time find the deficiency that carrier network is disposed, and in time reports to the police to operator.And meeting of the present invention is adjusted according to changing automatically, therefore along with the carrying out of network operation, and environment stable gradually, what need adjusts frequency and can reduce gradually, has reduced base station and O﹠amp; Information interaction between the M.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present invention is by claims and be equal to and limit.
Claims (10)
1. a method of adjusting Physical Random Access Channel PRACH channel density is characterized in that, may further comprise the steps:
The sum of PRACH and the PRACH number that conflict is arranged in the detection statistics cycle T of base station, the sum of wherein said PRACH comprises conflict free PRACH number and the described PRACH number that conflict is arranged;
Described base station is according to sum and the described collision probability r that PRACH number calculating PRACH in described statistic period T of conflict is arranged of described PRACH;
Described base station is adjusted PRACH density N according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2, and wherein, PRACH density N is the number of PRACH channel in every 10ms;
Wherein, described base station calculates according to the sum of described PRACH and the described PRACH number that conflict arranged that the collision probability r of PRACH comprises in described statistic period T:
Wherein, described base station is adjusted PRACH density N according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 and is comprised:
If system is the TDD system of Long Term Evolution LTE, the PRACH density N after then determining to adjust according to following table,
Wherein, described the first probability threshold value r1 〉=described the second probability threshold value r2;
If system is the FDD system of Long Term Evolution LTE, the PRACH density N after then determining to adjust according to following table,
Wherein, described the first probability threshold value r1 〉=described the second probability threshold value r2.
2. the method for adjustment as claimed in claim 1 PRACH channel density is characterized in that, in the detection statistics cycle T of described base station the sum of PRACH and the PRACH number of conflict is arranged before, also comprise:
The initial value of default PRACH density, and described initial value is medium value.
3. the method for adjustment as claimed in claim 2 PRACH channel density, it is characterized in that, also comprise: if current PRACH density N has been minimum value, but judge still and need adjust downwards according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2, if perhaps current PRACH density N has been maximum, but still need adjust upward according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2 judgement, then report to the police to operator in described base station.
4. the method for adjustment PRACH channel density as claimed in claim 1 is characterized in that, also comprises: according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 statistic period T is adjusted.
5. the method for adjustment PRACH channel density as claimed in claim 1 is characterized in that also comprise: the PRACH density N value reporting after the adjustment that described base station will obtain is to operation management O﹠amp; M, and according to described O﹠amp; The feedback of M is adjusted PRACH density.
6. a base station is characterized in that, comprises statistical module, collision probability computing module and density adjusting module,
Described statistical module, for detection of sum and the PRACH number that conflict is arranged of PRACH in the statistic period T, the sum of wherein said PRACH comprises conflict free PRACH number and the described PRACH number that conflict is arranged;
Described collision probability computing module is used for sum and the described collision probability r that PRACH number calculating PRACH in described statistic period T of conflict is arranged according to described PRACH;
Described density adjusting module is used for according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 PRACH density N being adjusted, and wherein, PRACH density N is the number of PRACH channel in every 10ms;
Wherein, described collision probability computing module calculates described collision probability r according to following formula:
Wherein, the PRACH density N after described density adjusting module is determined to adjust according to following table, if system is the TDD system of LTE,
Wherein, described the first probability threshold value r1 〉=described the second probability threshold value r2;
If system is the FDD system of LTE,
Wherein, described the first probability threshold value r1 〉=described the second probability threshold value r2.
7. base station as claimed in claim 6 is characterized in that, also comprises the preservation module, be used for preserving the initial value of PRACH density, and described initial value is medium value.
8. base station as claimed in claim 6 is characterized in that, also comprises the cycle adjusting module, is used for according to the collision probability r of PRACH in the described statistic period T and default the first probability threshold value r1 and the second probability threshold value r2 statistic period T being adjusted.
9. base station as claimed in claim 6, it is characterized in that, also comprise alarm module, being used at current PRACH density N has been minimum value, and judge when still needing to adjust downwards according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2, be maximum at current PRACH density N perhaps, and judged according to the collision probability r of PRACH and default the first probability threshold value r1 and the second probability threshold value r2 and to report to the police to operator still need adjust upward the time.
10. base station as claimed in claim 6 is characterized in that, also comprises sending module and receiver module,
Described sending module is used for PRACH density N value reporting after the adjustment that will obtain to O﹠amp; M;
Described receiver module is used for receiving described O﹠amp; The feedback of M, described density adjusting module is according to described O﹠amp; The feedback of M is adjusted PRACH density.
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