CN108271161A - Prach roots sequence optimisation method and device in LTE system - Google Patents
Prach roots sequence optimisation method and device in LTE system Download PDFInfo
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Abstract
The present invention provides Prach root sequence optimisation method and devices in a kind of LTE system, belongs to field of communication technology.This method includes：For any cell in planning region, according to the measurement report of any cell, the Ncs values of any cell are determined；According to Ncs values, the required Prach roots sequence quantity of any cell is calculated, and as destination number；When destination number Prach roots sequence quantity existing more than any cell, based on the Prach root sequences of cell each in planning region, the Prach root sequences of any cell are supplemented.Due to can be based on the Timing Advance in measurement report, determine the actually required Prach root sequence quantity of the cell and as destination number, the Prach root sequences of the cell are supplemented according to destination number, so as to which Prach root sequence resources are more reasonably configured for cell, Prach roots sequence resources will not be caused to waste.
Description
Technical field
The present invention relates to field of communication technology, more particularly, to a kind of Prach roots sequence optimisation method in LTE system
And device.
Background technology
Prach (Physical random access in LTE (Long Term Evolution, long term evolution) system
Channel, Physical Random Access Channel) it is that UE (User Equipment, user equipment) carries out initial connection, switching, connection
Re-establish and restore again the unique channel of uplink synchronous.Prach can be used for the random access procedure of user terminal, can realize
Uplink synchronous between user terminal and eNodeB (evolved NodeB, evolved base station).Specifically, user uses Prach
Random access lead code access on channel.Wherein, the corresponding random access lead code of each cell is 64, before random access
Leading code is used to identify UE (User Equipment, user equipment) identity during random access.Each cell is using Prach every time
When, one is chosen from 64 random access lead codes to access Prach.
Random access lead code is made of CP (Cyclic Prefix, cyclic prefix) and targeting sequencing, 64 lead codes pair
There should be 64 targeting sequencings.Wherein, 64 targeting sequencings are Prach roots sequence according to Ncs (Number of cyclic
Shift, cyclically shifted sequences) it is obtained after cyclic shift.Before being obtained after a Prach roots sequence carries out cyclic shift
Lead sequence quantity it is 64 inadequate when, Prach roots sequence can be taken to carry out cyclic shift again, until meeting number requirement.Due to
As a kind of resource, the quantity of Prach root sequences is limited, so as to need that Prach root sequences are allocated.In LTE systems
In system, existing Prach roots sequence allocating method is mainly to set an identical Ncs for each cell in planning region
Value, the Prach root sequence numbers that each cell need to distribute are calculated according to NCS values.
In the implementation of the present invention, it is found that the prior art has at least the following problems：Due to the NCS values of each cell
Be fixed and identical, accordingly calculate the assignable Prach roots sequence quantity of each cell be also it is identical, so as to cause
Some cell Prach roots sequences may be not enough, and some cell Prach roots sequences may be remaining, in turn results in Prach roots
Sequence resources waste.
Invention content
The present invention provides Prach in a kind of LTE system for overcoming the above problem or solving the above problems at least partly
Root sequence optimisation method and device.
According to an aspect of the present invention, Prach roots sequence optimisation method, this method in a kind of LTE system is provided to include：
For any cell in planning region, according to the measurement report of any cell, the Ncs values of any cell are determined；
According to Ncs values, the required Prach roots sequence quantity of any cell is calculated, and as destination number；
When destination number Prach roots sequence quantity existing more than any cell, based on cell each in planning region
Prach root sequences, the Prach root sequences of any cell are supplemented.
According to another aspect of the present invention, Prach roots sequence optimisation device in a kind of LTE system is provided, the device packet
It includes：
Determining module, for for any cell in planning region, according to the measurement report of any cell, determining any
The Ncs values of cell；
Computing module, for according to Ncs values, calculating the required Prach roots sequence quantity of any cell, and as target
Quantity；
Complementary module, for when destination number is more than the existing Prach roots sequence quantity of any cell, based on planning region
The Prach root sequences of each cell in domain, supplement the Prach root sequences of any cell.
The advantageous effect brought of technical solution that the application proposes is：
By for any cell in planning region, according to the measurement report of any cell, determining the Ncs of any cell
Value.According to Ncs values, the required Prach roots sequence quantity of any cell is calculated, and as destination number.When destination number is big
When any cell existing Prach roots sequence quantity, based on the Prach root sequences of cell each in planning region, to any
The Prach root sequences of cell are supplemented.Due to that can determine that the cell is actually required based on the Timing Advance in measurement report
Prach root sequence quantity and as destination number, the Prach root sequences of the cell are supplemented according to destination number, from
And can be that Prach root sequence resources are more reasonably configured in cell, Prach roots sequence resources will not be caused to waste.
In addition, due to can reasonable distribution Prach root sequence resources, so as to which the percent of call completed of respective cell edge customer also compares
It is higher, situations such as wireless access failure, handover failure will not be caused due to the Ncs values of unified configuration are improper and is gone offline.
Description of the drawings
Flow diagrams of the Fig. 1 for Prach root sequence optimisation methods in a kind of LTE system of the embodiment of the present invention；
Flow diagrams of the Fig. 2 for Prach root sequence optimisation methods in a kind of LTE system of the embodiment of the present invention；
Structure diagrams of the Fig. 3 for Prach root sequence optimisation devices in a kind of LTE system of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but be not limited to the scope of the present invention.
In LTE is now netted, it is generally based on the simulation calculation of planning simulation software and matches to carry out the parameter of Prach root sequences
It puts.Specifically, when carrying out the distribution of Prach roots sequence, mainly identical for each cell setting one in planning region
Ncs values calculate the Prach root sequence numbers that each cell need to distribute according to NCS values.Wherein, the NCS values of each cell are solid
Fixed and identical, it is also identical accordingly to calculate the assignable Prach roots sequence quantity of each cell.In these cells,
Some cell Prach roots sequences may be not enough, and some cell Prach roots sequences may be remaining.This causes Prach root sequences
Row resource is unable to reasonable distribution, and the percent of call completed of respective cell edge customer is also than relatively low.In addition, also create Prach root sequences
The waste of resource.
For the problems of the prior art, an embodiment of the present invention provides Prach roots sequence optimisation sides in a kind of LTE system
Method.When carrying out Prach planning due to planning software, it has to be considered that the radius of society of whole region, so as to embodiment and after
Continuous embodiment mainly optimizes the Prach root sequences of the too small situations of Ncs, i.e. cell distribution when carrying out Prach root sequence optimisations
Arrange insufficient situation.Situation excessive Ncs is not considered temporarily, so as not to it is excessively frequent because changing, it causes in entire planning region
The distribution of cell Prach roots sequence is excessively chaotic.Referring to Fig. 1, method flow provided in this embodiment includes：101st, for planning region
Any cell in domain according to the measurement report of any cell, determines the Ncs values of any cell；102nd, it according to Ncs values, calculates
Any required Prach roots sequence quantity of cell, and as destination number；103rd, when destination number has more than any cell
Prach root sequence quantity when, based on the Prach root sequences of cell each in planning region, to the Prach root sequences of any cell
Row are supplemented.
Method provided in an embodiment of the present invention, by for any cell in planning region, according to the survey of any cell
Amount report determines the Ncs values of any cell.According to Ncs values, the required Prach roots sequence quantity of any cell is calculated, and make
For destination number.When destination number Prach roots sequence quantity existing more than any cell, based on each small in planning region
The Prach root sequences in area supplement the Prach root sequences of any cell.Due to can be carried based on the time in measurement report
Preceding amount determines the actually required Prach root sequence quantity of the cell and as destination number, according to destination number to the cell
Prach root sequences are supplemented, and so as to which Prach root sequence resources are more reasonably configured for cell, will not cause Prach roots
Sequence resources waste.
In addition, due to can reasonable distribution Prach root sequence resources, so as to which the percent of call completed of respective cell edge customer also compares
It is higher, situations such as wireless access failure, handover failure will not be caused due to the Ncs values of unified configuration are improper and is gone offline.
As a kind of alternative embodiment, according to the measurement report of any cell, the Ncs values of any cell are determined, including：
Obtain the Timing Advance in measurement report；
According to Timing Advance, the Ncs values of any cell are calculated.
As a kind of alternative embodiment, according to Timing Advance, the Ncs values of any cell are calculated, including：
According to Timing Advance, the corresponding lower bound of Ncs values is calculated；
Based on the Ncs values for being more than lower bound in Ncs value tables, the Ncs values of any cell are determined.
As a kind of alternative embodiment, according to Timing Advance, the corresponding lower bound of Ncs values is calculated, including：
Based on the corresponding leading form of any cell, the sample length of Prach roots sequence under leading form is calculated；
According to sample length, Timing Advance, maximum multipath time delay is expanded and search time length forward, calculates Ncs values
Corresponding lower bound.
As a kind of alternative embodiment, according to Ncs values, the required Prach roots sequence quantity of any cell is calculated, is wrapped
It includes：
Based on the corresponding leading form of any cell, the length of Prach roots sequence under leading form is determined；
The quantity, length and Ncs values of lead code are corresponded to according to any cell, calculates the required Prach roots of any cell
Sequence quantity.
As a kind of alternative embodiment, according to Ncs values, after calculating the required Prach roots sequence quantity of any cell,
It further includes：
Based on the Ncs values for being more than lower bound in Ncs value tables, when there are the Prach root sequences that multiple Ncs values correspondence is calculated
When number of columns is identical, Ncs value of the maximum value in multiple Ncs values as any cell is selected.
As a kind of alternative embodiment, based on the Prach root sequences of cell each in planning region, to any cell
Prach root sequences are supplemented, including：
When there is reserved Prach root sequences in any cell, the reserved Prach roots sequence based on any cell, to any
The Prach roots sequence of cell carries out first time supplement.
As a kind of alternative embodiment, based on the Prach root sequences of cell each in planning region, to any cell
Prach root sequences are supplemented, including：
Destination number is still greater than appointing after reserved Prach roots sequence is not present in any cell or is supplemented by first time
One cell supplement after Prach root sequence quantity when, in planning region and positioned at any cell reuse distance except
Other cells calculate the distance between each cell respective base station and any cell respective base station in other cells, obtain it
The corresponding distance set of its cell；
Maximum distance is chosen from distance set, the Prach root sequences based on maximum distance respective cell, to any cell
Prach roots sequence carry out second and supplement, supplement process is repeated based on distance set, until reaching destination number.
As a kind of alternative embodiment, based on the Prach root sequences of cell each in planning region, to any cell
After Prach root sequences are supplemented, further include：
For all cells in planning region, if requiring supplementation with Prach root sequences during Prach root sequence optimisations
The number of cells of row is more than predetermined threshold value, carries out Prach planning to planning region again, is that all cells are unified in planning region
New Ncs values are set, and new Ncs values are more than the Ncs values before carrying out Prach root sequence optimisations.
The alternative embodiment that any combination forms the present invention may be used, herein no longer in above-mentioned all optional technical solutions
It repeats one by one.
Based on the content in above-mentioned Fig. 1 corresponding embodiments, an embodiment of the present invention provides Prach roots in a kind of LTE system
Sequence optimisation method.Referring to Fig. 2, method flow provided in this embodiment includes：201st, for any cell in planning region,
According to the measurement report of any cell, the Ncs values of any cell are determined；202nd, according to Ncs values, it is required to calculate any cell
Prach root sequence quantity, and as destination number；203rd, when destination number is more than the existing Prach roots sequence number of any cell
During amount, based on the Prach root sequences of cell each in planning region, the Prach root sequences of any cell are supplemented；204、
For all cells in planning region, if requiring supplementation with the cell of Prach root sequences during Prach root sequence optimisations
Quantity is more than predetermined threshold value, carries out Prach planning to planning region again, is that the unified setting of all cells is new in planning region
Ncs values.
Wherein, 201, for any cell in planning region, according to the measurement report of any cell, any cell is determined
Ncs values.
For convenience of description, this step and subsequent step are mainly for the Prach root sequences of a cell in planning region
Optimization process illustrates.The content that each cell in planning region may be used in this step and subsequent step carries out
Prach root sequence optimisations, the present embodiment are not especially limited this.
About the measurement report according to any cell, the mode of the Ncs values of any cell is determined, the present embodiment does not make this
It is specific to limit, including but not limited to：Obtain the Timing Advance in measurement report；According to Timing Advance, any cell is calculated
Ncs values.Wherein, MR (Measurement Report, measurement report) is one of Main Basiss for assessing wireless environment quality,
TA (Timing Advance, Timing Advance) can be included at least in MR.
After the corresponding Timing Advance of cell is obtained, due to being abnormal there may be the corresponding Timing Advance of cell
Value, arranges so as to Timing Advance corresponding to cell.The present embodiment is not to arranging the corresponding Timing Advance of cell
Mode specifically limit, including but not limited to：Whether within a preset range to judge the corresponding Timing Advance of cell；Work as presence
Timing Advance within a preset range, using Timing Advance not within a preset range as exceptional value, and does not remove exceptional value.
After the exceptional value in removing Timing Advance, the Ncs values of any cell further according to Timing Advance, can be calculated.
The present embodiment is not to according to Timing Advance, the mode for calculating the Ncs values of any cell limits specifically, including but not limited to：
According to Timing Advance, the corresponding lower bound of Ncs values is calculated；Based on the Ncs values for being more than lower bound in Ncs value tables, determine any small
The Ncs values in area.
In order to adapt to different cell sizes, 5 kinds of leading forms defined in LTE system, respectively leading form 0 to
Leading format 4.Based on different leading forms, the present embodiment is not to according to Timing Advance, calculating the corresponding lower bound of Ncs values
Mode specifically limits, including but not limited to：Based on the corresponding leading form of any cell, Prach roots under leading form are calculated
The sample length of sequence；According to sample length, Timing Advance, maximum multipath time delay is expanded and search time length forward, meter
Calculate the corresponding lower bound of Ncs values.
Specifically, before the corresponding lower bound of Ncs values is calculated, the parameter being first related to subsequent calculations process is said
It is bright.Wherein, TcpFor the length of cyclic prefix CP, TRTTFor two-way time.TDSFor maximum multipath delay spread, TADTo search for forward
Time span, Tpreamble_SSample length for Prach root sequences.Based on Tcp、TRTT、TDSWith TADBetween relationship, can obtain
Following formula (1)
Tcp＞ TRTT+TDS+TAD (1)
Based on TcpWith Ncs and Tpreamble_SBetween relationship, following formula (2) can obtain by formula (1)：
NCS.Tpreamble_S＞ 2TA+TDS+TAD (2)
For leading form 0-3, the length N of Prach root sequencesZC=839, the corresponding time span of targeting sequencing is 800 μ
s.Correspondingly, the sample length T of Prach roots sequencepreamble_S(0-3)=800/839 (μ s).
For leading format 4, the length N of Prach root sequencesZC=139, the corresponding time span of targeting sequencing is 133 μ s.
Correspondingly, the sample length T of Prach roots sequencepreamble_S(4)=133/839 (μ s).Wherein, TDSEmulation data for 5 (μ s),
TAD=2 (μ s).The unit of TA is Ts, 1Ts=1/30.72 (μ s).
Based on above-mentioned parameter value, the corresponding Ncs values formula of the leading form of difference can be retrieved.For down-going synchronous error,
For leading form 0-3, corresponding Ncs values formula can refer to following formula (3)：
NCS1.04873 (2TA+T of ＞DS+TAD) (3)
For leading format 4, corresponding Ncs values formula can refer to following formula (4)：
NCS1.0425 (2TA+T of ＞DS+TAD) (4)
Wherein, in formula (3) and formula (4), the numerical value behind greater-than sign is the corresponding lower bound of Ncs values.By upper
The corresponding lower bound of Ncs values under leading form 0-3 can be calculated by stating formula (3), can be calculated by above-mentioned formula (4) leading
The corresponding lower bound of Ncs values under format 4.
After the corresponding lower bound of Ncs values is calculated, it can be determined any based on the Ncs values for being more than lower bound in Ncs value tables
The Ncs values of cell.Wherein, Ncs values table can refer to as shown in following table (5)：
Table (5)
For example, for any cell in planning region, if it is 14 that the corresponding lower bound of Ncs values, which removes the value after integer,
It can determine that the Ncs values of the cell can be 15,18,22 ..., 279 based on table (5).But in order to save Prach root sequence resources,
Generally take Ncs values 15 minimum in the above-mentioned value for meeting condition.
Wherein, 202, according to Ncs values, the required Prach roots sequence quantity of any cell is calculated, and as number of targets
Amount.
The present embodiment is not to according to Ncs values, the mode for calculating the required Prach roots sequence quantity of any cell is made specifically
It limits, including but not limited to：Based on the corresponding leading form of any cell, the length of Prach roots sequence under leading form is determined；
The quantity, length and Ncs values of lead code are corresponded to according to any cell, calculates the required Prach roots sequence quantity of any cell.
The above-mentioned required Prach roots sequence quantity of any cell of calculating generates 64 required Prach of lead code
The calculating process of root sequence number can refer to equation below (6)：
In above-mentioned formula (6), K be the required Prach roots sequence quantity of any cell, NCSAs the above process calculates
Obtained Ncs values, NZCLength for the corresponding Prach roots sequence of the leading form of difference.Wherein, the Prach root sequences being calculated
Number of columns can refer to as shown in following table (7)：
Table (7)
It should be noted that respective cell institute is calculated it is found that when Ncs values are 15,18,22 and 26 by upper table (7)
The Prach root sequence numbers needed are identical, that is, are 2.In order in the case where distribution root sequence number is identical, provide cell
More surpluses can take larger Ncs values as possible.Specifically, according to Ncs values, the required Prach roots of any cell are calculated
After sequence quantity, the Ncs values for being more than lower bound in Ncs value tables are also based on, to be calculated when there are multiple Ncs values correspondences
Prach root sequence quantity it is identical when, select Ncs value of the maximum value in multiple Ncs values as any cell.It corresponds in upper table
(7) in, the 26 Ncs values as the cell can be chosen.
Wherein, 203, when destination number is more than the existing Prach roots sequence quantity of any cell, based in planning region
The Prach root sequences of each cell, supplement the Prach root sequences of any cell.
Before this step is performed, for any cell, spare Prach root sequences can be also first imported, i.e., according to unified
The Prach root sequences planned of Ncs values, and be used as the existing Prach roots sequence of the cell.Correspondingly, it is small that this can be obtained
The existing Prach roots sequence quantity in area.
It, can be small with this by destination number by above-mentioned steps 202 after destination number is calculated for any cell
The existing Prach roots sequence quantity in area is compared, so as to supplement Prach root sequences for the cell according to comparison result, so as to
Realize the optimization of Prach root sequences.
In the case of destination number Prach roots sequence existing more than the cell, the present embodiment is not to being based on planning region
The Prach root sequences of each cell in domain, the mode supplemented the Prach root sequences of any cell specifically limit, packet
It includes but is not limited to：When there is reserved Prach root sequences in any cell, the reserved Prach roots sequence based on any cell, to appointing
The Prach roots sequence of one cell carries out first time supplement.
Wherein, the Prach roots sequence of all cells can preserve in the database in planning region, and cell is reserved
Prach roots sequence has as distributed to the cell, but the cell it is also useless on Prach root sequences.The above process mainly exists
It is searched whether in database there are the Prach root sequences that the cell is reserved, when there are the Prach roots that the cell is reserved in database
During sequence, the reserved Prach roots sequence of the cell can be directly acquired, and is supplemented to the cell.
During first time supplements, the reserved Prach roots sequence of the cell, Huo Zhejing may be not present in database
Crossing the Prach root sequence quantity of the cell after supplementing for the first time still could not reach destination number.At this point, planning region can be invoked at
The Prach root sequences of the cell reuse other cells except in domain, to be supplemented.
Correspondingly, the present embodiment is not to the Prach root sequences based on any cell, to the Prach root sequences of any cell
The mode supplemented specifically limits, including but not limited to：When reserved Prach root sequences, Huo Zhejing is not present in any cell
When crossing after supplementing for the first time the Prach root sequence quantity after destination number is supplemented still greater than any cell, in planning region
Other cells interior and except any cell reuse distance, calculate each cell respective base station in other cells with it is any
The distance between cell respective base station obtains the corresponding distance set of other cells；Maximum distance, base are chosen from distance set
Prach root sequences in maximum distance respective cell carry out second to the Prach roots sequence of any cell and supplement, based on away from
Supplement process is repeated from set, until reaching destination number.
For any cell, the above process is mainly based upon distance set, and selection one is away from the cell apart from farthest mesh
Cell is marked, the Prach root sequences of Target cell are supplemented to the cell.After being supplemented by second, if after cell supplement
Prach root sequence quantity still could not reach destination number, then one cell base station of reselection is small away from this from distance set
The farthest Target cell of area's respective base station time, and supplement process is repeated, the Prach root sequence quantity after cell supplement reaches
To destination number.If the Prach root sequence resources of all Target cells are that the cell supplemented Prach root sequences in distance set
Row, and the Prach root sequence quantity of the cell still could not reach destination number after the completion of supplementing.At this point it is possible to prompt correlation
The configuration work personnel cell lacks available Prach roots sequence, and the present embodiment is not especially limited this.
Wherein, 204, for all cells in planning region, if being required supplementation with during Prach root sequence optimisations
The number of cells of Prach root sequences is more than predetermined threshold value, Prach planning is carried out to planning region again, for institute in planning region
There is cell that new Ncs values are uniformly set.
By above-mentioned steps 201 to step 203, the Prach root sequences that each cell needs in planning region can be calculated
Number of columns, i.e. destination number, and when destination number is not achieved in the existing Prach roots sequence quantity of cell, to the Prach of cell
Root sequence is supplemented.If the number of cells that Prach root sequences are required supplementation in planning region is excessive, i.e., more than predetermined threshold value,
Then illustrating before Prach root sequence optimisations are carried out, the Ncs values that unification is configured when carrying out Prach planning are simultaneously unreasonable, so as to
Can Prach planning be carried out to planning region again, new Ncs values are uniformly set for all cells in planning region.Wherein, newly
Ncs values are more than the Ncs values before carrying out Prach root sequence optimisations.
Method provided in an embodiment of the present invention, by for any cell in planning region, according to the survey of any cell
Amount report determines the Ncs values of any cell.According to Ncs values, the required Prach roots sequence quantity of any cell is calculated, and make
For destination number.When destination number Prach roots sequence quantity existing more than any cell, based on each small in planning region
The Prach root sequences in area supplement the Prach root sequences of any cell.Due to can be carried based on the time in measurement report
Preceding amount determines the actually required Prach root sequence quantity of the cell and as destination number, according to destination number to the cell
Prach root sequences are supplemented, and so as to which Prach root sequence resources are more reasonably configured for cell, will not cause Prach roots
Sequence resources waste.
In addition, due to can reasonable distribution Prach root sequence resources, so as to which the percent of call completed of respective cell edge customer also compares
It is higher, situations such as wireless access failure, handover failure will not be caused due to the Ncs values of unified configuration are improper and is gone offline.
Finally, it is more than in advance by requiring supplementation with the number of cells of Prach root sequences during Prach root sequence optimisations
If during threshold value, Prach planning is re-started, can again be divided in time in the case of Prach root sequence resources unreasonable distributions
With Prach root sequence resources.
An embodiment of the present invention provides Prach roots sequence optimisation device in a kind of LTE system, the device is above-mentioned for performing
Prach roots sequence optimisation method in a kind of LTE system that the corresponding embodiments of Fig. 1 or Fig. 2 are provided.Referring to Fig. 3, the device packet
It includes：
Determining module 301, for for any cell in planning region, according to the measurement report of any cell, determining
The Ncs values of any cell；
Computing module 302, for according to Ncs values, calculating the required Prach roots sequence quantity of any cell, and conduct
Destination number；
Complementary module 303, for when destination number is more than the existing Prach roots sequence quantity of any cell, based on rule
The Prach root sequences of each cell in partition domain, supplement the Prach root sequences of any cell.
As a kind of alternative embodiment, determining module 301, including：
Acquiring unit, for obtaining the Timing Advance in measurement report；
Computing unit, for according to Timing Advance, calculating the Ncs values of any cell.
As a kind of alternative embodiment, computing unit, including：
Computation subunit, for according to Timing Advance, calculating the corresponding lower bound of Ncs values；
Determination subelement, for based on the Ncs values for being more than lower bound in Ncs value tables, determining the Ncs values of any cell.
As a kind of alternative embodiment, computation subunit for being based on the corresponding leading form of any cell, calculates leading
The sample length of Prach roots sequence under form；It is expanded according to sample length, Timing Advance, maximum multipath time delay and searched forward
Rope time span calculates the corresponding lower bound of Ncs values.
As a kind of alternative embodiment, computing module 302, for being based on the corresponding leading form of any cell, before determining
Lead the length of Prach roots sequence under form；The quantity, length and Ncs values of lead code are corresponded to according to any cell, is calculated any small
The required Prach roots sequence quantity in area.
As a kind of alternative embodiment, which further includes：
Selecting module, for based on the Ncs values for being more than lower bound in Ncs value tables, to be calculated when there are multiple Ncs values correspondences
When the Prach root sequence quantity arrived is identical, Ncs value of the maximum value in multiple Ncs values as any cell is selected.
As a kind of alternative embodiment, complementary module 303, for when there is reserved Prach root sequences in any cell, base
In the reserved Prach roots sequence of any cell, first time supplement is carried out to the Prach roots sequence of any cell.
As a kind of alternative embodiment, complementary module 303, for work as any cell be not present reserved Prach roots sequence or
Person by first time supplement after destination number still greater than any cell supplement after Prach root sequence quantity when, for planning
Other cells in region and except any cell reuse distance, calculate each cell respective base station in other cells with
The distance between any cell respective base station obtains the corresponding distance set of other cells；
Maximum distance is chosen from distance set, the Prach root sequences based on maximum distance respective cell, to any cell
Prach roots sequence carry out second and supplement, supplement process is repeated based on distance set, until reaching destination number.
As a kind of alternative embodiment, which further includes：
Planning module, for for all cells in planning region, if being needed during Prach root sequence optimisations
The number of cells for supplementing Prach root sequences is more than predetermined threshold value, carries out Prach planning to planning region again, is planning region
Interior all cells uniformly set new Ncs values, and new Ncs values are more than the Ncs values before carrying out Prach root sequence optimisations.
Device provided in an embodiment of the present invention, by for any cell in planning region, according to the survey of any cell
Amount report determines the Ncs values of any cell.According to Ncs values, the required Prach roots sequence quantity of any cell is calculated, and make
For destination number.When destination number Prach roots sequence quantity existing more than any cell, based on each small in planning region
The Prach root sequences in area supplement the Prach root sequences of any cell.Due to can be carried based on the time in measurement report
Preceding amount determines the actually required Prach root sequence quantity of the cell and as destination number, according to destination number to the cell
Prach root sequences are supplemented, and so as to which Prach root sequence resources are more reasonably configured for cell, will not cause Prach roots
Sequence resources waste.
In addition, due to can reasonable distribution Prach root sequence resources, so as to which the percent of call completed of respective cell edge customer also compares
It is higher, situations such as wireless access failure, handover failure will not be caused due to the Ncs values of unified configuration are improper and is gone offline.
Finally, it is more than in advance by requiring supplementation with the number of cells of Prach root sequences during Prach root sequence optimisations
If during threshold value, Prach planning is re-started, can again be divided in time in the case of Prach root sequence resources unreasonable distributions
With Prach root sequence resources.
Finally, the present processes are only preferable embodiment, are not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of Prach roots sequence optimisation method in LTE system, which is characterized in that the method includes：
For any cell in planning region, according to the measurement report of any cell, the Ncs of any cell is determined
Value；
According to the Ncs values, any required Prach roots sequence quantity of cell is calculated, and as destination number；
When the destination number is more than the existing Prach roots sequence quantity of any cell, based in the planning region
The Prach root sequences of each cell, supplement the Prach root sequences of any cell.
2. according to the method described in claim 1, it is characterized in that, the measurement report according to any cell, determines
The Ncs values of any cell, including：
Obtain the Timing Advance in the measurement report；
According to the Timing Advance, the Ncs values of any cell are calculated.
3. according to the method described in claim 2, it is characterized in that, described according to the Timing Advance, calculate described any
The Ncs values of cell, including：
According to the Timing Advance, the corresponding lower bound of Ncs values is calculated；
Based on the Ncs values for being more than the lower bound in Ncs value tables, the Ncs values of any cell are determined.
4. according to the method described in claim 3, it is characterized in that, described according to the Timing Advance, calculating Ncs values correspond to
Lower bound, including：
Based on the corresponding leading form of any cell, the sample length of Prach root sequences under the leading form is calculated；
According to the sample length, the Timing Advance, maximum multipath time delay is expanded and search time length forward, calculates
The corresponding lower bound of Ncs values.
It is 5. according to the method described in claim 1, it is characterized in that, described according to the Ncs values, calculating any cell institute
The Prach root sequence quantity needed, including：
Based on the corresponding leading form of any cell, the length of Prach root sequences under the leading form is determined；
The quantity, the length and the Ncs values of lead code are corresponded to according to any cell, is calculated needed for any cell
The Prach root sequence quantity wanted.
6. the method according to claim 1 or 3, which is characterized in that it is described according to the Ncs values, it calculates described any small
After the required Prach roots sequence quantity in area, further include：
Based on the Ncs values for being more than the lower bound in Ncs value tables, when there are the Prach root sequences that multiple Ncs values correspondence is calculated
When number of columns is identical, Ncs value of the maximum value as any cell in the multiple Ncs values is selected.
It is 7. according to the method described in claim 1, it is characterized in that, described based on cell each in the planning region
Prach root sequences supplement the Prach root sequences of any cell, including：
When any cell has reserved Prach root sequences, the reserved Prach roots sequence based on any cell is right
The Prach roots sequence of any cell carries out first time supplement.
8. the method according to claim 1 or 7, which is characterized in that described based on cell each in the planning region
Prach root sequences supplement the Prach root sequences of any cell, including：
The destination number is still big after reserved Prach roots sequence is not present in any cell or is supplemented by first time
When Prach root sequence quantity after any cell supplement, in the planning region and positioned at described any small
Other cells except area's multiplex distance calculate each cell respective base station in other cells and any cell pair
The distance between base station is answered, obtains the corresponding distance set of other cells；
Maximum distance is chosen from the distance set, the Prach root sequences based on the maximum distance respective cell, to described
The Prach roots sequence of any cell carries out second and supplements, and supplement process is repeated based on the distance set, until reaching
The destination number.
It is 9. according to the method described in claim 1, it is characterized in that, described based on cell each in the planning region
Prach root sequences after supplementing the Prach root sequences of any cell, further include：
For all cells in the planning region, if requiring supplementation with Prach root sequences during Prach root sequence optimisations
The number of cells of row is more than predetermined threshold value, carries out Prach planning to the planning region again, is to own in the planning region
Cell uniformly sets new Ncs values, and the new Ncs values are more than the Ncs values before carrying out Prach root sequence optimisations.
10. Prach roots sequence optimisation device in a kind of LTE system, which is characterized in that described device includes：
Determining module, for for any cell in planning region, according to the measurement report of any cell, determining described
The Ncs values of any cell；
Computing module, for according to the Ncs values, calculating any required Prach roots sequence quantity of cell, and conduct
Destination number；
Complementary module, for when the destination number is more than the existing Prach roots sequence quantity of any cell, based on institute
The Prach root sequences of each cell in planning region are stated, the Prach root sequences of any cell are supplemented.
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| CN102281542A (en) * | 2011-07-29 | 2011-12-14 | 上海华为技术有限公司 | Method and device for allocating Zadoff-Chu (ZC) root sequence indexes |
| CN102687571A (en) * | 2009-10-07 | 2012-09-19 | 株式会社Ntt都科摩 | Mobile communication method and radio base station |
| WO2014119898A1 (en) * | 2013-01-29 | 2014-08-07 | Lg Electronics Inc. | Method and apparatus for configuring random access sequence length for high carrier frequency band in wireless communication system |
| WO2014123698A2 (en) * | 2013-02-06 | 2014-08-14 | Qualcomm Incorporated | Determination of ncs parameter and logical root sequence assignments |
| US20140376494A1 (en) * | 2007-02-12 | 2014-12-25 | Lg Electronics Inc. | Methods and procedures for high speed ue access |
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| US20140376494A1 (en) * | 2007-02-12 | 2014-12-25 | Lg Electronics Inc. | Methods and procedures for high speed ue access |
| CN102687571A (en) * | 2009-10-07 | 2012-09-19 | 株式会社Ntt都科摩 | Mobile communication method and radio base station |
| CN102281542A (en) * | 2011-07-29 | 2011-12-14 | 上海华为技术有限公司 | Method and device for allocating Zadoff-Chu (ZC) root sequence indexes |
| WO2014119898A1 (en) * | 2013-01-29 | 2014-08-07 | Lg Electronics Inc. | Method and apparatus for configuring random access sequence length for high carrier frequency band in wireless communication system |
| WO2014123698A2 (en) * | 2013-02-06 | 2014-08-14 | Qualcomm Incorporated | Determination of ncs parameter and logical root sequence assignments |
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