CN102651868B - Expansion cell scrambling code planning method and system - Google Patents

Expansion cell scrambling code planning method and system Download PDF

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CN102651868B
CN102651868B CN201110043412.XA CN201110043412A CN102651868B CN 102651868 B CN102651868 B CN 102651868B CN 201110043412 A CN201110043412 A CN 201110043412A CN 102651868 B CN102651868 B CN 102651868B
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community
planning
drive test
xin jia
cell
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CN102651868A (en
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徐坤
张海
俞胜兵
张旭东
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ZTE Corp
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Abstract

The invention relates to the field of wireless communication, and provides an expansion cell scrambling code planning method. The method comprises the steps as follows: determining the address of a new cell; planning a drive test route and determining cells adjacent to the new cell; acquiring drive test data of the cells adjacent to the new cell and carrying out normalization processing; and acquiring a relative field intensity of the cells adjacent to the new cell for the new cell, determining scrambling code priority according to the field intensity value, and distributing the scrambling code of the new cell according to the priority. The invention further provides an expansion cell scrambling code planning system. The expansion cell scrambling code planning method and the cell scrambling code planning system, which are provided by the invention, can avoid that the distribution of the scrambling code of the new cell depends on experiences in a conventional mode so as to generate indeterminacy.

Description

The method and system of dilatation cell scrambling planning
Technical field
The present invention relates to wireless communication technology field, particularly relate to the method and system of a kind of dilatation cell scrambling planning.
Background technology
As everyone knows, 3-G (Generation Three mobile communication system) adopts the wireless access way of code division multiple access, and community uses scrambler with up detection user.Because scrambler can be used for distinguishing cell, can be used for the initial access network of travelling carriage, cell reselection and switching etc., so being distributed in systems organization of scrambler is very important.
In the dilatation networking of reality, the factors such as the irregular distribution in position of consideration wireless propagation environment, base station, in a panel region Xin Jia community, carry out initial cell scrambler resource distribution and become complex.The principle that traditional planning mode adopts all communities to redistribute, consider that the factors such as distance, angle carry out integrated planning, the result of planning reconfigures all communities in existing network again, and this is applicable for the network that scale is less.Good for operation conditions, larger network, the configuration changing whole network is gone just to the community that some newly add, obviously lose more than gain, the cost paid is very large, and for the adjustment that the network effect after planning needs again for a long time, this is for operator, is obviously not very willing.Another planning mode is when not changing the configuration of existing network scrambler, and according to the access times of scrambler, the factors such as code word multiplex distance, but can deviation to some extent for the accuracy after adjustment artificially to Xin Jia community manual configuration.
Summary of the invention
Main purpose of the present invention is the method and system providing a kind of dilatation cell scrambling to plan, when being intended to not change existing network cell scrambling allocation plan, with the scrambler of minimum cost planning dilatation community.
The invention provides the method for a kind of dilatation cell scrambling planning, comprise the following steps:
Determine the site of Xin Jia community;
Planning drive test circuit, determines community adjacent around Xin Jia community;
Gather neighbor cell drive test data and be normalized;
Obtain the relative field strength value of neighbor cell for Xin Jia community, according to this value determination scrambler priority, and according to priority height distribution newly adds cell scrambling.
Preferably, the site of the described Xin Jia of determination community comprises:
According to the planning region of Xin Jia community, choose first three community that covering radius in peripheral cell is maximum;
Calculate the distance of Xin Jia community and peripheral cell;
Determine the position of Xin Jia community.
Preferably, described planning drive test circuit, determines the community adjacent with Xin Jia community and comprises:
The underlapped planning region in Ruo Xinjia community and neighbor cell, then the position of the signal acquisition point of drive test circuit is selected apart from being greater than respective radius of society respectively by the website of this Dian Daoliang community;
There is overlapping planning region Ruo Xinjia community and neighbor cell, then the signals collecting point selection of drive test circuit is in this overlapping region.
Preferably, also comprise after the step of site performing the described Xin Jia of determination community:
Judge whether there is scrambler to be allocated in available scrambler set, if having, Random assignment scrambler is to Xin Jia community; If no, then Execution plan drive test circuit, determines community adjacent around Xin Jia community.
Preferably, described collection neighbor cell drive test data being normalized comprises:
Equalization process is done to signal strength BIN lattice belonging to certain community, obtains each BIN lattice are under the jurisdiction of the signal strength value of this community through equalization process;
To the signal strength average that each BIN lattice point collects, do normalized.
Preferably, also comprise after the step of site performing the described Xin Jia of determination community:
Judge whether there is scrambler to be allocated in available scrambler set, if having, Random assignment scrambler is to Xin Jia community; If no, then Execution plan drive test circuit, determines community adjacent around Xin Jia community.
The invention provides the system of a kind of dilatation cell scrambling planning, comprising:
Site analysis module, for determining the site of Xin Jia community;
Drive test planning module, for planning drive test circuit, determines community adjacent around Xin Jia community;
Data acquisition module, for gathering neighbor cell drive test data and being normalized;
Central processing module, for calculating the relative field strength value of neighbor cell for Xin Jia community, according to this value determination scrambler priority, and according to priority distributes and newly adds cell scrambling.
Preferably, described site analysis module specifically for:
According to the planning region of Xin Jia community, choose first three community that covering radius in peripheral cell is maximum;
Calculate the distance of Xin Jia community and peripheral cell;
Determine the position of Xin Jia community.
Preferably, described drive test planning module specifically for:
The underlapped planning region in Ruo Xinjia community and neighbor cell, then the position of the signal acquisition point of drive test circuit is selected apart from being greater than respective radius of society respectively by the website of this Dian Daoliang community;
There is overlapping planning region Ruo Xinjia community and neighbor cell, then the signals collecting point selection of drive test circuit is in this overlapping region.
Preferably, described data acquisition module specifically for:
Equalization process is done to signal strength BIN lattice belonging to certain community, obtains each BIN lattice are under the jurisdiction of the signal strength value of this community through equalization process;
To the signal strength value that each BIN lattice point collects, do normalized.
Preferably, said system also comprises:
Judge module, for judging whether there is scrambler to be allocated in available scrambler set, if having, Random assignment scrambler is to Xin Jia community; If no, then Execution plan drive test circuit, determines community adjacent around Xin Jia community.
The method of dilatation cell scrambling planning provided by the present invention or system, first determine newly to add cell sites, to make rational planning for again drive test circuit, gather the drive test data of this circuit, the drive test data of each community of statistical analysis, according to the lower principle of the larger scrambler priority of interference to newly adding cell allocation scrambler, guarantees that network engineering parameter is more reasonable, under avoiding traditional mode, dependence experience carries out scrambler distribution to Xin Jia community, thus the uncertainty brought.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method for dilatation cell scrambling planning in an embodiment of the invention;
Fig. 2 is the flow chart of steps of the site determining Xin Jia community in one embodiment of the present of invention;
Fig. 3 is the structural representation of one embodiment of the present of invention Zhong Xinjia community and existing community.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 shows in an embodiment of the invention, begins to take shape at network, needs the network capacity extension, and when not changing existing network parameter configuration in engineering construction, to the method flow newly adding cell allocation scrambler, this flow process comprises the following steps:
Step S10, determines the site of Xin Jia community; If existing cell sites, then forward step S20 to, otherwise, obtain according to the covering radius of community and other factors planning.In one embodiment, also can comprise after execution step S10:
Judge whether there is scrambler to be allocated in available scrambler set, if having, Random assignment scrambler is to Xin Jia community; If no, then Execution plan drive test circuit, determines community adjacent around Xin Jia community.
Step S20, planning drive test circuit, determines community adjacent around Xin Jia community; In one embodiment, the planning of drive test circuit must be the edge of existing network neighbor cell and Xin Jia community, guarantee that the pickup area of drive test data is all consistent for all neighbor cells, because test data is the signal that will gather neighbor cell around, adopt unified principle to data analysis, just there is comparativity.Ruo Xinjia community and planning region, neighbor cell underlapped, then the website distance that the point of drive test circuit meets this Dian Daoliang community is greater than the zone line of respective radius of society respectively.There is overlapping planning region Ruo Xinjia community and neighbor cell, then the point of drive test circuit is selected in this overlapping region as far as possible.For all communities, all to ensure that the drive test data point collected is all signal strength values of all neighbor cells and Xin Jia cell edge region.
Step S30, gathers neighbor cell drive test data and is normalized; Specifically can comprise: equalization process is done to signal strength BIN lattice belonging to certain community, obtain each BIN lattice are under the jurisdiction of the signal strength value of this community through equalization process; To the signal strength average that each BIN lattice point collects, do normalized.
Step S40, obtains the relative field strength value of neighbor cell for Xin Jia community, and according to this value determination scrambler priority, and according to priority height distribution newly adds cell scrambling.In one embodiment, neighbor cell can calculate acquisition as follows for the relative field strength value of Xin Jia community:
E ( γ ) = E ( β 1 - α 1 α 1 + β 2 - α 2 α 2 + Λ + β N - α N α N ) ;
In formula: α 1, α 2, α 3Λ α nfor the field intensity value of Xin Jia community A after average value processing;
β 1, β 2, β 3Λ β nfor the field intensity value of neighbor cell B after average value processing, { 1,2,3 Λ N} are the sequence number of collection point.
In one embodiment, the distance of Xin Jia community and peripheral cell calculates acquisition as follows:
10lg(D AB-max(R A，R B)) a-10lg(max(R A，R B)) a＞PG；
In formula: α delegated path loss factor, in free space, value is 2, and in the middle of actual wireless environment, this value is relevant with the factors such as distribution, topography and geomorphology of Adjacent Buildings, generally 2 ~ 4.
PG is processing gain, and unit is dB, refer to base station signal nearby and at a distance neighbor base station signal incoming terminal receiver time signal strength difference minimum requirements.Wherein:
10lg (D ij-max (R i, R j)) α, represent the minimal path loss of Xin Jia community a-signal
10lg (max (R a, R b)), represent the greatest path loss of existing network community B signal
according to conservative situation, choose radius of society maximum in network, Ze Liang community distance should meet d aBfor the distance between Xin Jia community A and community B.
Each neighbor cell represents the interference effect degree of relative Xin Jia community, other community with the relative field strength value of Xin Jia community.Relative value is larger, and illustrate that this community is comparatively large to the interference of Xin Jia community, now, according to identical scrambler, terminal will be subject to stronger area interference.Relative value is less, illustrates that the interference of this community to Xin Jia community is less, adopts identical scrambler possibility larger, and the community impact that terminal is subject to is less.
Embodiment of the present invention can in the planning and designing stage, by first determining newly to add cell sites, to make rational planning for drive test circuit, gather the drive test data of this circuit, the drive test data of each community of statistical analysis, according to the lower principle of the larger scrambler priority of interference to newly adding cell allocation scrambler, guarantees that network engineering parameter is more reasonable, under avoiding traditional mode, dependence experience carries out scrambler distribution to Xin Jia community, thus the uncertainty brought.
In one embodiment, can by field intensity relative value from small to large to scrambler sequence, the cell scrambling priority that relative value is less is higher, and scrambler high for priority is distributed to Xin Jia community; If identical according to two native region priorities that relative field strength value obtains, need the access times judging peripheral cell scrambler in network, the minimum scrambler priority allocation of access times is to Xin Jia community.
As shown in Figure 2, in one embodiment, in above-mentioned steps S10, can determine newly to add cell sites according to peripheral cell radius and processing gain, specific as follows:
Step S11, according to the planning region of Xin Jia community, chooses first three community that covering radius in peripheral cell is maximum; In one embodiment, three community two neither co-sited, and community longitude or latitude difference.
Step S12, calculates the distance of Xin Jia community and peripheral cell.
For community A and B, A Shi Xinjia community, community, community B is existing network neighbor cell.R a, R bthe covering radius of community A and community B respectively, the distance of community A to community B is D aB, specifically can refer to shown in Fig. 3.
In existing network cell range, Xin Jia community A downstream signal reception power will much smaller than the signal power of existing network community B, and therefore, community A is to the distance D of community B aBlarge as far as possible, at least meet formula one below:
10lg (D aB-max (R a, R b)) a-10lg (max (R a, R b)) a> PG (formula one)
In formula, the calculating of path loss is simplified, only considered the trend that signal strength signal intensity weakens with propagation distance, do not consider the impact of shadow fading and rapid fading.
Each parameter meaning is as follows, α: path loss coefficient, and in free space, value is 2, and in the middle of actual wireless environment, this value is relevant with the factors such as distribution, topography and geomorphology of Adjacent Buildings, generally 2 ~ 4.
PG is processing gain, and unit is dB, refer to base station signal nearby and at a distance neighbor base station signal incoming terminal receiver time signal strength difference minimum requirements.Wherein:
10lg (D ij-max (R i, R j)) α: the minimal path loss representing distant cells a-signal
10lg (max (R a, R b)): the greatest path loss representing existing network community B signal
D ij > max ( R i , R j ) * ( 1 + 10 PG 10 α ) :
According to conservative situation, choose radius of society maximum in network, Ze Liang community distance should meet the requirement of following formula two.
D AB > R max * ( 1 + 10 PG 10 a ) (formula two)
Step S13, determines the position of Xin Jia community.
According to the longitude and latitude between two communities and distance, separate the position that three equations calculate Xin Jia community;
Assuming that the longitude and latitude of Xin Jia community A is X a, Y a, other three communities are neighbor cells of Jun Shixinjia community, B, C, D community A.The longitude and latitude of B community is X b, Y b, the distance of two communities is Z ab.Z abnamely the D calculated before being aB.So the longitude and latitude of Xin Jia community need meet the requirement of following formula three:
( X A - X B ) 2 + ( Y A - Y B ) 2 = Z AB 2 (formula three)
In like manner, community A and community C, the distance between community A and community D is also like this, as shown in formula four and five:
( X A - X C ) 2 + ( Y A - Y C ) 2 = Z AC 2 (formula four)
( X A - X D ) 2 + ( Y A - Y D ) 2 = Z AD 2 (formula five)
Solve X in equation a, Y anamely value is the site location of network Zhong Xinjia community.
The system that the present invention also provides a kind of dilatation cell scrambling to plan, it comprises:
Site analysis module, for determining the site of Xin Jia community; In one embodiment, site analysis module can be planned and the site of get Xin Jia community according to the covering radius of community and other factors.
Drive test planning module, for planning drive test circuit, determines community adjacent around Xin Jia community; In one embodiment, drive test planning module must be the edge of existing network neighbor cell and Xin Jia community for the planning of drive test circuit, guarantees that the pickup area of drive test data is all consistent for all neighbor cells.Because test data is the signal that will gather neighbor cell around, adopts unified principle to data analysis, just there is comparativity.Ruo Xinjia community and planning region, neighbor cell underlapped, then the website distance that the point of drive test circuit meets this Dian Daoliang community is greater than the zone line of respective radius of society respectively.There is overlapping planning region Ruo Xinjia community and neighbor cell, then the point of drive test circuit is selected in this overlapping region as far as possible.For all communities, all to ensure that the drive test data point collected is all signal strength values of all neighbor cells and Xin Jia cell edge region.
Data acquisition module, for gathering neighbor cell drive test data and being normalized; In one embodiment, data acquisition module specifically can be used for: do equalization process to signal strength BIN lattice belonging to certain community, obtains each BIN lattice are under the jurisdiction of the signal strength value of this community through equalization process; To the signal strength average that each BIN lattice point collects, do normalized.
Central processing module, for calculating the relative field strength value of neighbor cell for Xin Jia community, according to this value determination scrambler priority, and according to priority distributes and newly adds cell scrambling.Central processing module specifically can calculate by the computing formula in step S40 in preceding method flow process and obtain the relative field strength value of neighbor cell for Xin Jia community.
Embodiment of the present invention can in the planning and designing stage, first determine newly to add cell sites by site analysis module, and to be made rational planning for drive test circuit by drive test planning module, by the drive test data of this circuit of data collecting module collected, the drive test data of each community of statistical analysis, by central processing module according to the lower principle of the larger scrambler priority of interference to newly adding cell allocation scrambler, guarantee that network engineering parameter is more reasonable, under avoiding traditional mode, dependence experience carries out scrambler distribution to Xin Jia community, thus the uncertainty brought.
In one embodiment, site analysis module specifically for:
According to the planning region of Xin Jia community, choose first three community that covering radius in peripheral cell is maximum;
Calculate the distance of Xin Jia community and peripheral cell;
Determine the position of Xin Jia community.
Above-mentioned site analysis module can be determined newly to add cell sites according to the steps flow chart in embodiment illustrated in fig. 2 and computing formula, specifically see previous embodiment, can not be described further at this.
In one embodiment, drive test planning module can be specifically for:
The underlapped planning region in Ruo Xinjia community and neighbor cell, then the position of the signal acquisition point of drive test circuit is selected apart from being greater than respective radius of society respectively by the website of this Dian Daoliang community;
There is overlapping planning region Ruo Xinjia community and neighbor cell, then the signals collecting point selection of drive test circuit is in this overlapping region.
In one embodiment, said system also can comprise:
Judge module, for judging whether there is scrambler to be allocated in available scrambler set, if having, Random assignment scrambler is to Xin Jia community; If no, then Execution plan drive test circuit, determines community adjacent around Xin Jia community.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims (6)

1. a method for dilatation cell scrambling planning, is characterized in that, comprise the following steps:
Determine the site of Xin Jia community;
Planning drive test circuit, determines community adjacent around Xin Jia community;
Gather neighbor cell drive test data and be normalized;
Calculate the relative field strength value of neighbor cell for Xin Jia community, by field intensity relative value from small to large to scrambler sequence, the cell scrambling priority that relative value is less is higher, and scrambler high for priority is distributed to Xin Jia community;
Wherein, the site of the described Xin Jia of determination community comprises:
According to the planning region of Xin Jia community, choose first three community that covering radius in peripheral cell is maximum;
Calculate the distance of Xin Jia community and peripheral cell;
Determine the position of Xin Jia community;
Described planning drive test circuit, determines the community adjacent with Xin Jia community and comprises:
The underlapped planning region in Ruo Xinjia community and neighbor cell, then the position of the signal acquisition point of drive test circuit is selected apart from being greater than respective radius of society respectively by the website of this Dian Daoliang community;
There is overlapping planning region Ruo Xinjia community and neighbor cell, then the signals collecting point selection of drive test circuit is in this overlapping region.
2. the method for dilatation cell scrambling planning as claimed in claim 1, is characterized in that, described collection neighbor cell drive test data being normalized comprises:
Equalization process is done to signal strength BIN lattice belonging to certain community, obtains each BIN lattice are under the jurisdiction of the signal strength value of this community through equalization process;
To the signal strength average that each BIN lattice point collects, do normalized.
3. the method for dilatation cell scrambling planning as claimed in claim 1 or 2, is characterized in that, also comprises after the step of site performing the described Xin Jia of determination community:
Judge whether there is scrambler to be allocated in available scrambler set, if having, Random assignment scrambler is to Xin Jia community; If no, then Execution plan drive test circuit, determines community adjacent around Xin Jia community.
4. a system for dilatation cell scrambling planning, is characterized in that, comprising:
Site analysis module, for determining the site of Xin Jia community;
Drive test planning module, for planning drive test circuit, determines community adjacent around Xin Jia community;
Data acquisition module, for gathering neighbor cell drive test data and being normalized;
Central processing module, for calculating the relative field strength value of neighbor cell for Xin Jia community, by field intensity relative value from small to large to scrambler sequence, the cell scrambling priority that relative value is less is higher, and scrambler high for priority is distributed to Xin Jia community;
Wherein, described site analysis module specifically for:
According to the planning region of Xin Jia community, choose first three community that covering radius in peripheral cell is maximum;
Calculate the distance of Xin Jia community and peripheral cell;
Determine the position of Xin Jia community;
Described drive test planning module specifically for:
The underlapped planning region in Ruo Xinjia community and neighbor cell, then the position of the signal acquisition point of drive test circuit is selected apart from being greater than respective radius of society respectively by the website of this Dian Daoliang community;
There is overlapping planning region Ruo Xinjia community and neighbor cell, then the signals collecting point selection of drive test circuit is in this overlapping region.
5. system as claimed in claim 4, is characterized in that, described data acquisition module specifically for:
Equalization process is done to signal strength BIN lattice belonging to certain community, obtains each BIN lattice are under the jurisdiction of the signal strength value of this community through equalization process;
To the signal strength value that each BIN lattice point collects, do normalized.
6. the system as described in claim 4 or 5, is characterized in that, also comprises:
Judge module, for judging whether there is scrambler to be allocated in available scrambler set, if having, Random assignment scrambler is to Xin Jia community; If no, then Execution plan drive test circuit, determines community adjacent around Xin Jia community.
CN201110043412.XA 2011-02-23 2011-02-23 Expansion cell scrambling code planning method and system Active CN102651868B (en)

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