CN100375559C - Method of code resource allocation under multi-carrier cell - Google Patents
Method of code resource allocation under multi-carrier cell Download PDFInfo
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- CN100375559C CN100375559C CNB2004100093271A CN200410009327A CN100375559C CN 100375559 C CN100375559 C CN 100375559C CN B2004100093271 A CNB2004100093271 A CN B2004100093271A CN 200410009327 A CN200410009327 A CN 200410009327A CN 100375559 C CN100375559 C CN 100375559C
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Abstract
The present invention discloses a code resource distributing method for a multi-carrier wave area, which comprises that the present invention selects a main carrier frequency of adjacent areas; the present invention establishes a mathematical model, selects downstream synchronous codes of the adjacent areas according to the mathematic model, and sets a network building table; the present invention builds networks according to the network building table. The present invention lowers the disturbance between the areas when user terminals search, and causes users to correctly access the networks.
Description
Technical field
The present invention relates to the code-resource distribution method of the TDS-CDMA system of communication field, particularly relate to the code-resource distribution method under a kind of multi-carrier district.
Background technology
The same with other mobile communication system, in order to satisfy the ever-increasing demand in mobile communication market, carrying out in same sectors/cells that overloading covers frequently will be the important means that TD-SCDMA (TD SDMA) system increases power system capacity.
A cellular mobile communications networks that works in multiple radio frequency, if this network uses the 10MHz bandwidth, each base station is operated on 6 identical carrier frequencies.If a terminal is in the sub-district intersection, it will face following particular problem: the Cell searching difficulty.In order to solve the initial cell search problem of TDD (time division duplex) system under Cellular Networks, TD-SCDMA has designed unique frame structure, realizes Cell searching by downward guide time slot (DwPTS).Do not have business datum in this time slot, signal to noise ratio is very high.As UE during at cell boarder, because neighbor cell all will be at this frequency emission DwPTS, sign indicating number is different, and the base station separation is more or less the same again from the position of terminal, and terminal receives the signal to noise ratio of this steering signal may be at-5dB, even poorer, and adjacent carrier is all similar.Like this, will make very difficulty of initial ranging.Therefore, the zone for overloading covers frequently only sends pilot tone and broadcast message on a carrier frequency of cell/section, and a plurality of frequencies use a common broadcasting.
Therefore, how to solve the code word allocation problem of the multi-carrier frequency cell of TD-SCDMA communication system, how to effectively reduce the interference of minizone, the interference when especially reducing UE (user terminal) Cell searching can correctly insert UE, is that problem to be solved is arranged.
Summary of the invention
Technical problem to be solved by this invention provides the code-resource distribution method under a kind of multi-carrier district, and the user terminal initial ranging of the multi-carrier frequency cell of solution prior art is difficulty very, and user terminal is difficult to the correct problem that inserts.
For achieving the above object, the invention provides the code-resource distribution method under a kind of multi-carrier district, its characteristics are, comprise the steps: the main carrier frequency of step 1, selection neighbor cell; Step 2, set up a Mathematical Modeling, select the descending synchronous code of neighbor cell and set up a grid table according to described Mathematical Modeling; Step 3, carry out networking according to described grid table.
Code-resource distribution method under the above-mentioned multi-carrier district, its characteristics are, described step 1 further comprises: at each sub-district in the zone of multicarrier covering, if can from a plurality of frequencies in zone, determine the main carrier frequency of a frequency different, then select the main carrier frequency of the described frequency different for use as this sub-district with neighbor cell as this sub-district with neighbor cell.
Code-resource distribution method under the above-mentioned multi-carrier district, its characteristics are that described step 2 further comprises: step a, the correlation properties of 32 sign indicating numbers are sorted, be designated 32 natural numbers respectively, represent correlation between code word with these 32 natural numbers; Step b, set up the form of one 32 row, 8 row, the element of the 1st row is from 1 to 32, represent 32 set of code words sequence numbers, the 2nd row of every row to the 7th element that is listed as is the code word sequence number outside these row the 1st row, the 8th row are thresholdings of these row the 1st row and the 2nd to 7 row difference correlation, and make the code word that is filled into the 2nd to 7 row meet the requirement of described correlation less than described thresholding; Step c, insert data at random at described form, and judge whether described form satisfies following constraint: each code word sequence number of the 2nd to 7 row only occurs six times, and described code word sequence number can only occur once in every row; If described form does not satisfy described constraint, then return step b, if described form satisfies described constraint, then execution in step three.
Code-resource distribution method under the above-mentioned multi-carrier district, its characteristics are, further comprise in the described step 3: the 1st element that is listed as with described form is the center respectively, the element of the 2nd to 7 row that described the 1st each element of row is expert at is as the code word sequence number of six adjacent cells, code word with described adjacent cell is the center, in described form, search the adjacent cell of described adjacent cell respectively, successively set up grid, thereby set up the code word networking of sub-district.
Code-resource distribution method under the above-mentioned multi-carrier district, its characteristics are, in the described step 3, for the different neighbor cell of main carrier frequency, choose 7,9,12,13,16,19,21,32 code words of mating most and be made into adjacent district code word, and carry out multiplexing with these district code words.
Code-resource distribution method under the above-mentioned multi-carrier district, its characteristics are, in the described step 3, for the identical neighbor cell of main carrier frequency, choose 13,16,19,21,32 code words of mating most and be made into adjacent district code word, and carry out multiplexing with these district code words.
Code-resource distribution method under the above-mentioned multi-carrier district, its characteristics are that in the described step 2, for the different neighbor cell of main carrier frequency, described Mathematical Modeling is for selecting descending synchronous code arbitrarily at random.
Technique effect of the present invention is:
The present invention is in conjunction with TD-SCDMA communication system code word characteristics, frequently under the situation a kind of district code word distribution method is proposed in overloading, solved the code word allocation problem of multi-carrier frequency cell, effectively reduced the interference of minizone, interference when especially reducing the UE Cell searching, make correctly access network of UE, improved system reliability.
Description of drawings
Fig. 1 is the flow chart of steps of the inventive method.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Fig. 1 is the flow chart of steps of the inventive method;
The inventive method comprises the steps:
Step 100: the main carrier frequency of selecting neighbor cell.
At the zone that multicarrier covers, to each cell/section, from N the frequency that distributes, determine one as main carrier frequency, in same sector, only on main carrier frequency, send DwPTS.When selecting the main carrier frequency of neighbor cell,, therefore select different frequencies for use as far as possible, on frequency, carry out the separation of DwPTS, frequency isolation that Here it is because the interference of the code word between different carrier frequency is very little;
Step 200: set up a Mathematical Modeling, select the descending synchronous code of neighbor cell, comprising:
1) ... to 32 sign indicating numbers (C1, C2 ..., correlation properties C32) sort, and are designated 32 natural numbers respectively, and these 32 are worth the correlation of representing between two code words.
2) ... set up the form of a 32*8, promptly 32 row 8 are listed as, the 1st classifies from 1 to 32 as, represent 32 set of code words sequence numbers, the element of the 2nd row ~ the 7 row of every row is the code word sequence number except one's own profession the 1st row, the 8th row are thresholdings (the expression correlation is less than thresholding) of one's own profession the 1st row and 2 ~ 7 row difference correlations, and satisfactory code word just can be filled out 2 ~ 7 row of one's own profession.
3) ... insert data at random, satisfy following constraint: each code word sequence number of 2 ~ 7 row occurs and can only occur six times, and the code word sequence number can only occur once in every row.If the form of setting up does not satisfy this condition, then return step 2), rebulid form.
Step 300: by the form networking of second step foundation.
Element with form first row is the center, and the element of one's own profession the 2nd row ~ the 7 row is the center for contiguous six sub-districts with the adjacent cell, searches their adjacent cell in form respectively, successively sets up grid, has so just set up a district code word networking diagram.
As from the foregoing, the present invention determines one as main carrier frequency to each cell/section of multi-carrier district from N the frequency that distributes, in same sector, only send DwPTS on main carrier frequency.
Following table is exactly a step 2) the middle adjacent district code word configuration form of setting up, the 1st row six neighbor cell code words are on every side shown in ~ the 7 tabulation of the 2nd row in the table, the 8th row are thresholdings of one's own profession the 1st row and 2 ~ 7 row difference correlations, and correlation just can be inserted 2 ~ 7 row of one's own profession less than the code word of this thresholding.
| 1 | C 1，1 | C 1，2 | C 1，3 | C 1，4 | C 1，5 | C 1，6 | T |
| 2 | C 2，1 | C 2，2 | C 2，3 | C 2，4 | C 2，5 | C 2，6 | T |
| 3 | C 3，1 | C 3，2 | C 3，3 | C 3，4 | C 3，5 | C 3，6 | T |
| 4 | C 4，1 | C 4，2 | C 4，3 | C 4，4 | C 4，5 | C 4，6 | T |
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| 32 | | | | | | | |
Table element m in the following table
I, iIt is neighbor cell code word configuration correlation, ~ the 7 tabulation of the 2nd row is shown the 1st row and is gone up the correlation of the corresponding code word in this position in the table, the 8th row are thresholdings of one's own profession the 1st row and 2 ~ 7 row difference correlations, and correlation just can be inserted 2 ~ 7 row of one's own profession less than the code word correlation of this thresholding.
| 1 | m 1，1 | m 1，2 | m 1，3 | m 1，4 | m 1，5 | m 1，6 | T |
| 2 | m 2，1 | m 2，2 | m 2，3 | m 2，4 | m 2，5 | m 2，6 | T |
| 3 | m 3，1 | m 3，2 | m 3，3 | m 3，4 | m 3，5 | m 3，6 | T |
| 4 | m 4，1 | m 4，2 | m 4，3 | m 4，4 | m 4，5 | m 4，6 | T |
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| 32 | | | | | | | |
Adopt complete different frequent points to send DwPTS for the sub-district, the district code word networking can adopt following two sets of plan to implement:
Scheme one:
7,9,12,13,16,19,21,32 code words choosing best performance are made into adjacent sub-district; Carry out multiplexing with these district code words.
Scheme two:
Utilize the isolation of frequency, the code word random arrangement.Scheme two collocation methods are simple, but performance does not have scheme one good.
The frequency that sends DwPTS for adjacent sub-district has difference, has when identical, adopts following scheme: because the different frequency code word has isolation, a little less than the code word correlation required, and must adopt the said method in front, the search code word with code word frequently.It is multiplexing to carry out district code word with the configuration relation of such frequency and code word correspondence then.
Adopt identical frequency to send DwPTS for the sub-district, adopt following scheme: 13,16,19,21,32 code words choosing best performance are made into adjacent sub-district; Carry out multiplexing with these district code words.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.
Claims (7)
1. the code-resource distribution method under the multi-carrier district is characterized in that, comprises the steps:
The main carrier frequency of step 1, selection neighbor cell;
Step 2, set up a Mathematical Modeling, promptly the correlation properties to 32 sign indicating numbers sort, and set up and fill a grid table that meets 32 row, 8 row of corresponding constraint according to this correlation results; Select the descending synchronous code of neighbor cell according to described Mathematical Modeling;
Identical or the different characteristic of step 3, the dominant frequency point that adopts according to neighbor cell in the network adopts a corresponding yard resource allocation proposal that described grid table is carried out networking.
2. the code-resource distribution method under the multi-carrier district according to claim 1, it is characterized in that, described step 1 comprises again: at each sub-district in the zone of multicarrier covering, if can from a plurality of frequencies in zone, determine the main carrier frequency of a frequency different, then select the main carrier frequency of the described frequency different for use as this sub-district with neighbor cell as this sub-district with neighbor cell.
3. the code-resource distribution method under the multi-carrier district according to claim 1 and 2 is characterized in that, described step 2 comprises again:
Step a, the correlation properties of 32 sign indicating numbers are sorted, be designated 32 natural numbers respectively, represent correlation between code word with these 32 natural numbers;
Step b, set up the form of one 32 row, 8 row, the element of the 1st row is from 1 to 32, represent 32 set of code words sequence numbers, the 2nd row of every row to the 7th element that is listed as is the code word sequence number outside these row the 1st row, the 8th row are thresholdings of these row the 1st row and the 2nd to 7 row difference correlation, and make the code word that is filled into the 2nd to 7 row meet the requirement of described correlation less than described thresholding;
Step c, insert data at random at described form, and judge whether described form satisfies following constraint: each code word sequence number of the 2nd to 7 row only occurs six times, and described code word sequence number can only occur once in every row; If described form does not satisfy described constraint, then return step b, if described form satisfies described constraint, then execution in step three.
4. the code-resource distribution method under the multi-carrier district according to claim 3, it is characterized in that, comprise again in the described step 3: the 1st element that is listed as with described form is the center respectively, the element of the 2nd to 7 row that described the 1st each element of row is expert at is as the code word sequence number of six adjacent cells, code word with described adjacent cell is the center, in described form, search the adjacent cell of described adjacent cell respectively, successively set up grid, thereby set up the code word networking of sub-district.
5. the code-resource distribution method under the multi-carrier district according to claim 4, it is characterized in that, in the described step 3, for the different neighbor cell of main carrier frequency, choose 7,9,12,13,16,19,21,32 best code words and be made into adjacent district code word, and carry out multiplexing with these district code words.
6. the code-resource distribution method under the multi-carrier district according to claim 4, it is characterized in that, in the described step 3, for the identical neighbor cell of main carrier frequency, choose 13,16,19,21,32 best code words and be made into adjacent district code word, and carry out multiplexing with these district code words.
7. the code-resource distribution method under the multi-carrier district according to claim 2 is characterized in that, in the described step 2, for the different neighbor cell of main carrier frequency, described Mathematical Modeling is for selecting descending synchronous code arbitrarily at random.
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| CNB2004100093271A CN100375559C (en) | 2004-07-13 | 2004-07-13 | Method of code resource allocation under multi-carrier cell |
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| CNB2004100093271A CN100375559C (en) | 2004-07-13 | 2004-07-13 | Method of code resource allocation under multi-carrier cell |
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| CN100375559C true CN100375559C (en) | 2008-03-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103581915A (en) * | 2012-07-27 | 2014-02-12 | 中国移动通信集团设计院有限公司 | Method and equipment for planning PCI in LTE network |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101170784B (en) * | 2006-10-25 | 2010-12-08 | 中兴通讯股份有限公司 | Resource configuration detection method |
| CN101287267B (en) * | 2007-04-10 | 2012-05-23 | 中兴通讯股份有限公司 | Code word cell allocation method |
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| CN1295392A (en) * | 1999-10-11 | 2001-05-16 | 阿尔卡塔尔公司 | Resource allocation in CDMA small erea |
| CN1307415A (en) * | 2000-01-11 | 2001-08-08 | 三星电子株式会社 | Device for searching mesh and method for obtaining per-mesh uniquely code |
| CN1308824A (en) * | 1998-05-15 | 2001-08-15 | 艾利森电话股份有限公司 | Coded allocation for sectorised radiocommunication systems |
| US20020003782A1 (en) * | 2000-07-10 | 2002-01-10 | Interdigital Technology Corporation | Code power measurement for dynamic channel allocation |
| CN1488198A (en) * | 2000-12-15 | 2004-04-07 | �����ɷ� | Method and apparatus for code assignment in a spread spectrum wireless communication system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308824A (en) * | 1998-05-15 | 2001-08-15 | 艾利森电话股份有限公司 | Coded allocation for sectorised radiocommunication systems |
| CN1295392A (en) * | 1999-10-11 | 2001-05-16 | 阿尔卡塔尔公司 | Resource allocation in CDMA small erea |
| CN1307415A (en) * | 2000-01-11 | 2001-08-08 | 三星电子株式会社 | Device for searching mesh and method for obtaining per-mesh uniquely code |
| US20020003782A1 (en) * | 2000-07-10 | 2002-01-10 | Interdigital Technology Corporation | Code power measurement for dynamic channel allocation |
| CN1488198A (en) * | 2000-12-15 | 2004-04-07 | �����ɷ� | Method and apparatus for code assignment in a spread spectrum wireless communication system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103581915A (en) * | 2012-07-27 | 2014-02-12 | 中国移动通信集团设计院有限公司 | Method and equipment for planning PCI in LTE network |
| CN103581915B (en) * | 2012-07-27 | 2016-12-21 | 中国移动通信集团设计院有限公司 | A kind of method and apparatus planning PCI in LTE network |
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