CN1870484B - Compound generating method for distinguishing different code channel in cellular mobile communication system - Google Patents
Compound generating method for distinguishing different code channel in cellular mobile communication system Download PDFInfo
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- CN1870484B CN1870484B CN2005100719699A CN200510071969A CN1870484B CN 1870484 B CN1870484 B CN 1870484B CN 2005100719699 A CN2005100719699 A CN 2005100719699A CN 200510071969 A CN200510071969 A CN 200510071969A CN 1870484 B CN1870484 B CN 1870484B
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Abstract
This invention relates to a method for generating compound codes used in differentiating different code channels in a cell mobile communication system including: 1, deciding number N of a first kind of codes, which are the codes identifying different areas in the largest area multiplex cluster, 2, deciding the number M of a second kind of codes corresponding to each first kind of codes in the cluster composed of the first kind of codes, 3, determining numbers of different spectrum spreading factors usable in each area, 4, generating N x N x Q compound codes according to the principle of small relativity value to set up a corresponding relation between each Q compound code and a second code.
Description
Technical field
The present invention relates to the communications field, relate in particular to the compound code generating method and the code word planing method thereof that are used to distinguish different code channels in the cell mobile communication systems.
Background technology
The 3rd third-generation mobile communication system has extensively adopted the access mode based on CDMA, and its essential characteristic is exactly to distinguish different users with different code words.In order to realize the beehive net structure, different cdma systems has all defined different separately code words and has used and allocative decision.
Wherein, the employed sign indicating number of TD-SCDMA system can be divided into by type: downlink frequency pilot code, ascending pilot frequency sign indicating number, cell scrambling, training sequence (training sequence code) and channel code.The corresponding relation of downlink frequency pilot code, ascending pilot frequency sign indicating number, scrambler and basic training sequences intersymbol is referring to table 1.
Table 1
As shown in table 1, downlink frequency pilot code one has 32, and ascending pilot frequency sign indicating number one has 256.The ascending pilot frequency sign indicating number is used in random access procedure by subscriber equipment (UE), and the employed downlink frequency pilot code of the ascending pilot frequency sign indicating number of each sub-district and sub-district has certain corresponding relation, corresponding 8 the ascending pilot frequency sign indicating numbers of downlink frequency pilot code.The quantity of scrambler and basic training sequences sign indicating number all is 128, each sub-district is after downlink frequency pilot code is determined, can from 4 scramblers of each downlink frequency pilot code correspondence, select a scrambler as this sub-district, simultaneously so also just determined corresponding basic training sequences sign indicating number, the training sequence code of different channels is to be generated according to certain skew by the basic training sequences sign indicating number in the sub-district.Spreading code is used to distinguish physical channels different in the same sub-district, and training sequence code is used for each channel and carries out channel estimating.
Usually the distribution method of district code word is to be cell allocation downlink frequency pilot code (SYNC-DL) earlier, determines ascending pilot frequency sign indicating number, scrambler and basic training sequences sign indicating number according to the relation between various code words shown in the table 1 then.Specifically, distribution to downlink frequency pilot code (SYNC-DL) can be according to certain multiplex mode, as 7 sub-districts is that a multiplexing cluster or 19 sub-districts are that multiplex mode of a multiplexing cluster etc. carries out code assignment, then bunch expands according to such cell reuse in whole planning region.For example, when being one bunch for 19 sub-districts, press the sequence number of descending pilot code earlier, order is given 1-19 cell allocation downlink frequency pilot code respectively, after the downlink frequency pilot code of having determined the sub-district, just can determine the ID (ascending pilot frequency sign indicating number, scrambler and basic training sequences sign indicating number) of all the other type codes according to the relation between various code words shown in the table 1.More than at be code assignment with regular desirable cellular cell topological structure, in the network planning of reality, generally be to guarantee that the downlink frequency pilot code for each cell allocation is unique in the cell cluster of this sub-district and all neighbor cells composition, this principle has been that one of ordinary skill in the art is in common knowledge.
Traffic Channel in the sub-district is distinguished by compound key.For Traffic Channel, adopt the channel code of spread spectrum coefficient SF=1-16 to carry out spread spectrum usually, again the scrambler scrambling of adopting with this sub-district.Because the scrambler of each sub-district is fixed, mainly be therefore to the traffic channel assignments channel code.Again because channel code is that ovsf code (orthogonalization sign indicating number) and channel code and scrambler are all shorter, therefore the compound key that obtains after the scrambler step-by-step of channel code and sub-district is multiplied each other has relatively poor autocorrelation and cross correlation, make thus in the identical networking process, there is strong interference between the user easily, even can causes the user to communicate by letter normally.From another aspect, work in neighbor cell if having two compound code words of strong correlation, if the subscriber signal strength ratio of the different districts of arrival receiver is more approaching, then these two users' signal will be difficult to be distinguished, will cause relevant code track not work like this, thereby cause the loss of capacity.
The applicant also did a lot of researchs for this reason, such as, be to disclose a kind of method of in combined detection system, using long subzone code (scrambler) in 02148622.0 at application number.Disclose a kind of signal that utilizes long subzone code to distinguish different districts in the present invention, keeping maximum spread spectrum coefficient is 16, and maximum user's number of supporting also is 16 constant, but the neighbor cell long subzone code, as 32,64,128 etc. (16 multiples).Though this method has reduced the interference between the sub-district, reduced the interference between the user thus, the amount of calculation when this method causes receiving terminal to carry out joint-detection is very big, has obviously improved the complexity of the joint-detection of receiving terminal.
Summary of the invention
The object of the present invention is to provide the compound code generating method that is used to distinguish different code channels in a kind of cell mobile communication systems, to solve in the prior art owing to have relatively poor cross correlation between the compound key, and cause between the user and to generate stronger interference easily, and then influence the technical problem of user's communications quality, and, though neighbor cell adopts long subzone code so that reduce the interference of user in the neighbor cell, but brings receiving terminal to carry out the technical problem of the complexity of joint-detection.
The code distribution method that provides a kind of allocative efficiency high is provided.
Be used to distinguish the compound code generating method of different code channels in a kind of cell mobile communication systems, it is characterized in that, this method comprises: (1) determines the number N of first kind of sign indicating number, described first kind of sign indicating number that sign indicating number is unique identification different districts in the largest cell multiplexing cluster; (2) the number M of each first kind of corresponding second kind of sign indicating number of sign indicating number of concentrating of the sign indicating number of determining to form with first kind of sign indicating number; (3) determine the number of the different spread spectrum coefficients that each sub-district can be used; (4) carry out at each spread spectrum coefficient Q: generate N * M * Q compound key according to the principle that correlation is little between each code word, described correlation be meant for a short time between each code word cross correlation value smaller or equal to default first threshold value or, described correlation be meant for a short time cross correlation value between each code word smaller or equal to the autocorrelation sequence secondary lobe of default first threshold value and each code word smaller or equal to second predetermined threshold value; N * M * Q compound key is carried out label in order, each label is in order to unique identification one compound key, according to label N * M * Q compound key is divided into N * M group, the corresponding second kind of sign indicating number of each group is to set up the corresponding relation between every Q compound key and second kind of sign indicating number.
The preferred value of number N described in the step (1) is 32 or 128.When the number N value described in the step (1) was 32, the preferred value of the number M described in the step (2) was 4; When the number N value described in the step (1) was 128, the preferred value of the number M described in the step (2) was 1.
In the above-mentioned disclosed scheme, first kind of sign indicating number is downlink frequency pilot code, and described second kind of sign indicating number is the basic training sequences sign indicating number.
The invention also discloses a kind of code word planing method, comprising: (1) sets up the code word relation between compound key, basic training sequences sign indicating number and the downlink frequency pilot code in advance; (11) determine the number N of downlink frequency pilot code, described downlink frequency pilot code is the sign indicating number of unique identification different districts in the largest cell multiplexing cluster; (12) the number M of the corresponding basic training sequences sign indicating number of each downlink frequency pilot code concentrated of the sign indicating number of determining to form with downlink frequency pilot code; (13) determine the number of the different spread spectrum coefficients that each sub-district can be used; (14) carry out at each spread spectrum coefficient Q: the principle little according to correlation generates N * M * Q compound key, described correlation be meant for a short time between each code word cross correlation value smaller or equal to default first threshold value or, described correlation be meant for a short time cross correlation value between each code word smaller or equal to the autocorrelation sequence secondary lobe of default first threshold value and each code word smaller or equal to second predetermined threshold value; N * M * Q compound key is carried out label in order, each label is in order to unique identification one compound key, according to label N * M * Q compound key is divided into N * M group, the corresponding second kind of sign indicating number of each group is to set up the corresponding relation between every Q compound key and the basic training sequences sign indicating number; (2) be downlink frequency pilot code of each cell allocation according to the real cell topological structure; (3) determine basic training sequences sign indicating number and the compound key corresponding according to the relation between the various code words of step (1) foundation with downlink frequency pilot code.
One or more in all basic training sequences sign indicating numbers that determined basic training sequences sign indicating number can be the downlink frequency pilot code correspondence in step (1).Downlink frequency pilot code for each cell allocation in step (2) is unique in the cell cluster of this sub-district and all neighbor cells composition.
The invention discloses the compound code generating method that is used to distinguish different code channels in the another kind of cell mobile communication systems, comprising: (1) determines the number N of first kind of sign indicating number, described first kind of sign indicating number that sign indicating number is unique identification different districts in the largest cell multiplexing cluster; (2) the number M of each first kind of corresponding second kind of sign indicating number of sign indicating number of concentrating of the sign indicating number of determining to form with first kind of sign indicating number; (3) determine the number K of the different spread spectrum coefficients that each sub-district can be used; (4) according to L
i=N * M * Q
iCalculate each spread spectrum coefficient Q
iThe compound key number L that needs generation
i, and according to
Calculate total compound key number L that the largest cell multiplexing cluster is used
Always, i=1～K; (5) generate L according to the principle that correlation is little between each code word
AlwaysIndividual compound key, described correlation is meant that for a short time cross correlation value between each code word is smaller or equal to default first threshold value, perhaps be meant cross correlation value between each code word smaller or equal to the autocorrelation sequence side lobe levels of default first threshold value and each code word smaller or equal to default second threshold value, and with described L
AlwaysIndividual compound key is according to each spread spectrum coefficient Q
iThe compound key number L that needs generation
iDistribute to each spread spectrum coefficient respectively, and with N * M * Q
iIndividual compound key carries out label in order, and each label connects according to label N * M * Q in order to unique identification one compound key
iIndividual compound key is divided into N * M group, and corresponding one second yard of each group is to set up every Q
iCorresponding relation between individual compound key and second kind of sign indicating number.
The preferred value of number N described in the step (1) is 32 or 128.When the number N value described in the step (1) was 32, the preferred value of the number M described in the step (2) was 4; When the number N value described in the step (1) was 128, the preferred value of the number M described in the step (2) was 1.
First kind of sign indicating number is downlink frequency pilot code in the such scheme, and described second kind of sign indicating number is the basic training sequences sign indicating number.
The invention discloses second kind of code word planing method, comprising: (1) sets up the code word relation between compound key, basic training sequences sign indicating number and the downlink frequency pilot code in advance; (11) number N of true downlink frequency pilot code, described downlink frequency pilot code is the sign indicating number of unique identification different districts in the largest cell multiplexing cluster; (12) determine the number M of the corresponding basic training sequences sign indicating number of each downlink frequency pilot code concentrated with downlink frequency pilot code; (13) determine the number K of the different spread spectrum coefficients that each sub-district can be used; (14) according to L
i=N * M * Q
iCalculate each spread spectrum coefficient Q
iThe compound key number L that needs generation
i, and according to
Calculate total compound key number L that the largest cell multiplexing cluster is used
Always, i=1～K; (15) generate L according to the principle that correlation is little between each code word
AlwaysIndividual compound key, described correlation is meant that for a short time cross correlation value between each code word is smaller or equal to default first threshold value, perhaps be meant cross correlation value between each code word smaller or equal to the autocorrelation sequence side lobe levels of default first threshold value and each code word smaller or equal to default second threshold value, and with described L
AlwaysIndividual compound key is according to each spread spectrum coefficient Q
iThe compound key number L that needs generation
iDistribute to each spread spectrum coefficient respectively, and with N * M * Q
iIndividual compound key carries out label in order, and each label connects according to label N * M * Q in order to unique identification one compound key
iIndividual compound key is divided into N * M group, and corresponding one second yard of each group is to set up every Q
iCorresponding relation between individual compound key and the basic training sequences sign indicating number; (2) be downlink frequency pilot code of each cell allocation according to real topology; (3) determine basic training sequences sign indicating number and the compound key corresponding according to the relation between the various code words of step (1) foundation with downlink frequency pilot code.
Downlink frequency pilot code for each cell allocation in step (2) is unique in the cell cluster of this sub-district and all neighbor cells composition.One or more in all basic training sequences sign indicating numbers that determined basic training sequences sign indicating number can be the downlink frequency pilot code correspondence in step (1).
Compared with prior art, the present invention has the following advantages:
When plot planning, directly for each sub-district generates a plurality of compound keys, in order to replacing scrambler and the channel code in the existing standard, and the compound code character of same sub-district and basic training sequences sign indicating number still have corresponding relation according to the little principle of the interference of code word.When the sub-district is user's distribution service channel, can directly from compound code character, select a wherein compound key according to the spread spectrum coefficient that adopts, it is dispensed to this Traffic Channel.Owing to considered the interference between the code word when before the plot planning process, generating the compound code character be used to distinguish each sub-district, therefore the plot planning process is also fairly simple, when user's distribution service channel is given in the sub-district in cellular system work, cross correlation value between the compound key that need not to consider compound key and distributed other Traffic Channel, improve the efficient of traffic channel assignments thus, also can suppress common-channel interference well simultaneously.
According to compound code generating method of the present invention, the corresponding relation between original channel code and the training sequence displacement window is changed into the corresponding relation between existing compound key and the training sequence displacement window.Receiving terminal detects after the channel estimation window, just can obtain the compound key of this channel estimation window correspondence according to this corresponding relation, thereby utilizes these code channels to go to carry out Multiuser Detection.That is, for this compound key distribution method of the present invention, the testing process and the detection algorithm of receiving terminal do not change, and then do not increase the complexity that detects.
Description of drawings
Fig. 1 is the compound key product process figure that is used to distinguish different code channels in a kind of cell mobile communication systems of the present invention;
Fig. 2 is the flow chart of a kind of code word planing method of the present invention;
Fig. 3 is the compound key product process figure that is used to distinguish different code channels in the another kind of cell mobile communication systems of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
Core of the present invention is: when plot planning, the principle little according to the interference of code word directly generates a plurality of compound keys for each sub-district, in order to replacing scrambler and the channel code in the existing standard, and the compound code character of same sub-district and basic training sequences sign indicating number still have corresponding relation.When the sub-district is user's distribution service channel, can directly from compound code character, select a wherein compound key according to the spread spectrum coefficient that adopts, it is dispensed to this Traffic Channel.Owing to considered the interference between the code word when before plot planning, generating the compound code character be used to distinguish each sub-district, therefore the plot planning process is also fairly simple, when user's distribution service channel is given in the sub-district in cellular system work, cross correlation value between the compound key that need not to consider compound key and distributed other Traffic Channel, improve the efficient of traffic channel assignments thus, also can suppress common-channel interference well simultaneously.When being the compound key of selecting by following condition: the cross correlation value between each code word is less than first threshold value, and the technical staff can be provided with threshold value according to concrete actual networking, and it is more little that threshold value is set, and the effect that suppresses common-channel interference is good more.
See also Fig. 1, it is for the flow chart of a kind of compound key distribution method of the present invention.This method comprises:
S110: determine the number N of first kind of sign indicating number, described first kind of sign indicating number that sign indicating number is unique identification different districts in the largest cell multiplexing cluster;
S120: the number M of each first kind of corresponding second kind of sign indicating number of sign indicating number that definite sign indicating number of forming with first kind of sign indicating number is concentrated;
S130: the number of determining the different spread spectrum coefficients that each sub-district can be used;
S140: carry out: generate N * M * Q compound key according to the little principle of correlation, set up the corresponding relation between every Q compound key and second kind of sign indicating number at each spread spectrum coefficient Q.
First kind of sign indicating number can be downlink frequency pilot code, and second kind of sign indicating number can be the basic training sequences sign indicating number.Below the specific implementation of above step is described in detail respectively:
One, step S110 specific implementation
Cell reuse bunch is meant that system distributes code word according to certain multiplex mode, such as usually adopting 7 sub-districts in the prior art is that cell reuse bunch or 19 sub-districts are that the multiplex mode of a cell reuse bunch carries out code assignment, then bunch expands according to such cell reuse in whole planning region.Usually with the number of enough big cell reuse bunch as considering.The sub-district number of multiplexing cluster also can keep existing standard cell group mode constant when the sub-district number N can be for system group network among the step S110.The preferred value of number N is 32 or 128.
Two, the specific implementation of step S120
The set that first kind of all sign indicating numbers formed is referred to as the sign indicating number collection of first kind of sign indicating number.Set up the corresponding relation of M second kind of sign indicating number and each first kind of sign indicating number.When second kind of sign indicating number is the basic training sequences sign indicating number, set up the corresponding relation of an every M basic training sequences sign indicating number and a descending pilot code.When the N value was 32 among the step S110, the preferred value of number M was 4 among the step S120, and when the number N value was 128 among the step S110, the preferred value of the number M among the step S120 was 1.
The specific implementation of three step S130
In TD-SCDMA, the information rate of Traffic Channel is relevant with character rate, character rate by 1.28Mc/s spreading rate and spread spectrum coefficient determined, the spread spectrum coefficient of up-downgoing channel is between 1-16.In fact, the spread spectrum coefficient of each sub-district can get 1,2,4,8,16, promptly the sub-district can with spread spectrum coefficient be 1,2,4,8,16 these five coefficients.
Two, step S140 specific implementation
All need to generate the little N * M of correlation * Q compound key for each spread spectrum coefficient, and set up the corresponding relation between every Q compound key and second kind of sign indicating number (is example with the basic training sequences sign indicating number),
Described correlation typically refers to cross correlation value between each code word for a short time smaller or equal to default first threshold value.Described correlation is little also can refer to the autocorrelation sequence side lobe levels between the code word smaller or equal to the cross correlation value between default first threshold value and each code word smaller or equal to default second threshold value.
Because compound key is 16 long binary sequences, so compound key is to select N * M * Q sign indicating number from following maximum code collection (SF=16).
Table 2 maximum code collection
When correlation is meant that for a short time cross correlation value between each code word is smaller or equal to default first threshold value.Then obtain N * M * Q compound key: concentrate the sign indicating number of selecting N * M * Q to satisfy cross correlation value from the maximum code of table 2 smaller or equal to default first threshold value according to following criterion.
If correlation be meant for a short time autocorrelation sequence side lobe levels between the code word smaller or equal to the cross correlation value between default second threshold value and each code word smaller or equal to default first threshold value.Then can following criterion obtain N * M * Q compound key: earlier each yard in the table 2 all carried out the computing of autocorrelation sequence side lobe levels, obtain the autocorrelation sequence side lobe levels of this yard, judge that then whether this autocorrelation sequence side lobe levels is smaller or equal to predefined second threshold value, if, pile up into first yard collection described, at last, concentrate the sign indicating number of selecting N * M * Q to satisfy cross correlation value with first yard smaller or equal to predefined first threshold value.
For each spread spectrum coefficient Q, at first, with N * M * Q compound key carry out in order label (be sequence number from 1 to N * M * Q), and each sequence number is in order to unique identification one compound key; Connect according to label N * M * Q compound key is divided into the N group, the corresponding basic training sequences sign indicating number of each group.Set up relation between basic training sequences sign indicating number and the compound key with this.
See also table 3, when it is SF=16, the corresponding relation between basic training sequences sign indicating number and the compound key.
Table 3
See also table 4, when it is SF=8, the corresponding relation between basic training sequences sign indicating number and the compound key.
Table 4
See also table 5, when it is SF=4, the corresponding relation between basic training sequences sign indicating number and the compound key.
Table 5
See also table 6, when it is SF=2, the corresponding relation between basic training sequences sign indicating number and the compound key
Table 6
See also table 7, when it is SF=1, the corresponding relation between basic training sequences sign indicating number and the compound key
Table 7
As can be known: under the situation of SF=16, generate 128*16=2048 compound key; Under the situation of SF=8, need to generate 128*8=1024 compound key; Under the situation of SF=4, need to generate 128*4=512 compound key; Under the situation of SF=2, generate 128*2=256 compound key; Under the situation of SF=1, generate 128*1=128 compound key.That is: the maximum compound key number that need to generate is: 2048+1024+512+256+128=3968 accounts for the sum (2 of 16 long binary sequences
16-1=32768) 12%, and this ratio can guarantee that cross-correlation between the gained code word less than 16, is better than the performance of existing standard code word.
Yet, realize in the networking process in system, be that code assignment is considered in the unit seldom with 128 sub-districts.Therefore, the present invention can distribute compound key according to the sub-district number of cell reuse bunch fully.Yet, in system's actual sets network process, the number of cells of the identical networking that needs is generally 7 or be 19 to the maximum, and this just means us, and in fact only needs generation 7* (16+8+4+2+1)=217 or 19* (16+8+4+2+1)=589 compound key are just passable.And from ading up to 2
16-1It is fully possible that=32768 big sign indicating number is concentrated the little sign indicating number collection that generates 217 or 589 code words compositions that need, and, by threshold value being provided with more exacting terms (further reducing the value of thresholding), can guarantee that the code word that little sign indicating number is concentrated has than the better cross-correlation of the code word of existing standard.That is to say that first threshold value and second threshold value are to set according to the product of N and M, the product of N and M is more little, and first threshold value and second threshold value of setting are also more little.
Based on above-mentioned disclosed compound code generating method, the invention provides a kind of code word planing method of correspondence.See also Fig. 2, it is for the flow chart of a kind of code word planing method of the present invention.This method may further comprise the steps:
S210: set up the code word relation between compound key, basic training sequences sign indicating number and the downlink frequency pilot code in advance;
(11) determine the number N of downlink frequency pilot code, described downlink frequency pilot code is the sign indicating number of unique identification different districts in the largest cell multiplexing cluster;
(12) the number M of the corresponding basic training sequences sign indicating number of each downlink frequency pilot code concentrated of the sign indicating number of determining to form with downlink frequency pilot code;
(13) determine the number of the different spread spectrum coefficients that each sub-district can be used;
(14) carry out at each spread spectrum coefficient Q: generate N * M * Q compound key according to the little principle of correlation, set up the corresponding relation between every Q compound key and the basic training sequences sign indicating number;
S220: according to the real cell topological structure is downlink frequency pilot code of each cell allocation;
S230: determine basic training sequences sign indicating number and the compound key corresponding with downlink frequency pilot code according to the relation between the various code words of step S210 foundation.
One or more in all basic training sequences sign indicating numbers that determined basic training sequences sign indicating number can be the downlink frequency pilot code correspondence in step S210.Downlink frequency pilot code for each cell allocation in step S220 is unique in the cell cluster of this sub-district and all neighbor cells composition.Code word relation among the step S210 between basic training sequences sign indicating number, downlink frequency pilot code and the ascending pilot frequency sign indicating number identical with the code word relation in the existing standard (shown in table 3-table 7).
Because the planing method of this district code word has been given each cell allocation its employed compound key, when therefore giving user's distribution service channel, need not to consider to be newly assigned to the compound key of Traffic Channel and the correlation between the compound key between the distributing user, improved the efficient that sign indicating number distributes thus.
In addition, prior art is distinguished different code channels with channel code, distinguishes different code channels with compound key in the present invention, and each compound key replaces the corresponding relation between existing channel code foundation and the training sequence displacement window.In cdma communication system of the present invention, there are three kinds of code channel distribution methods: special (specific) mode of distribution, default allocation (default) mode, shared distribution (common) mode of assigning in the same old way.Wherein, the specific mode is notified corresponding relation between compound key and the channel estimation window by high level, and a plurality of compound keys that belong to same user take same channel estimation window, and this window position is specified arbitrarily.Default mode and common mode define corresponding relation between compound key and the channel estimation window according to the criterion of acquiescence.And the detection algorithm of receiving terminal does not change.Just in the Multiuser Detection process, obtain to have the compound key of corresponding relation, and obtain the activated code channel of correspondence by compound key by the channel estimation window that activates.
See also Fig. 3, it is the flow chart of the compound code generating method that is used to distinguish different code channels in the another kind of cell mobile communication systems disclosed by the invention.It comprises:
S310: determine the number N of first kind of sign indicating number, described first kind of sign indicating number that sign indicating number is unique identification different districts in the largest cell multiplexing cluster;
S320: the number M of each first kind of corresponding second kind of sign indicating number of sign indicating number that definite sign indicating number of forming with first kind of sign indicating number is concentrated;
S330: the number K of determining the different spread spectrum coefficients that each sub-district can be used;
S340: according to L
i=N * M * Q
iCalculate each spread spectrum coefficient Q
iThe compound key number L that needs generation
i, and according to
Calculate total compound key number L that the largest cell multiplexing cluster is used
Always, i=1～K;
S350: the principle little according to correlation generates L
AlwaysIndividual compound key, and with described L
AlwaysIndividual compound key is according to each spread spectrum coefficient Q
iThe compound key number L that needs generation
iDistribute to each spread spectrum coefficient respectively, and set up every Q
iCorresponding relation between individual compound key and second kind of sign indicating number.
Because step S110-S130 and step S310-S330's is basic identical, just omit at this.Highlight step S340.
Two, the specific implementation of S340
According to L
i=N * M * Q
iCalculate each spread spectrum coefficient Q
iThe compound key number L that needs generation
i, and according to
Calculate total compound key number L of described cell reuse bunch use
Always, i=1～K.
Existing TD-SCDMA communication system, K is generally 5, i.e. Q
1=16, Q
2=8, Q
3=4, Q
4=2, Q
5=1.The L that generates
Always=16*N+8*N+4*N+2*N+N=31*N.
The principle little according to correlation generates L
AlwaysIndividual compound key specifically comprises: concentrate from maximum code and select L
AlwaysThe individual sign indicating number that satisfies cross correlation value smaller or equal to the predefined first threshold value condition.
Because concrete assigning process and step S350 sets forth in detail in abovementioned steps S120 has just repeated no more at this.
Based on above-mentioned disclosed compound code generating method, the present invention also provides a kind of code word planing method.
Specifically comprise:
A: set up the code word relation between compound key, basic training sequences sign indicating number and the downlink frequency pilot code in advance;
A1: the number N of true downlink frequency pilot code, described downlink frequency pilot code is the sign indicating number of unique identification different districts in the largest cell multiplexing cluster;
A2: the number M that determines the corresponding basic training sequences sign indicating number of each downlink frequency pilot code concentrated with downlink frequency pilot code;
A3: the number K of determining the different spread spectrum coefficients that each sub-district can be used;
A4: according to L
i=N * M * Q
iCalculate each spread spectrum coefficient Q
iThe compound key number L that needs generation
i, and according to
Calculate total compound key number L that the largest cell multiplexing cluster is used
Always, i=1～K;
A5: generate L according to the principle that correlation is little between each code word
AlwaysIndividual compound key, and with described L
AlwaysIndividual compound key is according to each spread spectrum coefficient Q
iThe compound key number L that needs generation
iDistribute to each spread spectrum coefficient respectively, and set up every Q
iCorresponding relation between individual compound key and the basic training sequences sign indicating number;
B: according to real topology is downlink frequency pilot code of each cell allocation;
C: determine basic training sequences sign indicating number and the compound key corresponding with downlink frequency pilot code according to the relation between the various code words of step a foundation.
One or more in all basic training sequences sign indicating numbers that determined basic training sequences sign indicating number can be the downlink frequency pilot code correspondence in step a1.Downlink frequency pilot code for each cell allocation in step b is unique in the cell cluster of this sub-district and all neighbor cells composition.Code word relation among the step a between basic training sequences sign indicating number and the downlink frequency pilot code identical with the code word relation in the existing standard (shown in table 3-table 7), because the generation method of this district code word has been given each cell allocation its employed compound key, when therefore giving user's distribution service channel, need not to consider to be newly assigned to the compound key of Traffic Channel and the correlation between the compound key between the distributing user, improved the efficient that sign indicating number distributes thus.
According to compound code generating method of the present invention, the corresponding relation between original channel code and the training sequence displacement window is changed into the corresponding relation between existing compound key and the training sequence displacement window.Receiving terminal detects after the channel estimation window, just can obtain the compound key of this channel estimation window correspondence according to this corresponding relation, thereby utilizes these code channels to go to carry out Multiuser Detection.That is, for this compound code generating method of the present invention, the testing process and the detection algorithm of receiving terminal do not change, and then do not increase the complexity that detects.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (16)
1. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems, it is characterized in that this method comprises:
(1) determines the number N of first kind of sign indicating number, described first kind of sign indicating number that sign indicating number is unique identification different districts in the largest cell multiplexing cluster;
(2) the number M of each first kind of corresponding second kind of sign indicating number of sign indicating number of concentrating of the sign indicating number of determining to form with first kind of sign indicating number;
(3) determine the number of the different spread spectrum coefficients that each sub-district can be used;
(4) carry out at each spread spectrum coefficient Q: generate N * M * Q compound key according to the principle that correlation is little between each code word, described correlation be meant for a short time between each code word cross correlation value smaller or equal to default first threshold value or, described correlation be meant for a short time cross correlation value between each code word smaller or equal to the autocorrelation sequence secondary lobe of default first threshold value and each code word smaller or equal to second predetermined threshold value; N * M * Q compound key is carried out label in order, each label is in order to unique identification one compound key, according to label N * M * Q compound key is divided into N * M group, the corresponding second kind of sign indicating number of each group is to set up the corresponding relation between every Q compound key and second kind of sign indicating number.
2. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems as claimed in claim 1, it is characterized in that, the preferred value of number N described in the step (1) is 32 or 128.
3. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems as claimed in claim 2, it is characterized in that, when the number N value described in the step (1) was 32, the preferred value of the number M described in the step (2) was 4; When the number N value described in the step (1) was 128, the preferred value of the number M described in the step (2) was 1.
4. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems as claimed in claim 1, it is characterized in that, described default first threshold value and second threshold value are to set according to the product of N and M, the product of N and M is more little, sets first threshold value and second threshold value is also more little.
5. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems as claimed in claim 1, it is characterized in that, described first kind of sign indicating number is downlink frequency pilot code, and described second kind of sign indicating number is the basic training sequences sign indicating number.
6. a code word planing method is characterized in that, comprising:
(1) code word of setting up in advance between compound key, basic training sequences sign indicating number and the downlink frequency pilot code concerns;
(11) determine the number N of downlink frequency pilot code, described downlink frequency pilot code is the sign indicating number of unique identification different districts in the largest cell multiplexing cluster;
(12) the number M of the corresponding basic training sequences sign indicating number of each downlink frequency pilot code concentrated of the sign indicating number of determining to form with downlink frequency pilot code;
(13) determine the number of the different spread spectrum coefficients that each sub-district can be used;
(14) carry out at each spread spectrum coefficient Q: the principle little according to correlation generates N * M * Q compound key, described correlation be meant for a short time between each code word cross correlation value smaller or equal to default first threshold value or, described correlation be meant for a short time cross correlation value between each code word smaller or equal to the autocorrelation sequence secondary lobe of default first threshold value and each code word smaller or equal to second predetermined threshold value; N * M * Q compound key is carried out label in order, each label is in order to unique identification one compound key, according to label N * M * Q compound key is divided into N * M group, the corresponding second kind of sign indicating number of each group is to set up the corresponding relation between every Q compound key and the basic training sequences sign indicating number;
(2) be downlink frequency pilot code of each cell allocation according to the real cell topological structure;
(3) determine basic training sequences sign indicating number and the compound key corresponding according to the relation between the various code words of step (1) foundation with downlink frequency pilot code.
7. code word planing method as claimed in claim 6 is characterized in that, one or more in all basic training sequences sign indicating numbers that determined basic training sequences sign indicating number can be the downlink frequency pilot code correspondence in step (1).
8. code word planing method as claimed in claim 6 is characterized in that, the downlink frequency pilot code for each cell allocation in step (2) is unique in the cell cluster of this sub-district and all neighbor cells composition.
9. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems, it is characterized in that,
(1) determines the number N of first kind of sign indicating number, described first kind of sign indicating number that sign indicating number is unique identification different districts in the largest cell multiplexing cluster;
(2) the number M of each first kind of corresponding second kind of sign indicating number of sign indicating number of concentrating of the sign indicating number of determining to form with first kind of sign indicating number;
(3) determine the number K of the different spread spectrum coefficients that each sub-district can be used;
(4) according to L
i=N * M * Q
iCalculate each spread spectrum coefficient Q
iThe compound key number L that needs generation
i, and according to
Calculate total compound key number L that the largest cell multiplexing cluster is used
Always, i=1～K;
(5) generate L according to the principle that correlation is little between each code word
AlwaysIndividual compound key, described correlation is meant that for a short time cross correlation value between each code word is smaller or equal to default first threshold value, perhaps be meant cross correlation value between each code word smaller or equal to the autocorrelation sequence side lobe levels of default first threshold value and each code word smaller or equal to default second threshold value, and with described L
AlwaysIndividual compound key is according to each spread spectrum coefficient Q
iThe compound key number L that needs generation
iDistribute to each spread spectrum coefficient respectively, and with N * M * Q
iIndividual compound key carries out label in order, and each label connects according to label N * M * Q in order to unique identification one compound key
iIndividual compound key is divided into N * M group, and corresponding one second yard of each group is to set up every Q
iCorresponding relation between individual compound key and second kind of sign indicating number.
10. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems as claimed in claim 9, it is characterized in that, the preferred value of number N described in the step (1) is 32 or 128.
11. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems as claimed in claim 10, it is characterized in that when the number N value described in the step (1) was 32, the preferred value of the number M described in the step (2) was 4; When the number N value described in the step (1) was 128, the preferred value of the number M described in the step (2) was 1.
12. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems as claimed in claim 9, it is characterized in that, described default first threshold value and second threshold value are to set according to the product of N and M, the product of N and M is more little, and first threshold value and second threshold value of setting are also more little.
13. be used to distinguish the compound code generating method of different code channels in the cell mobile communication systems as claimed in claim 9, it is characterized in that described first kind of sign indicating number is downlink frequency pilot code, described second kind of sign indicating number is the basic training sequences sign indicating number.
14. a code word planing method is characterized in that, comprising:
(1) code word of setting up in advance between compound key, basic training sequences sign indicating number and the downlink frequency pilot code concerns;
(11) number N of true downlink frequency pilot code, described downlink frequency pilot code is the sign indicating number of unique identification different districts in the largest cell multiplexing cluster;
(12) determine the number M of the corresponding basic training sequences sign indicating number of each downlink frequency pilot code concentrated with downlink frequency pilot code;
(13) determine the number K of the different spread spectrum coefficients that each sub-district can be used;
(14) according to L
i=N * M * Q
iCalculate each spread spectrum coefficient Q
iThe compound key number L that needs generation
i, and according to
Calculate total compound key number L that the largest cell multiplexing cluster is used
Always, i=1～K;
(15) generate L according to the principle that correlation is little between each code word
AlwaysIndividual compound key, described correlation is meant that for a short time cross correlation value between each code word is smaller or equal to default first threshold value, perhaps be meant cross correlation value between each code word smaller or equal to the autocorrelation sequence side lobe levels of default first threshold value and each code word smaller or equal to default second threshold value, and with described L
AlwaysIndividual compound key is according to each spread spectrum coefficient Q
iThe compound key number L that needs generation
iDistribute to each spread spectrum coefficient respectively, and with N * M * Q
iIndividual compound key carries out label in order, and each label connects according to label N * M * Q in order to unique identification one compound key
iIndividual compound key is divided into N * M group, corresponding one second yard of each group, with
Set up every Q
iCorresponding relation between individual compound key and the basic training sequences sign indicating number;
(2) be downlink frequency pilot code of each cell allocation according to real topology;
(3) determine basic training sequences sign indicating number and the compound key corresponding according to the relation between the various code words of step (1) foundation with downlink frequency pilot code.
15. code word planing method as claimed in claim 14 is characterized in that, the downlink frequency pilot code for each cell allocation in step (2) is unique in the cell cluster of this sub-district and all neighbor cells composition.
16. code word planing method as claimed in claim 14 is characterized in that, one or more in all basic training sequences sign indicating numbers that determined basic training sequences sign indicating number can be the downlink frequency pilot code correspondence in step (1).
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1256598A (en) * | 1998-11-12 | 2000-06-14 | 朗迅科技公司 | Method and apparatus for producing complex scramble code sequence |
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|---|---|---|---|---|
| CN1256598A (en) * | 1998-11-12 | 2000-06-14 | 朗迅科技公司 | Method and apparatus for producing complex scramble code sequence |
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