CN101212788A - Frequency point selector in N-frequency point cell system - Google Patents

Abstract

The invention provides a frequency selection device used in a N-frequency areola system, which comprises an information acquisition module used for obtaining information relevant to call, a judgment module used for carrying out wireless resource tendency judgment for each frequency of all neighboring N-frequency areolas in sequence by making use of the acquired information, and a selection module used for selecting access frequency of user equipment according to the judgment obtained from the judgment module.

Description

The frequency choice device of N frequency point cell system

Technical field

The present invention relates to the communications field, specifically, the present invention relates to a kind of TD SDMA that is applicable to and insert the frequency choice device of (TD-SCDMA) system N frequency point cell.

Background technology

In the TD-SCDMA system, the theoretical heap(ed) capacity of single subdistrict is the voice user of 24 low speed 12.2k, need many cloth base station to satisfy jumbo demand at the bigger hot zones of telephone traffic, but the cost of operator has not only significantly been improved in many cloth base station, and the standing-meeting of many fabricbases causes the covering radius of sub-district to dwindle, user's switching frequency increases, thereby influences quality of services for users.In order to address this problem, Datang Mobile and Siemens organize in the 5th plenary session at C low speed A TC5WG1 and propose in June, 2004, use the technology of multicarrier in the TD-SCDMA system.On September 13rd, 2004, each large equipment manufacturer reached an agreement for overloading technical specification frequently in the tenth meeting of WG1.For the multi-carrier district of TD-SCDMA system, its characteristics are different from the multicarrier system of other cdma systems.The multi-carrier district of TD-SCDMA system is divided into a main carrier frequency and several assistant carrier frequencies, UE on all carrier frequency (User Equipment, subscriber equipment) all shared cover S-CCPCH, a PRACH, common signal channels such as DwPCH, PICH, these common signal channels only are carried on the main carrier frequency.So in fact, all frequencies in multi-carrier district all belong to a sub-district, so the switching between frequency do not belong to the switching on the ordinary meaning, and can only belong to the category that cell re-configuration is put.After introducing multi-transceiver technology, after UE resides in a frequency point cell, set up dedicated channel if desired, just relate at multi-carrier district how to carry its business for UE selects a suitable carrier frequency.Therefore, need to introduce the strategy of load balancing.

The cdma system of other standards has proposed a lot of patents about the load balancing between the multicarrier at present, and modal usually is that travelling carriage is selected a carrier wave according to hash algorithm at random at a plurality of intercarriers, and the balance between multicarrier is guaranteed by hash algorithm.Though this method can guarantee the load balancing on each carrier frequency on the long-time statistical meaning, but may appear in a period of time in a certain certain base station coverage most of travelling carriage and all select same carrier frequency by hash algorithm, thus cause load between carrier frequency the sub-district in unbalanced.In addition, record accurate multicarrier load equalization method from the base station, will newly call out to be assigned to and use the minimum carrier wave of Orthogonal Variable Spreading Factor OVSF (OVFS) channel number mainly according to minimal chain way principle; Another kind is a minimum power expense principle, selects to take the minimum power assignment of carriers and uses for new the calling.Because the code channel resource that single frequency point can bearer traffic in the TD-SCDMA system is less, therefore sign indicating number is resource-constrained in the TD system, exist simultaneously with the radio characteristics of interference or power limited (being that uplink interference is limited or descending power is limited), if with user equilibrium be assigned on each carrier frequency, will cause the surplus resources of each carrier frequency all fewer after a period of time, thereby each carrier frequency all can't satisfy the service access of two-forty or the demand of high speed business raising speed.

Otherwise, if when the user inserts, not distributing if do not guarantee the load balancing of each frequency, following problem can appear:

1. if the N frequency point cell exists more frequency of user and the less frequency of user, more frequency inserts if UE selects the user, has then increased the probability of access failure, causes the congested of whole N frequency point cell.

2. if certain frequency overload of current area then can cause stronger interference to the UE of adjacent co-frequency cell or frequency, the performance of the whole net of influence.

For switching the user, consider in the TD system greatlyyer with the interference of switching frequently, institute thinks that the switching user can preferentially select the frequency different with switching the original place of user frequency as the target frequency when selecting frequency.

More than two factors be contradiction each other, therefore it is comprehensive that people wish to design a cover, frequency selection scheme flexibly, when selecting the N frequency point cell to select frequency for the user, should fully take into account professional characteristic, fully take into account current soft capacity of each frequency and sign indicating number resource capacity situation again, to realize the call completion ratio of increase system, the purpose of capacity.

Summary of the invention

Main idea of the present invention, selects best access frequency point for the user of access N frequency point cell by the method for using fixed priority to combine with balanced allocation algorithm at the frequency choice device that a kind of TD-SCDMA of being applicable to N frequency point cell system is provided.

According to an aspect of the present invention, provide the frequency choice device of a kind of N of being used for frequency point cell system, having comprised: the information acquisition module is used to obtain the relevant information of calling out; Judge module is used to utilize this information successively each frequency of each adjacent N frequency point cell to be carried out the judgement of Radio Resource trend; And the selection module, be used for access frequency point according to judged result selection subscriber equipment.

In above-mentioned frequency choice device, judge module carries out the judgement of Radio Resource trend and comprises that judging is resource-constrained or an interference or a power limited of sign indicating number.

In above-mentioned frequency choice device, the resource-constrained basis for estimation of sign indicating number is: when TotalSRUNum＞TotalRUNum, think that frequency presents the resource-constrained radio characteristics trend of sign indicating number, wherein, TotalRUNum represents remaining basic RU quantity in the frequency, and TotalSRUNum represents frequency residue normal capacity resource units number.

In above-mentioned frequency choice device, disturb or the basis for estimation of power limited is: when TotalSRUNum＜TotalRUNum, think that frequency presents the radio characteristics trend of interference or power limited, wherein, TotalRUNum represents remaining basic RU quantity in the frequency, and TotalSRUNum represents frequency residue normal capacity resource units number.

In above-mentioned frequency choice device, utilize following formula to calculate TotalSRUNum:

$\mathrm{TotalSRUNum}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{SRUNum}}_i---\left(1\right)$

In the equation (1), SRUNum represents time slot residue standard soft capacity resource units number.In above-mentioned frequency choice device, utilize following formula to calculate SRUNum _i: up direction:

$\mathrm{SRUN}{\mathrm{um}}_i=\frac{I_{\mathrm{thrsh}}-I_{\mathrm{current}}\left(i\right)}{\mathrm{SRU}}---\left(2\right)$

In the equation (2), I _ThrshExpression up-admission control interference threshold, I _Current(i) interference level of time slot i before the new user of expression inserts, SRU represents up direction standard soft capacity resource units;

Up direction: $\mathrm{SRUN}{\mathrm{um}}_i=\frac{P_{\mathrm{thrsh}}-P_{\mathrm{current}}\left(i\right)}{\mathrm{SRU}}---\left(3\right)$

In the equation (3), P _ThrshExpression descending acceptance power controlling thresholding, P _Current(i) power level of time slot i before the new user of expression inserts, SRU represents down direction standard soft capacity resource units.

In above-mentioned frequency choice device, utilize following formula to calculate SRU:

Up direction: $\mathrm{SRU}=\frac{I_{\mathrm{thrsh}}-N_0}{16}---\left(4\right)$

In the equation (4), I _ThrshControl interference threshold, N are admitted in expression ₀It is hot-tempered that the expression time slot does not insert the end of the system before the Any user, the RU quantity of a time slot in the expression of 16 in the denominator TD-SCDMA system;

Down direction: $\mathrm{SRU}=\frac{P_{\mathrm{thrsh}}-N_0}{16}---\left(5\right)$

In the equation (5), P _ThrshThe power threshold of expression descending acceptance control, N ₀The expression time slot does not insert the end of the system before the Any user and makes an uproar, the RU quantity of a time slot in the expression of 16 in the denominator TD-SCDMA system.

In above-mentioned frequency choice device, if wherein at least one frequency is sign indicating number when resource-constrained, then select module that these frequencies are exported in proper order according to default frequency access priority, the indication subscriber equipment attempts inserting the N frequency point cell according to the order of this sequence; If all frequencies all are to disturb or power limited, then select module that all frequencies are exported according to TotalSRUNum order from big to small, the indication subscriber equipment attempts inserting the N frequency point cell according to the order of subsequence.

In above-mentioned frequency choice device, default frequency access priority is taked opposite default frequency access priority for the low speed business and the high speed business of each adjacent N frequency point cell in proper order.

In above-mentioned frequency choice device, when the professional and high speed business of the low speed of each adjacent N frequency point cell is taked opposite default frequency access priority, the neighbor cell default priorities is staggered as far as possible mutually.

The present invention can farthest improve the code channel utilance of N frequency point cell, reduces the probability that the code channel fragment produces, and significantly improves the access success rate of high speed business, makes system that support to high speed business is provided better.Simultaneously the load condition that can share each frequency between different districts effectively equally by the method and the algorithm policy of network planning network optimization reduces the interference of system effectively, improves professional service quality.

Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 shows the flow chart according to the frequency point selecting method that is used for N frequency point cell system of the embodiment of the invention;

Fig. 2 shows the flow chart of a specific embodiment of the present invention; And

Fig. 3 shows the frequency choice device according to N frequency point cell of the present invention system.

Embodiment

Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.

Fig. 1 shows the flow chart according to the frequency point selecting method that is used for N frequency point cell system of the embodiment of the invention, and it may further comprise the steps:

Step S102 obtains the relevant information of calling out;

Step S104 utilizes this information successively each frequency of each adjacent N frequency point cell to be carried out the judgement of Radio Resource trend; And

Step S106 is according to the access frequency point of judged result selection subscriber equipment.

Specifically, the present invention includes following steps,

Step S102 obtains and calls out relevant information, comprises RAB, and the call business type is called out the information such as demand to resource.

Step S104 utilizes above-mentioned information successively each frequency to be carried out the judgement of resource-constrained still interference of sign indicating number or power limited.

Step S106, if when existing a frequency to present the resource-constrained radio characteristics trend of sign indicating number at least, then the frequency that these are satisfied condition is exported in proper order according to default frequency access priority, indication UE attempts inserting the N frequency point cell according to the order of this sequence.When if all frequencies all present the radio characteristics trend of interference or power limited, then all frequencies are exported according to TotalSRUNum order from big to small, indication UE attempts inserting the N frequency point cell according to the order of subsequence.Wherein, professional default access frequency point priority of the low speed of each adjacent N frequency point cell and the default frequency access priority of high speed business in the configuration network guarantee that the neighbor cell default priorities staggers as far as possible mutually.

In step S106, professional default access frequency point priority of low speed and the default frequency access priority of high speed business are meant the priority of and high speed business default access frequency point professional for low speed.

Most low speed business belongs to the professional only less basic RU (ResourceUnit) of needs of low speed, and majority can single time slot carrying.And the basic RU that high speed business takies please provide Chinese and English title more, often needs to stride the time slot carrying.Insert the sub-district too much and all be spread out on each frequency for fear of the low speed business, thereby the surplus resources that causes each frequency can't satisfy the access of high speed business, or allow high speed business not have the space of raising speed, but the total residue RU resource of all frequencies still can satisfy the demands.Therefore, in the present invention, for the professional default access frequency point priority orders opposite of low speed with the high speed business employing.

It is example that table 1 has provided with 3 frequency point cells, the default frequency access priority order of configuration low speed business and high speed business.

As shown in table 1, if the N frequency point cell inserts a low speed business, then preferential access frequency point Freq01 under the default situations is Freq02 then, considers Freq03 at last again; For high speed business, then adopted fully opposite access order.Adopt the mode of this default configuration, then can guarantee to a certain extent, with convenient its bigger traffic carrying capacity of carrying to high speed business reserves more idle time slot or code channel resource.

The professional default access frequency point order of table 1 high speed business and low speed

Frequency point number	The professional default access frequency point order of low speed	The default access frequency point order of high speed business
			Freq01	1	3
Freq02	2	2
			Freq03	3	1

In fact using default frequency access order (" complete opposite access order " promptly mentioned above) to select frequency is a kind of strategy of lack of balance, when adopting the frequency access strategy of lack of balance, should fully take into account the interference problem of the influence of neighbor cell on every side.If adjacent N frequency point cell adopts identical default frequency access order, if then most of call business type is identical, the inevitable influence each other of frequency (the particularly higher frequency of priority) that the default preferential order of level earlier is identical is very big.Therefore, by network planning network optimization method for parameter configuration, a plurality of default frequency access priorities with frequency N frequency point cell are staggered, to reach annoyance level is dropped to minimum level, Here it is, and so-called neighbor cell default priorities staggers.

As can be seen from Figure 2, if the default access frequency point priority configuration of Cell01～Cell06 is identical, if the order of the default frequency access priority indication of user's foundation inserts each sub-district so, then six sub-district phase mutual interference are bigger; If the default access frequency point priority configuration of Cell01～Cell06 is staggered, UE still inserts according to the indicated order of default access frequency point priority, and then six sub-districts are disturbed less each other.

The professional default access priority order of each frequency low speed of adjacent 3 frequency point cells of table 2

For execution in step S104, also defined among the present invention and a kind ofly judged that frequency is in and present the resource-constrained radio characteristics trend of sign indicating number and still present and disturb or the method for power limited radio characteristics trend.

The resource-constrained criterion of sign indicating number: when TotalSRUNum＞TotalRUNum, think that frequency presents the resource-constrained radio characteristics trend of sign indicating number, the bottleneck that frequency inserts new user is the quantity of code channel resource available in the frequency.

Disturb or the power limited criterion: when TotalSRUNum＜TotalRUNum, think that frequency presents to disturb or the radio characteristics trend of power limited that the bottleneck that frequency inserts new user is annoyance level or the watt level that can also tolerate in the frequency.

In above criterion, TotalRUNum represents remaining basic RU quantity in the frequency, basic RU just spreading factor is that 16 code channel can the loaded service amount, TotalSRUNum represents frequency residue normal capacity resource units number, represents on the frequency/the residue standard soft capacity units sum of all time slots of down direction.Can utilize following formula to calculate TotalSRUNum.

$\mathrm{TotalSRUNum}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{SRUNum}}_i---\left(1\right)$

In the equation (1), SRUNum _iExpression time slot residue standard soft capacity resource units number: time slot residue standard soft capacity resource units numerical table shows what standard soft capacity resource units numbers interference current in the time slot or power headroom can carry.This value can be calculated by following formula.

Up direction: $\mathrm{SRUN}{\mathrm{um}}_i=\frac{I_{\mathrm{thrsh}}-I_{\mathrm{current}}\left(i\right)}{\mathrm{SRU}}---\left(2\right)$

In the equation (2), I _ThrshExpression up-admission control interference threshold, I _Current(i) interference level of time slot i before the new user of expression inserts, SRU represents up direction standard soft capacity resource units.

Up direction: $\mathrm{SRUN}{\mathrm{um}}_i=\frac{P_{\mathrm{thrsh}}-P_{\mathrm{current}}\left(i\right)}{\mathrm{SRU}}---\left(3\right)$

In the equation (3), P _ThrshExpression descending acceptance power controlling thresholding, P _Current(i) power level of time slot i before the new user of expression inserts, SRU represents down direction standard soft capacity resource units.

In equation (2) and (3), SRU represents standard soft capacity resource units: interference size that basic RU of standard soft capacity unit representation can tolerate or the watt level that can carry.This value can be calculated by following formula, up direction:

$\mathrm{SRU}=\frac{I_{\mathrm{thrsh}}-N_0}{16}---\left(4\right)$

In the equation (4), I _ThrshControl interference threshold, N are admitted in expression ₀It is hot-tempered that the expression time slot does not insert the end of the system before the Any user, the RU quantity of a time slot in the expression of 16 in the denominator TD-SCDMA system.

Down direction: $\mathrm{SRU}=\frac{P_{\mathrm{thrsh}}-N_0}{16}---\left(5\right)$

In the equation (5), P _ThrshThe power threshold of expression descending acceptance control, N ₀The expression time slot does not insert the end of the system before the Any user and makes an uproar, the RU quantity of a time slot in the expression of 16 in the denominator TD-SCDMA system.

Fig. 2 shows the flow chart of a specific embodiment of the present invention, and concrete implementation step is as follows:

Step S202: by the default frequency access priority of low speed and the default frequency access priority of high speed business of a plurality of adjacent N frequency point cells in the mode configuration network of network planning network optimization.

Step S204: obtain the type of service of call business, information such as traffic needs.

Step S206: the TotalRUNum and the TotalSRUNum that calculate each frequency.

Step S208: judge the type of current call business, if signaling or low speed business, then execution in step S210; Otherwise, execution in step S220

Step S210: travel through all frequencies in proper order according to the professional default access priority of low speed.

Step S212: utilize the criterion in the invention to judge that current frequency presents code channel resource radio characteristics trend at first? then current frequency is joined candidate collection, execution in step S214; Otherwise, execution in step S214.

Does step S214: judging that all frequencies travel through finish? if not, execution in step S208 then; If, execution in step S216 then.

Step S216: judge that candidate collection is empty? if, then indicate UE to attempt inserting the sub-district according to the order in the candidate collection, return; Otherwise, execution in step S218.

Step S218: all frequencies are sorted according to TotalSRUNum order from big to small, and indication UE attempts inserting the sub-district in proper order according to this, returns.

Step S220: travel through all frequencies in proper order according to the default access priority of high speed business.

Step S222: utilize the criterion in the invention to judge that current frequency presents code channel resource radio characteristics trend at first? if then current frequency is joined candidate collection, execution in step S224; Otherwise, execution in step S224.

Does step S224: judging that all frequencies travel through finish? if not, execution in step S220 then; If, execution in step S226 then.

Step S228: judge that candidate collection is empty? if then indicate UE to attempt inserting the sub-district according to the order in the candidate collection; Otherwise, execution in step S218.

Fig. 3 shows the frequency choice device 300 according to N frequency point cell of the present invention system, and this device comprises: information acquisition module 302 is used to obtain the relevant information of calling out; Judge module 304 is used to utilize this information successively each frequency of each adjacent N frequency point cell to be carried out the judgement of Radio Resource trend, and wherein, judge module 304 carries out the judgement of Radio Resource trend and comprises that judging is resource-constrained or an interference or a power limited of sign indicating number; And select module 306, be used for selecting the access frequency point of subscriber equipment according to judged result.

The resource-constrained basis for estimation of sign indicating number is: when TotalSRUNum＞TotalRUNum, think that frequency presents the resource-constrained radio characteristics trend of sign indicating number, wherein, TotalRUNum represents remaining basic RU quantity in the frequency, and TotalSRUNum represents frequency residue normal capacity resource units number.

Disturb or the basis for estimation of power limited is: when TotalSRUNum＜TotalRUNum, think that frequency presents the radio characteristics trend of interference or power limited, wherein, TotalRUNum represents remaining basic RU quantity in the frequency, and TotalSRUNum represents frequency residue normal capacity resource units number.

Utilize following formula to calculate TotalSRUNum:

$\mathrm{TotalSRUNum}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{SRUNum}}_i---\left(1\right)$

In the equation (1), SRUNum _iExpression time slot residue standard soft capacity resource units number.

Utilize following formula to calculate SRUNum _i:

Up direction: $\mathrm{SRUN}{\mathrm{um}}_i=\frac{I_{\mathrm{thrsh}}-I_{\mathrm{current}}\left(i\right)}{\mathrm{SRU}}---\left(2\right)$

In the equation (2), I _ThrshExpression up-admission control interference threshold, I _Current(i) interference level of time slot i before the new user of expression inserts, SRU represents up direction standard soft capacity resource units;

Up direction: $\mathrm{SRUN}{\mathrm{um}}_i=\frac{P_{\mathrm{thrsh}}-P_{\mathrm{current}}\left(i\right)}{\mathrm{SRU}}---\left(3\right)$

In the equation (3), P _ThrshExpression descending acceptance power controlling thresholding, P _Current(i) power level of time slot i before the new user of expression inserts, SRU represents down direction standard soft capacity resource units.

Utilize following formula to calculate SRU:

Up direction: $\mathrm{SRU}=\frac{I_{\mathrm{thrsh}}-N_0}{16}---\left(4\right)$

In the equation (4), I _ThrshControl interference threshold, N are admitted in expression ₀It is hot-tempered that the expression time slot does not insert the end of the system before the Any user, the RU quantity of a time slot in the expression of 16 in the denominator TD-SCDDMA system;

Down direction: $\mathrm{SRU}=\frac{P_{\mathrm{thrsh}}-N_0}{16}---\left(5\right)$

In the equation (5), P _ThrshThe power threshold of expression descending acceptance control, N ₀The expression time slot does not insert the end of the system before the Any user and makes an uproar, the RU quantity of a time slot in the expression of 16 in the denominator TD-SCDMA system.

If wherein at least one frequency is sign indicating number when resource-constrained, then select module 306 that these frequencies are exported in proper order according to default frequency access priority, the indication subscriber equipment attempts inserting the N frequency point cell according to the order of this sequence; If all frequencies all are to disturb or power limited, then select module 306 that all frequencies are exported according to TotalSRUNum order from big to small, the indication subscriber equipment attempts inserting the N frequency point cell according to the order of subsequence.

Default frequency access priority is taked opposite default frequency access priority for the low speed business and the high speed business of each adjacent N frequency point cell in proper order, and, when professional the and high speed business of the low speed of each adjacent N frequency point cell is taked opposite default frequency access priority, the neighbor cell default priorities is staggered as far as possible mutually.

The present invention can farthest improve the code channel utilance of N frequency point cell, reduces the probability that the code channel fragment produces, and significantly improves the access success rate of high speed business, makes system that support to high speed business is provided better.Simultaneously the load condition that can share each frequency between different districts effectively equally by the method and the algorithm policy of network planning network optimization reduces the interference of system effectively, improves professional service quality.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a frequency choice device that is used for N frequency point cell system is characterized in that, comprising:

The information acquisition module is used to obtain the relevant information of calling out;

Judge module is used to utilize described information successively each frequency of described each adjacent N frequency point cell to be carried out the judgement of Radio Resource trend; And

Select module, be used for selecting the access frequency point of subscriber equipment according to judged result.

2. frequency choice device according to claim 1 is characterized in that, described judge module carries out the judgement of Radio Resource trend and comprises that judging is resource-constrained or an interference or a power limited of sign indicating number.

3. frequency choice device according to claim 2, it is characterized in that, the resource-constrained basis for estimation of described sign indicating number is: when TotalSRUNum＞TotalRUNum, think that described frequency presents the resource-constrained radio characteristics trend of sign indicating number, wherein, TotalRUNum represents remaining basic RU quantity in the frequency, and TotalSRUNum represents frequency residue normal capacity resource units number.

4. frequency choice device according to claim 2, it is characterized in that, the basis for estimation of described interference or power limited is: when TotalSRUNum＜TotalRUNum, think that described frequency presents the radio characteristics trend of interference or power limited, wherein, TotalRUNum represents remaining basic RU quantity in the frequency, and TotalSRUNum represents frequency residue normal capacity resource units number.

5. according to claim 3 or 4 described frequency choice devices, it is characterized in that TotalSRUNum utilizes following formula to calculate:

$\mathrm{TotalSRUNum}=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{SRUNu}{m}_i---\left(1\right)$

In the equation (1), SRUNum _iExpression time slot residue standard soft capacity resource units number.

6. frequency choice device according to claim 5 is characterized in that SRUNum _iUtilize following formula to calculate:

Up direction: ${\mathrm{SRUNum}}_i=\frac{I_{\mathrm{thrsh}}-I_{\mathrm{current}}\left(i\right)}{\mathrm{SRU}}---\left(2\right)$

In the equation (2), I _ThrshExpression up-admission control interference threshold, I _Current(i) interference level of time slot i before the new user of expression inserts, SRU represents up direction standard soft capacity resource units;

Up direction: ${\mathrm{SRUNum}}_i=\frac{P_{\mathrm{thrsh}}-P_{\mathrm{current}}\left(i\right)}{\mathrm{SRU}}---\left(3\right)$

In the equation (3), P _ThrshExpression descending acceptance power controlling thresholding, P _Current(i) power level of time slot i before the new user of expression inserts, SRU represents down direction standard soft capacity resource units.

7. frequency choice device according to claim 6 is characterized in that, SRU utilizes following formula to calculate:

Up direction: $\mathrm{SRU}=\frac{I_{\mathrm{thrsh}}-N_0}{16}---\left(4\right)$

In the equation (4), I _ThrshControl interference threshold, N are admitted in expression ₀It is hot-tempered that the expression time slot does not insert the end of the system before the Any user, the RU quantity of a time slot in the expression of 16 in the denominator TD-SCDMA system;

Down direction: $\mathrm{SRU}=\frac{I_{\mathrm{thrsh}}-N_0}{16}---\left(5\right)$

In the equation (5), P _ThrshThe power threshold of expression descending acceptance control, N ₀The expression time slot does not insert the end of the system before the Any user and makes an uproar, the RU quantity of a time slot in the expression of 16 in the denominator TD-SCDMA system.

8. frequency choice device according to claim 3, it is characterized in that, if wherein at least one frequency is that sign indicating number is when resource-constrained, then described selection module is exported these frequencies in proper order according to default frequency access priority, indicates described subscriber equipment to attempt inserting the N frequency point cell according to the order of this sequence; If all frequencies all are to disturb or power limited, then select module that all frequencies are exported according to TotalSRUNum order from big to small, indicate described subscriber equipment to attempt inserting the N frequency point cell according to the order of subsequence.

9. frequency choice device according to claim 1 is characterized in that, described default frequency access priority is taked opposite default frequency access priority for the low speed business and the high speed business of each adjacent N frequency point cell in proper order.

10. frequency choice device according to claim 9 is characterized in that, when the professional and high speed business of the low speed of each adjacent N frequency point cell is taked opposite default frequency access priority, the neighbor cell default priorities is staggered as far as possible mutually.

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