CN1735261A - Up-load estimating method in mobile communication system - Google Patents

Abstract

This invention relates to load estimation technique in mobile communication system and discloses a method to estimate the upper load and make the estimation not only avoid the error brought by static error of RTWP absolute measurement value but also calculate the real dynamic varying effect of disturbance rate from other sub zones and decreases the estimation error. Wherein, using theoretical derived result to divide the disturbance rate from other sub zones into static part obtained by simulation or experiment statistical average, and dynamic part determined by relative detection value for all sub zones state information; then according to the disturbance rate from other sub zones and local sub zone self disturbance upper load factor, calculating and obtaining the upper load factor of local sub zone.

Description

Ascending load method of estimation in the mobile communication system

Technical field

The present invention relates to the load estimation technique of mobile communication system, particularly the load estimation technique of WCDMA mobile communication system.

Background technology

Sharp increase along with social progress and mobile communication subscriber quantity, the frequency resource growing tension, require mobile communication system that bigger power system capacity can be provided, higher communication quality, and the data service of two-forty can be provided, to satisfy people to the requirement of multimedia communication and adapt to the personalized developing direction of communication.

3-G (Generation Three mobile communication system) is to satisfy (the InternationalTelecommunication Union of International Telecommunications Union, abbreviation " ITU ") international mobile communication (the InternationalMobile Telecommunication 2000 that proposes, be called for short " IMT-2000 ")/following public land mobile (the Future Public Land Mobile Telephone Systems of system, abbreviation " FPLMTS ") third generation mobile communication system of standard, requirement has good network compatibility, can realize the roaming between a plurality of different systems in the global range, not only will be for the mobile subscriber provide speech and low-rate data business, and multimedia service widely will be provided.

The main candidate scheme of 3-G (Generation Three mobile communication system) is code division multiple access (the Code DivisionMultiple Access of North America, be called for short " CDMA ") 2000 systems, Wideband Code Division Multiple Access (WCDMA) (the WidebandCode Division Multiple Access in Europe, be called for short " WCDMA ") system and Chinese TD SDMA (Time Division Synchronous Code Division Multiple Access, be called for short " TD-SCDMA ") system, all be to be based upon on code division multiple access (CDMA) technical foundation, CDMA extensively has been received as the important technology of 3-G (Generation Three mobile communication system).

CDMA mobile communication system has high power capacity, spectral efficient, high quality-of-service, low cost, high security, is easy to advantages such as seamless switching and grand diversity.Also having simultaneously shortcoming, cdma system is an interference limiting system but not resource limited system, and its capacity is subjected to the restriction that multiple access disturbs between the user (MultipleAccess Interference is called for short " MAI ").In the cdma communication system of reality, the multiple access that causes owing to the different user correlation between signals disturbs, along with the increase of number of users or the increase of signal power, had a strong impact on the cdma communication system communication quality, directly limited the raising of cdma system capacity, coverage and performance.

Power is common source in the cdma wireless network, the capacity of cdma system is a kind of soft capacity, is a self-interference system, and each user constitutes interference to other users, each sub-district all constitutes other sub-district disturbs, and link performance and power system capacity depend on the control result of interference power.Work such as therefore, interference analysis, power configuration and soft handover planning seem particularly important.But because the various factors mutual restriction is often pulled one hair and move the whole body.

Admission Control (Call Admission Control in the present WCDMA system, be called for short " CAC ") and load control (Load Control, abbreviation " LC ") technology is crucial RRM (Radio Resources Management, be called for short " RRM ") method, carry out by RRM core controller radio network controller (Radio Network Controller is called for short " RNC ").

Because the calling of each new access all can increase the interference level of ongoing calling and to the interference level of neighbor cell, influence quality of service in the cdma system.Therefore, in the WCDMA system, adopted call admission control method to call out the control of access, to avoid a new calling that inserts to cause the quality of service of ongoing all-calls to descend, cause the situation of one or more calling call drops to take place even.In the Admission Control process, RNC judges whether enough vacant Radio Resource is arranged in the sub-district, make and insert signal interference ratio (the Signal-To-Interference Ratio that needs are certain, be called for short " SIR ") and fast new user or the switching user of sign indicating number, the load of system can not surpass certain thresholding of predesignating.Increase new business or increase the situation of user's service rate for the user in calling out, also can carry out access and call out control.About the call admission control method of WCDMA system, see also third generation partner program (3rd Generation Partnership Project is called for short " 3GPP ") agreement FS25.215 and TS25.922 in detail.

Consider the uncertain factor in the mobile communication, such as the adjacent area to the interference variations of this sub-district, environment to the influence of wireless channel etc., RNC can also adopt load control to carry out RRM more reliably.Different with Admission Control is, load control is a continuous process, and Admission Control is event driven process.Load control guarantees that the load of system maintains some predesignate below horizontal.It need carry out continuous supervision to system load.Such as, load control is carried out continuous measurement to system load, when system load overloads, then require to take certain measure to reduce the load of system, the system that makes is unlikely to collapse, such as the speed that reduces the certain user, postpone those data of emission to the insensitive business of time delay, perhaps directly allow other conversation loss of low priority.

Admission Control and load control all needs system load is measured or estimated, whether surpass the thresholding of certain regulation and judge whether to insert the user with the load of determining current system, whether perhaps definite system load overloads and judges whether starting load control.In cdma system, because the load of up-downgoing is asymmetric, therefore measurement and the estimation to system load also is that up-downgoing separates.As seen the accuracy of ascending load estimation has directly influenced the performance of Admission Control and load control, and RRM even whole C DMA systematic function are had very large influence.

Document [1] (H.Holma and A.Toskala, " WCDMA for UMTS, " John Wiley﹠amp; Sons Inc., 2000) two kinds of ascending load methods of estimation have been provided in.

First method is based on and receives the broadband gross power method of (Received Total Wideband Power is called for short " RTWP "), by the ratio calculation ascending load factor of RTWP and background noise.Its computing formula is as follows:

${\mathrm{\η}}_{\mathrm{UL}}=1-\frac{P_N}{I_{\mathrm{Total}}}---\left(1\right)$

Wherein, η _ULBe the ascending load factor, P _NBe background noise, I _TotalAccept gross power for the base station is up, promptly aforementioned RTWP value.

Based on the method for estimation of RTWP is directly to measure according to the definition of the ascending load factor, and measured value be as long as the situation of real system can truly be reflected in the precision higher position here, and considered the influence of other sub-districts and environment.Yet owing to the error of absolute method of measurement of RTWP very big (referring to document [2] 3GPP TS 25.133V3.14.0) in real system, therefore the evaluated error of load factor is very big, particularly ambient temperature is bigger to the influence of measurement mechanism gain, causes measured value to produce static skew.The relative measurement error ratio that it should be noted that base station RTWP is less, because in the relative value of RTWP, can be cancelled out each other by the static shift that temperature causes.

Second method is to suppose that earlier other sub-districts and this sub-district are constant to the ratio (the F factor) of base station interference, obtain the load factor that this community user brings by adding up of load factor then to unique user, count the load factor that bring other sub-districts according to the F factor again, obtain the load factor of system at last, this method is called F factor method.

In F factor method, consider that the power control of cdma system makes each user's received power arrive certain target signal interference ratio in the base station everywhere convergent, then have for j user in the sub-district:

Consider that user's processing gain can be calculated by spreading rate and service rate, therefore have,

${\left(\frac{E_b}{N_o}\right)}_j=\frac{W}{R_j}\·\frac{P_{\mathrm{RX},j}}{I_{\mathrm{Total}}-P_{\mathrm{RX},j}}---\left(3\right)$

Wherein, (E _b/ N _o) _jBe the target signal interference ratio of j customer service inserting, W is a spreading rate, R _jIt is j user's service rate.To P _{RX, j}It is j user's incoming level.

Obtain P easily _{RX, j}Expression formula be,

$P_{\mathrm{RX},j}=\frac{1}{1+\frac{(W/R_j)}{{(E_b/N_o)}_j}}{I}_{\mathrm{Total}---\left(4\right)}$

Again because the load factor L of user j _jBe defined as the ratio of the incoming level of user j, promptly to total received power

$L_j=\frac{P_{\mathrm{RX},j}}{I_{\mathrm{Total}}}=\frac{1}{1+\frac{(W/R_j)}{{(E_b/N_o)}_j}}---\left(5\right)$

Consider the situation of a sub-district, always disturb to all users' incoming level sum the sub-district that obtains except that background noise, be expressed as,

$I_{\mathrm{Total}}-P_N=\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{P}_j=\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{L}_j{I}_{\mathrm{Total}}={\mathrm{\η}}_{\mathrm{UL}}\·I_{\mathrm{Total}}---\left(6\right)$

Wherein, N is a number of users in this sub-district, η _ULBe the ascending load factor.

In real system, also need the power of considering that activation of service consumes, therefore can obtain considering that the expression of the resulting ascending load factor of this community user is,

${\mathrm{\η}}_{\mathrm{UL}}=\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{L}_j=\underset{j=1}{\overset{N}{\mathrm{\Σ}}}\frac{v_j}{1+\frac{(W/R_j)}{{(E_b/N_o)}_j}}---\left(7\right)$

V wherein _jIt is the activation of service factor.

In the real system, also there is transregional interference between the different districts, therefore need counts the disturbing effect of other sub-district this sub-district.F factor method has supposed that other sub-district can represent with a constant parameter factors F this area interference ratio as previously mentioned, thereby obtain counting other sub-district to the total load factor value representation in this sub-district after this area interference be,

${\mathrm{\η}}_{\mathrm{UL}}=(1+F)\·\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{L}_j=(1+F)\·\underset{j=1}{\overset{N}{\mathrm{\Σ}}}\frac{v_j}{1+\frac{(W/R_j)}{{(E_b/N_o)}_j}}---\left(8\right)$

The F factor be other sub-district of statistical average to this area interference ratio, it can determine by emulation, thereby generally is to estimate under all sub-districts evenly distribute the much the same situation of the uplink interference of each sub-district the supposition user to obtain.And in fact, the dynamic change of F value and concrete wireless channel environment, cell layout and other sub-district and this cell load is relevant, but in the present load estimating method, all use the interference ratio of a statistical average to estimate, this just inevitably brings because the error that the loading condition dynamic change is produced between the different districts.

As seen, F factor method does not need to adopt absolute measurement information, has avoided because aforementioned static is offset the error of being brought, and it comes the computational load factor according to characteristic and other sub-district of business to the assembly average of the disturbing effect of this sub-district.But in the real system, because other sub-district is not constant to the interference ratio of this sub-district, be different at first for different districts, low at this cell load and under the situation that the peripheral cell load is high, other sub-district is to this area interference ratio height, otherwise other sub-district is low to this area interference ratio; Secondly inscribing when the difference for same sub-district also is dynamic change, and the number of users of each sub-district and load all are dynamic changes, so other sub-district also inevitably will change to this area interference ratio.As seen, the F factorization method can not be considered the dynamic effect of other sub-districts to this area interference ratio, in actual applications, must cause bigger ascending load evaluated error.

In actual applications, there is following problem in such scheme: be subjected to the measure error restriction of RTWP absolute value based on the estimation accuracy of RTWP, F factor method estimates that accuracy is subjected in the practical application other sub-districts to the dynamic effects of this area interference ratio, therefore the evaluated error of resulting ascending load is all very big, can not satisfy requirement of actual application well.

Cause the main cause of this situation to be, directly adopted the absolute measured value of RTWP to estimate, inevitably brought the error that static shift produced based on the method for estimation of RTWP; F factor method adopts other constant sub-districts that the assembly average of this area interference ratio is estimated, there is error in other sub-districts of this and dynamic change to the actual value of this area interference ratio.

Summary of the invention

In view of this, main purpose of the present invention is to provide ascending load method of estimation in a kind of mobile communication system, the feasible error that static shift brought that can avoid the RTWP absolute measured value to the estimation of ascending load, can count the effect of other sub-districts again well, reduce the ascending load evaluated error the actual value dynamic change of this area interference ratio.

For achieving the above object, the invention provides ascending load method of estimation in a kind of mobile communication system, comprise following steps,

A sets this sub-district static parameter factor;

B is according to the ratio of the state information amount of the state information amount of this sub-district and other sub-districts, and described this sub-district static parameter factor, calculates other sub-districts to this area interference ratio;

C calculates this ascending load of cell factor according to the ascending load factor of described other sub-districts to this area interference ratio and this sub-district self interference;

Wherein, described this sub-district static parameter factor be used for indicating described other sub-districts to this area interference than changing static constant part along with allocation of radio resources, the ratio of the state information amount of described this sub-district and the state information amount of other sub-districts be used for indicating described other sub-districts to this area interference than along with allocation of radio resources changes and the part of dynamic change.

Wherein, described ascending load method of estimation is applied in the access control or load control of the base station in the WCDMA mobile communication system.

In the described steps A, the setting of described this sub-district static parameter factor is carried out according to emulation or result of experiment.

The T of state information amount described in the described step B _mCalculate according to following formula:

$T_m=I_{\mathrm{Total}}^m\·\underset{j=1}{\overset{N_m}{\mathrm{\Σ}}}\frac{v_j^m}{1+\frac{J_j^m}{{\mathrm{\γ}}_j^m}}$

I wherein _Total ^mBe the reception broadband gross power of sub-district, J _j ^mBe the target signal interference ratio of j customer service in the sub-district, γ _j ^mBe the ratio of the service rate of spreading rate in the sub-district and j customer service, v _j ^mBe the activation of service factor of j customer service in the sub-district, N _mBe the customer service number in the sub-district.

This sub-district static parameter factor obtains by the statistical average to following formula described in the described steps A,

$C_m=\frac{\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}(I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{L_{j,s}^s}{L_{j,m}^s}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}})}{\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}(I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}})}$

Wherein, C _mBe described this sub-district static parameter factor, P _mBe the number of described other sub-districts, I _Total ^sBe the reception broadband gross power of s other sub-districts, N _sBe the customer service number in described s other sub-districts, L _{J, s} ^sBe the path loss of the Radio Link between the base station of j customer service in described s other sub-districts and described s other sub-districts, L _{J, m} ^sBe the path loss of Radio Link between the base station of j customer service in described s other sub-districts and described this sub-district, J _j ^sBe the target signal interference ratio of j customer service in described s other sub-districts, γ _j ^sBe the ratio of the service rate of spreading rate in described s other sub-districts and j customer service, v _j ^sThe activation of service factor for j customer service in described s other sub-districts.

Step B comprises following substep,

B1 measures the absolute measured value of the state information amount of the absolute measured value of state information amount of described this sub-district and described other sub-districts;

B2 is obtained the ratio of the state information amount of the state information amount of described this sub-district and other sub-districts by the ratio of the absolute measured value sum of the state information amount of the absolute measured value of the state information amount of described this sub-district and all described other sub-districts;

B3 obtains described other sub-districts to this area interference ratio by the static parameter factor that the ratio of the state information amount of the state information amount of described this sub-district and other sub-districts multiply by described this sub-district.

Other sub-districts calculate according to following formula this area interference beguine described in the described step B,

$F=\frac{C_m\·\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}{T}_s}{T_m}$

Wherein, F is that described other sub-districts are to this area interference ratio, C _mBe described this sub-district static parameter factor, T _mDescribed cell status information amount, T _sBe described s other cell status information amounts, P _mNumber for described other sub-districts.

The ascending load factor that disturb this sub-district described in the described step C self calculates according to following formula,

${\mathrm{\η}}_{\mathrm{ULo}}^m=\underset{j=1}{\overset{N}{\mathrm{\Σ}}}\frac{v_j}{1+\frac{J_j}{{\mathrm{\γ}}_j}}$

Wherein, η _ULo ^mBe the ascending load factor that disturb described sub-district self, J _jBe the target signal interference ratio of j customer service in this sub-district, γ _jBe the ratio of the service rate of spreading rate in described this sub-district and j customer service, v _jBe the activation of service factor of j customer service in described this sub-district, customer service number in described this sub-district of N.

This ascending load of cell factor calculates according to following formula described in the described step C,

${\mathrm{\η}}_{\mathrm{UL}}^m=(1+F)\·{\mathrm{\η}}_{\mathrm{ULo}}^m$

Wherein, F is that described other sub-districts are to this area interference ratio, η _ULo ^mThe ascending load factor for described sub-district self interference.

Described other sub-districts can only comprise the adjacent cell of described this sub-district.

By relatively finding, technical scheme difference with the prior art of the present invention is, adopting the theoretical derivation result is static part and dynamic part with other sub-districts to the score of this area interference, wherein static part is on average obtained by emulation or experiment statistics, dynamic part is determined by the relative measurement value of the state information amount of other sub-districts and this sub-district, according to the ascending load factor of other sub-districts, calculate this ascending load of cell factor again to this area interference ratio and this sub-district self interference.

Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly owing to considered static part and the dynamic part comprehensive effect of other sub-districts to the interference ratio of this sub-district, the actual motion-change effect of Kao Lving well, improve the ascending load factor greatly and estimated accuracy, dynamic part is determined by the relative measurement value of the state information amount of other sub-districts and this sub-district simultaneously, therefore the static shift error of having avoided absolute measured value to bring has effectively further improved the estimation accuracy of the ascending load factor.

Description of drawings

Fig. 1 is that neighbor cell according to an embodiment of the invention produces the physical mechanism schematic diagram that disturbs to this sub-district;

Fig. 2 is an ascending load method of estimation flow chart according to an embodiment of the invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

The present invention is according to the relative size information of the total received power measured value of the total received power measured value of adjacent other sub-districts and this sub-district, dynamically determine the interference ratio of other sub-districts to this sub-district, thereby considered the motion-change effect in the practical application, and the relative measurement value information that is adopted can effectively avoid the influence that static shift brought in the absolute measured value, and therefore the estimated ascending load precision that obtains is greatly improved.Here define the C factor and be described according to the relative measurement value information other sub-districts of dynamically determining to the interference ratio of this sub-district, therefore the ascending load method of estimation that is adopted is called C factor method.

C factor method is utilized the total received power measured value of adjacent other sub-districts, calculate of the influence of other sub-district to this cell load factor, make to the situation of the different and same cell load real-time change of different districts load, all can correctly react the actual value of other sub-districts of dynamic change this area interference ratio.

Other sub-districts of expression of the present invention obtain through strict theoretical the C factor of this area interference effect, and are verified well in actual applications, have obtained actual effect.Provide the derivation of the C factor according to an embodiment of the invention below in detail.

In one embodiment of the invention, define this ascending load of cell factor and be,

${\mathrm{\η}}_{\mathrm{UL}}=\frac{I_{\mathrm{Total}}-P_N}{I_{\mathrm{Total}}}---\left(9\right)$

Wherein, η _ULBe this ascending load of cell factor, P _NBe background noise, I _TotalAccept the broadband gross power for the base station is up, promptly aforementioned RTWP value.Consider the interference gross effect of this sub-district and adjacent other sub-districts, the two parts that this ascending load of cell factor are divided into corresponding this sub-district and adjacent other sub-districts, wherein can be determined by target signal interference ratio, spreading rate and the service rate of the activation of service factor, customer service the contribution of the ascending load factor this sub-district according to aforementioned F factor method, therefore this ascending load of cell factor can be expressed as

${\mathrm{\η}}_{\mathrm{UL}}=\frac{I_{\mathrm{own}}+I_{\mathrm{other}}}{I_{\mathrm{Total}}}=\underset{j=1}{\overset{N}{\mathrm{\Σ}}}\frac{v_j}{1+\frac{J_j}{{\mathrm{\γ}}_j}}+\frac{I_{\mathrm{other}}}{I_{\mathrm{Total}}}---\left(10\right)$

Wherein, I _OwnBe this sub-district total received power, I _OtherBe the total disturbing effect of adjacent other sub-districts to the base station, J _jBe the target signal interference ratio of j customer service, promptly aforementioned (E _b/ N _o) _j, γ _jService rate R for aforementioned spreading rate W and j customer service _jRatio, the professional sum of this community user of N.

In the following formula, this sub-district can accurate Calculation obtain the contribution of the ascending load factor, and key is the calculating that other sub-districts are exerted an influence for this ascending load of cell factor.In a preferred embodiment of the present invention, physical mechanism from cell communication, derivation obtains the expression formula of all users of adjacent cell to total interference of this cell base station generation, thereby further accurately estimates the contribution of other sub-districts to this ascending load of cell factor.

Fig. 1 is that neighbor cell according to an embodiment of the invention produces the physical mechanism schematic diagram that disturbs to this sub-district.

Suppose that this sub-district is sub-district m, certain neighbor cell is sub-district s, the user of sub-district m self to the contribution of this ascending load of cell factor by I _Own ^mDetermine, the user of sub-district s to the contribution of this ascending load of cell factor by I _{Other, s} ^mDetermine that subscript is represented this value affiliated subdistrict here, subscript represents to produce the neighbor cell to other area interference of affiliated subdistrict.

According to the formula (10) of aforementioned this sub-district self disturbing effect, sub-district s total received power I _Own ^sBe expressed as,

$I_{\mathrm{own}}^s=I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}}---\left(11\right)$

Wherein, N _sBe the customer service sum of sub-district s, the subscript s of all the other parameters represents that this parameter affiliated subdistrict is sub-district s.

Same I _Own ^sAlso can be expressed as with the received power of all customer services among the s of sub-district,

$I_{\mathrm{own}}^s=\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}{P}_{\mathrm{RX},j}^s---\left(12\right)$

Consider that transmitting power is relevant with the path loss of Radio Link with received power, the path loss of establishing the Radio Link 101 between the base station of the customer service j of sub-district s and sub-district s is L _{J, s} ^s, wherein subscript is represented sub-district, customer service place, and subscript is represented the path loss of this loss for the base station from customer service j to sub-district s, and then formula (12) can be expressed as,

$I_{\mathrm{own}}^s=\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}{P}_{\mathrm{RX},j}^s=\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{P_{\mathrm{TX},j}^s}{L_{j,s}^s}---\left(13\right)$

P wherein _{RX, j} ^sAnd P _{TX, j} ^sBe respectively received power and the transmitting power of the customer service j of sub-district s.By formula (11) and formula (13), the transmitting power of the customer service j of sub-district s can be expressed as,

$P_{\mathrm{TX},j}^s=I_{\mathrm{Total}}^s\·L_{j,s}^s\·\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}}---\left(14\right)$

The customer service j that now considers sub-district s produces interference level at the place, base station of sub-district m, and the path loss of establishing Radio Link 102 between the base station of the customer service j of sub-district s and sub-district m earlier is L _{J, m} ^s, then the customer service j of sub-district s is expressed as at the interference level that the place, base station of sub-district m produces,

$I_{j,m}^s=I_{\mathrm{Total}}^s\·\frac{L_{j,s}^s}{L_{j,m}^s}\·\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}}---\left(15\right)$

Wherein, I _{J, m} ^sFor the customer service j of sub-district s the interference level that produces of place, base station.

All N among the s of sub-district _sIndividual customer service can be expressed as at total interference level that the place, base station of sub-district m produces,

$I_{\mathrm{other},s}^m=\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}{I}_{j,m}^s=I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{L_{j,s}^s}{L_{j,m}^s}\·\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}}---\left(16\right)$

In like manner, consider that m all neighbor cells in sub-district to the interference that sub-district m produces, are expressed as,

$I_{\mathrm{other}}^m=\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}{I}_{\mathrm{other},s}^m=\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}(I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{L_{j,s}^s}{L_{j,m}^s}\·\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}})---\left(17\right)$

Wherein, P _mFor what needs were considered sub-district m is produced the neighbor cell sum that disturbs.

So can obtain the ascending load factor of sub-district m be,

${\mathrm{\η}}_{\mathrm{UL}}^m=\frac{I_{\mathrm{own}}^m+I_{\mathrm{other}}^m}{I_{\mathrm{Total}}^m}=\underset{j=1}{\overset{N_m}{\mathrm{\Σ}}}\frac{v_j^m}{1+\frac{J_j^m}{{\mathrm{\γ}}_j^m}}+\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}(\frac{I_{\mathrm{Total}}^s}{I_{\mathrm{Total}}^m}\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{L_{j,s}^s}{L_{j,m}^s}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}})---\left(18\right)$

In one embodiment of the invention, consider in the real system, the relative position of cell base station and wireless link environment basic fixed thereof, therefore in the regular hour, neighbor cell customer service in the formula (18) satisfies the standard of static parameter substantially to the path loss of the Radio Link of this cell base station, therefore this static parameter is separated, and characterizes with parameter factors C, the ascending load factor expression that can obtain new sub-district m is

${\mathrm{\η}}_{\mathrm{UL}}^m=\underset{j=1}{\overset{N_m}{\mathrm{\Σ}}}\frac{v_j^m}{1+\frac{J_j^m}{{\mathrm{\γ}}_j^m}}+C_m\·\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}(\frac{I_{\mathrm{Total}}^s}{I_{\mathrm{Total}}^m}\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}})---\left(19\right)$

Wherein, parameter factors C _mThe neighbor cell that is used for representing sub-district m is expressed as the static part of the disturbing effect of this sub-district,

$C_m=\frac{\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}(I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{L_{j,s}^s}{L_{j,m}^s}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}})}{\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}(I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}})}---\left(20\right)$

Find out easily, in the C factor method of estimation, the ascending load of cell factor can be divided into two parts contribution and form, the load factor that first is produced for all the customer service phase mutual interference of this sub-district, i.e. total received power and the gross power decision of reception broadband that goes out in the base station by all customer services of this sub-district, second portion is the load factors that interference produced of all customer services of adjacent other sub-districts to this sub-district, the interference level decision that is produced at this cell base station place by the customer service of every other sub-district.

The interference that this sub-district is produced according to aforementioned other sub-districts as can be known is dynamic change along with the load variations of the difference of sub-district and same sub-district, in one embodiment of the invention, with aforementioned second portion, other sub-districts of i.e. this dynamic change are to the interference of this sub-district, be expressed as static and dynamic two-part product, wherein static part is by the physical location between the sub-district, wireless channel and the statistical property decision of user distribution relatively, can be approximated to be constant parameter, C represents with parameter factors; And dynamic part is determined by other cell load factors and other cell uplink total received powers RTWP value, reflect the dynamic change of each cell radio resource, it is a dynamic parameter, by the estimation of dynamic part, can count the motion-change effect of other sub-districts accurately to this area interference.

In real system, need carry out the parameter that dynamic monitoring could obtain dynamic part to each sub-district.In one embodiment of the invention, all sub-districts are earlier by measuring resultant self total received power and measured value such as RTWP, then for certain sub-district, utilize the total received power measured value information of neighbor cell and the total received power measured value information of self, represented other sub-districts are to the dynamic part parameter of this area interference in the calculating formula (19), and the C factor of the sign static part parameter of setting, can obtain total adjacent area disturbing effect, thereby calculate the ascending load factor of this sub-district.

In one embodiment of the invention, the state information amount T of definition sub-district m self _mFor,

$T_m=I_{\mathrm{Total}}^m\·\underset{j=1}{\overset{N_m}{\mathrm{\Σ}}}\frac{v_j^m}{1+\frac{J_j^m}{{\mathrm{\γ}}_j^m}}---\left(21\right)$

State information amount T as can be seen _mBe aforementioned sub-district total received power I _Own ^m, in the load factor that interference produced of estimating sub-district self, can measure the state information amount T of each sub-district _mSo according to the state information amount of each sub-district, can be calculated the ascending load factor of each sub-district by formula (19), after showing with the state information scale, formula (19) can be rewritten as,

${\mathrm{\η}}_{\mathrm{UL}}^m=(1+\frac{C_m\·\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}{T}_s}{T_m})\·\frac{T_m}{I_{\mathrm{Total}}^m}=(1+F)\·\frac{T_m}{I_{\mathrm{Total}}^m}=(1+F)\·{\mathrm{\η}}_{\mathrm{ULo}}^m---\left(22\right)$

$F=\frac{C_m\·\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}{T}_s}{T_m}---\left(23\right)$

${\mathrm{\η}}_{\mathrm{ULo}}^m=\underset{j=1}{\overset{N}{\mathrm{\Σ}}}\frac{v_j}{1+\frac{J_j}{{\mathrm{\γ}}_j}}---\left(24\right)$

Wherein, η _ULo ^mBe the ascending load factor that sub-district m self disturbs, F be other sub-districts to this area interference ratio, be the proportion that other sub-districts is disturbed by this area interference and this sub-district self in formula (22) bracket and concern.

Those of ordinary skill in the art are appreciated that, in the above-mentioned formula, the cell status information amount also can be represented by the measured value of other parameters, making uses the same method can estimate the relative interference ratio of other sub-districts to this sub-district, thereby obtain accurate ascending load factor estimated value, and do not influence the spirit and scope of the invention.

As seen, C factor method estimates that the ascending load factor of sub-district only needs each sub-district to carry out the oneself state amount of information and measures, and utilizes the C factor of setting then, calculates the ascending load factor according to formula (22).By utilizing the state information amount of other sub-districts, can the equivalence the actual parameter that obtains other sub-districts, is an amount along with the actual conditions dynamic change according to these other sub-districts that obtain to the interference ratio of this sub-district, can follow the tracks of well in the real system, the variation that each cell radio resource distributes, the ascending load estimated value that obtains is more accurate.Simultaneously, C factor method has adopted the ratio and the static parameter factor C of the state information amount of other sub-districts and this sub-district to calculate the ratio of other sub-districts to this area interference, can avoid the static shift error of the absolute measured value of each sub-district total received power so effectively, because the equivalent environment Temperature Influence is all received in this sub-district and adjacent other sub-districts within the specific limits, therefore the static receiver error that produces is suitable substantially, and the C factorization method is utilized the relative measurement ratio between the sub-district, just in time avoid the error of static shift generation, thereby further improved the evaluated error of the ascending load factor.

According to aforementioned C factor method derivation, Fig. 2 shows ascending load factor method of estimation flow chart according to an embodiment of the invention.

Then enter step 201, obtain the static parameter factor on the statistical significance of this sub-district by simulation calculation or experiment measuring, computing formula is as (20).Carry out emulation such as simulation softwares such as can adopting MATLAB, perhaps carry out field survey, obtain the C factor of statistical average the real cell signal intelligence.

Then enter step 202, in the communication process, each sub-district is measured the total received power value of self in real time.Because the present invention adopts the relative measurement value, so this measurement allows the static shift error.

Then enter step 203, calculate the interference ratio of other sub-districts to this sub-district according to the static parameter factor that obtains in the total received power value of the total received power value of this sub-district that measures in the step 202 and other sub-districts and the step 201, computing formula is suc as formula (23).

Then enter step 204, calculate the ascending load factor that disturb this sub-district self, suc as formula (7).

Then enter step 205, according to the interference ratio of other sub-districts that calculate in the step 203 to this sub-district, and the ascending load factor disturbed of this sub-district self of obtaining of step 204, calculating the ascending load factor of this sub-district, computing formula is suc as formula (22).Here the computational methods of the interference ratio of this sub-district self can be that existing reception total power value and RTWP value according to this sub-district calculates, suc as formula (22).

Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.

Claims (10)

1. ascending load method of estimation in the mobile communication system is characterized in that, comprises following steps,

A sets this sub-district static parameter factor;

B is according to the ratio of the state information amount of the state information amount of this sub-district and other sub-districts, and described this sub-district static parameter factor, calculates other sub-districts to this area interference ratio;

C calculates this ascending load of cell factor according to the ascending load factor of described other sub-districts to this area interference ratio and this sub-district self interference;

Wherein, described this sub-district static parameter factor be used for indicating described other sub-districts to this area interference than changing static constant part along with allocation of radio resources, the ratio of the state information amount of described this sub-district and the state information amount of other sub-districts be used for indicating described other sub-districts to this area interference than along with allocation of radio resources changes and the part of dynamic change.

2. ascending load method of estimation in the mobile communication system according to claim 1 is characterized in that, described ascending load method of estimation is applied in the access control or load control of the base station in the WCDMA mobile communication system.

3. ascending load method of estimation in the mobile communication system according to claim 1 is characterized in that, in the described steps A, the setting of described this sub-district static parameter factor is carried out according to emulation or result of experiment.

4. ascending load method of estimation in the mobile communication system according to claim 1 is characterized in that, the Tm of state information amount described in the described step B calculates according to following formula:

$T_m=I_{\mathrm{Total}}^m\·\underset{j=1}{\overset{N_m}{\mathrm{\Σ}}}\frac{v_j^m}{1+\frac{J_j^m}{{\mathrm{\γ}}_j^m}}$

I wherein _Total ^mBe the reception broadband gross power of sub-district, J _j ^mBe the target signal interference ratio of j customer service in the sub-district, γ _j ^mBe the ratio of the service rate of spreading rate in the sub-district and j customer service, v _j ^mBe the activation of service factor of j customer service in the sub-district, N _mBe the customer service number in the sub-district.

5. ascending load method of estimation in the mobile communication system according to claim 1 is characterized in that, this sub-district static parameter factor obtains by the statistical average to following formula described in the described steps A:

$C_m=\frac{\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}\left(I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{L_{j,s}^s}{L_{j,m}^s}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}}\right)}{\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}(I_{\mathrm{Total}}^s\·\underset{j=1}{\overset{N_s}{\mathrm{\Σ}}}\frac{v_j^s}{1+\frac{J_j^s}{{\mathrm{\γ}}_j^s}})}$

Wherein, C _mBe described this sub-district static parameter factor, P _mBe the number of described other sub-districts, I _Total ^sBe the reception broadband gross power of s other sub-districts, N _sBe the customer service number in described s other sub-districts, l _{J, s} ^sBe the path loss of the Radio Link between the base station of j customer service in described s other sub-districts and described s other sub-districts, L _{J, m} ^sBe the path loss of Radio Link between the base station of j customer service in described s other sub-districts and described this sub-district, J _j ^sBe the target signal interference ratio of j customer service in described s other sub-districts, γ _j ^sBe the ratio of the service rate of spreading rate in described s other sub-districts and j customer service, v _j ^sThe activation of service factor for j customer service in described s other sub-districts.

6. ascending load method of estimation in the mobile communication system according to claim 1 is characterized in that step B comprises following substep,

B1 measures the absolute measured value of the state information amount of the absolute measured value of state information amount of described this sub-district and described other sub-districts;

B2 is obtained the ratio of the state information amount of the state information amount of described this sub-district and other sub-districts by the ratio of the absolute measured value sum of the state information amount of the absolute measured value of the state information amount of described this sub-district and all described other sub-districts;

B3 obtains described other sub-districts to this area interference ratio by the static parameter factor that the ratio of the state information amount of the state information amount of described this sub-district and other sub-districts multiply by described this sub-district.

7. ascending load method of estimation in the mobile communication system according to claim 6 is characterized in that, other sub-districts calculate according to following formula this area interference beguine described in the described step B:

$F=\frac{C_m\·\underset{s=1}{\overset{P_m}{\mathrm{\Σ}}}{T}_s}{T_m}$

Wherein, F is that described other sub-districts are to this area interference ratio, C _mBe described this sub-district static parameter factor, T _mThe absolute measured value of described cell status information amount, T _sBe the absolute measured value of described s other cell status information amounts, P _mNumber for described other sub-districts.

8. ascending load method of estimation in the mobile communication system according to claim 1 is characterized in that, the ascending load factor that disturb this sub-district described in the described step C self calculates according to following formula:

${\mathrm{\η}}_{\mathrm{ULo}}^m=\underset{j=1}{\overset{N}{\mathrm{\Σ}}}\frac{v_j}{1+\frac{J_j}{{\mathrm{\γ}}_j}}$

Wherein, η _ULo ^mBe the ascending load factor that disturb described sub-district self, J _jBe the target signal interference ratio of j customer service in this sub-district, γ _jBe the ratio of the service rate of spreading rate in described this sub-district and j customer service, v _jBe the activation of service factor of j customer service in described this sub-district, customer service number in described this sub-district of N.

9. according to ascending load method of estimation in claim 7 or the 8 described mobile communication system, it is characterized in that this ascending load of cell factor calculates according to following formula described in the described step C:

${\mathrm{\η}}_{\mathrm{UL}}^m=(1+F)\·{\mathrm{\η}}_{\mathrm{ULo}}^m$

Wherein, F is that described other sub-districts are to this area interference ratio, η _ULo ^mThe ascending load factor for described sub-district self interference.

10. ascending load method of estimation in the mobile communication system according to claim 1 is characterized in that, described other sub-districts can only comprise the adjacent cell of described this sub-district.

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