CN101141184B - Method, device and system for predicting forward reachable velocity of honeycomb cell - Google Patents

Abstract

Translated fromChinese

本发明提供了一种蜂窝小区前向可达速率的预测方法、装置及系统，包括：将蜂窝小区分为小区内部和边缘，根据邻区干扰因子和与信噪比相关的设计目标因素预算出小区边缘前向可达速率，根据所述小区边缘前向可达速率，进一步预测小区内部前向可达速率，本发明充分、正确地考虑邻区干扰和前向速率所要求信噪比之间的关系，明确区别小区边缘与小区内部链路预算的差异，为EVDO前向覆盖规划提供了基础，也可直接应用于网络覆盖仿真的实现。

The present invention provides a method, device and system for predicting the forward attainable rate of a cellular cell, which includes: dividing the cellular cell into the interior and the edge of the cell, and calculating the rate according to the interference factor of the adjacent cell and the design target factor related to the signal-to-noise ratio. The forward reachable rate at the edge of the cell, according to the forward reachable rate at the edge of the cell, further predicts the forward reachable rate inside the cell. The relationship between cell edge and cell internal link budget is clearly distinguished, which provides a basis for EVDO forward coverage planning, and can also be directly applied to the realization of network coverage simulation.

Description

A kind of Forecasting Methodology of forward reachable velocity of honeycomb cell, Apparatus and system

Technical field

The present invention relates to the coverage planning of cordless communication network; Particularly, also can be generalized to the fixing wireless communication system of other forward emitting powers relevant for cdma2000 1xEV-DO system (hereinafter to be referred as the EVDO system) cellular cell edge and inner forward reachable velocity Forecasting Methodology.

Background technology

In cellular radio communication network, the geographical distribution of the forward service rate of embedded sub-district is with relevant with the adjacent cell distribution from this base station distance; Like Fig. 1; The sub-district speed that can be divided into the A place is cell edge speed, and the sub-district speed at B, C place is the sub-district internal rate, and wherein the sub-district internal rate is divided into multiple again; Usually near more apart from this base station, achievable rate is high more.Estimation to the cell edge achievable rate generally realizes through link budget.Industry has had the isolated island or (the Evolution Data Only of the EVDO under the cellular environment of comparative maturity; Data transfer optimization) reverse link budget; With the EVDO forward link budget under the isolated island environment, but lack effectively, the forward link budget under the cellular environment of comparative maturity.In the at present visible publication and reference, though relevant argumentation is arranged, the following problem of ubiquity:

1. fail fully, correctly to consider that disturb the adjacent area and forward direction speed requires the relation between the signal to noise ratio, fail to point out that higher forward direction speed can not realize at cell edge, and reason;

2. fail clearly to distinguish the difference of cell edge and sub-district inner link budget, often both are lumped together.

Therefore, the budget result of existing visible publication fails correctly to reflect actual conditions, differs greatly with the real network test result, is badly in need of proposing correct, effective method and instructs commercial network planning and build.

The geographical prediction of forward direction speed is closely related with the basic fundamental characteristics of EVDO forward link, and its characteristics mainly show:

1. forward direction full power emission, transmitting power is fixed;

2. time division multiplexing between the user, thereby by the target of base station scheduling algorithm decision time slot service---multi-user diversity gain produced;

3. the switching of the forward direction between the sub-district is a virtual soft, and it is service-data oriented to have only a sub-district to send to the user, is not soft handover---virtual soft gains less than soft handover gain;

4. user terminal has the branch of single antenna terminal and dual-antenna terminal, thereby dual-antenna terminal is lower than single antenna terminal to the requirement of demodulation threshold---produced the diversity reception gain;

Below all are differences of EVDO system and traditional cdma2000 1x system, determined that also the forward link budget of two kinds of systems is different.

Under the cellular environment, a main difficult point of forward link prediction is that adjacent cell signal power is to the interference of this cell signal power.Under cellular environment, the adjacent area interference of embedded cell edge is very strong, often greater than the signal power of this sub-district.Yet; Can know that from reality test and 3GPP2 minimum sandards the middle and high speed of DO forward direction is to having relatively high expectations of terminal received signal to noise ratio (claiming demodulation threshold again); For example under the wireless fading channel environment, the frequency spectrum density signal to noise ratio of 1.8Mbps rate requirement can reach more than the 20dB.Therefore, at embedded cell edge, higher forward service rate can't realize having only lower speed to realize, that is to say, at cell edge, has only the link budget of low service rate just meaningful.

As technological difficulties, the situation expansion of the adjacent area interference in embedded sub-district is introduced as follows.When covering for honeycomb, the equal Approximate Equivalent of omni cell is a regular hexagon, sees Fig. 2, supposes that this periphery, sub-district has only two-layer honeycomb, and center of housing estate is R to the radius on regular hexagon summit_c, the center is R to the radius on regular hexagon limit, then hasIf the terminal is positioned at the bullet place, then adjacent sub-district disturbs situation as shown in Figure 2 to the forward direction at terminal.Adjacent in the case area interference intensity is calculated more complicated; All sub-districts are to the interference at terminal around need considering strictly speaking; But the effect near two circle sub-districts of this sub-district is main, and the interference of farther sub-district can be ignored because of path loss is big, interference power is less relatively.The ratio that defines adjacent area interference and this cell signal power is β, and there is relation at adjacent area interference and terminal at the position feature r of this sub-district (with the distance of this base station), θ (with the angle of this base station assigned direction), for example work as r=0.8R_c, path loss index γ=4 o'clock, when θ changed, β will be in [1.7dB ,-0.9dB] interval fluctuation, and visible β is little with the amplitude that θ changes; When r approached cell edge, β can increase sharply, and as r during to the sub-district internal contraction, β can reduce rapidly.

For ease of overall observation, Fig. 3 has represented that at different path loss index γ, terminal relative position in the sub-district is (with normalization apart from r/R_cWhen indication) changing, the curve of the peak change of β, the peak value of β are equivalent to consider the higher situation of β when θ changes, and therefore θ is no longer mentioned in the back.Because of orthohexagonal characteristics, get r=0.9R_cRadius as the sub-district is suitable, and according to the argumentation of Fig. 3 and other lists of references, when path loss index γ=3.5 or 4, the General Definition cell edge is r=0.9R_c, the β ≈ 2.5dB of cell edge.

In addition; The important parameter of EVDO forward link budget " virtual soft gain "; Be the terminal independently selects contiguous optimum sub-district to produce for its service in the switch area gain, also with the sub-district in geographical distribution closely related, gain maximum when the terminal is positioned at cell edge; About 2.2dB, when the terminal reduces rapidly to 0 convergence when move inside, sub-district.At present, do not see the corresponding theoretical result of relative position in accurate " virtual soft gain " and the sub-district temporarily.

Summary of the invention

For addressing the above problem; The object of the present invention is to provide a kind of forward reachable velocity of honeycomb cell forecast method, Apparatus and system; Solving the problem of distinguishing cell edge and sub-district inner link variation from budget of failing in the forward link budget under the existing cellular environment, for the coverage planning and the emulation of coverage capability of EVDO wireless cellular network provides foundation.

For realizing above-mentioned purpose; The invention provides a kind of Forecasting Methodology of forward reachable velocity of honeycomb cell, wherein, comprising: cellular cell is divided into inside, sub-district and edge; Go out the cell edge forward reachable velocity according to the adjacent area interference factor with the design object factor budget relevant with signal to noise ratio; According to said cell edge forward reachable velocity, further predict the inner forward reachable velocity in sub-district, specifically may further comprise the steps:

Step 1; Needs according to a plurality of design object factors relevant with signal to noise ratio; Comprehensive snr value is set; Calculate the required comprehensive snr value of various cellular cells edge forward direction speed,, confirm cellular cell edge forward reachable velocity according to the relation of said comprehensive snr value and adjacent area interference factor;

Step 2 according to said cellular cell edge forward reachable velocity, is set cell edge speed; According to the normalization distance of inside, sub-district assigned address, obtain the gain of the adjacent area interference factor and virtual soft, carry out the link budget of cellular cell; Obtain the covering radius of various forward direction speed; The normalization distance of the said covering radius correspondence that converts is selected flank speed, as the forward reachable velocity of inside, sub-district assigned address in the speed of the normalization distance that is not less than former setting;

Wherein, said comprehensive snr value_DBThe default demodulation thresholding of=single antenna_DB+ fading margin_DBThe gain of-virtual soft_DBThe gain of-receive diversity_DBAnd/or multi-user diversity gain_DB, wherein receive diversity gain, multi-user diversity gain are option;

Said adjacent area interference factor=adjacent area interference power/this cell power of reception;

Saidstep 1 further comprises:

Judge whether said cell edge forward direction speed required comprehensive snr value and adjacent area interference factor meet following relation:

Receive this cell power/(adjacent area interference factor * this cell power of reception+thermal noise) >=comprehensive noise

Ratio; Or

Comprehensive snr value_(dB)＜-adjacent area interference factor_(dB)

If meet, then be cellular cell edge forward reachable velocity;

Said step 2 further comprises:

Step 21, selected a kind of according to said cell edge forward reachable velocity, carry out the link budget of cellular cell, confirm the cellular cell radius;

Step 22, the relative position of setting terminal in said cellular cell represented said relative position with the normalization distance, and sets communication probability;

Step 23; According to normalization distance and propagated loss index, search the corresponding relation of adjacent area interference factor and normalization distance, obtain the corresponding adjacent area interference factor; Search the corresponding relation of virtual soft gain and normalization distance table, obtain the corresponding virtual soft handover gain;

Step 24 according to the said adjacent area interference factor and virtual soft gain, is carried out the inner link budget of cellular cell, obtains the covering radius of various forward direction speed;

Step 25, the corresponding normalization distance of said various forward direction speed covering radius that converts is selected flank speed, as the forward reachable velocity of inside, sub-district assigned address in the speed of the normalization distance that is not less than former setting.

For realizing above-mentioned purpose, the present invention also provides a kind of prediction unit of forward reachable velocity of honeycomb cell, is applicable to the wireless communication system that forward emitting power is fixing, wherein, comprising:

One cell edge achievable rate prediction module; The needs that are used for the basis a plurality of design object factors relevant with signal to noise ratio; Comprehensive snr value is set; Calculate the required comprehensive signal to noise ratio of various cellular cells edge forward direction speed,, confirm cellular cell edge forward reachable velocity according to the relation of said comprehensive snr value and adjacent area interference factor;

The inner achievable rate prediction module in one sub-district; Be used for according to said cellular cell edge forward reachable velocity, set cell edge speed, according to the normalization distance of inside, sub-district assigned address; Obtain the gain of the adjacent area interference factor and virtual soft; Carry out the link budget of cellular cell, obtain the covering radius of various forward direction speed, the corresponding normalization distance of said covering radius converts; In the speed of the normalization distance that is not less than former setting, select flank speed, as the forward reachable velocity of inside, sub-district assigned address;

Wherein, said comprehensive snr value_DBThe default demodulation thresholding of=single antenna_DB+ fading margin_DBThe gain of-virtual soft_DBThe gain of-receive diversity_DBAnd/or multi-user diversity gain_DB

Said adjacent area interference factor=adjacent area interference power/this cell power of reception;

Said cell edge achievable rate prediction module is further used for, and judges whether said cell edge forward direction speed required comprehensive snr value and adjacent area interference factor meet following relation:

Receive this cell power/(adjacent area interference factor * this cell power of reception+thermal noise) >=comprehensive snr value; Or

Comprehensive snr value_(dB)＜-adjacent area interference factor_(dB)

If meet, then be cellular cell edge forward reachable velocity;

The inner achievable rate prediction module in said sub-district further comprises:

One radius determination module is used for carrying out the link budget of cellular cell according to said cell edge forward reachable velocity, confirms the cellular cell radius;

One terminal location determination module is used for the relative position of setting terminal in cellular cell, with normalization distance " with diagonal angle, base station distance r/ sub-district radius R_c" represent said relative position, and set communication probability;

One parameter determination module; Be used for according to normalization distance and propagated loss index; Search the corresponding relation of adjacent area interference factor and normalization distance; Obtain the corresponding adjacent area interference factor, search the corresponding relation of virtual soft gain and normalization distance table, obtain the corresponding virtual soft handover gain;

One covering radius determination module is used for carrying out the link budget of cellular cell according to the said adjacent area interference factor and virtual soft gain, obtains the covering radius of various forward direction speed; With

One speed determination module, the normalization distance that the covering radius of each speed that is used to convert is corresponding is with the flank speed in the covering radius rate corresponding that is not less than the normalization distance that presets, as the forward reachable velocity of inside, sub-district assigned address.

The prediction unit of above-mentioned forward reachable velocity of honeycomb cell, wherein, said wireless communication system further comprises: CDMA2000 1XEV-DO system.

Be to realize above-mentioned purpose, the present invention also provides a kind of prognoses system of forward reachable velocity of honeycomb cell, is arranged in the base station, is used for predicting the forward reachable velocity of the portable terminal of cellular cell, it is characterized in that, comprising:

One cell edge achievable rate prediction module; The needs that are used for the basis a plurality of design object factors relevant with signal to noise ratio; Comprehensive snr value is set; Calculate the required comprehensive snr value of various cellular cells edge forward direction speed,, confirm cellular cell edge forward reachable velocity according to the relation of said comprehensive snr value and adjacent area interference factor;

The inner achievable rate prediction module in one sub-district; Be used for according to said cellular cell edge forward reachable velocity, set cell edge speed, according to the normalization distance of inside, sub-district assigned address; Obtain the gain of the adjacent area interference factor and virtual soft; Carry out the link budget of cellular cell, obtain the covering radius of various forward direction speed, the corresponding normalization distance of said covering radius converts; In the speed of the normalization distance that is not less than former setting, select flank speed, as the forward reachable velocity of inside, sub-district assigned address;

Wherein, said comprehensive snr value_DBThe default demodulation thresholding of=single antenna_DB+ fading margin_DBThe gain of-virtual soft_DBThe gain of-receive diversity_DBAnd/or multi-user diversity gain_DB

Said adjacent area interference factor=adjacent area interference power/this cell power of reception;

Said cell edge achievable rate prediction module is further used for, and judges whether said cell edge forward direction speed required comprehensive snr value and adjacent area interference factor meet following relation:

Receive this cell power/(adjacent area interference factor * this cell power of reception+thermal noise) >=comprehensive snr value; Or

Comprehensive snr value_(dB)＜-adjacent area interference factor_(dB)

If meet, then be cellular cell edge forward reachable velocity; The inner achievable rate prediction module in said sub-district further comprises:

One radius determination module is used for carrying out the link budget of cellular cell according to said cell edge forward reachable velocity, confirms the cellular cell radius;

One terminal location determination module is used for the relative position of setting terminal in cellular cell, with normalization distance " with diagonal angle, base station distance r/ sub-district radius R_c" represent said relative position, and set communication probability;

One parameter determination module; Be used for according to normalization distance and propagated loss index; Search the corresponding relation of adjacent area interference factor and normalization distance; Obtain the corresponding adjacent area interference factor, search the corresponding relation of virtual soft gain and normalization distance table, obtain the corresponding virtual soft handover gain;

One covering radius determination module is used for carrying out the link budget of cellular cell according to the said adjacent area interference factor and virtual soft gain, obtains the covering radius of various forward direction speed; With

One speed determination module, the normalization distance that the covering radius of each speed that is used to convert is corresponding is with the flank speed in the covering radius rate corresponding that is not less than the normalization distance that presets, as the forward reachable velocity of inside, sub-district assigned address.

The Forecasting Methodology of a kind of forward reachable velocity of honeycomb cell provided by the invention, Apparatus and system, all measurable from the cell edge to inside, embodied the essential characteristic of EVDO system forward link and cellular network, be the method for relatively pressing close to reality.The present invention provides the foundation for EVDO forward direction coverage planning, also can directly apply to the realization of network coverage simulation.

Description of drawings

Fig. 1 is cellular cell edge and inner achievable rate sketch map;

Fig. 2 is an adjacent area interference sketch map under the cellular environment;

Fig. 3 is cellular cell adjacent area interference factor peak value and sub-district normalization distance relation figure;

Fig. 4 is the structural representation of testing apparatus of the present invention;

Fig. 5 is the structural representation of the inner achievable rate prediction module in sub-district of the present invention.

Embodiment

As shown in Figure 4; The invention provides a kind oftesting apparatus 100 of forward reachable velocity of honeycomb cell; Be applicable to cdma2000 1xEV-DO system (hereinafter to be referred as the EVDO system), comprise: cell edge forward reachablevelocity prediction module 110 and the inner forward reachablevelocity prediction module 120 in sub-district.Wherein, Cell edge forwardreachable velocity module 110 is used for the needs of the basis a plurality of design object factors relevant with signal to noise ratio; Comprehensive snr value Y is set; Calculate the required comprehensive snr value Y of various cellular cells edge forward direction speed,, confirm cellular cell edge forward reachable velocity according to the relation of this comprehensive snr value Y and adjacent area interference factor β; The inner forward reachablevelocity prediction module 120 in sub-district is used for according to this cellular cell edge forward reachable velocity; Obtain the gain of the adjacent area interference factor and virtual soft; Carry out the link budget of cellular cell, obtain the covering radius of the inner forward direction speed in various sub-districts, the corresponding normalization distance of this covering radius converts; In the speed of the normalization distance that is not less than former setting, select flank speed, as inside, sub-district forward reachable velocity.

Wherein, as shown in Figure 5, the inner forward reachable velocity prediction module 120 in sub-district further comprises: radius determination module 121, terminal location determination module 122, parameter determination module 123, covering radius determination module 124 and speed determination module 125.Radius determination module 121 is used for carrying out the link budget of cellular cell according to this cell edge forward reachable velocity, confirms the cellular cell radius; Terminal location determination module 122 is used for the relative position of setting terminal in cellular cell, with normalization distance " with diagonal angle, base station distance r/ sub-district radius R_c" represent this relative position, and set communication probability; Parameter determination module 123 is used for according to normalization distance and propagated loss index; Search the corresponding relation of adjacent area interference factor and normalization distance; Obtain the corresponding adjacent area interference factor; Search the corresponding relation of virtual soft gain and normalization distance table, obtain the corresponding virtual soft handover gain; Covering radius determination module 124 is used for carrying out the link budget of cellular cell according to this neighbour's area interference factor and virtual soft gain, obtains the covering radius of the inner forward direction speed of various cellular cells; With speed determination module 125 be used to the to convert corresponding normalization distance of covering radius of each speed, with the flank speed in the covering radius rate corresponding that is not less than the normalization distance that presets, as inside, sub-district forward reachable velocity.

Utilize theprediction unit 100 of this forward reachable velocity of honeycomb cell; Can set up a kind of prognoses system,prediction unit 100 is arranged in the base station, with each portable terminal in the sub-district; Constitute a cover prognoses system, for the coverage planning and the emulation of coverage capability of EVDO wireless cellular network provides foundation.

The present invention also provides the Forecasting Methodology of forward reachable velocity of honeycomb cell, and this method is divided into two parts:

First is prediction cellular cell edge forward reachable velocity, wherein, comprising:

The signal to noise ratio of cell edge must meet the planning and designing target, must satisfy the requirement of destinations traffic probability, the various gains of designated environment and allowance, promptly satisfies the following formula requirement:

[receiving this cell power/(adjacent area interference power+thermal noise)]_DBThe default demodulation thresholding of>=single antenna_DB+ fading margin_DBThe gain of-virtual soft_DBThe gain of-receive diversity_DB-multi-user gain_DB=Y 1.

Wherein, Y is the middle transition variable, has embodied the general requirements of various gain/allowances that terminal demodulates thresholding and design objective cause, and abbreviates comprehensive signal to noise ratio as.Wherein, receive diversity gain and multi-user's gain are options.Since at cell edge, the doubly relation of (adjacent area interference factor) of β is arranged between adjacent area interference power and this cell power, so 1. formula can be written as again:

③

Can be converted into

(1-Y * β) * receive this cell power >=Y * thermal noise 4.

For guaranteeing that following formula is of practical significance, the left side is necessary for positive number, so there is following formula to set up

$Y<\frac{1}{\mathrm{\&beta;}}$⑤

If with dB is unit, then show as 2. formula:

Comprehensive snr value_(dB)＜-adjacent area interference factor_(dB)2.

Under the honeycomb condition, cell edge must satisfy 5. formula or 2. formula, and pairing forward direction speed, communication probability target could realize.

Forward link budget form with certain frequency range is the example explanation below.Suppose: at cell edge, adjacent area interference factor β is 2.5dB; The virtual soft gain is 2.2dB; The desired demodulation threshold such as table 1 parameter S of certain wireless fading channel type, single antenna terminal, satisfied 2% Packet Error Ratio; Simultaneously base station radio essential information such as known base station transmitting power, antenna gain and environmental index, wireless design index then can reach service rate through forward link budget form prediction cell edge.

The forward link budget example (single antenna terminal) of the embedded cell edge of table 1 cellular environment

In table 1, the Y value of having listed 38.4k, 76.8k and three kinds of speed of 153.6kbps is respectively-5.8dB ,-3.8dB and 0.2dB, the Y value of having only 38.4k, 76.8kbps less than-β (promptly-2.5dB).So when communication probability was 75%, the cell edge forward direction can realize that speed has only 38.4k or 76.8kbps, high again speed can't obtain, so table 1 is not listed the speed higher than 153.6kbps.Unappeasable speed is presented as that in table 1 " the minimum received power in terminal " is invalid, causes " the maximum path loss that allows " parameter also invalid.

When the terminal is dual-antenna terminal, will there be the advantage of diversity gain at the terminal, and the often comparable single antenna terminal of forward reachable velocity improves one-level, and this slightly.

Second portion is the inner forward reachable velocity of prediction cellular cell, wherein, when the terminal when cellular cell is inner, situation both had been different from the isolated island sector, also was different from the cellular cell edge.In this case; Two important parameter values of forward link budget---adjacent area interference intensity and virtual soft gain depend on the relative geographical position of terminal in the sub-district; Promptly with the normalization distance of base station; Normalization is apart from difference, and above-mentioned two parameter values are just different, and amplitude of variation maybe be bigger.Wherein, specifically comprise:

Step 1. is earlier by the said method of first; Confirm the forward direction speed that cell edge need be realized; Be the cell edge forward reachable velocity,radius determination module 121 carries out the link budget of cellular cell according to the cell edge forward reachable velocity, confirms the cellular cell radius.

Suppose that cell edge only need realize 38.4kbps, according to the result of table 1, proceed the covering radius budget, suppose at general urban area circumstance, propagation model adopts Hata model commonly used, and the result sees table 2.

Table 2 covering radius budget example

38.4kbps covering radius R=3.47km, if press regular hexagon standard topology structure, then the diagonal radius is R_c=R/0.9=3.86km is as radius of society.

The relative position of step 2. terminallocation determination module 122 setting terminals in cellular cell, with normalization distance " with diagonal angle, base station distance r/ sub-district radius R_c" expression; Set communication probability.

Suppose to predict that place normalization is apart from r/R in the sub-district_cThe achievable rate at=0.6 place is established communication probability=75%.

Step 3.parameter determination module 123 is according to normalization distance and propagated loss index; Look into " adjacent area interference factor vs normalization distance " figure and obtain the corresponding adjacent area interference factor, look into " virtual soft gain vs normalization distance table " and obtain the corresponding virtual soft handover gain.

According to normalization distance=0.6, the propagated loss index ≈ 3.5 of common Hata model looks into Fig. 3, gets adjacent area interference factor peak value ≈-6dB.Suppose that the virtual soft gain is as shown in table 3 with the relation of normalization distance, then obtain the virtual soft gain and be 0dB.Need to prove that≤0.8 pairing virtual soft gain of normalization distance is default in the table 3, exact value is still needed and is sought authority's achievement in research.

Gain of table 3 virtual soft and normalization distance relation example

Step 4. coveringradius determination module 124 utilizes above parameter, carries out the link budget of cellular cell, draws the covering radius of each speed.

The result sees table 4, has only three kinds of speed such as 38.4k, 76.8k and 153.6kbps to be candidate's speed in the cards, because the demodulation threshold of 307.2kbps rate requirement is higher, still can not realize.The most beneath delegation of table 4 is seen in the covering radius prediction of three kinds of candidate's speed.

The inner forward link budget example (single antenna terminal) in the embedded sub-district of table 4 cellular environment

The step 5.speed determination module 125 corresponding normalization distance of each service rate covering radius that converts is not less than the flank speed of the normalization distance of former setting, is that this relative position satisfies the attainable forward direction flank speed of designated communication probability.

The conversion result sees table 5, and the normalization that three kinds of coverings of having only 38.4k and two kinds of speed of 76.8kbps among maybe speed can be not less than setting is apart from 0.6, so 76.8kbps satisfies the attainable forward direction flank speed of design objective at assigned address.

The normalization distance of each speed covering radius of table 5

Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (4)

Translated fromChinese

1.一种蜂窝小区前向可达速率的预测方法，其特征在于，包括：将蜂窝小区分为小区内部和边缘，根据邻区干扰因子和与信噪比相关的设计目标因素预算出小区边缘前向可达速率，根据所述小区边缘前向可达速率，进一步预测小区内部前向可达速率，具体包括以下步骤：1. A method for predicting the forward reachable rate of a cellular cell, characterized in that, comprising: dividing the cellular cell into cell interiors and edges, budgeting cell edges according to adjacent cell interference factors and design target factors related to signal-to-noise ratio The forward reachable rate, according to the forward reachable rate at the edge of the cell, further predicts the forward reachable rate inside the cell, specifically including the following steps:步骤1，根据与信噪比相关的多个设计目标因素的需要，设置综合信噪比值，计算各种蜂窝小区边缘前向速率所需的综合信噪比值，根据所述综合信噪比值和邻区干扰因子的关系，确认蜂窝小区边缘前向可达速率；Step 1, according to the needs of multiple design target factors related to SNR, set the comprehensive SNR value, calculate the required comprehensive SNR value of various cell edge forward rates, according to the comprehensive SNR The relationship between the value and the interference factor of the adjacent cell, and confirm the forward reachable rate of the cell edge;步骤2，根据所述蜂窝小区边缘前向可达速率，设定小区边缘速率，根据小区内部指定位置的归一化距离，获取邻小区干扰因子和虚拟软切换增益，进行蜂窝小区的链路预算，得到各种前向速率的覆盖半径，换算所述覆盖半径对应的归一化距离，在不小于原设定的归一化距离的速率中选择最高速率，作为小区内部指定位置的前向可达速率；Step 2: Set the cell edge rate according to the forward reachable rate at the edge of the cell, and obtain the interference factor of the adjacent cell and the virtual soft handover gain according to the normalized distance of the specified position inside the cell, and perform the link budget of the cell , get the coverage radius of various forward rates, convert the normalized distance corresponding to the coverage radius, select the highest rate among the rates not less than the original set normalized distance, and use it as the forward available rate of the designated location inside the cell up to speed;其中，所述综合信噪比值_dB＝单天线的缺省解调门限_dB+衰落裕量_dB-虚拟软切换增益_dB-接收分集增益_dB和/或多用户分集增益_dB；Wherein, the integrated signal-to-noise ratio value_dB =default demodulation threshold_dB +fading margin_dB -virtual soft handover gain_dB -receive diversity gain_dB and/or multi-user diversity gain_dB of a single antenna;所述邻区干扰因子＝邻区干扰功率/接收本小区功率；The adjacent cell interference factor = adjacent cell interference power/received power of this cell;所述步骤1进一步包括：Said step 1 further includes:判断所述小区边缘前向速率所需的综合信噪比值和邻区干扰因子是否符合以下关系：Judging whether the integrated signal-to-noise ratio value and the adjacent cell interference factor required for the forward rate of the cell edge meet the following relationship:接收本小区功率/(邻区干扰因子×接收本小区功率+热噪声)≥综合信噪比值；或Received cell power/(adjacent cell interference factor×received cell power+thermal noise)≥comprehensive signal-to-noise ratio; or综合信噪比值_(dB)＜-邻区干扰因子_(dB)；Comprehensive signal-to-noise ratio_(dB) <- adjacent cell interference factor_(dB) ;若符合，则为蜂窝小区边缘前向可达速率；If so, it is the cell edge forward reachable rate;所述步骤2进一步包括：Said step 2 further comprises:步骤21，根据所述小区边缘前向可达速率，选定一种，进行蜂窝小区的链路预算，确定蜂窝小区半径；Step 21, according to the forward reachable rate of the cell edge, select one, carry out the link budget of the cell, and determine the radius of the cell;步骤22，设定终端在所述蜂窝小区内的相对位置，用归一化距离“与基站距离r/小区对角半径R_c”表示所述相对位置，并设定通信概率；Step 22, setting the relative position of the terminal in the cell, using the normalized distance "distance from base station r/diagonal radius R_c of the cell" to represent the relative position, and setting the communication probability;步骤23，根据归一化距离和路径传播损耗指数，查找邻区干扰因子和归一化距离的对应关系，获得对应的邻小区干扰因子，查找虚拟软切换增益和归一化距离表的对应关系，获得对应的虚拟软切换增益；Step 23, according to the normalized distance and the path propagation loss index, find the corresponding relationship between the adjacent cell interference factor and the normalized distance, obtain the corresponding adjacent cell interference factor, and find the corresponding relationship between the virtual soft handoff gain and the normalized distance table , to obtain the corresponding virtual soft switching gain;步骤24，根据所述邻小区干扰因子和虚拟软切换增益，进行蜂窝小区内部的链路预算，得到各种前向速率的覆盖半径；Step 24, according to the adjacent cell interference factor and the virtual soft handoff gain, carry out the link budget inside the cell, and obtain the coverage radius of various forward rates;步骤25，换算所述各种前向速率覆盖半径对应的归一化距离，在不小于原设定的归一化距离的速率中选择最高速率，作为小区内部指定位置的前向可达速率。Step 25: Convert the normalized distances corresponding to the coverage radii of the various forward rates, and select the highest rate among the rates not less than the originally set normalized distance as the forward reachable rate at the specified location inside the cell.2.一种蜂窝小区前向可达速率的预测装置，适用于前向发射功率固定的无线通信系统，其特征在于，包括：2. A predictive device for forward reachable rate of a cell, suitable for a wireless communication system with fixed forward transmit power, characterized in that it comprises:一小区边缘可达速率预测模块，用于根据与信噪比相关的多个设计目标因素的需要，设置综合信噪比值，计算各种蜂窝小区边缘前向速率所需的综合信噪比，根据所述综合信噪比值和邻区干扰因子的关系，确认蜂窝小区边缘前向可达速率；A cell edge reachable rate prediction module, used to set the integrated signal-to-noise ratio value according to the needs of multiple design target factors related to the signal-to-noise ratio, and calculate the integrated signal-to-noise ratio required for various cellular cell edge forward rates, According to the relationship between the integrated signal-to-noise ratio value and the adjacent cell interference factor, confirm the forward reachable rate of the cell edge;一小区内部可达速率预测模块，用于根据所述蜂窝小区边缘前向可达速率，设定小区边缘速率，根据小区内部指定位置的归一化距离，获取邻小区干扰因子和虚拟软切换增益，进行蜂窝小区的链路预算，得到各种前向速率的覆盖半径，换算所述覆盖半径对应的归一化距离，在不小于原设定的归一化距离的速率中选择最高速率，作为小区内部指定位置的前向可达速率；A cell internal reachable rate prediction module, used to set the cell edge rate according to the forward reachable rate at the cell edge, and obtain the adjacent cell interference factor and virtual soft handover gain according to the normalized distance of the specified position inside the cell , carry out the link budget of the cell, obtain the coverage radius of various forward rates, convert the normalized distance corresponding to the coverage radius, and select the highest rate among the rates not less than the originally set normalized distance, as The forward reachable rate of the specified location inside the cell;其中，所述综合信噪比值_dB＝单天线的缺省解调门限_dB+衰落裕量_dB-虚拟软切换增益_dB-接收分集增益_dB和/或多用户分集增益_dB；Wherein, the integrated signal-to-noise ratio value_dB =default demodulation threshold_dB +fading margin_dB -virtual soft handover gain_dB -receive diversity gain_dB and/or multi-user diversity gain_dB of a single antenna;所述邻区干扰因子＝邻区干扰功率/接收本小区功率；The adjacent cell interference factor = adjacent cell interference power/received power of this cell;所述小区边缘可达速率预测模块进一步用于，判断所述小区边缘前向速率所需的综合信噪比值和邻区干扰因子是否符合以下关系：The cell edge reachable rate prediction module is further used to determine whether the integrated signal-to-noise ratio value required for the cell edge forward rate and the adjacent cell interference factor meet the following relationship:接收本小区功率/(邻区干扰因子×接收本小区功率+热噪声)≥综合信噪比值；或Received cell power/(adjacent cell interference factor×received cell power+thermal noise)≥comprehensive signal-to-noise ratio; or综合信噪比值_(dB)＜-邻区干扰因子_(dB)；Comprehensive signal-to-noise ratio_(dB) <- adjacent cell interference factor_(dB) ;若符合，则为蜂窝小区边缘前向可达速率；If so, it is the cell edge forward reachable rate;所述小区内部可达速率预测模块进一步包括：The intra-cell achievable rate prediction module further includes:一半径确定模块，用于根据所述小区边缘前向可达速率，进行蜂窝小区的链路预算，确定蜂窝小区半径；A radius determination module, configured to perform a link budget of the cell according to the forward reachable rate of the cell edge, and determine the radius of the cell;一终端位置确定模块，用于设定终端在蜂窝小区内的相对位置，用归一化距离“与基站距离r/小区对角半径R_c”表示所述相对位置，并设定通信概率；A terminal position determination module, used to set the relative position of the terminal in the cell, express the relative position with the normalized distance "r from the base station/diagonal radius R_c of the cell", and set the communication probability;一参数确定模块，用于根据归一化距离和路径传播损耗指数，查找邻区干扰因子和归一化距离的对应关系，获得对应的邻小区干扰因子，查找虚拟软切换增益和归一化距离表的对应关系，获得对应的虚拟软切换增益；A parameter determination module, which is used to find the corresponding relationship between the adjacent cell interference factor and the normalized distance according to the normalized distance and the path propagation loss index, obtain the corresponding adjacent cell interference factor, and find the virtual soft handover gain and the normalized distance The corresponding relationship of the table is obtained to obtain the corresponding virtual soft handover gain;一覆盖半径确定模块，用于根据所述邻小区干扰因子和虚拟软切换增益，进行蜂窝小区的链路预算，得到各种前向速率的覆盖半径；和A coverage radius determination module, which is used to perform link budget of the cell according to the interference factor of the adjacent cell and the virtual soft handover gain, and obtain the coverage radius of various forward rates; and一速率确定模块，用于换算各速率的覆盖半径对应的归一化距离，将不小于预设定的归一化距离的覆盖半径对应的速率中的最高速率，作为小区内部指定位置的前向可达速率。A rate determination module, used to convert the normalized distance corresponding to the coverage radius of each rate, and use the highest rate among the rates corresponding to the coverage radius not less than the preset normalized distance as the forward direction of the specified position inside the cell Achievable rate.3.根据权利要求2所述的蜂窝小区前向可达速率的预测装置，其特征在于，所述无线通信系统进一步包括：CDMA20001XEV-DO系统。3. The device for predicting the forward attainable rate of a cell according to claim 2, wherein the wireless communication system further comprises: a CDMA20001XEV-DO system.4.一种实现权利要求1的蜂窝小区前向可达速率的预测方法的系统，设置于基站中，用于预测蜂窝小区中的移动终端的前向可达速率，其特征在于，包括：4. A system for realizing the method for predicting the forward reachable rate of the cell according to claim 1, which is arranged in the base station for predicting the forward reachable rate of the mobile terminal in the cell, is characterized in that, comprising:一小区边缘可达速率预测模块，用于根据与信噪比相关的多个设计目标因素的需要，设置综合信噪比值，计算各种蜂窝小区边缘前向速率所需的综合信噪比值，根据所述综合信噪比值和邻区干扰因子的关系，确认蜂窝小区边缘前向可达速率；A cell edge reachable rate prediction module, used to set the integrated signal-to-noise ratio value according to the needs of multiple design target factors related to the signal-to-noise ratio, and calculate the integrated signal-to-noise ratio value required for various cell edge forward rates , according to the relationship between the comprehensive signal-to-noise ratio value and the adjacent cell interference factor, confirm the forward reachable rate of the cell edge;一小区内部可达速率预测模块，用于根据所述蜂窝小区边缘前向可达速率，设定小区边缘速率，根据小区内部指定位置的归一化距离，获取邻小区干扰因子和虚拟软切换增益，进行蜂窝小区的链路预算，得到各种前向速率的覆盖半径，换算所述覆盖半径对应的归一化距离，在不小于原设定的归一化距离的速率中选择最高速率，作为小区内部指定位置的前向可达速率；A cell internal reachable rate prediction module, used to set the cell edge rate according to the forward reachable rate at the cell edge, and obtain the adjacent cell interference factor and virtual soft handover gain according to the normalized distance of the specified position inside the cell , carry out the link budget of the cell, obtain the coverage radius of various forward rates, convert the normalized distance corresponding to the coverage radius, and select the highest rate among the rates not less than the originally set normalized distance, as The forward reachable rate of the specified location inside the cell;其中，所述综合信噪比值_dB＝单天线的缺省解调门限_dB+衰落裕量_dB-虚拟软切换增益_dB-接收分集增益_dB和/或多用户分集增益_dB；Wherein, the integrated signal-to-noise ratio value_dB =default demodulation threshold_dB +fading margin_dB -virtual soft handover gain_dB -receive diversity gain_dB and/or multi-user diversity gain_dB of a single antenna;所述邻区干扰因子＝邻区干扰功率/接收本小区功率；The adjacent cell interference factor = adjacent cell interference power/received power of this cell;所述小区边缘可达速率预测模块进一步用于，判断所述小区边缘前向速率所需的综合信噪比值和邻区干扰因子是否符合以下关系：接收本小区功率/(邻区干扰因子×接收本小区功率+热噪声)≥综合信噪比值；或The cell edge reachable rate prediction module is further used to judge whether the integrated signal-to-noise ratio value required for the cell edge forward rate and the adjacent cell interference factor meet the following relationship: receive the power of this cell/(adjacent cell interference factor × Received cell power + thermal noise) ≥ integrated signal-to-noise ratio; or综合信噪比值_(dB)＜-邻区干扰因子_(dB)；Comprehensive signal-to-noise ratio_(dB) <- adjacent cell interference factor_(dB) ;若符合，则为蜂窝小区边缘前向可达速率；If so, it is the cell edge forward reachable rate;所述小区内部可达速率预测模块进一步包括：The intra-cell achievable rate prediction module further includes:一半径确定模块，用于根据所述小区边缘前向可达速率，进行蜂窝小区的链路预算，确定蜂窝小区半径；A radius determination module, configured to perform a link budget of the cell according to the forward reachable rate of the cell edge, and determine the radius of the cell;一终端位置确定模块，用于设定终端在蜂窝小区内的相对位置，用归一化距离“与基站距离r/小区对角半径R_c”表示所述相对位置，并设定通信概率；A terminal position determination module, used to set the relative position of the terminal in the cell, express the relative position with the normalized distance "r from the base station/diagonal radius R_c of the cell", and set the communication probability;一参数确定模块，用于根据归一化距离和路径传播损耗指数，查找邻区干扰因子和归一化距离的对应关系，获得对应的邻小区干扰因子，查找虚拟软切换增益和归一化距离表的对应关系，获得对应的虚拟软切换增益；A parameter determination module, which is used to find the corresponding relationship between the adjacent cell interference factor and the normalized distance according to the normalized distance and the path propagation loss index, obtain the corresponding adjacent cell interference factor, and find the virtual soft handover gain and the normalized distance The corresponding relationship of the table is obtained to obtain the corresponding virtual soft handoff gain;一覆盖半径确定模块，用于根据所述邻小区干扰因子和虚拟软切换增益，进行蜂窝小区的链路预算，得到各种前向速率的覆盖半径；和A coverage radius determination module, which is used to perform link budget of the cell according to the interference factor of the adjacent cell and the virtual soft handover gain, and obtain the coverage radius of various forward rates; and一速率确定模块，用于换算各速率的覆盖半径对应的归一化距离，将不小于预设定的归一化距离的覆盖半径对应的速率中的最高速率，作为小区内部指定位置的前向可达速率。A rate determination module, used to convert the normalized distance corresponding to the coverage radius of each rate, and use the highest rate among the rates corresponding to the coverage radius not less than the preset normalized distance as the forward direction of the specified position inside the cell Achievable rate.

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