CN103109561A - WCDMA system residual capacity evaluation method, device and equipment - Google Patents

Abstract

The invention provides a WCDMA system residual capacity evaluation method, a device and equipment. The method comprises acquiring the equivalent bandwidth of each business according to the total bandwidth of the WCDMA system, the predetermined error rate, the information rate, and the activity factor of each business in the WCDMA system; acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one business and the total bandwidth of the WCDMA. Therefore the evaluation of the residual capacity can be realized, when various types of the businesses in the WCDMA system exist.

Description

Method, device and equipment for estimating residual capacity of WCDMA (wideband code division multiple Access) system

Technical Field

The present invention relates to communication technology, and more particularly, to a method, an apparatus, and a device for estimating remaining capacity of a Wideband Code Division Multiple Access (WCDMA) system.

Background

Due to the mobility of the mobile terminal, switching between different cells is needed, the residual capacity of the target cell and the residual capacity of the current service cell need to be compared during switching, if the residual capacity of the target cell is more, switching is received, and if not, the switching is refused.

In a Time Division Multiple Access (TDMA) system, the residual capacity of the system can be estimated by calculating the residual Time slot; in a Frequency Division Multiple Access (FDMA) system, the residual capacity can be estimated by calculating the residual bandwidth; a Wideband Code Division Multiple Access (WCDMA) system is a Quality of Service (QoS) limited system, that is, the system capacity depends on the QoS requirement of a user, usually, the QoS requirement of the user is expressed by an error rate, an information rate, and the like, and the user occupies the spectrum bandwidth of the whole system through spread spectrum. Because the WCDMA system has the above characteristics, when calculating the capacity of the WCDMA system, the prior art calculates by analyzing the capacity of a certain service type alone, that is, assuming that the system only supports one service, the maximum number of users that can support the service can be calculated by the speed requirement and the error rate requirement of the service, and the number of users that can be accessed by the remaining capacity can be obtained by subtracting the number of users existing in the system from the maximum number of users.

However, in practical applications, there are often multiple services with different requirements for speed and error rate in a WCDMA system, and when there are multiple service types in the WCDMA system, the remaining capacity of the WCDMA system cannot be calculated by the prior art.

Disclosure of Invention

The embodiment of the invention provides a method, a device and equipment for estimating the residual capacity of a WCDMA system, which aim to solve the problem that in the prior art, when a plurality of service types exist in the WCDMA system, the residual capacity of the WCDMA system cannot be calculated.

In a first aspect, an embodiment of the present invention provides a method for estimating remaining capacity of a wideband code division multiple access WCDMA system, including: acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system;

and acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system.

In a first possible implementation manner, obtaining an equivalent bandwidth of each service according to a total bandwidth of the WCDMA system and a preset error rate, an information rate, and an activation factor of each service in the WCDMA system includes:

acquiring the processing gain of each service according to the total bandwidth of the WCDMA system and the preset information rate of each service;

and acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system, the processing gain, the bit error rate and the activation factor of each service.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the obtaining, according to the total bandwidth of the WCDMA system and an information rate preset for each service, a processing gain of each service includes: according to

Calculating a processing gain for each of said services, wherein G_mW is the total bandwidth of the WCDMA system, R is the processing gain of the service_bInformation rate preset for the service;

the obtaining the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the processing gain, the bit error rate, and the activation factor of each service includes: according to

Calculating an equivalent bandwidth for each of the services, wherein,

is the equivalent bandwidth of said service, gamma_mIs an activation factor for the service in question,

is the bit error rate, G, of the service_mFor the processing gain of the service, Q is an arithmetic function,

in a second aspect, an embodiment of the present invention provides an apparatus for estimating remaining capacity of a wideband code division multiple access WCDMA system, including:

the first calculation unit is used for acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system;

and the second calculating unit is used for acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system.

In a first possible implementation manner, the first computing unit includes:

the first calculating subunit is configured to obtain a processing gain of each service according to a total bandwidth of the WCDMA system and an information rate preset by each service;

and the second calculating subunit is configured to obtain an equivalent bandwidth of each service according to the total bandwidth of the WCDMA system, the processing gain, the bit error rate, and the activation factor of each service.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the first computing subunit is specifically configured to perform the following operations

Calculating a processing gain for each of said services, wherein G_mW is the total bandwidth of the WCDMA system, R is the processing gain of the service_bInformation rate preset for the service;

the second calculating subunit is specifically configured to calculateCalculating an equivalent bandwidth for each of the services, wherein,

is the equivalent bandwidth of said service, gamma_mIs an activation factor for the service in question,

is the bit error rate, G, of the service_mFor the processing gain of the service, Q is an arithmetic function, $Q\left(x\right)=\frac{1}{\sqrt{2\mathrm{\&pi;}}}\underset{x}{\overset{\&infin;}{\&Integral;}}\exp (-{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA00002653806900021.png"\; state="\{\{state\}\}">y</figure-callout>}}^2/2)\mathrm{dy}.$

in a third aspect, an embodiment of the present invention provides an apparatus for estimating remaining capacity of a wideband code division multiple access WCDMA system, including:

the memory is used for storing the preset error rate, information rate and activation factor of each service in the WCDMA system;

and the processor is used for acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system, and acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system.

In a first possible implementation manner, the processor is specifically configured to obtain a processing gain of each service according to a total bandwidth of the WCDMA system and an information rate preset by each service, and obtain an equivalent bandwidth of each service according to the total bandwidth of the WCDMA system, the processing gain, the bit error rate, and the activation factor of each service.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner, the processor is specifically configured to perform the operations according toEach time of calculationProcessing gain of each of said services, wherein G_mW is the total bandwidth of the WCDMA system, R is the processing gain of the service_bInformation rate preset for the service and based onCalculating an equivalent bandwidth for each of the services, wherein,

is the equivalent bandwidth of said service, gamma_mIs an activation factor for the service in question,

is the bit error rate, G, of the service_mFor the processing gain of the service, Q is an arithmetic function, $Q\left(x\right)=\frac{1}{\sqrt{2\mathrm{\&pi;}}}\underset{x}{\overset{\&infin;}{\&Integral;}}\exp (-{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA00002653806900021.png"\; state="\{\{state\}\}">y</figure-callout>}}^2/2)\mathrm{dy}.$

the embodiment of the invention provides a method, a device and equipment for estimating residual capacity of a WCDMA system. When one or more services with different preset error rates, information rates and activation factors exist in the WCDMA system, acquiring the equivalent bandwidth of each service through the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system; and then, acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system. The estimation of the system residual capacity is realized when a plurality of different services exist in the WCDMA system, and the problem that the estimation of the system residual capacity cannot be calculated when the plurality of different services exist in the WCDMA system at the same time in the prior art is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic flow chart of a method for estimating remaining capacity of a WCDMA system according to a first embodiment of the present invention;

FIG. 2 is a flowchart illustrating a second embodiment of the method for estimating remaining capacity of a WCDMA system according to the present invention;

FIG. 3 is a schematic diagram of a system model of a second embodiment of the estimation method for residual capacity of a WCDMA system according to the present invention;

FIG. 4 is a diagram of a constellation diagram of a second QPSK modulation according to an embodiment of the estimation method for the residual capacity of the WCDMA system of the present invention;

FIG. 5 is a flowchart illustrating a third embodiment of the method for estimating remaining capacity of a WCDMA system according to the present invention;

FIG. 6 is a schematic diagram of a first embodiment of an apparatus for estimating remaining capacity of a WCDMA system according to the present invention;

FIG. 7 is a schematic diagram of a second embodiment of the apparatus for estimating remaining capacity of a WCDMA system according to the present invention;

fig. 8 is a schematic structural diagram of an estimation apparatus for residual capacity of a WCDMA system according to a first embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following embodiments of the estimation method, apparatus and device for remaining capacity of the WCDMA system, the WCDMA system may be specifically a variable gain WCDMA system.

Fig. 1 is a schematic flow chart of a first embodiment of a method for estimating remaining capacity of a WCDMA system of the present invention, as shown in fig. 1, the method includes the following steps:

step 101: and acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system.

Specifically, in a WCDMA system, a user service occupies the spectrum bandwidth of the entire system through spread spectrum, the total bandwidth of the system is 3.84M, and the equivalent bandwidth of each service can be obtained through the relationship between the equivalent bandwidth and the total bandwidth, the preset error rate, the preset information rate, and the preset activation factor, under the condition that the preset error rate, information rate, and activation factor of each service are satisfied.

Step 102: and acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system.

Specifically, at least one service exists in the WCDMA system, the equivalent bandwidth of a single service is calculated through step 101, and the remaining capacity of the WCDMA system can be obtained by subtracting the equivalent bandwidth of each service existing in the system from the total bandwidth of the WCDMA system.

In this embodiment, when one or more services with different preset error rates, information rates and activation factors exist in a WCDMA system, the equivalent bandwidth of each service is obtained through the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system; and then, acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system. The estimation of the system residual capacity is realized when a plurality of different types of services exist in the WCDMA system, and the problem that the estimation of the system residual capacity cannot be calculated when a plurality of different services exist in the WCDMA system at the same time in the prior art is solved.

Fig. 2 is a schematic flow chart of a second embodiment of the method for estimating remaining capacity of a WCDMA system of the present invention, and fig. 2 is a more detailed description of the method for estimating equivalent bandwidth of a WCDMA system based on step 101 of the embodiment of the method shown in fig. 1, as shown in fig. 2, the method includes:

step 201: and acquiring the processing gain of each service according to the total bandwidth of the WCDMA system and the preset information rate of each service.

In particular, can be according to

Calculating a processing gain for each service, wherein G_mFor the processing gain of the service, W is the total bandwidth of the WCDMA system, r_bInformation rate preset for the service.

In more detail, the formula

Can be derived according to the following process:

taking the single code channel transmission scheme of the WCDMA system as an example, fig. 3 is a schematic diagram of a system model of a second embodiment of the estimation method of the remaining capacity of the WCDMA system of the present invention; as shown in fig. 3, service data of a source enters a transmitter after being encoded by the source, and the transmitter includes: a channel coding (interleaving/channel adaptive filling), a carrier modulation and a spreading module, wherein the carrier modulation can be a Quadrature Phase Shift Keying (QPSK) modulation mode, all the service rates after processing reach a uniform 3.84Mbps, and the system occupies the whole spectrum bandwidth.

Correspondingly, in the downlink, the service data is received by a downlink receiver via a radio channel having interference and noise characteristics, the receiver comprising: and the despreading module, the carrier demodulation and the channel decoding are carried out, and the service rate reaches the baseband rate after the processing.

Input signal-to-noise ratio of receiver is S_i/N_iWherein S is_iFor input signal power, N_iIs the input noise power. The output signal-to-noise ratio of the receiver is S_o/N_oWherein S is_oTo output signal power, N_oTo output the noise power.

Defining the processing gain of the receiver as the ratio of the output signal-to-noise ratio to the input signal-to-noise ratio, the processing gain of the receiver can be expressed as:

$G=\frac{S_o/N_o}{S_i/N_i}$ -formula 1

In the case of K services of the same type in the system, let P be the signal power of each user service received, W be the spreading bandwidth of the system, and n be₀For the power spectral density of noise, (K-1) P is the interference power of other received users, the input signal-to-noise ratio of the user traffic at the receiver can be expressed as:

$\frac{S_i}{N_i}=\frac{P}{(K-1)P+n_{0}W}$ -formula 2

After despreading and demodulation by the receiver, the traffic signal of the user is completely received, the bandwidth is converted into the base band, and the information rate of the base band signal is set as r_bThe useful traffic signal power at this time is

The other users or the interference noise signal are not correlated with the address code of the user signal and cannot be demodulated, so that the power of the other users or the interference noise signal is kept unchanged. The output snr of the user service at the receiver is:

$\frac{S_o}{N_o}=\frac{\frac{P}{W}\&times;r_b}{(K-1)P+n_{0}W}=\frac{P}{(K-1)P+n_{0}W}\&times;\frac{W}{r_b}$ -formula 3

Taking equations 2 and 3 into equation 1, the processing gain obtained by the process is expressed as:

$G=\frac{S_o/N_o}{S_i/N_i}=\frac{W}{r_b}$ -formula 4

Bringing formula 4 into formula 3, and finishing to obtain:

$\frac{S_o}{N_o}=\frac{P}{(K-1)P+n_{0}W}\&times;G$ -formula 5

In the case where there are a plurality of types of traffic in the system, it is assumed that there are M types of traffic, N, in the system_mFor the number of m-th type of traffic in the system, G_mFor processing gain, gamma, of the m-th type of traffic in the system_mFor the activation factor, P, of the mth type of service in the system_mThe value range of each M is 1, 2,.. multidot.M, and in an additive white Gaussian noise channel model, the thermal noise power is N₀。

The processing gain of the mth type of traffic can be obtained according to equation 4:

$G_m=\frac{W}{r_b}$ -formula 6

According to equation 6, the relationship between the information rate and the processing gain can be obtained, and when the information rate is known, the processing gain corresponding to the type of service can be obtained.

Step 202: and acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the processing gain, the error rate and the activation factor of each service.

In particular, can be according to

The equivalent bandwidth for each service is calculated, wherein,for the equivalent bandwidth of the service, gamma_mIs an activation factor for the service and,as the error rate of the service, G_mFor the processing gain of the service, Q is an arithmetic function,

in more detail, the formula

Can be derived according to the following process:

on the basis of acquiring the relationship between the information rate and the processing gain in step 201, in step 202, first, the relationship between the processing gain, the signal-to-noise ratio, the activation factor and the equivalent bandwidth is acquired; then, acquiring the relation between the signal-to-noise ratio and the bit error rate; and finally, acquiring the relationship between the processing gain, the bit error rate, the activation factor and the equivalent bandwidth.

More specifically, first, the relationship between processing gain, signal-to-noise ratio, activation factor, and equivalent bandwidth is obtained;

in step 201, in the case that there are multiple types of services in the system, the signal-to-noise ratio of the mth type of service at the receiver output is as follows according to equation 5:

$\frac{S_{\mathrm{om}}}{N_{\mathrm{om}}}=\frac{P_m{G}_m}{{\mathrm{\&Sigma;}}_{j=1}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j-P_m{\mathrm{\&gamma;}}_m+N_0}$

$=\frac{P_m{G}_m}{{\mathrm{\&Sigma;}}_{\underset{j\&NotEqual;m}{j=1}}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j+N_m{P}_m{\mathrm{\&gamma;}}_m-P_m{\mathrm{\&gamma;}}_m+N_0}$ -formula 7

When the normal work of the type of service is ensured, the output signal-to-noise ratio must meet a maximumSmall signal-to-noise ratio R_mThe requirements of (a), namely:

$\frac{P_m{G}_m}{{\mathrm{\&Sigma;}}_{\underset{j\&NotEqual;m}{j=1}}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j+N_m{P}_m{\mathrm{\&gamma;}}_m-P_m{\mathrm{\&gamma;}}_m+N_0}\&GreaterEqual;R_m$ -formula 8

Finishing formula 8 to yield:

$\frac{\frac{{\mathrm{\&gamma;}}_m{R}_m}{{\mathrm{\&gamma;}}_m{R}_m+G_m}}{{\mathrm{\&gamma;}}_m-\frac{{\mathrm{\&gamma;}}_m{R}_m}{{\mathrm{\&gamma;}}_m{R}_m+G_m}{\mathrm{\&gamma;}}_m{N}_m}({\mathrm{\&Sigma;}}_{\underset{j\&NotEqual;m}{j=1}}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j+N_0)\&le;P_m$ -formula 9

Order to

Will beta_mCarrying in formula 9, finishing to obtain:

$\frac{{\mathrm{\&beta;}}_m}{{\mathrm{\&gamma;}}_m-{\mathrm{\&beta;}}_m{\mathrm{\&gamma;}}_m{N}_m}({\mathrm{\&Sigma;}}_{\underset{j\&NotEqual;m}{j=1}}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j+N_0)\&le;P_m$

thus, when the type of service is ensured to work normally, the minimum received power is:

$P_m=\frac{{\mathrm{\&beta;}}_m}{{\mathrm{\&gamma;}}_m-{\mathrm{\&beta;}}_m{\mathrm{\&gamma;}}_m{N}_m}({\mathrm{\&Sigma;}}_{\underset{j\&NotEqual;m}{j=1}}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j+N_0)$ -formula 10

Multiplying both sides of equation 10 by (γ) simultaneously_m-β_mγ_mN_m)N_mAnd finishing to obtain:

$N_m{P}_m{\mathrm{\&gamma;}}_m=N_m{\mathrm{\&beta;}}_m\underset{j=1}{\overset{M}{\mathrm{\&Sigma;}}}{N}_j{P}_j{\mathrm{\&gamma;}}_j+N_m{\mathrm{\&beta;}}_m{N}_0$ -formula 11

According to formula 11, N₁P₁γ₁、N₂P₂γ₂、N₃P₃γ₃、......N_mP_mγ_mAnd accumulating and summing to obtain:

${\mathrm{\&Sigma;}}_{j=1}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j={\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_j{\mathrm{\&Sigma;}}_{j=1}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j+N_0{\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_j$ -formula 12

Finishing formula 12 to obtain:

${\mathrm{\&Sigma;}}_{j=1}^M{N}_j{P}_j{\mathrm{\&gamma;}}_j=\frac{N_0{\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_j}{1-{\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_j}$ -formula 13

Bringing formula 13 into formula 10 to obtain:

$P_m=\frac{N_0{\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_j}{1-{\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_j}$ -formula 14

Equation 14 is a solution for ensuring the minimum received power when the service is working normally, and the received power P can be obtained from equation 14_mThe essential conditions for the solution are as follows:

$1-{\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_j>0$ -formula 15

Namely:

${\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_j<1$ -formula 16

The two sides of equation 16 are multiplied by the total bandwidth W simultaneously, and the result is obtained by sorting:

${\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\mathrm{\&beta;}}_{j}W<W$ -formula 17

Order to

Bringing the above formula into formula 17 to obtain:

${\mathrm{\&Sigma;}}_{j=1}^M{N}_j{\&PartialD;}_j<W$ -formula 18

Since W represents the total bandwidth of the system, N_jThe number of j-th type services existing in the system at the same time is represented, and the meaning of the expression can be understood as follows: the condition that the system can guarantee the service QoS requirement is that the quantity of various services in the system is respectively multiplied by the corresponding quantity

Is less than the total bandwidth, and therefore, can sum

And defining the equivalent bandwidth corresponding to the j-th class service.

Thus, it is possible to obtain:

${\&PartialD;}_m={\mathrm{\&beta;}}_{m}W=\frac{{\mathrm{\&gamma;}}_m{R}_{m}W}{{\mathrm{\&gamma;}}_m{R}_m+G_m}$ -formula 19

The relationship between processing gain, signal-to-noise ratio, activation factor and equivalent bandwidth can be derived from equation 19; thus, given the processing gain, snr, and activation factor of a service, the equivalent bandwidth for the service in a WCDMA system can be calculated according to equation 19.

However, in real systems, the QoS requirement of a user is usually expressed by the bit error rate, and therefore, the relationship between the signal-to-noise ratio and the bit error rate is then obtained;

in WCDMA systems, QPSK is used as the modulation method, and the same bit error rate reception can be achieved regardless of whether a matched filter or a correlation receiver is used. Both the I path and Q path of QPSK are Binary Phase Shift Keying (BPSK) modulation, and the two BPSK are orthogonal to each other during ideal coherent demodulation.

FIG. 4 is a constellation diagram of a QPSK modulation according to an embodiment of the estimation method for the residual capacity of the WCDMA system of the present invention, as shown in FIG. 4, the constellation diagram of the QPSK modulation has four constellation points with respective coordinates S₁＝(A，0)、S₂＝(0，A)、S₃＝(-A，0)、S₄(0, -a). From FIG. 4, S can be seen₁And S₃Is 2A, S₁And S₂Is at a distance of

r_bFor bit SNR, defined as the energy E of information per bit_bAnd noise power 2N₀And the energy per bit information expression is as follows:

$E_b={\&Integral;}_0^{T_b}{s}_1^2\left(t\right)\mathrm{dt}=A^2$ -formula 20

Therefore: $r_b=\frac{{\mathrm{<figure-callout\; id="2"\; label="A"\; filenames="HDA00002653806900021.png"\; state="\{\{state\}\}">A</figure-callout>}}^2}{2N_0}$ -formula 21

In the same way, r_sIs the symbol signal-to-noise ratio of QPSK, since each symbol contains 2 bits, and thus the energy per symbol is 2 times the energy per bit of information, i.e. E_s＝2E_b＝2A². Noise power of 2N₀So that the symbol signal-to-noise ratio r can be obtained_sThe expression of (a) is:

$r_s=\frac{A^2}{N_0}$ -formula 22

Approximately by the minimum distance d on the constellation diagram_minCorresponding error rate multiplied by distance d_minIs close to the number M of constellation points_dminTo approximate the symbol error rate for QPSK, i.e.:

$P_s\&ap;M_{d_{\min }}Q\left(\frac{d_{\min }}{\sqrt{2N_0}}\right)$ -formula 23

Wherein Q is an arithmetic function, $Q\left(x\right)=\frac{1}{\sqrt{2\mathrm{\&pi;}}}\underset{x}{\overset{\&infin;}{\&Integral;}}\exp (-{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA00002653806900021.png"\; state="\{\{state\}\}">y</figure-callout>}}^2/2)\mathrm{dy}.$

from fig. 4, the minimum distance between QPSK constellation points is:

$d_{\min }=\sqrt{2A}$

a distance d_minOf adjacent constellation points

An approximate formula for the QPSK symbol error rate can be obtained:

$P_s\&ap;2Q\left(\sqrt{\frac{A^2}{N_0}}\right)=2Q\left(\sqrt{r_s}\right)$ -formula 24

Each symbol or information contains 1og₂M bits, in QPSK, M ═ 4. In systems using gray codes for coding, i.e. only one symbol differs between two adjacent symbols, as in fig. 4, S₁By "00" coding, S₂By "01" coding, S₃Encoding with "11", S₄The encoding is performed with "10".

The method of encoding by using gray code ensures that when the decision error between two adjacent symbols occurs, there is only one bit error, but the error in the adjacent decision domain occurs most easily, so it can be considered approximately that, when the adjacent decision and error occur, only one bit error occurs, and the approximate expression of the bit error rate can be expressed as:

$P_b\&ap;\frac{P_s}{{\log }_{2}M}=\frac{P_s}{2}$ -formula 25

From the equations 21 and 22, the relationship between the symbol SNR and the bit SNR is r_s＝2r_bThe bit error rate in QPSK modulation can be obtained:

$P_b=\frac{1}{2}{P}_s=Q\left(\sqrt{r_s}\right)=Q\left(\sqrt{2r_b}\right)$ -formula 26

The relationship between the bit error rate and the bit signal to noise ratio for the mth type service can be expressed as follows:

$P_b^m=Q\left(\sqrt{2r_b^m}\right)$ -formula 27

Therefore, the first and second electrodes are formed on the substrate, $r_b^m={\left[Q^{-1}\left(P_b^m\right)\right]}^2/2$ -formula 28

Wherein,

for the bit error rate of the m-th type traffic,

is the bit signal-to-noise ratio of the m-th type traffic.

In the embodiment of the present invention, the bit error rate is an error rate, and thus, equation 28 represents the relationship between the error rate and the bit signal to noise ratio of the mth type service.

Finally, the equation 28 is taken into equation 19, and the relationship between the processing gain, the bit error rate, the activation factor and the equivalent bandwidth is obtained, that is:

${\&PartialD;}_m=\frac{{\mathrm{\&gamma;}}_m{\left[Q^{-1}\left(P_b^m\right)\right]}^2/2}{{\mathrm{\&gamma;}}_m{\left[Q^{-1}\left(P_b^m\right)\right]}^2/2+G_m}W$ -formula 29

In this embodiment, the processing gain of each service is obtained according to the total bandwidth of the WCDMA system and the preset information rate of each service; the method comprises the steps of obtaining the equivalent bandwidth of each service according to the total bandwidth of a WCDMA system and the processing gain, the bit error rate and the activation factor of each service, and equating the WCDMA mode to the FDMA mode through an equivalent bandwidth formula, so that the estimation of the residual capacity of the system is facilitated when various different types of services exist in the WCDMA system, and the residual capacity of a target cell is compared with the residual capacity of a current service cell during network switching, and the switching reliability is improved. And because the residual capacity is uniformly expressed by equivalent bandwidth, the load balance of resource management among different systems is facilitated, and the reasonable distribution of resources, the comparison and the scheduling of system resources among cross-systems and the like are facilitated.

FIG. 5 is a flowchart illustrating a third embodiment of the method for estimating remaining capacity of a WCDMA system according to the present invention; this embodiment further illustrates the embodiment shown in fig. 2 by taking a specific application as an example, as shown in fig. 5.

Four types of services in the WCDMA system are assumed, namely voice service, interactive service, streaming service, and background service.

Step 501: and calculating the equivalent bandwidth of each type of service in the WCDMA system.

Voice service: error rate

Coding rate r_b12.2k, activation factor γ₁0.6, W3.84M, using single code channel transmission, according toThe processing gain to obtain voice traffic is:

$G_1=\frac{W}{r_b}=\frac{3840k}{12.2k}=315$

if QPSK modulation and demodulation is adopted, then the method is based on

Calculating the equivalent bandwidth of one path of voice service as follows:

${\&PartialD;}_1=\frac{{\mathrm{\&gamma;}}_1{\left[Q^{-1}\left(P_b^1\right)\right]}^2/2}{{\mathrm{\&gamma;}}_1{\left[Q^{-1}\left(P_b^1\right)\right]}^2/2+G_1}W=\frac{0.6\&times;4.774}{0.6\&times;4.774+315}\&times;3840k=35k$

interactive services: error rate

Data rate r_b64k, activation factor γ₂0.3, W3840 k, using single code channel transmission, according toThe processing gain to obtain voice traffic is:

${\mathrm{<figure-callout\; id="2"\; label="G"\; filenames="HDA00002653806900021.png"\; state="\{\{state\}\}">G</figure-callout>}}_2=\frac{W}{r_b}=\frac{3840k}{64k}=60$

if QPSK modulation and demodulation is adopted, then the method is based on

Calculating the equivalent bandwidth of one path of voice service as follows:

${\&PartialD;}_2=\frac{{\mathrm{\&gamma;}}_2{\left[Q^{-1}\left(P_b^2\right)\right]}^2/2}{{\mathrm{\&gamma;}}_2{\left[Q^{-1}\left(P_b^2\right)\right]}^2/2+G_2}W=\frac{0.3\&times;4.774}{0.3\&times;4.774+60}\&times;3840k=89.5k$

and (3) stream type service: error rate

Data rate r_b64k, activation factor γ₃1, W-3.84M, using single code channel transmission, according to

The processing gain to obtain voice traffic is:

$G_3=\frac{W}{r_b}=\frac{3840k}{64k}=60$

if QPSK modulation and demodulation is adopted, then the method is based on

Calculating the equivalent bandwidth of one path of voice service as follows:

${\&PartialD;}_3=\frac{{\mathrm{\&gamma;}}_3{\left[Q^{-1}\left(P_b^3\right)\right]}^2/2}{{\mathrm{\&gamma;}}_3{\left[Q^{-1}\left(P_b^3\right)\right]}^2/2+G_3}W=\frac{1\&times;4.774}{1\&times;4.774+60}\&times;3840k=283k$

background class service: error rate

Data rate r_b64k, activation factor γ₄0.2, W3.84M, using single code channel transmission, according to

The processing gain to obtain voice traffic is:

$G_4=\frac{W}{r_b}=\frac{3840k}{64k}=60$

if QPSK modulation and demodulation is adopted, then the method is based on

Calculating the equivalent bandwidth of one path of voice service as follows:

${\&PartialD;}_4=\frac{{\mathrm{\&gamma;}}_4{\left[Q^{-1}\left(P_b^4\right)\right]}^2/2}{{\mathrm{\&gamma;}}_4{\left[Q^{-1}\left(P_b^4\right)\right]}^2/2+G_3}W=\frac{0.2\&times;4.774}{0.2\&times;4.774+60}\&times;3840k=60.2k$

step 502: and calculating the residual capacity of the WCDMA system.

Assuming that there are 30 voice services, 3 streaming services, 10 interactive services and 2 background services in the system, the remaining capacity of the system is the total bandwidth of the system minus the equivalent bandwidth occupied by each service, that is:

3840k-35k×30-283k×3-89.5k×10-60.2k×2＝925.6k

the remaining capacity of the system can carry any service, and the number of services that the system can carry can be obtained by dividing the remaining capacity by the equivalent bandwidth corresponding to the service, for example, the system can also carry 11 voice services, 1 streaming service, 2 interactive services, and 1 background service, and the remaining capacity of the system is 18.4k, which is not enough to carry any service, and the system reaches the maximum capacity. Or, the system can carry 4 voice services, 2 streaming services and 2 interactive services, the residual capacity of the system is 40.6k, which is not enough to carry any service, and the system capacity reaches the maximum. Any form of traffic combination can provide reliable transmission as long as the sum of the equivalent bandwidths of all the traffic in the system is less than the total bandwidth of the system.

FIG. 6 is a schematic diagram of a WCDMA system remaining capacity estimation apparatus according to a first embodiment of the present invention. As shown in fig. 6, the apparatus includes a first calculating unit 61 and a second calculating unit 62, where the first calculating unit 61 is configured to obtain an equivalent bandwidth of each service according to a total bandwidth of a WCDMA system and a preset error rate, an information rate, and an activation factor of each service in the WCDMA system; the second calculating unit 62 is configured to obtain the remaining capacity of the WCDMA system according to the equivalent bandwidth of the at least one service and the total bandwidth of the WCDMA system.

The apparatus of this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 1, and the implementation principle and the execution manner of the apparatus may refer to the method embodiment shown in fig. 1, which are not described herein again. In this embodiment, when there are one or more services with different preset error rates, information rates and activation factors in the WCDMA system, the first calculating unit obtains the equivalent bandwidth of each service through the total bandwidth of the WCDMA system and the error rate, information rate and activation factor preset for each service in the WCDMA system; then, the second calculating unit obtains the remaining capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system. The estimation of the system residual capacity is realized when a plurality of different services exist in the WCDMA system at the same time, and the problem that the estimation of the system residual capacity cannot be calculated when the plurality of different services exist in the WCDMA system at the same time in the prior art is solved.

FIG. 7 is a schematic diagram of a second embodiment of the estimation apparatus for residual capacity of WCDMA system according to the present invention. The apparatus of the present embodiment is based on the embodiment of the apparatus shown in fig. 6, and further, the first calculating unit 61 may include: a first calculating subunit 611 and a second calculating subunit 612, where the first calculating subunit 611 is configured to obtain a processing gain of each service according to a total bandwidth of the WCDMA system and an information rate preset by each service; a second calculating subunit 612, configured to obtain an equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the processing gain, the bit error rate, and the activation factor of each service.

Further, the first calculating subunit 611 is specifically configured to calculate

Calculating a processing gain for each service, wherein G_mFor the processing gain of the service, W is the total bandwidth of the WCDMA system, R_bInformation rate preset for the service; the second calculating subunit 612 is specifically configured to calculate

The equivalent bandwidth for each service is calculated, wherein,

for the equivalent bandwidth of the service, gamma_mIs an activation factor for the service and,

as the error rate of the service, G_mFor the processing gain of the service, Q is an arithmetic function, $Q\left(x\right)=\frac{1}{\sqrt{2\mathrm{\&pi;}}}\underset{x}{\overset{\&infin;}{\&Integral;}}\exp (-{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA00002653806900021.png"\; state="\{\{state\}\}">y</figure-callout>}}^2/2)\mathrm{dy}.$

the apparatus of this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the execution mode thereof refer to the method embodiment shown in fig. 2, which are not described herein again. In this embodiment, the first calculating subunit obtains a processing gain of each service according to a total bandwidth of the WCDMA system and a preset information rate of each service; the second calculating subunit obtains the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the processing gain, the bit error rate and the activation factor of each service, and the WCDMA mode is equivalent to the FDMA mode through the formula of the equivalent bandwidth, so that the residual capacity of the system can be conveniently estimated when various different services exist in the WCDMA system, and therefore, the residual capacity of a target cell can be conveniently compared with the residual capacity of the current service cell during network switching, and the switching reliability is improved. And because the residual capacity is uniformly expressed by equivalent bandwidth, the load balance of resource management among different systems is facilitated, and the reasonable distribution of resources, the comparison and the scheduling of system resources among cross-systems and the like are facilitated.

Fig. 8 is a schematic structural diagram of an estimation apparatus for residual capacity of a WCDMA system according to a first embodiment of the present invention. As shown in fig. 8, the apparatus includes a memory 81 and a processor 82, wherein the memory 81 is used for storing the preset error rate, information rate and activation factor of each service in the WCDMA system; the processor 82 is configured to obtain an equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and a preset error rate, an information rate, and an activation factor of each service in the WCDMA system, and obtain the remaining capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system.

The device of this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 1, and the implementation principle and the execution mode of the device may refer to the method embodiment shown in fig. 1, which are not described herein again. In this embodiment, when there are one or more services with different preset error rates, information rates and activation factors in the WCDMA system, the error rates, information rates and activation factors preset for each service in the WCDMA system are stored through the memory; the processor acquires the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system; and then, acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system. The estimation of the system residual capacity is realized when a plurality of different services exist in the WCDMA system, and the problem that the estimation of the system residual capacity cannot be calculated when the plurality of different services exist in the WCDMA system at the same time in the prior art is solved.

In the foregoing embodiment, the processor 82 is specifically configured to obtain the processing gain of each service according to the total bandwidth of the WCDMA system and the preset information rate of each service, and obtain the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the processing gain, the bit error rate, and the activation factor of each service.

Further, the processor 82 is specifically configured to operate in accordance with

Calculating a processing gain for each service, wherein G_mFor the processing gain of the service, W is the total bandwidth of the WCDMA system, R_bInformation rate preset for service and based on

The equivalent bandwidth for each service is calculated, wherein,

for the equivalent bandwidth of the service, gamma_mIs an activation factor for the service and,

as the error rate of the service, G_mFor the processing gain of the service, Q is an arithmetic function, $Q\left(x\right)=\frac{1}{\sqrt{2\mathrm{\&pi;}}}\underset{x}{\overset{\&infin;}{\&Integral;}}\exp (-{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA00002653806900021.png"\; state="\{\{state\}\}">y</figure-callout>}}^2/2)\mathrm{dy}.$

the device of this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the execution mode of the device refer to the method embodiment shown in fig. 2, which are not described herein again. In this embodiment, the processor obtains a processing gain of each service according to the total bandwidth of the WCDMA system and the preset information rate of each service; then, according to the total bandwidth of the WCDMA system and the processing gain, the bit error rate and the activation factor of each service, the equivalent bandwidth of each service is obtained, the WCDMA mode is equivalent to the FDMA mode through the formula of the equivalent bandwidth, and the estimation of the residual capacity of the system is facilitated when various different services exist in the WCDMA system, so that the residual capacity of the target cell is compared with the residual capacity of the current service cell during network switching, and the switching reliability is improved. And because the residual capacity is uniformly expressed by equivalent bandwidth, the load balance of resource management among different systems is facilitated, and the reasonable distribution of resources, the comparison and the scheduling of system resources among cross-systems and the like are facilitated.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A method for estimating the residual capacity of a WCDMA system comprises the following steps:

acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system;

and acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system.

2. The method of claim 1, wherein obtaining the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system comprises:

acquiring the processing gain of each service according to the total bandwidth of the WCDMA system and the preset information rate of each service;

and acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system, the processing gain, the bit error rate and the activation factor of each service.

3. The method of claim 2,

the acquiring the processing gain of each service according to the total bandwidth of the WCDMA system and the preset information rate of each service includes: according to

Calculating a processing gain for each of said services, wherein G_mW is the total bandwidth of the WCDMA system, R is the processing gain of the service_bInformation rate preset for the service;

the obtaining the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the processing gain, the bit error rate, and the activation factor of each service includes: according to

Calculating an equivalent bandwidth for each of the services, wherein,

is the equivalent bandwidth of said service, gamma_mIs an activation factor for the service in question,

is that it isError rate of traffic, G_mFor the processing gain of the service, Q is an arithmetic function,

4. an estimation apparatus for remaining capacity of a wideband code division multiple access, WCDMA, system, comprising:

the first calculation unit is used for acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system;

and the second calculating unit is used for acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system.

5. The apparatus of claim 4, wherein the first computing unit comprises:

the first calculating subunit is configured to obtain a processing gain of each service according to a total bandwidth of the WCDMA system and an information rate preset by each service;

and the second calculating subunit is configured to obtain an equivalent bandwidth of each service according to the total bandwidth of the WCDMA system, the processing gain, the bit error rate, and the activation factor of each service.

6. The apparatus of claim 5,

the first computing subunit is specifically configured to compute according to

Calculating a processing gain for each of said services, wherein G_mW is the total bandwidth of the WCDMA system, R is the processing gain of the service_bInformation rate preset for the service;

the second calculation receiptThe element is used according to

Calculating an equivalent bandwidth for each of the services, wherein,

is the equivalent bandwidth of said service, gamma_mIs an activation factor for the service in question,

is the bit error rate, G, of the service_mFor the processing gain of the service, Q is an arithmetic function, $Q\left(x\right)=\frac{1}{\sqrt{2\mathrm{\&pi;}}}\underset{x}{\overset{\&infin;}{\&Integral;}}\exp (-y^2/2)\mathrm{dy}.$

7. an estimation apparatus for remaining capacity of a wideband code division multiple access, WCDMA, system, comprising:

the memory is used for storing the preset error rate, information rate and activation factor of each service in the WCDMA system;

and the processor is used for acquiring the equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the preset error rate, information rate and activation factor of each service in the WCDMA system, and acquiring the residual capacity of the WCDMA system according to the equivalent bandwidth of at least one service and the total bandwidth of the WCDMA system.

8. The apparatus of claim 7, wherein the processor is specifically configured to obtain a processing gain of each service according to a total bandwidth of the WCDMA system and a preset information rate of each service, and obtain an equivalent bandwidth of each service according to the total bandwidth of the WCDMA system and the processing gain, the bit error rate, and the activation factor of each service.

9. The apparatus according to claim 7 or 8,

the processor is specifically configured to operate in accordance with

Calculating a processing gain for each of said services, wherein G_mW is the total bandwidth of the WCDMA system, R is the processing gain of the service_bInformation rate preset for the service and based on

Calculating an equivalent bandwidth for each of the services, wherein,

is the equivalent bandwidth of said service, gamma_mIs an activation factor for the service in question,is the bit error rate, G, of the service_mFor the processing gain of the service, Q is an arithmetic function, $Q\left(x\right)=\frac{1}{\sqrt{2\mathrm{\&pi;}}}\underset{x}{\overset{\&infin;}{\&Integral;}}\exp (-y^2/2)\mathrm{dy}.$

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