CN102238605B - Method for determining mapping relationships between carrier to interference ratios and code error rates - Google Patents
Method for determining mapping relationships between carrier to interference ratios and code error rates Download PDFInfo
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- CN102238605B CN102238605B CN 201010154034 CN201010154034A CN102238605B CN 102238605 B CN102238605 B CN 102238605B CN 201010154034 CN201010154034 CN 201010154034 CN 201010154034 A CN201010154034 A CN 201010154034A CN 102238605 B CN102238605 B CN 102238605B
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Abstract
The invention provides a method for determining mapping relationships between carrier to interference ratios (C/I) and code error rates. The method comprises the following steps of: setting a carrier to interference ratio range in simulation; segmenting the carrier to interference ratio range according to a preset segmentation interval, and performing the link simulation of a preset number of frames on the carrier to interference ratios of each segment to obtain sample points about the carrier to interference ratios and the code error rates; and obtaining a polynomial for the mapping relationships between the carrier to interference ratios and the code error rates by utilizing the sample points. In the simulation, C/I values corresponding to the carrier to interference ratios of each segment are obtained in a way of fixing receiving power C at a receiver and regulating an interference value I at the receiver. By the method, simulation time can be effectively saved.
Description
Technical field
The present invention relates to the emulation technology of mobile communication system, particularly relate to the method for a kind of definite carrier/interface ratio (C/I) and error rate mapping relations.
Background technology
In the system-level fax of mobile communication system, need to determine carrier/interface ratio and error rate mapping relations that to obtain the performance index of system level, wherein, carrier/interface ratio is the ratio of received power and interference value, i.e. C/I.Existing carrier/interface ratio and error rate method for confirming mapping relation may further comprise the steps:
Step 101, according to the practical application scene, the carrier/interface ratio scope carry out emulation is set, for example, this scope is taken as (10dB～20dB).
Step 102, according to certain section gap, determined carrier/interface ratio scope is divided into multistage, the link simulation that respectively every section carrier/interface ratio is carried out some frames obtains corresponding sample point (carrier/interface ratio, the error rate), when carrying out emulation, transmitting terminal fixed transmission power (this transmitting power is through being the C among the C/I behind the channel), by adjust the size of interference value (being the I among the C/I) at receiving terminal, obtain every section corresponding different C/I values of carrier/interface ratio.
For example, section gap is 2dB, to (10dB～20dB) carries out segmentation, then can obtain 15 sections carrier/interface ratios: (10dB,-8dB), (8dB ,-6dB) ..., (18dB, 20dB), every section carrier/interface ratio is carried out respectively emulation such as 10000 frames.Wherein, when every section carrier/interface ratio is carried out emulation, get the median of this section and carry out emulation as the typical value of this section carrier/interface ratio, such as, to (typical value of its C/I is-9dB, when namely carrying out emulation for 10dB ,-8dB) carrier/interface ratio Duan Eryan.Its C/I value will be adjusted to-9dB.
In this step, can obtain sample point as shown in Figure 1.Among Fig. 1, the sample point set that each oval corresponding one section carrier/interface ratio carries out obtaining behind the link simulation of some frames.Here, when every section carrier/interface ratio is carried out emulation, by in the transmitting terminal fixed transmission power, adjust the mode of interference value I at receiving terminal, obtain the typical value C/I of every section carrier/interface ratio, like this, because the fading characteristic of channel, have very large fluctuation range through the received power behind the channel, so the corresponding C/I scope of each elliptical region is larger among Fig. 1.That is to say that for every section carrier/interface ratio, in the sample point set that obtains, sample point can be dispersed in the both sides of the typical value of this section carrier/interface ratio after it is by emulation.
Step 103 according to all sample points that obtain in the step 102 (carrier/interface ratio, the error rate), adopts the method for curve, obtains the mapping relations multinomial of carrier/interface ratio and the error rate.
Utilize the mapping relations multinomial that obtains in the step 103, can realize the mapping between carrier/interface ratio and the error rate, that is, when a known C/I, just can obtain the corresponding error rate according to this multinomial.
Here, step 103 can adopt following method when specific implementation:
All sample points that obtain in the step 102 are divided into groups according to certain C/I interval (such as 0.5 interval), obtain many group sample points, with the error rate of the error rate mean value in every group of sample point as this group sample point.Like this, for the C/I of from-10 to 20 scopes, with error rate of correspondence, this corresponding relation can represent with point in two-dimensional coordinate figure, these points is linked up do curve, just can obtain the multinomial of C/I～BLER every 0.5dB.In system-level emulation, when a known C/I value, utilize the multinomial of this C/I～BLER, just can obtain the corresponding error rate.
In actual applications, the error rate difference that different C/I scopes is corresponding, particularly, when the C/I value is low, the error rate is higher, and when the C/I value was higher, the error rate was lower, namely when the C/I value is low, the error rate is that the sample point of mistake is more, and when the C/I value was higher, the error rate was that the sample point of mistake is less.Like this, when the C/I value is higher, because the sample point of appearance this moment mistake is less, in order to ensure the precision of its corresponding error rate, more sample point in the time of need to hanging down with respect to the C/I value.And described in step 102, because the C/I behind the channel has very large fluctuation range, the sample point in the C/I upper zone will compare less.Therefore, in order to ensure the precision of the error rate, when in step 102, high carrier/interface ratio being carried out emulation, need to carry out link simulation to the frame of a greater number (such as several ten thousand).
This shows that in existing carrier/interface ratio and the error rate method for confirming mapping relation, the frame number that needs during owing to emulation is too many, therefore can cause the time of emulation longer.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method for a kind of definite carrier/interface ratio and error rate mapping relations, and the method can be saved simulation time.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
The method of a kind of definite carrier/interface ratio (C/I) and error rate mapping relations, the method may further comprise the steps:
A, the carrier/interface ratio scope when emulation is carried out in setting;
B, according to default section gap, described carrier/interface ratio scope is carried out segmentation, respectively every section carrier/interface ratio is carried out the link simulation of predetermined number frame, obtain the sample point about carrier/interface ratio and the error rate;
C, utilize described sample point, obtain the mapping relations multinomial of carrier/interface ratio and the error rate.
In the described emulation of step b, by at receiving terminal fixed reception power C, in the mode of receiving terminal adjustment interference value I, obtain every section corresponding C/I value of carrier/interface ratio.
In sum, definite carrier/interface ratio that the present invention proposes and the method for error rate mapping relations, when carrying out emulation, employing is at receiving terminal place fixed reception power, obtain different C/I in the mode of receiving terminal scheduling interference value, like this, error rate during emulation is only relevant with random noise, the very great fluctuation process of having avoided channel fading that the C/I value is produced, so that the sample point of every section carrier/interface ratio concentrates in the less C/I scope, thereby so that needed frame number is less when every section carrier/interface ratio carried out emulation, and then can when improving simulation accuracy, save simulation time.
Description of drawings
Fig. 1 is the probability distribution of samples points schematic diagram of the prior art;
Fig. 2 is the schematic flow sheet of one embodiment of the invention;
Fig. 3 is the probability distribution of samples points schematic diagram among the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Core concept of the present invention is: at receiving terminal fixation of C/I, namely at receiving terminal fixed reception power C, by adjusting different interference value I by receiving terminal, required different C/I (C/I) when obtaining emulation, like this, can avoid the fluctuation of the C/I of channel fading generation, the error rate that obtains during emulation is with only relevant with random noise, correspondingly, every section corresponding sample point of carrier/interface ratio (carrier/interface ratio, the error rate) will concentrate in the less C/I scope, like this, when the high carrier/interface ratio section of C/I value is carried out emulation, only need an emulation hundreds of frame can guarantee that corresponding sample point on the higher carrier/interface ratio satisfies the needs of simulation accuracy, and when the low carrier/interface ratio section of C/I value carried out emulation, because this moment, the error rate be that the sample point of mistake is more, therefore, do not need too many frame can guarantee the precision of emulation.As seen, adopt above-mentioned thought, can guarantee under the prerequisite of simulation accuracy, save simulation time.
Fig. 2 is the schematic flow sheet of one embodiment of the invention.As shown in Figure 2, this embodiment may further comprise the steps:
This step can be arranged according to practical application scene needs by those skilled in the art, and concrete grammar is grasped by those skilled in the art, does not repeat them here.
In this step, with existing method difference be: when emulation, taked to obtain every section corresponding C/I value of carrier/interface ratio in the mode of receiving terminal fixed reception power C.So just can avoid because channel fading causes the error rate in the problem of carrier/interface ratio existence than great fluctuation process, make the sample point that obtains after every section carrier/interface ratio emulation is dropped on the C/I zone of comparatively concentrating (as shown in Figure 3), thereby the sample point of guaranteeing high C/I value place is comparatively concentrated, like this, when every section carrier/interface ratio is carried out emulation, only need an emulation hundreds of frame can obtain higher simulation accuracy, thereby can effectively save system-level simulation time.
Particularly, the described error rate can be bit error rate (BER) or Block Error Rate (BLER).
In this step, can adopt the method for curve, obtain the mapping relations multinomial of carrier/interface ratio and the error rate, concrete grammar is grasped by those skilled in the art, does not repeat them here.
The described error rate in the said method is specifically as follows bit error rate (BER) or Block Error Rate (BLER).
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. the method for a definite carrier interference ratio C/I and error rate mapping relations, the method may further comprise the steps:
A, the carrier/interface ratio scope when emulation is carried out in setting;
B, according to default section gap, described carrier/interface ratio scope is carried out segmentation, respectively every section carrier/interface ratio is carried out the link simulation of predetermined number frame, obtain the sample point about carrier/interface ratio and the error rate;
C, utilize described sample point, obtain the mapping relations multinomial of carrier/interface ratio and the error rate;
It is characterized in that, in the described emulation of step b, by at receiving terminal fixed reception power C, in the mode of receiving terminal adjustment interference value I, obtain every section corresponding C/I value of carrier/interface ratio.
2. method according to claim 1 is characterized in that, the described error rate is bit error rate BER or block error rate BLER.
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| CN 201010154034 CN102238605B (en) | 2010-04-20 | 2010-04-20 | Method for determining mapping relationships between carrier to interference ratios and code error rates |
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| CN 201010154034 CN102238605B (en) | 2010-04-20 | 2010-04-20 | Method for determining mapping relationships between carrier to interference ratios and code error rates |
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| CN102238605B true CN102238605B (en) | 2013-10-30 |
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| BR0210557A (en) * | 2001-06-25 | 2004-05-25 | Nokia Corp | Method for using a radio link in adaptive modulation in the mobile communications system, method for selecting a coding and modulation scheme for use in the mobile communications system, and method for use in the mobile communications system having a radio channel with a time-variant radio channel quality |
| CN101141765B (en) * | 2007-07-11 | 2011-04-20 | 中兴通讯股份有限公司 | Network simulation method in mobile communication system |
| CN101437244B (en) * | 2007-11-16 | 2010-04-14 | 大唐移动通信设备有限公司 | Method and apparatus for implementing link emulation and system emulation interface |
| CN101335967B (en) * | 2008-05-23 | 2012-04-18 | 中兴通讯股份有限公司 | Systematic simulation method and apparatus for wireless communication system |
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