CN101577958B - System and method for testing performance of closed loop power control algorithm - Google Patents

Abstract

The invention provides a system and a method for testing the performance of a closed loop power control algorithm; the method comprises the following steps of: sequentially connecting a signal emitter, an attenuator, a channel simulator and a signal receiver; setting the attenuation value of the attenuator; measuring the first RSCP of a first P-CCPCH signal when sequentially connecting the signal emitter, the attenuator, the channel simulator and the signal receiver; taking the difference of a first sending power and the first RSCP as a real loop loss with the unit of dB; loading a testing embodiment and establishing a session link between the signal emitter and the signal receiver; obtaining the real-time sending power of a sending terminal on a service time slot within the prearranged time interval; judging whether the algorithm meets the power requirement or not according to the signal noise ratio of all service time slots; and judging whether the algorithm meets the service qualityrequirement or not according to the data block receiving and transmitting situation of the signal receiver. The system and the method leads the performance test of the closed loop power control algor ithm before practical use to be possible.

Description

A kind of Performance Test System of closed loop power control algorithm and method

Technical field

The present invention relates to field of wireless communications systems, particularly relate to the Performance Test System and the method for the closed loop power control algorithm in a kind of TD-SCDMA of being applied in (TD SDMA) system.

Background technology

As everyone knows, in the system of a CDMA, power control is its lifeline, and the performance of power control has determined the capacity of system.

In the cdma system, the performance of Poewr control method is mainly decided by following two factors:

Receiving terminal is to the requirement of transmitting terminal transmitted power, and promptly to the requirement of receiving terminal antenna port received power, under the prerequisite that satisfies QoS (Quality of Service, service quality), the low more performance that shows of power is good more;

Receiving terminal is to the requirement of Block Error Rate, i.e. satisfying QoS.

Any Poewr control method, its target are to satisfy under the precondition of QoS, make the transmitted power of transmitting terminal as much as possible little.That is, reduce intrasystem interference as much as possible satisfying under the precondition of QoS.

Because the quality of closed loop power control algorithm causes direct influence to service quality, therefore be necessary before closed loop power control algorithm is used, to carry out performance test.

Summary of the invention

The purpose of the embodiment of the invention provides a kind of Performance Test System and method of closed loop power control algorithm, before use closed loop power control algorithm is carried out performance test, has only the closed loop power control algorithm that satisfies business demand just can be applied to real system.

To achieve these goals, the embodiment of the invention provides a kind of performance test methods of closed loop power control algorithm, comprising:

Sender unit, attenuator, channel simulator and signal receiver are connected successively, and the pad value of attenuator is set, line loss when sender unit directly is connected with signal receiver and pad value and equal estimation path loss between sender unit and the signal receiver;

When sender unit, attenuator, channel simulator and signal receiver were connected successively, first Your Majesty that the measuring-signal receiver receives is the first received signal code power RSCP of physical control channel P-CCPCH signal altogether; The one P-CCPCH signal is sent with first transmitted power by the downstream signal transmitter;

As true path loss, unit is dB with the difference of first transmitted power and a RSCP;

When sender unit, attenuator, channel simulator and signal receiver are connected successively, load test case, and set up the session link between sender unit and the signal receiver;

Obtain in the Preset Time section the real-time transmitted power of transmitting terminal on each business time-slot;

At each business time-slot, with the difference of real-time transmitted power and true path loss and true noise power signal to noise ratio as receiving terminal; Transmitted power is dB with the unit of the difference of true path loss and true noise power in real time;

Judge according to the signal to noise ratio of all business time-slots that calculate whether closed loop power control algorithm satisfies power requirement;

The situation that receives transmission data block according to signal receiver judges whether closed loop power control algorithm satisfies quality of service requirement.

The performance test methods of above-mentioned closed loop power control algorithm wherein, also comprised before the pad value of attenuator is set:

Estimation path loss between signal calculated transmitter and the signal receiver; With

Line loss when the test signal transmitter directly is connected with signal receiver.

The performance test methods of above-mentioned closed loop power control algorithm, wherein, the path loss between described sender unit and the signal receiver is A-B-C, unit is dB:

A is the transmitted power of downstream signal transmitting terminal on P-CCPCH of test case correspondence;

B is the power of the equivalence of test case correspondence to the noise of the antenna port of receiving terminal,

C carries out in the closed-loop power control process for the closed power algorithm, the maximum signal to noise ratio of the receiving terminal antenna port of test case correspondence.

The performance test methods of above-mentioned closed loop power control algorithm, wherein, described equivalence is the plate level noise of white noise or signal receiver to the noise of the antenna port of receiving terminal.

The performance test methods of above-mentioned closed loop power control algorithm, wherein, the line loss when the test signal transmitter directly is connected with signal receiver specifically comprises:

Sender unit directly is connected with signal receiver;

Control downstream signal transmitter sends the 2nd P-CCPCH signal with the second constant transmitted power;

The 2nd RSCP of the 2nd P-CCPCH signal that the measurement receiving terminal receives;

With the difference of described second transmitted power and described the 2nd RSCP as the line loss between described sender unit and the signal receiver.

The performance test methods of above-mentioned closed loop power control algorithm, wherein, judge according to the signal to noise ratio of all business time-slots that calculate whether closed loop power control algorithm satisfies power requirement and be specially:

Value according to the signal to noise ratio that writes down is calculated the cumulative distribution probability, and judges whether be less than or equal to preset value in the pairing signal to noise ratio of default cumulative distribution probability, if show that then the closed power algorithm satisfies power requirement, otherwise do not satisfy power requirement.

The performance test methods of above-mentioned closed loop power control algorithm, wherein, the situation that receives transmission data block according to signal receiver judges whether closed loop power control algorithm satisfies quality of service requirement and be specially:

Calculate real-time block error rate BLER at sliding window;

Judge whether all real-time BLER all drop between BLER Upper threshold and the BLER Lower Threshold, if, show that closed loop power control algorithm satisfies quality of service requirement, otherwise, show that closed loop power control algorithm does not satisfy quality of service requirement.

The performance test methods of above-mentioned closed loop power control algorithm, wherein, calculate real-time block error rate BLER at sliding window and specifically comprise:

The size of determining sliding window is the merchant of N and target BLER, and wherein N is a positive constant;

Calculate real-time Block Error Rate, the merchant of the number that real-time Block Error Rate is the transmission block that mistake receives in the sliding window and the size of sliding window.

To achieve these goals, the embodiment of the invention also provides a kind of Performance Test System of closed loop power control algorithm, comprising:

The sender unit of Lian Jieing, attenuator, channel simulator and signal receiver successively, the line loss when sender unit directly is connected with signal receiver and the pad value of attenuator and equal estimation path loss between sender unit and the signal receiver;

Measurement mechanism is used for when sender unit, attenuator, channel simulator and signal receiver are connected successively, and first Your Majesty that the measuring-signal receiver receives is the first received signal code power RSCP of physical control channel P-CCPCH signal altogether; The one P-CCPCH signal is sent with first transmitted power by the downstream signal transmitter;

True path loss calculation element is used for the difference of first transmitted power and a RSCP as true path loss, and unit is dB;

Session link establishment device is used for when sender unit, attenuator, channel simulator and signal receiver are connected successively, loads test case, and sets up the session link between sender unit and the signal receiver;

The snr computation device is used to obtain the real-time transmitted power on inherent each business time-slot of transmitting terminal Preset Time section, and at each business time-slot, with the difference of real-time transmitted power and true path loss and the true noise power signal to noise ratio as receiving terminal; Transmitted power is dB with the unit of the difference of true path loss and true noise power in real time;

Judgment means, be used for judging according to the signal to noise ratio of all business time-slots that calculate whether closed loop power control algorithm satisfies power requirement, and judge according to the situation of signal receiver reception transmission data block whether closed loop power control algorithm satisfies quality of service requirement.

The embodiment of the invention has following beneficial effect:

In the embodiment of the invention, after test environment is provided with, utilize this test environment to obtain the signal to noise ratio and the Data Receiving situation of receiving terminal, and judge respectively according to the signal to noise ratio and the Data Receiving situation of this receiving terminal whether closed loop power control algorithm satisfies power requirement and quality of service requirement, because this test is to carry out before reality is used, therefore according to this test result, have only the closed loop power control algorithm that satisfies business need just can be applied to real system.

Description of drawings

Fig. 1 is the flow chart of performance test methods of the closed loop power control algorithm of the embodiment of the invention;

Fig. 2 is the test environment schematic diagram of the closed loop power control algorithm of the embodiment of the invention.

Embodiment

Assess a kind of performance of closed loop power control algorithm, need assess from the following aspects:

Whether closed loop power control algorithm can satisfy the demand of QoS of survice, if the BLER of receiving terminal real-time statistics (Block Error Rate, Block Error Rate) fluctuates near QoS, shows that then current approach can satisfy the requirement of QoS; With

Professional requirement to transmitted power.

The performance test methods of the closed loop power control algorithm that is used for the TD-SCDMA system of the embodiment of the invention comprises as shown in Figure 1:

Attenuator is provided withstep 11, sender unit, attenuator, channel simulator and signal receiver are connected successively, and the pad value of attenuator is set, line loss when sender unit directly connects with signal receiver and described pad value and value and sender unit and signal receiver between the estimation path loss identical;

Firstmeasures measuring process 12, when sender unit, attenuator, channel simulator and signal receiver are connected successively, the one RSCP of the P-CCPCH signal that the measuring-signal receiver receives (Received Signal Code Power, received signal code power); A described P-CCPCH signal is sent with first transmitted power by downstream signal transmitter (as base station or base station simulator);

True pathloss calculation procedure 13, with the difference (unit is dB) of described first transmitted power and a RSCP as true path loss;

Data record step 14, when sender unit, attenuator, channel simulator and signal receiver are connected successively, and set up session link between sender unit and the signal receiver according to test case, after session link is stable, obtain in the Preset Time section, the real-time transmitted power of transmitting terminal on each business time-slot, and calculate the real-time transmitted power obtain, true path loss and real noise power three's difference (unit is dB), the reception condition of the transmission data block of tracer signal receiver;

First determiningstep 15 judges according to the probability cumulative distribution of the difference that calculates whether closed loop power control algorithm meets the demands;

Second determiningstep 16, the situation that receives transmission data block according to signal receiver judges whether closed loop power control algorithm meets the demands.

Should be noted that at this above-mentionedstep 15 and step 16 do not have strict ordinal relation.

Fig. 2 is the test environment schematic diagram of the embodiment of the invention.

Method to the embodiment of the invention is further elaborated below.

In thestep 11, the pad value of attenuator need be set, path loss between that make line loss when sender unit directly connects with signal receiver and described pad value and value and sender unit and the signal receiver is identical, and therefore described pad value is relevant with following two factors:

Path loss between sender unit and the signal receiver; With

Line loss when sender unit directly is connected with signal receiver.

Below with regard to these two factors determine be elaborated.

Path loss P_{Path_loss}, unit is dB, the antenna port of expression transmitting terminal is to the total power loss between the antenna port of receiving terminal, and is as follows:

$P_{\mathrm{path}\_\mathrm{loss}}=I_{\mathrm{or}}\_\mathrm{PCCPCH}-{\hat{I}}_{\mathrm{or}\_\max }/I_{\mathrm{oc}}-I_{\mathrm{oc}}$

Wherein:

L_Or_ PCCPCH is the transmitted power of the pairing downstream signal transmitting terminal of test case on Primary Common Control Physical Channel P-CCPCH;

For the closed power algorithm carries out in the closed-loop power control process, test case is pairing

The maximum that may reach (maximum signal to noise ratio of receiving terminal antenna port just), it can obtain by link level simulation, and its concrete processing will be described in detail in the back.

Ce Shi business is built the link simulation platform as required, parameter and Gauss's white noise watt level of wireless channel are set according to standard 25.102 fading channels, the number of times of emulation is set according to the size of BLER, such as being benchmark with 50/BLER, and do not limit the minimax transmitted power of transmitting terminal, write down each subframe

The maximum in the record

Add the NdB conduct

N is an empirical value, and value gets final product between 1～5dB.

I_OcBe the noise power of the pairing equivalence of test case to the antenna port of receiving terminal, this noise is the plate level noise of white noise sound source or terminal part.

Can know I by above-mentioned description_Or_ PCCPCH,

And I_OcAll can obtain in advance, so path loss P_{Path_loss}Also can know in advance.

And the line loss when directly being connected with signal receiver for sender unit can be obtained as follows:

Sender unit directly is connected with signal receiver;

Control downstream signal transmitter sends the 2nd P-CCPCH signal with the second constant transmitted power;

The 2nd RSCP (Received SignalCode Power, received signal code power) of the 2nd P-CCPCH signal that the measurement receiving terminal receives;

With the difference of described second transmitted power and described the 2nd RSCP as the line loss between described sender unit and the signal receiver (unit is dB).

Certainly, line loss also can directly be provided with an estimated value, but the accuracy of above-mentioned method of testing is higher.

Line loss when having obtained sender unit and path loss between the signal receiver directly is connected with signal receiver with sender unit by above-mentioned processing, the pad value of attenuator is set to after the difference of the two, can guarantee that follow-up test satisfies basic path loss requirement.

With test CS12.2Kbps reference measure transmission channel is example, the configuration of concrete parameter configuration reference 25.102, the dedicated transmission channel block error probability desired value is 1%, at first determine line loss, the transmitted power of supposing P-CCPCH is 12dBm, the RSCP of the P-CCPCH that receives is-36dBm that the rough estimate of line loss is 48dB so.

Determine path loss, at first rough estimation test needs the path loss that is provided with, suppose use white noise sound source, and the size of its power is-70dBm, utilizes link level simulation, can record above-mentioned test case under the fading environment

The maximum that may reach can reach about 20dB, and the rough estimate value of path loss is 12-20-(70)=62dB so, and the value that attenuator then is set is 62-48=14dB.

Above-mentioned a plurality of step all needs the RSCP of the P-CCPCH signal that the test signal receiver receives, and can obtain by the received power of measuring midamble (training sequence) in the P-CCPCH channel in the specific embodiment of the invention.

After execution ofstep 11, the path loss of the test environment of building roughly meets the demands, but can not be as true path loss, instep 12 and 13, measure true path loss with the test environment of building,, only need by using the received power of midamble part in the apparatus measures P-CCPCH channel because the transmitted power of P-CCPCH is known for receiving terminal, just can obtain the true measurement of path loss by the two difference, it is more accurate than the path loss in thestep 11.

Build the unit/terminal test link, according to method of measurement shown in Figure 6, use equivalence in the actual test loop of same signal strength measurement instrument to the noise power and the real path loss of the antenna port of receiving terminal, with the white noise is example, if white noise sound source input power measurement result is-70.5dBm, the RSCP that measures based on P-CCPCHmidamble is-50.4dBm that then real path loss is 12-(50.4)=62.4dB.

Determine after real path loss and the white noise intensity, set up session link, after waiting for that link is stable, the transmitted power of beginning real-time storage transmitting terminal, can set in advance (as 3～5 minutes) memory time, if the transmitting power of the transmitting terminal of the business time-slot in certain subframe is 0dBm, the signal to noise ratio that receives of receiving terminal then

Be 0-62.4-(70.5)=8.1dB.

At last, according to the signal to noise ratio that writes down

Value calculate the cumulative distribution probability, judge pairing at some default cumulative distribution probability (as 0.9)

If it is pairing to preset cumulative distribution probability (as 0.9)

Be less than or equal to preset value, show that then the closed power algorithm meets the demands, otherwise do not meet the demands, and default cumulative distribution probability (as 0.9) be pairing

More little, show that the closed power algorithm is good more.

Above-mentioned signal to noise ratio

Just the aspect of a judgement also needs to judge according to the situation of signal receiver reception transmission data block whether BLER meets the demands.

At first add up real-time BLER;

Judge whether real-time BLER curve drops between BLER Upper threshold and the Lower Threshold all the time, if, show that closed loop power control algorithm meets the demands, otherwise, show that closed loop power control algorithm does not meet the demands.

Only under the situation that two above-mentioned requirements are all satisfied, closed loop power control algorithm just satisfies requirement, and any one requires not satisfy, and then closed loop power control algorithm does not meet the demands.

For how adding up real-time BLER be described in detail as follows.

The transmission data block that receiving terminal receives is added up, and statistical method is as follows:

At first, the size of determining sliding window is the merchant of N and target BLER (demand of QoS), and wherein N is a constant, and representative value is 10;

Secondly, calculates real-time Block Error Rate and is the merchant of the size of the number of the transmission block that the interior receiving terminal mistake of sliding window receives and sliding window.

Regulation in the normative reference 25.102, if Block Error Rate is positioned at [target BLER* (1-Th), target BLER* (1+Th)] in real time, then closed loop power control algorithm satisfies the demand of QoS.

Wherein, Th is a thresholding, decides with fading environment, as being made as 0.3.

Satisfying fully under the above-mentioned condition, if the mean value of the transmitted power of statistics is big, perhaps cumulative probability distribution curve is kept right, and thinks that then this closed power control performance is relatively poor, otherwise illustrates that then this closed power control performance is better.

The Performance Test System of the closed loop power control algorithm of the embodiment of the invention comprises:

The sender unit of Lian Jieing, attenuator, channel simulator and signal receiver successively, the line loss when sender unit directly is connected with signal receiver and the pad value of attenuator and equal estimation path loss between sender unit and the signal receiver;

Measurement mechanism is used for when sender unit, attenuator, channel simulator and signal receiver are connected successively, and first Your Majesty that the measuring-signal receiver receives is the first received signal code power RSCP of physical control channel P-CCPCH signal altogether; The one P-CCPCH signal is sent with first transmitted power by the downstream signal transmitter;

True path loss calculation element is used for the difference of first transmitted power and a RSCP as true path loss;

Session link establishment device is used for when sender unit, attenuator, channel simulator and signal receiver are connected successively, loads test case, and sets up the session link between sender unit and the signal receiver;

The snr computation device is used to obtain the real-time transmitted power on inherent each business time-slot of transmitting terminal Preset Time section, and at each business time-slot, with the difference of real-time transmitted power and true path loss and the true noise power signal to noise ratio as receiving terminal;

Judgment means, be used for judging according to the signal to noise ratio of all business time-slots that calculate whether closed loop power control algorithm satisfies power requirement, and judge according to the situation of signal receiver reception transmission data block whether closed loop power control algorithm satisfies quality of service requirement.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (9)

1. the performance test methods of a closed loop power control algorithm is characterized in that, comprising:

Downstream signal transmitter, attenuator, channel simulator and signal receiver are connected successively, and the pad value of attenuator is set, line loss when the downstream signal transmitter directly is connected with signal receiver and pad value and equal estimation path loss between downstream signal transmitter and the signal receiver;

When downstream signal transmitter, attenuator, channel simulator and signal receiver were connected successively, first Your Majesty that the measuring-signal receiver receives is the first received signal code power RSCP of physical control channel P-CCPCH signal altogether; The one P-CCPCH signal is sent with first transmitted power by the downstream signal transmitter;

As true path loss, unit is dB with the difference of first transmitted power and a RSCP;

When downstream signal transmitter, attenuator, channel simulator and signal receiver are connected successively, load test case, and set up the session link between downstream signal transmitter and the signal receiver;

Obtain in the Preset Time section the real-time transmitted power of downstream signal transmitter on each business time-slot;

At each business time-slot, with the difference of real-time transmitted power and true path loss and true noise power signal to noise ratio as signal receiver; Transmitted power is dB with the unit of the difference of true path loss and true noise power in real time;

Judge according to the signal to noise ratio of all business time-slots that calculate whether closed loop power control algorithm satisfies power requirement;

The situation that receives transmission data block according to signal receiver judges whether closed loop power control algorithm satisfies quality of service requirement.

2. the performance test methods of closed loop power control algorithm according to claim 1 is characterized in that, also comprises before the pad value of attenuator is set:

Calculate the estimation path loss between downstream signal transmitter and the signal receiver; With

Line loss when test downstream signal transmitter directly is connected with signal receiver.

3. the performance test methods of closed loop power control algorithm according to claim 2 is characterized in that, the path loss between described downstream signal transmitter and the signal receiver is A-B-C, and unit is dB:

A is the transmitted power of downstream signal transmitter on P-CCPCH of test case correspondence;

B is the power of the equivalence of test case correspondence to the noise of the antenna port of signal receiver,

C carries out in the closed-loop power control process for the closed power algorithm, the maximum signal to noise ratio of the signal receiver antenna port of test case correspondence.

4. the performance test methods of closed loop power control algorithm according to claim 3 is characterized in that, described equivalence is the plate level noise of white noise or signal receiver to the noise of the antenna port of signal receiver.

5. according to the performance test methods of claim 2,3 or 4 described closed loop power control algorithms, it is characterized in that the line loss when test downstream signal transmitter directly is connected with signal receiver specifically comprises:

The downstream signal transmitter directly is connected with signal receiver;

Control downstream signal transmitter sends the 2nd P-CCPCH signal with the second constant transmitted power;

The 2nd RSCP of the 2nd P-CCPCH signal that the measuring-signal receiver receives;

With the difference of described second transmitted power and described the 2nd RSCP as the line loss between described downstream signal transmitter and the signal receiver.

6. according to the performance test methods of claim 1,2,3 or 4 described closed loop power control algorithms, it is characterized in that judge according to the signal to noise ratio of all business time-slots that calculate whether closed loop power control algorithm satisfies power requirement and be specially:

Value according to the signal to noise ratio that writes down is calculated the cumulative distribution probability, and judges whether be less than or equal to preset value in the pairing signal to noise ratio of default cumulative distribution probability, if show that then the closed power algorithm satisfies power requirement, otherwise do not satisfy power requirement.

7. according to the performance test methods of claim 1,2,3 or 4 described closed loop power control algorithms, it is characterized in that the situation that receives transmission data block according to signal receiver judges whether closed loop power control algorithm satisfies quality of service requirement and be specially:

Calculate real-time block error rate BLER at sliding window;

Judge whether all real-time BLER all drop between BLER Upper threshold and the BLER Lower Threshold, if, show that closed loop power control algorithm satisfies quality of service requirement, otherwise, show that closed loop power control algorithm does not satisfy quality of service requirement.

8. the performance test methods of closed loop power control algorithm according to claim 7 is characterized in that, calculates real-time block error rate BLER at sliding window and specifically comprises:

The size of determining sliding window is the merchant of N and target BLER, and wherein N is a positive constant;

Calculate real-time Block Error Rate, the merchant of the number that real-time Block Error Rate is the transmission block that mistake receives in the sliding window and the size of sliding window.

9. the Performance Test System of a closed loop power control algorithm is characterized in that, comprising:

Downstream signal transmitter, attenuator, channel simulator and the signal receiver of Lian Jieing successively, the line loss when the downstream signal transmitter directly is connected with signal receiver and the pad value of attenuator and equal estimation path loss between downstream signal transmitter and the signal receiver;

Measurement mechanism is used for when downstream signal transmitter, attenuator, channel simulator and signal receiver are connected successively, and first Your Majesty that the measuring-signal receiver receives is the first received signal code power RSCP of physical control channel P-CCPCH signal altogether; The one P-CCPCH signal is sent with first transmitted power by the downstream signal transmitter;

True path loss calculation element is used for the difference of first transmitted power and a RSCP as true path loss, and unit is dB;

Session link establishment device is used for when downstream signal transmitter, attenuator, channel simulator and signal receiver are connected successively, loads test case, and sets up the session link between downstream signal transmitter and the signal receiver;

The snr computation device, be used to obtain the real-time transmitted power on inherent each business time-slot of downstream signal transmitter Preset Time section, and at each business time-slot, with the difference of real-time transmitted power and true path loss and true noise power signal to noise ratio as signal receiver; Transmitted power is dB with the unit of the difference of true path loss and true noise power in real time;

Judgment means, be used for judging according to the signal to noise ratio of all business time-slots that calculate whether closed loop power control algorithm satisfies power requirement, and judge according to the situation of signal receiver reception transmission data block whether closed loop power control algorithm satisfies quality of service requirement.

Images