CN101159516B - Method of testing terminal channel gain characteristic - Google Patents
Method of testing terminal channel gain characteristic Download PDFInfo
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- CN101159516B CN101159516B CN2007101820328A CN200710182032A CN101159516B CN 101159516 B CN101159516 B CN 101159516B CN 2007101820328 A CN2007101820328 A CN 2007101820328A CN 200710182032 A CN200710182032 A CN 200710182032A CN 101159516 B CN101159516 B CN 101159516B
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Abstract
A method for testing the gain characteristics of terminal subchannels is provided, which comprises: after determining the access of the terminal to the base station, the road loss is increased to allow the measurement of distance between the terminal and the base station unsuccessful, and the current uplink transmission power of the terminal is used as the reference power; the base station calculates the bandwidth capacity of each uplink subchannel based on the system configuration parameters; the road loss is reduced to allow the access of the terminal to the base station, and the base station distributes the terminal with the calculated bandwidth capacity of the uplink subchannel; the base station increases the transmission power of the terminal until the transmission power reaches the maximum limit, and the current transmission power of the terminal is used as measured power; and the basic power and the measured power are compared to judge whether the terminal has the subchannel gain characteristics based on the comparison result. The invention can evaluate whether the WiMAX terminal has the subchannel gain characteristics, without using the special radio-frequency test instrument and complex measurement of radio-frequency signal power. Additionally, the invention has no strict environmental requirement, is convenient to operate, and has high test efficiency.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of method of testing terminal channel gain characteristic.
Background technology
(covering and the optimization problem of WiMAX network become increasingly conspicuous for Worldwide Interoperability forMicrowave Access, the WiMAX) maturation of product and technology along with micro-wave access to global intercommunication.Yet, in real world applications, oppositely limited situation then is more common, according to IEEE 802.16 agreements, do not having under the situation of power control instruction, the WiMAX terminal keeps transmit power spectral density constant, that is to say, the transmitting power of terminal give with base station assigns it number of sub-channels variation and change in proportion, the number of sub-channels of distribution is few, terminal transmit power also reduces, like this, just must promote the transmitting power density of terminal by power control, make that the transmitting power of terminal can get a promotion when the less number of sub-channels of terminal distribution is given in the base station.Therefore, the average sub-carrier power of up channel can have a distinct increment, and then obtains the subcarrier average power of a maximum, and this is beneficial to the detection and the demodulation of base station side to upward signal, thereby avoids occurring oppositely limited situation.
Like this, for terminal, under up maximum transmission power condition of limited, whole transmitting powers can be focused on the subchannel just becomes the key of problem.Therefore, whether the WiMAX terminal is possessed channel gain characteristic is tested and verifies very important, yet, because the existence of Dynamic Bandwidth Allocation mechanism and the frequency-distributed of subcarrier that subchannel comprises, simple effective and accurate and visual WiMAX null terminator Null channel gain characteristic test technology still belongs to blank at present.
Summary of the invention
Consider the problems referred to above and make the present invention, for this reason, main purpose of the present invention is to provide a kind of scheme of testing terminal channel gain characteristic, it can judge quickly and easily whether the WiMAX terminal possesses corresponding subchannel gains ability, makes it can use and avoid occurring up limited problem in the real network environment.
According to embodiments of the invention, provide a kind of method of testing terminal channel gain characteristic.
This method comprises: step S102, confirm that terminal can access base station after, increase path loss, the range finding of terminal and described base station is failed, with this moment terminal transmitting power as the reference power record; Step S104, the bandwidth capacity of single up subchannel is calculated in the base station according to system configuration parameter; Step S106 makes base station access by terminal by reducing path loss, the bandwidth capacity of the single up subchannel that the base station calculates terminal distribution; Step S108, the base station is by improve the transmitting power of terminal to terminal transmitted power climb command, till this transmitting power can not improve, and will this moment the transmitting power of terminal as measuring power trace; And step S110, with reference power with measure power and compare, under the situation about equating, the judgement terminal possesses channel gain characteristic at reference power and the comparing result of measuring power.
Wherein, in step S106, the base station with first time domain after the mode of frequency domain initiatively distribute bandwidth capacity frame by frame to terminal.
In addition, at step S102, step S104, step S106 and step S108, guarantee to have transfer of data between terminal and the base station.At this moment, in step S106, terminal utilize the packet under the bandwidth capacity transmission specific modulation coded system to guarantee and the application server of base station between have transfer of data.Wherein, above-mentioned specific modulation coded system is a quaternary PSK, and encoding rate is 1/2.
In addition, the said system parameter in this method comprises at least: Fourier change count, subchannel bias mode, up-downgoing symbol ratio.
By technique scheme of the present invention, can assess the WiMAX terminal and whether possess channel gain characteristic; And, when realizing, do not relate to using and the complexity of radio frequency signal power being measured of special-purpose radio-frequency tester, low to environmental requirement, easy to operation, have very high testing efficiency.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the method for the testing terminal channel gain characteristic of the embodiment of the invention;
Fig. 2 is the block diagram of realization according to the test environment example of the method for the testing terminal channel gain characteristic of the embodiment of the invention; And
Fig. 3 is the method that realizes according to the testing terminal channel gain characteristic of the embodiment of the invention.
Embodiment
A kind of method of testing terminal channel gain characteristic is provided in the present embodiment.Wherein, the subchannel number that this method is used terminal is quantized, and adjusts the also size of the uplink transmission power of test terminal support on this basis, confirms whether this terminal possesses channel gain characteristic.In this article, the terminal channel gain characteristic is meant whether terminal possesses subchannel full power emissivities, that is, terminal arrives the ability of base station (BS) to coming on the minimum contained subcarrier of subchannel of its distribution with whole power concentration.
As shown in Figure 1, method according to the testing terminal channel gain characteristic of the embodiment of the invention comprises: step S102, confirm that terminal can access base station after, constantly increase path loss, make terminal and base station the range finding (Range) failure, with this moment terminal uplink transmission power as the reference power record; Step S104, the bandwidth capacity of single up subchannel is calculated in the base station according to system configuration parameter; Step S106 makes base station access by terminal by reducing path loss, the bandwidth capacity of the single up subchannel that the base station calculates terminal distribution (among the step S104); Step S108, the transmitting power of terminal is improved in the base station, till the transmitting power that improves can not improve (for example, having reached the maximum transmission power of terminal), and will this moment the transmitting power of terminal as measuring power trace; And step S110, reference power and measurement power are compared, judge according to comparing result whether terminal possesses channel gain characteristic.
Wherein, in step S106, the base station with first time domain after the mode of frequency domain initiatively distribute the bandwidth capacity capacity frame by frame to terminal, and the bandwidth request sent of response terminal not.
In addition, in step S108, the base station is by improving the transmitting power of terminal to terminal transmitted power climb command.
In step S110, be that then terminal possesses channel gain characteristic under the situation about equating at reference power and the comparing result of measuring power.
In addition, at step S102, step S104, step S106 and step S108, guarantee to have transfer of data between terminal and the base station.At this moment, in step S106, terminal utilize packet under the bandwidth capacity transmission specific modulation coded system to guarantee and the application server of base station between have transfer of data (for example, making file from application server downloads).Wherein, above-mentioned specific modulation coded system is quaternary PSK (QPSK), and encoding rate is 1/2.
In addition, the said system parameter in this method comprises at least: Fourier change count, subchannel bias mode, up-downgoing symbol ratio.It is a plurality of to should be noted that the system parameters of using when the computation bandwidth capacity has, and the up-downgoing symbol is than being main of being applied to.
When reality realizes method according to the embodiment of the invention, specifically can carry out following steps:
(1) set up effective test environment, make base station access by terminal, set up the up-downgoing Business Stream, obtain the logical application server of IP address and ping, wherein, the structure of test environment as shown in Figure 2;
(2) increase path loss, the maximum power in the record access range finding failure procedure on the end-user interface is as the maximum uplink transmission power referential data (that is said reference power) of terminal;
(3) according to system configuration parameter, especially the up-downgoing symbol is given the bandwidth capacity that calculates the bandwidth value of terminal than the bandwidth capacity that calculates up single subchannel under the specific modulation coded system as base station assigns;
(4) reduce path loss, make base station access by terminal, the base station according to first time domain after the mode of frequency domain, give the specific upstream bandwidth of terminal distribution, terminal is used this bandwidth, and uses specific modulation coding mode to connect application server and carry out transfer of data;
(5) base station side is to end side transmitted power climb command, and the transmitting power that progressively promotes MS is to maximum power, and record.
(6) the emission maximum gross power numerical value that shows according to terminal interface judges whether terminal possesses channel gain characteristic.
Come above-mentioned processing of the present invention is elaborated below in conjunction with concrete test scene.
Fig. 2 is the test environment schematic diagram of method of testing of the present invention.
In step (1), as shown in Figure 2, above-mentioned Validity Test environment comprises: terminal, base station, IAD, aaa server and application server and OMC backstage.Wherein, aaa server and application server can be shared, and the OMC backstage is optional part.The user name that terminal is used must be registered on AAA, and IAD need possess IP address assignment and managerial ability, and application server need dispose reverse route or gateway.Make the ping bag can correctly turn back to end side.
In step (1), the implication of setting up effective test environment is: terminal is installed and is used correct driving and user interface software, the base station system operate as normal, and terminal has identical working frequency points and bandwidth with the base station.Terminal and base station are set up synchronously, and access procedure is followed the definition of 802.16e agreement, and the Business Stream of being set up can be the Qos Business Stream of any type, and the IP address that is obtained can be that the DHCP mode obtains, and also can be the mode of static binding MAC Address.And the link between terminal and the base station can be that wireless channel also can be a wired connection.If wireless channel, by adjusting distance and the Position Control path loss between antenna and the terminal, if wired connection is then controlled the path loss size by the attenuation of regulated attenuator.
In addition, in step (1), behind base station access by terminal to be measured, set up the up-downgoing Business Stream, obtain the IP address, at this moment,, can confirm that then whole test environment is working properly if can continue the logical application server of ping.
In step (2), strengthen fading channel, make base station access by terminal Range failure, the terminal maximum transmission power during record Range failure on terminal use's software interface is generally the referential data of 23dbm. as follow-up maximum transmission power.
And, in step (2), the Range process of terminal is to go forward to finish in 3 symbols at 6 subchannels of fixing of protocol requirement, at the channel path loss big so that can't the Range case of successful under, terminal oneself, the base station also will continue simultaneously requires terminal lifting Range power, terminal promotes Range power up to maximum power according to the step-length of setting, at this moment, the terminal transmit power when just Range finishes, this power are distributed on 6 subchannels of Range use.
Afterwards, reduce fading channel, make base station access by terminal success, write down the terminal uplink transmission power that successfully obtains behind the IP address, at this moment, set the up CINR numerical value of expectation, for example, can be set to 10db, start the FTP data upload, behind to be transmitted the stablizing, observe the transmitting power of terminal this moment, find that the terminal uplink transmission power promotes to some extent, transfer of data finishes or stops after the transmission, observe terminal transmit power and have reduction, so just illustrate that terminal is guaranteeing that the number of sub-channels of use is many under the constant substantially situation of up CINR numerical value, then transmitting power has increase, the number of sub-channels of using is few, and transmitting power has minimizing.
In addition, computational process in step (3) is as follows: the 1024 point Fourier conversion of 10M bandwidth, PUSC use the up-downgoing symbol under whole subchannels, the 5ms frame condition to calculate as example than 31: 15 in the TDD duplex mode, remove the range expense of 3 symbols, at this moment, the Payload slot quantity of a up subchannel correspondence is, 1 * (15-3)/3=4, each slot contains 48 subcarriers, under QPSK 1/2 modulation system, portable byte number is 6, like this, QPSK 1/2 time, the bandwidth of a subchannel correspondence is 24 bytes.
In the step (4), bandwidth can be by terminal to apply, and the mode of application comprises the bandwidth application code, bandwidth application prefix, and also can initiatively distribute bandwidth by the base station.Have only a channel in order to ensure the bandwidth that test is used, the mode that test adopts the every frame in base station initiatively to distribute nominated bandwidth, the branch of bandwidth is mixed, and the base station needs the method for frequency domain after the up first time domain that protocol compliant requires.The effect that the connection application server carries out file transfer is to allow terminal use this bandwidth to carry out up emission.Fig. 3 is the distribution schematic diagram of the up subchannel in base station, and wherein, the gain that Test slot (test time slot) obtains is 15.4db (10log35) to the maximum.
After above step confirmed, the base station is configured, enables power control, and make the every frame in base station initiatively the bandwidth calculated of allocation step 3 give the terminal that inserts.
In step (5), the base station is to terminal transmitted power climb command, and the base station need send order continuously according to the power step size 0.25db of protocol requirement.The mode of using comprises PMC message, FPC message or Power Control IE mode.Terminal needs the instruction of correct parsing and the rising of execution power up to reaching maximum transmission power.The current uplink transmission power of terminal is presented on terminal use's software interface.Power climb command of every execution is then confirmed and is write down this magnitude of power, till no longer changing.Need in the implementation process to guarantee that signal power that the base station receives does not reach the saturation point of base station received power, avoid the terminal upward signal to worsen and off-grid.
At last, whether the maximum transmission power of record is consistent in maximum transmission power that step (6) is confirmed record in the step 5 and step 2, if unanimity illustrates that then tested WiMAX terminal possesses the subchannel gains disposal ability; If inconsistent, illustrate that then the test terminal does not possess the subchannel gains disposal ability.
Need to prove that terminal has channel gain characteristic, representative system can directly not utilize this characteristic to solve oppositely limited problem, can know from the analysis of front.Real system needs the cooperation of bandwidth of base station distribution mechanism to the utilization of null terminator Null channel gain, and when terminal transmit power was limited, scheduling reduced the lifting that the subchannel number of distributing to this terminal is beneficial to the null terminator Null carrier power.
In sum, the present invention gives the subchannel number of terminal by quantizing base station assigns, utilize power control instruction, test WiMAX terminal is in the dynamic range of using base station assigns to the transmitting power on the subchannel of its use, and whether assessment WiMAX terminal possesses channel gain characteristic.In implementation procedure, the present invention does not relate to using of special-purpose radio-frequency tester and the complexity of radio frequency signal power is measured, and is low to environmental requirement, easy to operation, promoted the efficient of test greatly.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the method for a testing terminal channel gain characteristic is characterized in that, comprising:
Step S102, confirm that terminal can access base station after, increase path loss, make the range finding failure of described terminal and described base station, with the uplink transmission power of described terminal at this moment as the reference power record;
Step S104, the bandwidth capacity of single up subchannel is calculated in described base station according to system configuration parameter;
Step S106 makes described terminal insert described base station by reducing path loss, the bandwidth capacity of the described single up subchannel that described base station calculates described terminal distribution;
Step S108, described base station is by improve the transmitting power of described terminal to described terminal transmitted power climb command, till described transmitting power can not improve, and will this moment the transmitting power of described terminal as measuring power trace; And
Step S110 compares described reference power and described measurement power, is under the situation about equating at described reference power and described measurement power comparing result, judges that described terminal possesses channel gain characteristic.
2. method according to claim 1 is characterized in that, in described step S106, described base station with first time domain after the mode of frequency domain initiatively distribute described bandwidth capacity frame by frame to described terminal.
3. according to each described method in the claim 1 to 2, it is characterized in that,, guarantee to have transfer of data between described terminal and the described base station at described step S102, described step S104, described step S106 and described step S108.
4. method according to claim 3 is characterized in that, in described step S106, described terminal utilize the packet under the described bandwidth capacity transmission specific modulation coded system to guarantee and the application server of described base station between have transfer of data.
5. method according to claim 4 is characterized in that, described specific modulation coded system is a quaternary PSK, and encoding rate is 1/2.
6. according to each described method in the claim 1 to 2, it is characterized in that described system parameters comprises at least: Fourier transform is counted, subchannel bias mode, up-downgoing symbol ratio.
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| CN2007101820328A CN101159516B (en) | 2007-10-24 | 2007-10-24 | Method of testing terminal channel gain characteristic |
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| CN2007101820328A CN101159516B (en) | 2007-10-24 | 2007-10-24 | Method of testing terminal channel gain characteristic |
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| CN101159516B true CN101159516B (en) | 2010-06-02 |
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| CN102917452B (en) * | 2011-08-02 | 2018-01-09 | 中兴通讯股份有限公司 | Access phase Poewr control method and device |
| CN106131942B (en) * | 2016-06-20 | 2020-08-21 | 边缘智能研究院南京有限公司 | Communication method and terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1698274A (en) * | 2002-07-30 | 2005-11-16 | 美商智慧财产授权股份有限公司 | System and method for multiple-input multiple-output (MIMO) radio communication |
| CN1949678A (en) * | 2005-10-12 | 2007-04-18 | 株式会社日立制作所 | Wireless data communication system, wireless data communication method and communication apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1698274A (en) * | 2002-07-30 | 2005-11-16 | 美商智慧财产授权股份有限公司 | System and method for multiple-input multiple-output (MIMO) radio communication |
| CN1949678A (en) * | 2005-10-12 | 2007-04-18 | 株式会社日立制作所 | Wireless data communication system, wireless data communication method and communication apparatus |
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