CN101039154A - Method for obtaining transceiver channel transmission time of user terminal - Google Patents
Method for obtaining transceiver channel transmission time of user terminal Download PDFInfo
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Abstract
The invention discloses a method for obtaining the user terminal transceiving channel transmission time. The physical layer of the user terminal is set to support loop back testing. The switch is set on the emission state by the user terminal. The transmitter channel and receiving channel are in working state at the same time. The transmitter channel of the user terminal sends IQ signal according to the timing reference of the physic layer and records the time which is relative to the time when the timing reference sends the IQ signal. The IQ signal, which is released from the switch, is received by the receiving channel and processed with a physical layer synchronous algorithm to obtain the time of the IQ signal which is relative to the timing reference. The user terminal transceiving channel transmission time is obtained by comparing the time when the IQ signal is sent with the time when the IQ signal is received. The invention obtains the accurate transceiving channel transmission time via the loop back testing on the user terminal, furthermore the time initial lead which is obtained by the user terminal by using the antenna aperture as the reference can be corrected via the transmission time.
Description
Technical field
The present invention relates to the AT speed test technology of the communications field, be meant a kind of user terminal receive channel transfer time method of obtaining especially.
Background technology
In time division duplex (TDD, Time Division Duplex) mobile communication system, to the uplink and downlink link all strict synchronously.User terminal enters from starting shooting in the process of idle pulley, has only set up down-going synchronous with the base station, this moment user terminal and do not know distance with the base station.In random access procedure, uplink synchronous has been set up in user terminal and base station, and promptly the base station requires the upward signal of the different user terminals transmission of different distance to arrive synchronously.For the TDD mobile communication system, uplink synchronous can be brought great benefit for communication system: because mobile communication system is to be operated in to have serious interference, in the actual environment of multipath transmisstion and Doppler effect, that may realize ideal hardly is synchronous, allow the main footpath of each upward signal reach synchronous, can guarantee the uncorrelated of upward signal, reduce the phase mutual interference of intersymbol, improve the performance of communication system, make capability of communication system improve greatly owing to the reduction of intersymbol interference, the complexity of base station receiver also greatly reduces simultaneously, has simplified the design of base station receiver.
In the TDD mobile communication system, owing to have propagation delay between base station and the user terminal, make the time of user terminal actual reception downstream signal always lag behind the time that does not have base station downstream signal under the propagation delay situation, realize uplink synchronous in order to compensate propagation delay, user terminal can be with the descending digital baseband signal received as timing base, the mode transmit uplink signal that the time of taking shifts to an earlier date.
For example, the code division multiple access synchronous in the time-division inserts (TD-SCDMA, TimeDivision-Synchronous Code Division Multiple Access) in the mobile communication system, user terminal is in the open loop phase of access network, its physical layer measures the Primary Common Control Physical Channel (P-CCPCH of this sub-district, Primary Common Control Physical Channel) received signal code power (RSCP, Received Signal Code Power) reports high level after, the P-CCPCH transmitting power that is disposed in the system message of the high level of user terminal according to P-CCPCH RSCP that receives and the base station broadcast of receiving, calculate path loss, roughly estimate distance between user terminal and the base station according to path loss and propagation loss formula then, like this, just can roughly obtain Timing Advance according to the distance that estimates.After user terminal obtains Timing Advance, begin to carry out access attempts at random with the Timing Advance of estimating, at forward physical access channel (FPACH, Front Physical Access Channel) in, the base station can be revised the Timing Advance of user terminal according to the position of the uplink synchronous code of receiving from user terminal (SYNC_UL), after user terminal enters closed loop phase, the base station can utilize command word control user terminal that Timing Advance is adjusted, and realizes the maintenance of uplink synchronous.
Fig. 1 shows the schematic diagram that concerns of Timing Advance and transceiver channel time delay, as shown in Figure 1, the process that user terminal obtains emission time initial lead all is to be benchmark with the antenna opening, but, be benchmark with the base band when employing time shifts to an earlier date the mode transmit uplink signal, but do not comprise the time delay that signal produces through radio frequency (RF) passage in this Timing Advance.
Like this, in the capable synchronous in realization process, be the descending digital baseband signal received with user terminal as timing base, rather than with the radiofrequency signal of user terminal antenna mouth as timing base, like this, if the time quantum that obtains with this time reference goes to convert the distance between propagation delay or Primary Location user terminal and the base station, because user terminal is not considered the influence of signal this transceiver channel time delay from the antenna opening to the digital baseband, cause consequently inaccurately, have bigger deviation.According to above description as seen, in order accurately to know the propagation delay between user terminal and the base station, must accurately obtain the transmission time of transceiver channel.
Fig. 2 shows the transceiver channel structural representation of TDD system wireless transceiver, as shown in Figure 2, transceiver channel comprises transmission channel and receive path, wherein, transmission channel comprises radio frequency delivery unit (RF_TxU), transmits filter (Tx Filter), power amplifier (PA, Power Amplifier) and antenna, receive path comprises rf receiver unit (RF_RxU), receiving filtration device (Rx Filter) and antenna, in addition, the effect of radio-frequency (RF) switch is to make antenna be switched to transmission channel and receive path respectively under time sequence control.Though can measure the transmission time of tested module at present by network analyzer, but the limitation that adopts network analyzer to measure the transmission time is that the input and output frequency of tested module must be identical, yet because the integrated level height of user terminal, for reducing the design objective of each device of user terminal, what receive path adopted is the zero intermediate frequency scheme, be receive path with the signal of the signal vanishing hertz received, like this, because variation has taken place in the frequency of the signal that transmits in the whole transceiver channel of user terminal, can't adopt network analyzer to measure the transmission time of whole transceiver channel at all.Because the integrated level of user terminal is very high, also can't adopt the transmission time of network analyzer independent measurement transmission channel, be that digital baseband signal behind analog baseband signal or the digital to analog converter (DAC) is to the transmission time between the radiofrequency signal, and the transmission time that can't adopt network analyzer independent measurement receive path, i.e. transmission time between the digital baseband signal of radiofrequency signal behind analog baseband signal or the analog to digital converter (ADC).
In addition, though can estimate the transmission time of user terminal receive passage by the transmission time index that the device data provides, but the transmission time that obtains in this way is very rough, can only adopt the method for compromise during estimation, and the transmission time of the transmission time that obtains when being not each device real work.If introduce the transmission time that printed wiring causes between each components and parts again, it is unusual difficult that estimation just becomes.
In sum, the transmission time that how accurately to obtain transceiver channel becomes a problem that presses for solution at present.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of user terminal receive channel transfer time method of obtaining, accurately obtain the transmission time of user terminal receive passage, and can further the transceiver channel transmission time of obtaining be used to calibrate the Timing Advance of user terminal to the base station upward signal.
In order to achieve the above object, the invention provides a kind of user terminal receive channel transfer time method of obtaining, the physical layer that user terminal is set is supported self-looped testing, and the method includes the steps of:
A, user terminal switch are set to emission state, transmission channel and receive path are simultaneously in running order, the transmission channel of user terminal sends homophase-quadrature IQ signal according to the timing base of physical layer, and record is with respect to the time of the transmission IQ signal of timing base;
The receive path of B, user terminal receives from switch and reveals the transmission IQ signal of coming, and the IQ signal is carried out the physical layer synchronization algorithm process, obtains the time of this IQ signal with respect to timing base;
C, the time and time that receives the IQ signal of described transmission IQ signal is compared, obtain the transmission time of user terminal receive passage.
The described physical layer that user terminal is set supports self-looped testing to be: the physical layer that the physical layer burning of user terminal is become to support self-looped testing; Or test module is set in user terminal, behind the startup test module, test module is arranged to physical layer to support the physical layer of self-looped testing.
Further comprise before the described steps A: user terminal is received test command; Or, precondition imposes a condition when satisfying.
Described step C is finished by the physical layer of user terminal; Or test machine is set, user terminal links to each other with test machine, further comprises before the described step C: user terminal reports the IQ signal of transmission and the IQ signal of receiving to test machine, and described step C is finished by test machine.
When test machine was set, described user terminal directly linked to each other with test machine or links to each other by test board.
Further comprise after the described step C: the physical layer that user terminal is set is the physical layer of normal operating condition.
The physical layer that the described physical layer that user terminal is set is a normal operating condition is: the physical layer that the physical layer burning of user terminal is become normal operating condition; Or test module is set in user terminal, close test module after, physical layer enters normal operating condition.
Further comprise after the described step C:
The transmission time of D, user terminal storage transceiver channel.
Further comprise after the described step D: when user terminal sends upward signal to the base station, with the user terminal receive channel transfer time with the antenna opening be the Timing Advance that obtains of benchmark and as revised Timing Advance, according to revised Timing Advance upward signal is handled, and sent upward signal to the base station.
According to the proposed method, by user terminal is carried out the transmission time that self-looped testing accurately obtains transceiver channel, for example in the TD-SCDMA system, the test accuracy in transmission time can reach 1/8 chip (chip) (1chip=0.78125 microsecond), and can be that the Timing Advance that benchmark obtains is revised with the antenna opening to user terminal further by this transmission time, user terminal sends upward signal according to revised Timing Advance to the base station, the base station is accurately located user terminal, reduced the error that the base station positions terminal widely.
Description of drawings
Fig. 1 shows the schematic diagram that concerns of Timing Advance and transceiver channel time delay;
Fig. 2 shows the transceiver channel structural representation;
Fig. 3 shows user terminal self-looped testing schematic diagram among the present invention;
Fig. 4 shows user terminal and production test platform annexation 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 accompanying drawing.
Among the present invention,, specific implementation step of the present invention is described in detail below in conjunction with Fig. 3 by user terminal is carried out the transmission time that self-looped testing obtains transceiver channel.
Step 1: the physical layer that user terminal to be tested is set is supported self-looped testing, for example, the physical layer burning of user terminal is become to support the physical layer of self-looped testing, or in user terminal, increase test module, after starting test module, test module is arranged to physical layer to support the physical layer of self-looped testing; Test program all can communicate with the physical layer of supporting self-looped testing.Self-looped testing is meant that the signal that user terminal sends himself receives again, can think that this user terminal has the dual-use function of base station and terminal.
Step 2: user terminal enters the self-looped testing stage, and the user terminal switch is set to emission state, and the transmission channel of this user terminal and receive path are simultaneously in running order.Can send test command as test platform, test machine etc. to user terminal by outside, so that user terminal enters the self-looped testing stage, user terminal enters the self-looped testing stage after receiving test command; Also can enter the self-looped testing stage, user terminal for example is set behind access network, enter the self-looped testing stage immediately or after the process setting-up time length according to imposing a condition.
Step 3: the transmission channel of user terminal sends homophase-quadrature (IQ, In-phase Quadrature) signal according to the timing base of physical layer, and writes down the time with respect to the transmission IQ signal of timing base, and the amplitude of this IQ signal is A
IQ_Tx
Step 4: the receive path of user terminal receives from switch and reveals the IQ signal of coming, and receives the IQ signal, and the amplitude of this IQ signal is A
IQ_Rx,, obtain the time of this IQ signal with respect to timing base by this IQ signal is carried out the physical layer synchronization algorithm process.
Step 5: the time of described user terminal transmission IQ signal and the time of user terminal reception IQ signal are compared, finally obtain the transmission time τ of user terminal receive passage
Tx-Rx
Step 6: after self-looped testing is finished, the physical layer of resetting user terminal is the physical layer of normal operating condition, for example, the physical layer burning of user terminal is become the normal physical layer version that uses, or close test module in the user terminal, the physical layer of user terminal enters normal operating condition.
In addition, can on basis shown in Figure 3, increase test machine, specifically referring to Fig. 4, if can't direct communication between user terminal and the test machine, then need test board that user terminal and test machine are coupled together,, then do not need test board if user terminal can direct communication.If increased test machine in the loopback test process, then user terminal reports the time that sends the IQ signal in the step 3 to test machine, user terminal reports the time of receiving the IQ signal to test machine in the step 4, is obtained the transmission time τ of user terminal receive passage in the step 5 by test machine
Tx-RxOr the direct completing steps of the physical layer of user terminal self-looped testing pattern three is to step 5, with the transmission time τ of the transceiver channel that calculates
Tx-RxReporting test machine gets final product.
Because the components and parts that the identical user terminal of model adopts are identical, therefore, only need choose a terminal and test and get final product; If further consider the nuance between the identical components and parts, can choose plural user terminal and test, according to each τ that obtains
Tx-RxFinally obtain the user terminal receive channel transfer time, and need not all terminals are all tested through overcorrect.
After obtaining the transmission time of user terminal receive passage, can be that the Timing Advance that benchmark obtains is revised with the antenna opening to user terminal by this transmission time, it is the storage transceiver channel transmission time in the user terminal, when user terminal sends upward signal to the base station, with the user terminal receive channel transfer time with the antenna opening be the Timing Advance that obtains of benchmark and as revised Timing Advance, transmission channel is handled upward signal according to revised Timing Advance, and send upward signal to the base station, i.e. transmission channel user terminal receive channel transfer time τ in advance again on the basis that with the antenna opening is the Timing Advance that obtains of benchmark
Tx-RxUpward signal is handled, can when upward signal is disposed, directly be opened transmission channel then, to this upward signal of base station; Also can be after upward signal be disposed, according to being the Timing Advance that benchmark obtains with the antenna opening, this Timing Advance is opened transmission channel in advance, to this upward signal of base station again.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (9)
1, a kind of user terminal receive channel transfer time method of obtaining is characterized in that, the physical layer that user terminal is set is supported self-looped testing, and the method includes the steps of:
A, user terminal switch are set to emission state, transmission channel and receive path are simultaneously in running order, the transmission channel of user terminal sends homophase-quadrature IQ signal according to the timing base of physical layer, and record is with respect to the time of the transmission IQ signal of timing base;
The receive path of B, user terminal receives from switch and reveals the transmission IQ signal of coming, and the IQ signal is carried out the physical layer synchronization algorithm process, obtains the time of this IQ signal with respect to timing base;
C, the time and time that receives the IQ signal of described transmission IQ signal is compared, obtain the transmission time of user terminal receive passage.
2, method according to claim 1 is characterized in that, the described physical layer that user terminal is set supports self-looped testing to be: the physical layer that the physical layer burning of user terminal is become to support self-looped testing; Or test module is set in user terminal, behind the startup test module, test module is arranged to physical layer to support the physical layer of self-looped testing.
3, method according to claim 1 is characterized in that, further comprise before the described steps A: user terminal is received test command; Or, precondition imposes a condition when satisfying.
4, method according to claim 1 is characterized in that, described step C is finished by the physical layer of user terminal; Or test machine is set, user terminal links to each other with test machine, further comprises before the described step C: user terminal reports the IQ signal of transmission and the IQ signal of receiving to test machine, and described step C is finished by test machine.
5, method according to claim 4 is characterized in that, when test machine was set, described user terminal directly linked to each other with test machine or links to each other by test board.
6, method according to claim 1 is characterized in that, further comprise after the described step C: the physical layer that user terminal is set is the physical layer of normal operating condition.
7, method according to claim 6 is characterized in that, the physical layer that the described physical layer that user terminal is set is a normal operating condition is: the physical layer that the physical layer burning of user terminal is become normal operating condition; Or test module is set in user terminal, close test module after, physical layer enters normal operating condition.
8, method according to claim 1 is characterized in that, further comprises after the described step C:
The transmission time of D, user terminal storage transceiver channel.
9, method according to claim 8, it is characterized in that, further comprise after the described step D: when user terminal sends upward signal to the base station, with the user terminal receive channel transfer time with the antenna opening be the Timing Advance that obtains of benchmark and as revised Timing Advance, according to revised Timing Advance upward signal is handled, and sent upward signal to the base station.
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Owner name: LIANXIN SCIENCE CO., LTD. Free format text: FORMER OWNER: DATANG MOBILE COMMUNICATION APPARATUS CO., LTD. Effective date: 20090508 |
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Effective date of registration: 20090508 Address after: Zip code, 4 building, 41 333 Qinjiang Road, Shanghai, China: 200233 Applicant after: Lian core technology Co., Ltd. Co-applicant after: Datang Mobile Communication Equipment Co., Ltd. Co-applicant after: Datang Mobile Communication Equipment Co., Ltd., Shanghai Address before: Postal code 29, Haidian District, Beijing, Xueyuan Road: 100083 Applicant before: Datang Mobile Communications Equipment Co Co-applicant before: Datang Mobile Communication Equipment Co., Ltd., Shanghai |
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Address after: 201206 Pudong New Area Mingyue Road, Shanghai, No. 1258 Co-patentee after: Datang Mobile Communication Equipment Co., Ltd. Patentee after: Leadcore Technology Co., Ltd. Co-patentee after: Datang Mobile Communication Equipment Co., Ltd., Shanghai Address before: 200233 Shanghai, Jiang Road, No. 41, building 4, building 333 Co-patentee before: Datang Mobile Communication Equipment Co., Ltd. Patentee before: Leadcore Technology Co., Ltd. Co-patentee before: Datang Mobile Communication Equipment Co., Ltd., Shanghai |
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Free format text: FORMER OWNER: DATANG MOBILE COMMUNICATION EQUIPMENT CO., LTD. DATANG MOBILE COMMUNICATION EQUIPMENTCO., LTD., SHANGHAI Effective date: 20120129 |
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Effective date of registration: 20120129 Address after: 201206 Pudong New Area Mingyue Road, Shanghai, No. 1258 Patentee after: Leadcore Technology Co., Ltd. Address before: 201206 Pudong New Area Mingyue Road, Shanghai, No. 1258 Co-patentee before: Datang Mobile Communication Equipment Co., Ltd. Patentee before: Leadcore Technology Co., Ltd. Co-patentee before: Datang Mobile Communication Equipment Co., Ltd., Shanghai |