CN101415271B - Receive gain control method for GSM/TD-SCDMA double-mode terminal - Google Patents
Receive gain control method for GSM/TD-SCDMA double-mode terminal Download PDFInfo
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- CN101415271B CN101415271B CN2008102279396A CN200810227939A CN101415271B CN 101415271 B CN101415271 B CN 101415271B CN 2008102279396 A CN2008102279396 A CN 2008102279396A CN 200810227939 A CN200810227939 A CN 200810227939A CN 101415271 B CN101415271 B CN 101415271B
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Abstract
The invention provides a method for controlling receiving gains of a GSM/TD-SCDMA bimodal terminal. The method comprises the following steps: A. N receiving gains covering the signal receiving range of a TD-SCDMA system are preset; B. one of the N receiving gains is successively selected for receiving and synchronizing data for a plot on a primarily measured frequency point, and the value of a synchronous counter is increased by 1 on each synchronization until the synchronization is successful to enter the step C, or the measurement of the frequency point is given up when the value of the synchronous counter is N and the synchronization is not successful; C. an expected receiving gain is calculated according to the received data to decide whether the absolute value of the difference between a currently used receiving gain and the expected receiving gain is within the preset range. If yes, RSCP measurement is carried out, the measured result is reported, and the synchronous counter is reset; if no, the RSCP measurement is not carried out. According to the receiving gain control method, the accurate control on the receiving gain can be realized. Therefore, the measurement efficiencyis improved and the measurement precision is guaranteed.
Description
Technical field
The invention belongs to the communications field, particularly a kind of in the automatic dual-mode terminal of GSM/TD-SCDMA system, when dual-mode terminal is operated under the GSM pattern when TD-SCDMA network measured the control method of terminal receiving gain.
Background technology
Under the multiple mobile communications network and the situation of depositing, concerning terminal, support that automatic bimodulus or multimode are extremely important.
GSM/TD-SCDMA (global system for mobile communications/TDS-CDMA system) is dual-mode terminal automatically, be meant that a terminal supports GSM and two kinds of network schemers of TD-SCDMA simultaneously, it can make a choice automatically according to environment and business demand, which network can provide better service and service quality, and just automatic switchover or gravity treatment are under that network schemer.In order to realize automatic switchover and the sub-district gravity treatment between the bimodulus, terminal is an important assurance to the accurate measurement of another pattern in one mode.For automatic dual-mode terminal, if terminal is operated under the TD-SCDMA network schemer usually, the RSSI (indication of received signal intensity) that needs monitoring GSM network, if terminal works under the GSM network schemer, need be measured the RSSI and the RSCP (received signal code power) of TD-SCDMA network.
Definition according to the TD-SCDMA standard, the scope of TD-SCDMA received signal is [108dBm,-25dBm], reach the dynamic range of 83dB, and the dynamic range of rear end ADC (analogue-to-digital converters) conversion is usually less than this scope, in order to guarantee the quality of ADC output signal, need carry out gain controlling to the received signal usually.The radio-frequency transmitter of TD-SCDMA all has the amplifier of gain-variable usually, and Amplifier Gain need be adjusted automatically according to the power of received signal, and this process is called AGC (automatic gain control) process usually.
For the automatic dual-mode terminal of GSM/TD-SCDMA, when terminal works at gsm system, when the TD-SCDMA system cell is measured, need at first obtain the frame synchronization of TD-SCDMA to be measured system usually, obtain testing data according to synchronizing information, and then measure.In this process, the adjustment strategy of AGC is very important, because under the wireless channel environment of reality, the intensity of signal is along with terminal becomes when the decline of the distance of base station and wireless channel.In case the variation of gain does not catch up with the variation of signal power, will can not get guaranteeing with the performance of measuring synchronously.And in the measuring process of reality, the blanking time of measuring period may be long, and so the power of Chang time interval wireless signal may have bigger variation, and is improper if AGC adjusts strategy, can cause follow-up synchronous and measurement mistake.
Summary of the invention
Technical problem to be solved by this invention provides a kind of receiving gain control method of GSM/TD-SCDMA dual-mode terminal, being applicable to that described dual-mode terminal is operated under the GSM pattern measures the TD-SCDMA network, receive the accurate control of gain to achieve a butt joint, and then the raising efficiency of measurement, guarantee certainty of measurement.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of receiving gain control method of GSM/TD-SCDMA dual-mode terminal is applicable to that described dual-mode terminal is operated under the GSM pattern TD-SCDMA network measured, and comprises the steps:
A, default N the receiving gain that covers the received signal scope of TD-SCDMA system, N is the integer greater than 1, and an initial value is set is zero coincidence counter;
B, for the sub-district on the first measurement frequency, select one in the described N receiving gain to receive data and carry out synchronous successively, whenever carry out one subsynchronous, the value of coincidence counter is increased by 1, up to the synchronous step C that enters when successful, perhaps, the value of coincidence counter is N and the measurement of also abandoning synchronously this frequency during success;
C, according to receiving data computation expectation receiving gain, the receiving gain of judging current use and the absolute value of the difference of expectation receiving gain whether in preset range, if, carry out RSCP and measure, the reporting measurement result, and with the coincidence counter zero clearing, otherwise this does not carry out RSCP and measures.
Above-mentioned method wherein, also comprises after the step C:
D, judge whether the value of coincidence counter is N, if, abandon the measurement of this frequency, otherwise, step e entered;
E, receive data and carry out synchronously, the value of coincidence counter is increased by 1, and when success synchronously, return step C, enter step F during synchronization failure with described expectation receiving gain;
F, judge whether synchronized counter value is N, if, abandon the measurement of this frequency, otherwise, step G entered;
G, select in described default N the receiving gain one to receive data successively and carry out synchronously, whenever carry out one subsynchronously, the value of coincidence counter is increased by 1, up to the synchronous step C that returns when successful, perhaps, the value of coincidence counter is N and the measurement of also abandoning synchronously this frequency during success.
Above-mentioned method, in the steps A, a described N receiving gain obtains by emulation or test.
Above-mentioned method among the step C, describedly specifically comprises according to receiving data computation expectation receiving gain:
Set the received power desired value of the reception data on the time slot TS0;
Calculate the power of the data on the TS0 that receives;
Calculate the TS0 that receives and go up the power of data and the difference of received power desired value, obtain amount of gain adjustment;
Deduct described amount of gain adjustment with current receiving gain and obtain expecting receiving gain.
Above-mentioned method, among the step C, described preset range obtains by emulation or test.
Above-mentioned method wherein, obtains described preset range by test and specifically comprises:
To connect by cable between signal source and the receiver;
Signal source sends the TD-SCDMA data, and TS0 is last only to send data on preceding two code channels;
Receiver receives data, and obtains the actual reception power P of receiver antenna port by tester;
Set different receiving gains one by one, and carry out RSCP and measure;
Find the receiving gain scope [G1, G2] that meets RSCP measure error area requirement;
Look into the receiving gain G0 that the receiving gain calibration chart obtains received power P correspondence, with [T1, T2] as described preset range, T1=G1-G0 wherein, T2=G2-G0.
Above-mentioned method, wherein, in the idle condition of GSM, and last time slot of the idle frame under the gsm service state and the previous frame of this idle frame carries out the reception of TD-SCDMA data.
Compared with prior art, the present invention comes the calculation expectation receiving gain according to receiving data, whether the absolute value of the receiving gain by judging current use and the difference of expectation receiving gain is in preset range, whether the receiving gain of determining current use meets the demands, and then determines whether that need carry out RSCP at this measures and report.Further, when measuring the next time of this frequency, the expectation receiving gain that adopted obtained last time receives data and carries out synchronously.So, can improve efficiency of measurement, guarantee certainty of measurement.
Description of drawings
Fig. 1 is gsm service channel 26 frame multi-frame structure figure;
Fig. 2 is TD-SCDMA subframe structure figure;
Fig. 3 is a receiving gain control method flow chart of the present invention;
Fig. 4 is a specific embodiment flow chart of receiving gain control method of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Fig. 1 has described the multi-frame structure figure of Traffic Channel among the GSM, and Traffic Channel is used the multi-frame structure of 26 subframes, the length overall 120ms of multi-frame among the GSM.An idle frame (seeing the Idle frame among the figure) is all arranged in per 26 subframes.The frame length of GSM is 4.615 milliseconds of ≈ (120/26 millisecond), and the frame of a GSM comprises 8 basic time slots, and a time slot accounts for the 4.615/8=0.577 millisecond.
Fig. 2 has described the subframe structure figure of TD-SCDMA; each subframe length of TD-SCDMA is 5 milliseconds; comprise 7 business time-slots; a descending pilot frequency time slot; a protection time slot; with a uplink pilot time slot, the descending synchronous code that terminal can utilize descending pilot frequency time slot to comprise finds sync bit, and BCH (broadcast channel) is always by preceding two code channels carrying on the TS0.
Portable terminal is under different GSM mode of operation, data rate and configuring conditions, and the GSM mode wireless resource that takies is different.But whatsoever under the situation, at last time slot of the previous frame of GSM idle frame and this idle frame, be the transmitting-receiving that does not need to carry out GSM mode wireless data, length is 9/8*4.615 millisecond=5.19 millisecond.This part can be used for the reception of TD-SCDMA system cell signal, portable terminal can receive the data of a complete TD-SCDMA system subframe (5 milliseconds of length) like this, comprise P-CCPCH (Primary Common Control Physical Channel) data and descending pilot frequency code data on the time slot 0 (TS0) that needs in the measurement, according to the measurement of these data realizations to this TD-SCDMA system cell.Among the present invention, in the idle condition of GSM, and last time slot of the idle frame under the gsm service state and the previous frame of this idle frame all can carry out the reception of TD-SCDMA data.
Measurement under the bimodulus generally needs two processes: synchronously and measure, need do synchronously receiving data earlier, obtain measuring required data segment, could utilize then this data segment calculate need measuring amount.The received signal scope of TD-SCDMA system is very big, be [108dBm ,-25dBm], and the signal of input analogue-to-digital converters (ADC) must drop on and could guarantee in certain scope synchronously and the performance of measurement, so receiving gain to control be very important.
On the one hand, signal drops on and could guarantee in certain scope synchronous accurately, and this scope depends on the dynamic range that applied analogue-to-digital converters can provide and the performance of synchronized algorithm; On the other hand, guarantee success synchronously and measure range of signal possibility and inequality accurately that after the success, measurement result is also not necessarily accurate synchronously.Therefore need to introduce corresponding gain controlling strategy and guarantee synchronous success rate, and the accuracy of the measurement on synchronous basis.
With reference to Fig. 3, the invention provides a kind of receiving gain control method of GSM/TD-SCDMA dual-mode terminal, be applicable to that described dual-mode terminal is operated under the GSM pattern TD-SCDMA network measured, comprise the steps:
Step 301: default N the receiving gain that covers the received signal scope of TD-SCDMA system, N is the integer greater than 1, and an initial value is set is zero coincidence counter;
Step 302: for the sub-district on the first measurement frequency, select one in the described N receiving gain to receive data and carry out synchronous successively, whenever carry out one subsynchronous, the value of coincidence counter is increased by 1, up to the synchronous step 303 that enters when successful, perhaps, the value of coincidence counter is N and the measurement of also abandoning synchronously this frequency during success;
Step 303: according to receiving data computation expectation receiving gain, whether the absolute value of the receiving gain of judging current use and the difference of expectation receiving gain is in preset range, if, carrying out RSCP measures, the reporting measurement result, and with the coincidence counter zero clearing, otherwise this does not carry out RSCP and measures.
With reference to Fig. 4, the receiving gain control method of the GSM/TD-SCDMA dual-mode terminal of the embodiment of the invention is applicable to that described dual-mode terminal is operated under the GSM pattern TD-SCDMA network measured, and comprises the steps:
Step 401: default N the receiving gain that covers the received signal scope of TD-SCDMA system, N is the integer greater than 1;
For a first sub-district of measuring on the frequency, because there is not prior information, do not know the power bracket of this sub-district, at first consider to select N fixing receiving gain G
i, i=1 ..., N, G
iCan obtain by actual emulation or test.
Step 402: a coincidence counter is set, and with this coincidence counter zero clearing;
Coincidence counter is used for the number of times of synchronizing process is counted.In the present invention, in case synchronizing process has been carried out N time, if also not success synchronously, perhaps, though not in preset range, then thinking, success synchronously, the absolute value of the receiving gain of current use and the difference of expecting receiving gain do not have the sub-district on this frequency, abandon the measurement of this frequency, change the measurement of next frequency over to.
Particularly, in step 403, make i=1; In step 404, select G
iReceive data and carry out synchronously, the value of coincidence counter is increased by 1; In step 405, whether judgement is successful synchronously, if, enter step 409, otherwise, step 406 entered; In step 406, judge whether the value of coincidence counter is N, if, enter step 407, otherwise, step 408 entered; In step 407, abandon the measurement of sub-district on this frequency, (that is, beginning to carry out from step 402 again) measured in the sub-district that forwards on the next frequency; In step 408, return step 404 after the value increase by 1 with i.
Step 409: according to receiving data computation expectation receiving gain;
After the success,, can obtain the reception data on the TS0 (time slot 0) synchronously according to the subframe structure of synchronizing information and TD-SCDMA system.At first set the received power desired value of the reception data on the TS0, calculate the power of the data on the TS0 that receives, calculate TS0 then and go up the power of data and the difference of received power desired value, obtain amount of gain adjustment, deduct described amount of gain adjustment with current receiving gain at last and obtain expecting receiving gain.Preserve this expectation receiving gain, when measurement next time of this frequency, receive data with this expectation receiving gain.
Utilize reception data on the TS0 to calculate RSCP on the P-CCPCH (Primary Common Control Physical Channel), this RSCP is the go forward sign indicating number power of two code channels of TS0.Synchronizing process is carried out on descending pilot frequency time slot (DwPTS), and the measurement of RSCP is to obtain on TS0, have difference power between DwPTS and the TS0, this difference power is relevant for the power configuration of these two time slots with network segment, and is also relevant with total code channel number of the last measurement period of TS0.Under synchronous case of successful, because accurately measuring needed reception data amplitude scope, RSCP is different from the required data amplitude scope of synchronous success, also might can not get RSCP result accurately.
Therefore, whether the absolute value of the present invention by the receiving gain of judging current use and the difference of expecting receiving gain be in preset range, whether the receiving gain of determining current use meets the demands, and then determines whether that need carry out RSCP at this measures and report.
Described preset range can obtain by test or method of emulation, is that example describes to obtain preset range by method of testing below: signal source is connected by cable with terminal receiver; Signal source sends the TD-SCDMA data, and TS0 is last only to send data on preceding two code channels, and at this moment the time slot power on the TS0 equates with RSCP; Receiver receives data, obtains the actual reception power P of receiver antenna port by tester; Set different receiver gain values then one by one, and carry out RSCP and measure; Find the receiving gain scope [G1, G2] that meets RSCP measure error area requirement; Look into the receiving gain G0 that the receiving gain calibration chart can obtain received power P correspondence, just can obtain described preset range: [T1, T2], T1=G1-G0 wherein, T2=G2-G0.
In the actual measurement process, after correctly obtaining synchronizing information, obtain reception data on the TS0 according to the frame structure of TD-SCDMA, at first can calculate the power of the reception data on the TS0, calculate receiving gain (promptly the expecting receiving gain) G on the TS0 then
NewWith receiving the used gain G of these frame data
CurrentDeduct G
NewObtain difference DELTA G=G
Current-G
NewJudge Δ G then whether in preset range [T1, T2], if, then carry out the measuring process of step 412, otherwise, think that calculating RSCP result under this gain can not satisfy the certainty of measurement requirement, this does not carry out RSCP measures, measurement result newspaper invalid value.
Step 412: carry out RSCP and measure, the reporting measurement result, and with the coincidence counter zero clearing;
Utilize reception data on the TS0 to calculate RSCP on the P-CCPCH, this RSCP is the go forward sign indicating number power of two code channels of TS0.
Step 413～414: whether the value of judging coincidence counter is N, if, abandon the measurement of this frequency, otherwise, step 415 entered;
When the value of coincidence counter is N, illustrate synchronously and carried out N time, but, also not success synchronously, perhaps, though success synchronously, but the absolute value of the difference of the receiving gain of current use and expectation receiving gain is not in preset range, then think not have the sub-district on this frequency, abandon the measurement of this frequency, change the measurement of next frequency over to.
Step 415: receive data and carry out synchronously with described expectation receiving gain, the value of coincidence counter is increased by 1;
Carry out this step, illustrate and achieve success synchronously when received data last time, it is corresponding to two kinds of situations, situation 1: carried out RSCP last time and measured; Situation 2: do not carry out RSCP and measure because receiving gain does not meet the demands last time.Which kind of situation no matter, the present invention adopts gain adjustment result (promptly the expecting receiving gain) G that measured last time
NewReceive this measurement data.
Step 416: whether judgement is successful synchronously, if, return step 409, otherwise, step 417 entered;
Step 417～418: judge whether synchronized counter value is N, if, abandon the measurement of this frequency, otherwise, step 419 entered;
Step 419～422: select in described default N the receiving gain one to receive data successively and carry out synchronously, whenever carry out one subsynchronous, the value of coincidence counter is increased by 1, up to the synchronous step 409 of returning when successful, perhaps, the value of coincidence counter is N and the measurement of also abandoning synchronously this frequency during success.
In sum, the present invention comes the calculation expectation receiving gain according to receiving data, whether the absolute value of the receiving gain by judging current use and the difference of expectation receiving gain is in preset range, whether the receiving gain of determining current use meets the demands, and then determines whether that need carry out RSCP at this measures and report.Further, when measuring the next time of this frequency, the expectation receiving gain that adopted obtained last time receives data and carries out synchronously.So, can improve efficiency of measurement, guarantee certainty of measurement.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. the receiving gain control method of a GSM/TD-SCDMA dual-mode terminal is applicable to that described dual-mode terminal is operated under the GSM pattern TD-SCDMA network measured, and it is characterized in that, comprises the steps:
A, default N the receiving gain that covers the received signal scope of TD-SCDMA system, N is the integer greater than 1, and an initial value is set is zero coincidence counter;
B, for the sub-district on the first measurement frequency, select one in the described N receiving gain to receive data and carry out synchronous successively, whenever carry out one subsynchronous, the value of coincidence counter is increased by 1, up to the synchronous step C that enters when successful, perhaps, the value of coincidence counter is N and the measurement of also abandoning synchronously this frequency during success;
C, according to receiving data computation expectation receiving gain, whether the absolute value of the receiving gain of judging current use and the difference of expectation receiving gain is in preset range, if, carrying out received signal code power RSCP measures, the reporting measurement result, and with the coincidence counter zero clearing, otherwise this does not carry out RSCP and measures.
2. the method for claim 1 is characterized in that, also comprises after the step C:
D, judge whether the value of coincidence counter is N, if, abandon the measurement of this frequency, otherwise, step e entered;
E, receive data and carry out synchronously, the value of coincidence counter is increased by 1, and when success synchronously, return step C, enter step F during synchronization failure with described expectation receiving gain;
F, judge whether synchronized counter value is N, if, abandon the measurement of this frequency, otherwise, step G entered;
G, select in described default N the receiving gain one to receive data successively and carry out synchronously, whenever carry out one subsynchronously, the value of coincidence counter is increased by 1, up to the synchronous step C that returns when successful, perhaps, the value of coincidence counter is N and the measurement of also abandoning synchronously this frequency during success.
3. method as claimed in claim 1 or 2 is characterized in that:
In the steps A, a described N receiving gain obtains by emulation or test.
4. method as claimed in claim 1 or 2 is characterized in that, among the step C, describedly specifically comprises according to receiving data computation expectation receiving gain:
Set the received power desired value of the reception data on the time slot TS0;
Calculate the power of the data on the TS0 that receives;
Calculate the TS0 that receives and go up the power of data and the difference of received power desired value, obtain amount of gain adjustment;
Deduct described amount of gain adjustment with current receiving gain and obtain expecting receiving gain.
5. method as claimed in claim 1 or 2 is characterized in that:
Among the step C, described preset range obtains by emulation or test.
6. method as claimed in claim 5 is characterized in that, obtains described preset range by test and specifically comprises:
To connect by cable between signal source and the receiver;
Signal source sends the TD-SCDMA data, and TS0 is last only to send data on preceding two code channels;
Receiver receives data, and obtains the actual reception power P of receiver antenna port by tester;
Set different receiving gains one by one, and carry out RSCP and measure;
Find the receiving gain scope [G1, G2] that meets RSCP measure error area requirement;
Look into the receiving gain G0 that the receiving gain calibration chart obtains received power P correspondence, with [T1, T2] as described preset range, T1=G1-G0 wherein, T2=G2-G0.
7. method as claimed in claim 1 or 2 is characterized in that:
In the idle condition of GSM, and last time slot of the idle frame under the gsm service state and the previous frame of this idle frame carries out the reception of TD-SCDMA data.
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| CN117580143B (en) * | 2024-01-15 | 2024-03-22 | 南京思宇电气技术有限公司 | Automatic gain control method and system based on dual-mode communication unit |
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| CN101087440A (en) * | 2006-06-06 | 2007-12-12 | 大唐移动通信设备有限公司 | A method for data adjustment in mobile communication system |
| CN101159964A (en) * | 2007-11-19 | 2008-04-09 | 北京天碁科技有限公司 | Measurement scheduling method and multimode terminal of multimode terminal |
| CN101227737A (en) * | 2008-02-03 | 2008-07-23 | 北京天碁科技有限公司 | Method for switching double module mobile terminal from GSM to TD-SCDMA |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101087440A (en) * | 2006-06-06 | 2007-12-12 | 大唐移动通信设备有限公司 | A method for data adjustment in mobile communication system |
| CN101159964A (en) * | 2007-11-19 | 2008-04-09 | 北京天碁科技有限公司 | Measurement scheduling method and multimode terminal of multimode terminal |
| CN101227737A (en) * | 2008-02-03 | 2008-07-23 | 北京天碁科技有限公司 | Method for switching double module mobile terminal from GSM to TD-SCDMA |
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