CN103379602B - Terminal auto gain control method under downlink multi-slot business and terminal - Google Patents

Terminal auto gain control method under downlink multi-slot business and terminal Download PDF

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CN103379602B
CN103379602B CN201210106860.4A CN201210106860A CN103379602B CN 103379602 B CN103379602 B CN 103379602B CN 201210106860 A CN201210106860 A CN 201210106860A CN 103379602 B CN103379602 B CN 103379602B
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agc
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CN103379602A (en
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刘洪波
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Leadcore Technology Co Ltd
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Leadcore Technology Co Ltd
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Abstract

The present invention relates to wireless communication field, disclose the terminal auto gain control method under a kind of downlink multi-slot business and terminal.In the present invention, for each descending time slot of present sub-frame, terminal, according to the transformat combination instruction TFCI carried in subframe, judges the downstream signal whether this descending time slot existing this terminal corresponding; If this descending time slot does not exist described downstream signal, then terminal is according to the backup value AGC of the automatic growth control AGC gain of setting backup, obtain the AGC gain value AGC of this descending time slot corresponding in next subframe next; If this descending time slot exists described downstream signal, then terminal is according to the current AGC gain value of this descending time slot and AGC adjustment amount, obtains described AGC next, the reception saturated phenomenon making the present invention can tackle the lower discontinuous transmitting of non-first time slot of descending multi-slot configuration to cause, guarantees the correct reception of terminal to downstream signal.

Description

Terminal auto gain control method under downlink multi-slot business and terminal
Technical field
The present invention relates to wireless communication field, the terminal auto gain control method particularly in a kind of radio communication under downlink multi-slot business and terminal.
Background technology
In radio communication, due to the mobility of terminal and the complexity of wireless channel, the signal strength signal intensity that terminal can be made to receive constantly changes.This just requires that terminal adjusts the gain of receiving unit in real time, makes the reception I/Q signal being input to baseband processor be a constant value, facilitates the process of baseband processor.In traditional TD-SCDMA automatic gaining controling algorithm, the automatic growth control (AutomaticGainControl is called for short " AGC ") of each descending time slot carries out respectively, as shown in Figure 1:
First, the desired value (RSSI of descending received signal strength is set target);
Secondly, for each descending time slot, the automatic growth control module of terminal calculates received signal strength (ReceivingSignalStrengthIndicator is called for short " RSSI "); Wherein the computational methods of RSSI are the known technology of those skilled in that art, do not specifically describe herein;
Then, received signal strength will be calculated and default desired value compares, according to the adjustment amount (AGC of comparative result determination AGC gain step); Wherein adjustment amount can be fixed step size, also can be variable step size, and with fixed step size citing, adjustment amount is fixed really, is:
A) fixed step size of note Gain tuning is FixedStep, wherein FixedStep > 0;
If b) RSSI is less than or equal to RSSI target, then adjustment amount AGC stepfor fixed step size, i.e. AGC step=FixedStep;
If c) RSSI is greater than RSSI target, then adjustment amount AGC stepfor the negative value of fixed step size, i.e. AGCstep=-FixedStep.
Finally, according to the AGC gain value (AGC of this descending time slot of present sub-frame current) and previous step obtain AGC gain value adjustment amount, generate the gain of received signal (AGC of the same descending time slot of corresponding next subframe next), control the Signal reception of the corresponding descending time slot of next subframe; Wherein AGC next=AGC current+ AGC step.
For the Packet Service passing through business, particularly two-forty that down physical channel (DPCH) carries in TD-SCDMA system, multiple descending time slot may be there is in same subframe.When instantaneous service rate is lower than Radio Resource (RU) that distribute, the method of through-rate coupling, the Radio Resource number of physical channels being actually used in transmission can be determined, discontinuous transmitting (DTX) will be adopted for untapped Radio Resource.Wherein the method for rate-matched is see 3GPP specification 25.222, and the method for discontinuous transmitting, see 3GPP specification 25.224, is the known technology of those skilled in that art, does not specifically describe herein.For being assigned with the business of multiple descending time slot, the possibility of result of rate-matched has following three kinds of situations:
In the descending time slot of a) all distribution, Radio Resource is all had to be used; Namely, in all descending time slots that this user terminal distributes, the downstream signal all existed for this user terminal is launched.
In the descending time slot of b) all distribution, Radio Resource is not had to be used; Now according to the method for DTX, only in first business time-slot that this user terminal is descending, launch special burst (SpecialBurst), other descending time slots are not launched for the downstream signal of this user terminal.
In the descending time slot of c) all distribution, only have the Radio Resource of partial time slot to be used, the Radio Resource remaining other time slots is not used; Now according to the method for DTX, there is no Radio Resource by the descending time slot used, launching there is no the downstream signal of this user.
Can find out, for terminal, may there is the situation of not launching this subscriber signal in descending non-first time slot.
When there is not the downstream signal transmitting for this user in the descending time slot that user terminal distributes, according to traditional auto gain control method, the RSSI result of calculation that there is not signal transmission time slot will be very little, and the AGC gain of corresponding time slot can be caused like this to be adjusted increase.When the momentary rate of business is continuously lower than nominal rate, there is not the non-first time slot A GC yield value that signal launches will by lifting step by step, becomes a larger gain; Now once momentary rate becomes large, when the descending time slot originally do not launched recovers downstream signal transmitting, because the yield value of its correspondence is bigger than normal, the saturated of Received signal strength may be caused, affect the proper solution mediation decoding of downstream signal, cause the deterioration of receptivity.
Summary of the invention
The object of the present invention is to provide the terminal auto gain control method under a kind of downlink multi-slot business and terminal, make terminal under multislot services, the AGC gain value being suitable for receiving business time-slot can be obtained, thus the AGC gain that can correctly process when descending non-first business time-slot no signal is launched controls, there is receiving saturated problem in the discontinuous transmitting of non-first time slot produced due to momentary rate fluctuation under descending multi-slot configures under solving existing method, guarantees the correct reception of terminal to downstream signal.
For solving the problems of the technologies described above, embodiments of the present invention provide the terminal auto gain control method under a kind of downlink multi-slot business, comprise following steps:
For each descending time slot of present sub-frame, terminal, according to the transformat combination instruction TFCI carried in subframe, judges the downstream signal whether this descending time slot existing this terminal corresponding;
If this descending time slot does not exist described downstream signal, then terminal is according to the backup value AGC of the automatic growth control AGC gain of setting backup, obtain the AGC gain value AGC of this descending time slot corresponding in next subframe next;
If this descending time slot exists described downstream signal, then terminal is according to the current AGC gain value of this descending time slot and AGC adjustment amount, obtains described AGC next.
Embodiments of the present invention additionally provide a kind of terminal, comprise:
Resource occupation judge module, for each descending time slot for present sub-frame, according to the transformat combination instruction TFCI carried in subframe, judges the downstream signal whether this descending time slot existing this terminal corresponding;
First yield value acquisition module, during for judging this descending time slot not to exist described downstream signal at described resource occupation judge module, according to the backup value AGC of the automatic growth control AGC gain of setting backup, obtain the AGC gain value AGC of this descending time slot corresponding in next subframe next;
Second yield value acquisition module, for when described resource occupation judge module judges this descending time slot to exist described downstream signal, according to current AGC gain value and the AGC adjustment amount of this descending time slot, obtains described AGC next.
Owing to DPCH carrying transformat combination instruction (TFCI), according to TFCI, actual Radio Resource can be calculated under this TFCI and takies situation, also just can judge, in each of the lower on row time slot, whether to there is the downstream signal of this user terminal corresponding; And the downstream signal of this user terminal corresponding whether is there is according to this descending time slot, calculate the AGC gain value AGC of the same descending time slot of next subframe respectively next.During owing to there is not described downstream signal on this descending time slot, terminal is by the backup value AGC of the AGC gain according to setting backup, obtain the AGC gain value AGC of same descending time slot in next subframe next, and the current AGC gain value of not according to and AGC adjustment amount, obtain this AGC next.Therefore, in terms of existing technologies, the reception saturated phenomenon that the discontinuous transmitting of non-first time slot produced due to momentary rate fluctuation under can tackling the configuration of descending multi-slot causes, guarantees the correct reception of terminal to downstream signal to embodiment of the present invention.
Preferably, at the AGC according to setting backup, obtain described AGC nexttime, according to the variable quantity of received power on beacon channel, to described AGC backupcarry out correction-compensation, and using the value after correction-compensation as described AGC next.Due to when the discontinuous transmitting of descending non-first business time-slot, radio propagation channel is still in the middle of change, now can according to the situation of change of received power on beacon channel in TD-SCDMA system, the i.e. situation of change of path loss, AGC gain value is compensated, adapts to the change of wireless channel further.
Preferably, the AGC of described setting backupcan be the AGC of this descending time slot of correspondence calculated in the end subframe in the upper once minimum transfer time interval next.With the AGC of this descending time slot of correspondence calculated in the end subframe in the last minimum transfer time interval next, as the AGC of setting backup, further ensure that according to this AGC backupthis AGC obtained nextaccuracy.
Preferably, the AGC of described setting backupalso can be the empirical value preset, or be this descending time slot recently AGC gain value of using of correct Received signal strength.Embodiments of the present invention can be realized according to the actual requirements flexible and changeablely.
Preferably, after this descending time slot of judgement does not exist described downstream signal, whether there is the correct transmission block of decoding cyclic redundancy check (CRC) according in current minimum transfer time interval TTI, judge that whether described TFCI is credible; Wherein, if there is the correct transmission block of decoding CRC, then judge that described TFCI is credible; If there is no the transmission block that decoding CRC is correct, then judge that described TFCI is insincere.If it is determined that described TFCI is credible, then perform the described AGC according to setting again backup, obtain described AGC nextstep; If it is determined that described TFCI is insincere, then forbid performing the described AGC according to setting backup, obtain described AGC nextstep, terminal, according to the current AGC gain value of this descending time slot and AGC adjustment amount, obtains described AGC next.Due in the transmitting procedure of wireless signal, the propagation of TFCI symbol may be subject to various interference and destroyedly cause the result of TFCI decoding insincere; The result of data division CRC check now can be utilized to do further examination, if it is correct to there is at least one transmission block CRC in the CRC check result of data division, so the decode results of TFCI is reliable, and the Radio Resource calculated according to TFCI takies situation and also can accept and believe.By detecting the reliability of TFCI decode results, further ensure that the correct reception of terminal to downstream signal.
Accompanying drawing explanation
Fig. 1 is TD-SCDMA auto gain control method flow chart in prior art;
Fig. 2 is the flow chart of auto gain control method according to first embodiment of the invention;
Fig. 3 is the flow chart of auto gain control method second embodiment of the invention;
Fig. 4 is the structure chart of the terminal according to the 4th execution mode of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.But, persons of ordinary skill in the art may appreciate that in each execution mode of the present invention, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following execution mode and amendment, each claim of the application technical scheme required for protection also can be realized.
First execution mode of the present invention relates to the terminal auto gain control method under a kind of downlink multi-slot business, in the present embodiment, for each descending time slot of present sub-frame, terminal is according to the transformat combination instruction (TransportFormatCombinationIndicator carried in subframe, be called for short " TFCI "), judge the downstream signal whether this descending time slot existing this terminal corresponding; If this descending time slot does not exist the downstream signal of this terminal corresponding, then terminal is according to the backup value AGC of the automatic growth control AGC gain of setting backup, obtain the AGC gain value AGC of this descending time slot corresponding in next subframe next; If this descending time slot exists the downstream signal of this terminal corresponding, then terminal is according to the current AGC gain value of this descending time slot and AGC adjustment amount, obtains AGC next.Idiographic flow as shown in Figure 2, comprises the steps:
Step S201, the desired value RSSI of setting descending time slot received signal strength target.
Step S202, calculates the received signal strength RSSI of this business time-slot of present sub-frame.
Step S203, compares the received signal strength calculated and the desired value of presetting.
Step S204, according to the adjustment amount AGC of comparative result determination AGC gain step; Wherein adjustment amount can be fixed step size, also can be variable step size.Illustrate that adjustment amount is fixed then really with fixed step size distance below:
Suppose that the fixed step size of Gain tuning is FixedStep, wherein FixedStep > 0; If the received signal strength RSSI calculated is less than or equal to default desired value RSSI target, then adjustment amount AGC stepequal fixed step size FixedStep; If the received signal strength RSSI calculated is greater than default desired value RSSI target, then adjustment amount AGC stepequal the negative value of fixed step size.
Step S205, judges that whether present sub-frame is the end subframe of DPCH Transmission Time Interval (TransmissionTimingInterval is called for short " TTI "); If not, then enter step S206; If so, then step S207 is entered.
Step S206, by the AGC gain value AGC of this descending time slot of present sub-frame currentwith adjustment amount AGC stepbe added the AGC gain value AGC obtaining same descending time slot in next subframe next, i.e. AGC next=AGC current+ AGC step; And with this AGC nextcontrol the Signal reception of same descending time slot in next subframe.
In step S207 and step S208, according to the transformat combination instruction TFCI carried in subframe, judge the downstream signal whether this descending time slot existing this terminal corresponding.
Specifically, in step S207, according to the TFCI in current minimum TTI, the Radio Resource calculating this descending time slot reality takies situation.
Then in step S208, the Radio Resource according to this descending time slot reality calculated takies situation, judges whether this descending time slot exists the downstream signal of this user terminal corresponding, if there is no, then performs step S209; If existed, then perform step S210.
Step S209, according to the backup value AGC of the AGC gain of setting backup, calculate the AGC gain value AGC of same descending time slot in next subframe next.In the present embodiment, the AGC of setting backupfor the AGC of this descending time slot of correspondence calculated in the end subframe of upper once minimum TTI next, therefore in this step, calculating AGC nextafter, also need to upgrade this AGC backup, be about to the AGC gain value AGC of the same descending time slot of next subframe calculated nextas the backup value AGC of AGC gain backupstore.
Specifically, due in TD-SCDMA system, conveniently measure, in the cell the code channel of TS0 (time slot 0) in each subframe of heart frequency with upper meeting is launched according to reference power omnidirectional, the code channel of TS0 with also just beacon channel is referred to as.The characteristic of beacon channel: theaomni-directional transmission, each subframe exists, power invariability.Consider that radio propagation channel is still in the middle of change when the discontinuous transmitting of descending non-first business time-slot.Therefore, in the present embodiment, can in conjunction with the situation of change of received power on beacon channel in TD-SCDMA system, namely the variable quantity (also can be described as path loss variable quantity) of received power on beacon channel, obtains AGC next, to adapt to the change of wireless channel further.That is, suppose that the beacon channel received signal strength that a upper minimum TTI terminates subframe moment point is P-CCPCHRSCP last_minTTI, the beacon channel received signal strength that current minimum TTI terminates subframe moment point is P-CCPCHRSCP cur_minTTI, both are subtracted each other and obtain path loss variable quantity (Pathloss delta), i.e. Pathloss delta=P-CCPCHRSCP last_minTTI-P-CCPCHRSCP cur_minTTI.Then, according to the path loss variable quantity calculated to AGC backupaGC is obtained after carrying out correction-compensation next, that is, by this Pathloss deltawith the AGC of setting backup(namely go up a minimum TTI and terminate subframe moment point backup AGC backup) be added the AGC obtaining the same descending time slot of corresponding next subframe next, control the Signal reception of the corresponding descending time slot of next subframe; I.e. AGC next=AGC backup+ Pathloss delta.Calculating AGC nextafter, upgrade the backup value AGC of AGC gain backup, i.e. AGC backup=AGC next.
After execution step S208, if it is determined that this descending time slot exists the downstream signal of this user terminal corresponding, then perform step S210, by this descending time slot of present sub-frame AGC gain value AGC currentwith adjustment amount AGC stepbe added the AGC gain value AGC obtaining same descending time slot in next subframe next; I.e. AGC next=AGC current+ AGC step; And upgrade the backup value AGC of AGC gain backupfor the AGC gain value AGC of the same descending time slot of next subframe next, i.e. AGC backup=AGC next.
The implementation of research prior art, can find out if can know the actual transmission situation of descending time slot, so can avoid the AGC gain mistuning caused because rssi measurement value is on the low side.Owing to DPCH carrying transformat combination instruction (TFCI), according to TFCI, actual Radio Resource can be calculated under this TFCI and takies situation, also just can judge, in each of the lower on row time slot, whether to there is the downstream signal of this user terminal corresponding.The method taking situation according to TFCI calculating Radio Resource is identical with the method for rate-matched, is the known technology of those skilled in the art, does not specifically describe herein.First execution mode of the present invention is exactly judge whether this descending time slot exists the downstream signal of this user terminal corresponding according to TFCI, and the downstream signal of this user terminal corresponding whether is there is according to this descending time slot, calculate the AGC gain value AGC of the same descending time slot of next subframe respectively next, the reception saturated phenomenon that the discontinuous transmitting of non-first time slot produced due to momentary rate fluctuation under can tackling the configuration of descending multi-slot causes, guarantees the correct reception of terminal to downstream signal.
It is worth mentioning that, in the present embodiment, the AGC of setting backupfor the AGC of this descending time slot of correspondence calculated in the end subframe of upper once minimum TTI next, but in actual applications, the AGC of setting backupalso can be the empirical value preset, or be this descending time slot recently AGC gain value of using of correct Received signal strength.Embodiments of the present invention can be realized according to the actual requirements flexible and changeablely.
Second execution mode of the present invention relates to the terminal auto gain control method under a kind of downlink multi-slot business.Second execution mode improves on the first execution mode basis, and its improvements are: in second embodiment of the invention, after this descending time slot of judgement does not exist described downstream signal, performs the described AGC according to setting backup, obtain described AGC nextstep before, also comprise following steps:
According to whether there is the correct transmission block of decoding cyclic redundancy check (CRC) in current TTI, judge that whether TFCI is credible; Wherein, if there is the correct transmission block of decoding CRC, then judge that TFCI is credible; If there is no the transmission block that decoding CRC is correct, then judge that TFCI is insincere.
If it is determined that TFCI is credible, then perform the AGC according to setting again backup, obtain described AGC nextstep; If it is determined that TFCI is insincere, then forbid performing the AGC according to setting backup, obtain described AGC nextstep, terminal, according to the current AGC gain value of this descending time slot and AGC adjustment amount, obtains described AGC next.Idiographic flow as shown in Figure 3.
Due in the transmitting procedure of wireless signal, the propagation of TFCI symbol may be subject to various interference and destroyedly cause the result of TFCI decoding insincere; The result of data division CRC check now can be utilized to do further examination, if it is correct to there is at least one transmission block CRC in the CRC check result of data division, so the decode results of TFCI is reliable, and the Radio Resource calculated according to TFCI takies situation and also can accept and believe.By detecting the reliability of TFCI decode results, further ensure that the correct reception of terminal to downstream signal.
3rd execution mode of the present invention relates to the terminal auto gain control method under a kind of downlink multi-slot business.3rd execution mode is roughly the same with the first execution mode, and main distinction part is: in the first embodiment, according to the backup value AGC of the AGC gain of setting backup, in conjunction with the variable quantity (also can be described as path loss variable quantity) of received power on beacon channel, calculate the AGC gain value AGC of same descending time slot in next subframe next.And in third embodiment of the invention, after this descending time slot of judgement does not exist the downstream signal of this user terminal corresponding, directly use the backup value AGC of the AGC gain of setting backupas the AGC gain value AGC of the same descending time slot of next subframe next.
The step of various method divides above, just in order to be described clearly, can merge into a step or splitting some step, being decomposed into multiple step, when realizing as long as comprise identical logical relation, all in the protection range of this patent; To adding inessential amendment in algorithm or in flow process or introducing inessential design, but the core design not changing its algorithm and flow process is all in the protection range of this patent.
Four embodiment of the invention relates to a kind of terminal, as shown in Figure 4, comprises:
Resource occupation judge module, for each descending time slot for present sub-frame, according to the transformat combination instruction TFCI carried in subframe, judges the downstream signal whether this descending time slot existing this terminal corresponding.
First yield value acquisition module, during for judging this descending time slot not to exist described downstream signal at described resource occupation judge module, according to the backup value AGC of the automatic growth control AGC gain of setting backup, obtain the AGC gain value AGC of this descending time slot corresponding in next subframe next.
Second yield value acquisition module, for when described resource occupation judge module judges this descending time slot to exist described downstream signal, according to current AGC gain value and the AGC adjustment amount of this descending time slot, obtains described AGC next.
In the present embodiment, the first yield value acquisition module comprises following submodule:
Calculating sub module, for calculating the variable quantity of received power on beacon channel;
Correction-compensation submodule, for the described variable quantity calculated according to described calculating sub module, to described AGC backupcarry out correction-compensation, and using the value after correction-compensation as described AGC next.
In the present embodiment, present sub-frame is the end subframe in the minimum transfer time interval; The AGC of setting backupfor the AGC of this descending time slot of correspondence calculated in the end subframe in the upper once minimum transfer time interval next.
In addition, in actual applications, the AGC of setting backupalso can for the empirical value preset, or this descending time slot is the AGC gain value that uses of correct Received signal strength recently.
Be not difficult to find, present embodiment is the system embodiment corresponding with the first execution mode, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
It is worth mentioning that, each module involved in present embodiment is logic module, and in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.
Fifth embodiment of the invention relates to a kind of terminal.5th execution mode improves on the 4th execution mode basis, and its improvements are: in the 5th execution mode, terminal also comprises detection module and control module.
Specifically, detection module is when resource occupation judge module judges the downstream signal this descending time slot not existing this user terminal corresponding, whether there is the correct transmission block of decoding cyclic redundancy check (CRC) according in current minimum transfer time interval TTI, judge that whether TFCI is credible; Wherein, when there is the correct transmission block of decoding CRC, detection module judges that TFCI is credible; When there is not the correct transmission block of decoding CRC, detection module judges that TFCI is insincere.
Control module, when detection module judges that TFCI is insincere, is forbidden the triggering of described first yield value acquisition module, and is triggered described second yield value acquisition module.
In the present embodiment, by detecting the reliability of TFCI decode results, further ensure that the correct reception of terminal to downstream signal.
Because the second execution mode and present embodiment are mutually corresponding, therefore present embodiment can be worked in coordination with the second execution mode and be implemented.The relevant technical details mentioned in second execution mode is still effective in the present embodiment, and the technique effect that can reach in this second embodiment can realize in the present embodiment too, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the second execution mode.
Sixth embodiment of the invention relates to a kind of terminal.6th execution mode is roughly the same with the 4th execution mode, and its difference part is: in the 4th execution mode, the first yield value acquisition module comprises calculating sub module and correction-compensation submodule, utilizes this correction-compensation submodule to AGC backupcarry out correction-compensation and obtain AGC next.And in the 6th execution mode, the first yield value acquisition module is directly by the AGC of the backup value of setting AGC gain backup, as the AGC gain value AGC of this descending time slot corresponding in next subframe next.
Because the 3rd execution mode is mutually corresponding with present embodiment, therefore present embodiment can be worked in coordination with the 3rd execution mode and be implemented.The relevant technical details mentioned in 3rd execution mode is still effective in the present embodiment, and the technique effect that can reach in the third embodiment can realize in the present embodiment too, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the 3rd execution mode.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiments of the invention, and in actual applications, various change can be done to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims (12)

1. the terminal auto gain control method under downlink multi-slot business, is characterized in that, comprise following steps:
For each descending time slot of present sub-frame, terminal, according to the transformat combination instruction TFCI carried in subframe, judges the downstream signal whether this descending time slot existing this terminal corresponding;
If this descending time slot does not exist described downstream signal, then terminal is according to the backup value AGC of the automatic growth control AGC gain of setting backup, obtain the AGC gain value AGC of this descending time slot corresponding in next subframe next;
If this descending time slot exists described downstream signal, then terminal is according to the current AGC gain value of this descending time slot and AGC adjustment amount, obtains described AGC next;
Wherein, after this descending time slot of judgement does not exist described downstream signal, perform the described AGC according to setting backup, obtain described AGC nextstep before, also comprise following steps:
Whether there is the correct transmission block of decoding cyclic redundancy check (CRC) according in current minimum transfer time interval TTI, judge that whether described TFCI is credible; Wherein, if there is the correct transmission block of decoding CRC, then judge that described TFCI is credible; If there is no the transmission block that decoding CRC is correct, then judge that described TFCI is insincere;
If it is determined that described TFCI is credible, then perform the described AGC according to setting again backup, obtain described AGC nextstep; If it is determined that described TFCI is insincere, then forbid performing the described AGC according to setting backup, obtain described AGC nextstep, terminal, according to the current AGC gain value of this descending time slot and AGC adjustment amount, obtains described AGC next.
2. the terminal auto gain control method under downlink multi-slot business according to claim 1, is characterized in that, the described AGC according to setting backup, obtain described AGC nextstep in, comprise following sub-step:
According to the variable quantity of received power on beacon channel, to described AGC backupcarry out correction-compensation, and using the value after correction-compensation as described AGC next.
3. the terminal auto gain control method under downlink multi-slot business according to claim 1, is characterized in that, the described AGC according to setting backup, obtain described AGC nextstep in,
Directly by the AGC of described setting backup, as described AGC next.
4. the terminal auto gain control method under downlink multi-slot business according to claim 1, is characterized in that,
Described present sub-frame is the end subframe in the minimum transfer time interval.
5. the terminal auto gain control method under downlink multi-slot business according to any one of claim 1 to 4, is characterized in that,
The AGC of described setting backupfor the AGC of this descending time slot of correspondence calculated in the end subframe in the upper once minimum transfer time interval next.
6. the terminal auto gain control method under downlink multi-slot business according to any one of claim 1 to 4, is characterized in that,
The AGC of described setting backupfor the empirical value preset, or,
The AGC of described setting backupfor the AGC gain value that the nearest correct Received signal strength of this descending time slot uses.
7. a terminal, is characterized in that, comprises:
Resource occupation judge module, for each descending time slot for present sub-frame, according to the transformat combination instruction TFCI carried in subframe, judges the downstream signal whether this descending time slot existing this terminal corresponding;
First yield value acquisition module, during for judging this descending time slot not to exist described downstream signal at described resource occupation judge module, according to the backup value AGC of the automatic growth control AGC gain of setting backup, obtain the AGC gain value AGC of this descending time slot corresponding in next subframe next;
Second yield value acquisition module, for when described resource occupation judge module judges this descending time slot to exist described downstream signal, according to current AGC gain value and the AGC adjustment amount of this descending time slot, obtains described AGC next;
Wherein, described terminal also comprises:
Detection module, during for judging this descending time slot not to exist described downstream signal at described resource occupation judge module, whether there is the correct transmission block of decoding cyclic redundancy check (CRC) according in current minimum transfer time interval TTI, judge that whether described TFCI is credible; Wherein, described detection module, when there is the correct transmission block of decoding CRC, judges that described TFCI is credible; Described detection module, when there is not the correct transmission block of decoding CRC, judges that described TFCI is insincere;
Control module, for when described detection module judges that described TFCI is insincere, forbids the triggering of described first yield value acquisition module, and triggers described second yield value acquisition module.
8. terminal according to claim 7, is characterized in that, described first yield value acquisition module comprises following submodule:
Calculating sub module, for calculating the variable quantity of received power on beacon channel;
Correction-compensation submodule, for the described variable quantity calculated according to described calculating sub module, to described AGC backupcarry out correction-compensation, and using the value after correction-compensation as described AGC next.
9. terminal according to claim 7, is characterized in that,
Described first yield value acquisition module is directly by the AGC of described setting backup, as described AGC next.
10. terminal according to claim 7, is characterized in that, described present sub-frame is the end subframe in the minimum transfer time interval.
11. terminals according to any one of claim 7 to 10, is characterized in that,
The AGC of described setting backupfor the AGC of this descending time slot of correspondence calculated in the end subframe in the upper once minimum transfer time interval next.
12. terminals according to any one of claim 7 to 10, is characterized in that,
The AGC of described setting backupfor the empirical value preset, or,
The AGC of described setting backupfor the AGC gain value that the nearest correct Received signal strength of this descending time slot uses.
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CN104639266B (en) * 2015-02-06 2017-02-22 深圳市极致汇仪科技有限公司 Quick and accurate automatic gain control method
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CN101227212A (en) * 2008-01-17 2008-07-23 北京北方烽火科技有限公司 System and method for gain compensation in single antenna TD-SCDMA system
CN101466137A (en) * 2009-01-12 2009-06-24 北京天碁科技有限公司 TD-SCDMA terminal and automatic gain control method thereof
CN101959288A (en) * 2009-07-15 2011-01-26 展讯通信（上海）有限公司 Automatic gain control regulating method for received signals and signal receiving equipment

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CN101466137A (en) * 2009-01-12 2009-06-24 北京天碁科技有限公司 TD-SCDMA terminal and automatic gain control method thereof
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