CN101466137B - TD-SCDMA terminal and automatic gain control method thereof - Google Patents
TD-SCDMA terminal and automatic gain control method thereof Download PDFInfo
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Abstract
The invention provides a TD-SCDMA terminal and an automatic gain control method. The method includes the following steps: step A, when the terminal receives a business time slot downwards transmitted by a network side at the first time, the initial value which is used for receiving the AGC gain of the current subframe business time slot is set according to the relationship between the received signal intensity of the downlink pilot frequency time slot in the current subframe and the preset signal intensity range; wherein, the business time slot is the downlink time slot for loading business in the subframe, the preset signal intensity range is that the signal intensity scope when the business time slot signal processed by the network side power control reaches the terminal; step B, the terminal receives the business time slot in the current subframe according to the initial value of the AGC gain. According to the method, the UE can obtain the proper initial value of the AGC gain used for receiving the business time slot when discontinuously receiving the time slot, so as to speed up the AGC constringency of the business time slot, thus obtaining the fine communication property.
Description
Technical field
The present invention relates to wireless communication technology field, be particularly related to a kind of Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time-Division Synchronization Code Division Multiple Access) terminal and automatic gain thereof control (AGC, Auto Gain Control) method.
Background technology
In mobile communication system, because channel conditions is subjected to multipath effect, the influence of shadow effect and decline etc., variation in a big way can appear in received signal level.In order to guarantee good reception, received signal intensity must guarantee at certain input range, therefore need increase the automatic gain control module in receiver (terminal), makes the signal level of reception be stabilized in a suitable amplitude.
The physical channel of TD-SCDMA adopts four-layer structure: System Frame Number, radio frames, subframe and time slot/sign indicating number.Please refer to shown in Figure 1; the length of a TDMA radio frames is 10ms; be divided into two 5ms subframes; each subframe is divided into 7 conventional time slots (TS0-TS6) and 3 special time slots that length is 675us again: descending pilot frequency time slot (DwPTS; Downlink Pilot Time Slot), protection interval (GP) and uplink pilot time slot (UpPTS, Uplink Pilot Time Slot).
In the TD-SCDMA mobile communication system, system frame structure is made of a plurality of time slots, for each descending time slot, the automatic gain control module of user terminal (UE) is added up its signal energy respectively, generate the gain of received signal (AGC gain) of the corresponding time slot of next subframe then according to the AGC algorithm, receive corresponding time slot in next subframe according to this gain of received signal.In ideal conditions: network side transmits continuously, and user terminal receives continuously, and after convergence after a while, gain of received signal can be stabilized near the more satisfactory value.
But in the TD-SCDMA mobile communication system, there is the situation that does not satisfy above-mentioned condition in a large number:
1) from network side, the discontinuous emission of signal of Common Control Channel (for example paging channel PCH, forward access channel FACH, Page Indication Channel PICH and physical access channel FPACH etc.), between shared each subframe of these signals usually and discontinuous;
2) from the UE angle, carry out sub-district switching, sub-district gravity treatment or Traffic Channel reprovision under the situation of operations such as other sub-districts at UE, if the wireless connections of UE and network side are set up and are not also set up successfully, do not have this moment data to send on business time-slot, UE also just can't be by continuous reception business time-slot signal to obtain stable AGC gain.
In above-mentioned the 1st kind of situation, business time-slot is discontinuous emission on subframe; In the 2nd kind of situation, business time-slot does not begin continuous emission as yet on subframe.In these cases, general automatic gaining controling algorithm of the prior art can't be satisfied the demand, and causes the AGC of business time-slot in time not restrain, thereby has influenced the service behaviour of UE.
Summary of the invention
Technical problem to be solved by this invention provides a kind of TD-SCDMA terminal and auto gain control method thereof, make UE when discontinuous reception business time-slot, can obtain the initial value that suitable being used to receives the AGC gain of business time-slot, thereby accelerate the AGC convergence of business time-slot, to obtain the excellent communications performance.
For solving the problems of the technologies described above, it is as follows to the invention provides scheme:
A kind of automatic gain control AGC method of TD-SCDMA terminal comprises:
Steps A, terminal is when for the first time receiving the business time-slot that network side issues, according to the received signal intensity of descending pilot frequency time slot in the current subframe and the relation between the predetermined signal strength scope, be provided for receiving the initial value of the AGC gain of business time-slot in the current subframe, wherein, described business time-slot is the descending time slot of bearer service in the subframe, and described predetermined signal strength scope is the signal strength range when the business time-slot signal incoming terminal of network side power control and treatment;
Step B, terminal receives the business time-slot in the current subframe according to the initial value of described AGC gain.
Preferably, in the said method, in the described steps A, the described initial value that is provided for receiving the AGC gain of business time-slot in the current subframe specifically comprises:
The received signal intensity of descending pilot frequency time slot is prescribed a time limit less than the following of described predetermined signal strength scope in current subframe, it is first yield value that described initial value is set, wherein, described first yield value is the AGC gain that described terminal is adopted when received signal intensity is the business time-slot signal of described lower limit;
The received signal intensity of descending pilot frequency time slot is greater than prescribing a time limit on the described predetermined signal strength scope in current subframe, it is second yield value that described initial value is set, wherein, described second yield value is the AGC gain that described terminal is adopted when received signal intensity is the business time-slot signal of the described upper limit;
When the received signal intensity of descending pilot frequency time slot was between described first predetermined value and described second predetermined value in current subframe, it was that described terminal receives the AGC gain that descending pilot frequency time slot adopted in the current subframe that described initial value is set.
Preferably, in the said method, described terminal continue to receive the descending pilot frequency time slot that sends from network side, and during the descending pilot frequency time slot in receiving current subframe, according to the AGC convergence algorithm, is identified for receiving the AGC gain of the descending pilot frequency time slot in next subframe.
Preferably, in the said method, network side all sends described business time-slot in continuous a plurality of subframes, and described method also comprises:
Step C1, terminal receives the described business time-slot in each subframe in described a plurality of subframes continuously, and convergence process is carried out in the AGC gain of described business time-slot.
Preferably, in the said method, described convergence process comprises:
AGC gain according to being used to receive business time-slot described in the current subframe receives the described business time-slot in the current subframe;
The received signal intensity and the predetermined threshold value of business time-slot described in the current subframe are compared, obtain a comparative result;
According to described comparative result, adjust the AGC gain that is used to receive business time-slot described in next subframe.
Preferably, in the said method, network side all sends described business time-slot in discontinuous a plurality of subframes, and described method also comprises:
Step C2, after receiving described business time-slot for the first time, terminal is determined the AGC gain G (N) of the described business time-slot of reception according to following formula when receiving described business time-slot the N time, and receives described business time-slot according to this AGC gain G (N):
G(N)＝G(N-1)+(S(N)-S(N-1))
Wherein, N 〉=2, the received signal intensity of the descending pilot frequency time slot in the business time-slot place subframe that S (N) expression receives for the N time.
The present invention also provides a kind of TD-SDCMA terminal, comprising:
Business time-slot gain initialization module, be used for when described terminal receives the business time-slot that network side issues for the first time, according to the received signal intensity of descending pilot frequency time slot in the current subframe and the relation between the predetermined signal strength scope, be provided for receiving the initial value of the AGC gain of business time-slot in the current subframe, wherein, described business time-slot is the descending time slot of bearer service in the subframe, and described predetermined signal strength scope is the signal strength range when the business time-slot signal incoming terminal of network side power control and treatment;
The business time-slot receiver module is used for when described terminal receives described business time-slot for the first time, and the initial value that the described AGC that is provided with according to described business time-slot gain initialization module gains receives the business time-slot in the current subframe
Preferably, in the above-mentioned terminal, described business time-slot gain initialization module, also be used for: the received signal intensity at current subframe descending pilot frequency time slot is prescribed a time limit less than the following of described predetermined signal strength scope, it is first yield value that described initial value is set, wherein, described first yield value is the AGC gain that described terminal is adopted when received signal intensity is the business time-slot signal of described lower limit; The received signal intensity of descending pilot frequency time slot is greater than prescribing a time limit on the described predetermined signal strength scope in current subframe, it is second yield value that described initial value is set, wherein, described second yield value is the AGC gain that described terminal is adopted when received signal intensity is the business time-slot signal of the described upper limit; When the received signal intensity of descending pilot frequency time slot was between described first predetermined value and described second predetermined value in current subframe, it was that described terminal receives the AGC gain that descending pilot frequency time slot adopted in the current subframe that described initial value is set.
Preferably, in the above-mentioned terminal, also comprise:
The descending pilot frequency time slot receiver module is used for continue receiving the descending pilot frequency time slot that sends from network side, and during the descending pilot frequency time slot in receiving current subframe, according to the AGC convergence algorithm, is identified for receiving the AGC gain of the descending pilot frequency time slot in next subframe.
Preferably, in the above-mentioned terminal, described business time-slot receiver module also is used for receiving described business time-slot respectively in continuous a plurality of subframes, and the AGC yield value of described business time-slot is carried out convergence process.
Preferably, in the above-mentioned terminal, described business time-slot receiver module, also be used for receiving described business time-slot respectively in discontinuous a plurality of subframes, wherein, when receiving described business time-slot the N time, determine to receive the AGC gain G (N) of described business time-slot according to following formula, and receive described business time-slot according to this AGC gain G (N):
G(N)＝G(N-1)+(S(N)-S(N-1))
Wherein, N 〉=2, the received signal intensity of the descending pilot frequency time slot in the business time-slot place subframe that S (N) expression receives for the N time.
From the above as can be seen, TD-SCDMA terminal provided by the invention and auto gain control method thereof, UE is when receiving business time-slot for the first time, according to the received signal intensity of descending pilot frequency time slot in the current subframe and the relation between the predetermined signal strength scope, be provided for receiving the initial value of the AGC gain of business time-slot in the current subframe, then according to the initial value of described AGC gain, receive the business time-slot in the current subframe, thereby when discontinuous reception business time-slot signal, can obtain the initial value of proper A GC gain, improve the receptivity of first business time-slot.Among the present invention, business time-slot for discontinuous emission, the present invention adds twice wireless channel decline between the receiving cycle by the AGC gain with this business time-slot of a last receiving cycle, obtain the initial AGC gain of current receiving cycle, utilize this AGC gain to receive discontinuous business time-slot, thereby can reduce the amount of calculation of terminal, make that the reception of end side is real-time more and rapid, improve receiving efficiency.In addition, among the present invention for the continuous business time-slot of emission in a plurality of subframes, can utilize existing various AGC algorithm, on the initial value basis of the AGC of first business time-slot gain, carry out convergence process, can accelerate the convergence of the AGC of business time-slot, improve the quality of reception of business time-slot, obtain the excellent communications performance.
Description of drawings
Fig. 1 is a TD-SCDMA frame structure schematic diagram;
Fig. 2 is the signal strength signal intensity schematic diagram of each time slot in the subframe;
Fig. 3 for UE to the schematic diagram that concerns between Node B distance and the UE received signal intensity;
Fig. 4 be UE when cell boarder, descending pilot frequency time slot signal and business time-slot signal strength signal intensity concern schematic diagram;
Fig. 5 is UE when very near apart from Node B, and descending pilot frequency time slot signal and business time-slot signal strength signal intensity concern schematic diagram;
Fig. 6 is the flow chart of the described auto gain control method of the embodiment of the invention;
Fig. 7 is the schematic diagram of the discontinuous reception of FACH;
Fig. 8 is the structural representation of the described TD-SCDMA terminal of the embodiment of the invention.
Embodiment
When the present invention receives discontinuous business time-slot at UE, by the received signal intensity of the descending pilot frequency time slot in the current subframe is compared with the predetermined signal strength scope, and then the initial value of definite proper A GC gain, receive business time-slot in the current subframe according to this initial value, make UE when discontinuous reception business time-slot signal, can obtain the initial value of proper A GC gain, and then can accelerate the convergence of the AGC of business time-slot, obtain the excellent communications performance.The present invention is elaborated by specific embodiment below in conjunction with accompanying drawing.
In the present embodiment, described business time-slot is the descending time slot of bearer service in the subframe.
In the 1st kind of situation described in the background technology, business time-slot is discontinuous emission on subframe; In the 2nd kind of situation, business time-slot does not begin continuous emission as yet on subframe.In these cases, all need to determine the initial value of a proper A GC gain, make UE to receive first business time-slot preferably, and can accelerate the convergence of the AGC of business time-slot according to this initial value.
From the frame structure of TD-SCDMA mobile communication system as can be seen, have only descending pilot frequency time slot in each subframe, all to launch, that is to say, in above-mentioned two kinds of situations, UE receives down-bound pilot frequency signal usually continuously in each subframe, and during the descending pilot frequency time slot in receiving current subframe, UE generates the AGC gain (unit of gain is dB) that receives the descending pilot frequency time slot in next subframe by the AGC algorithm.Because the channel fading that pilot time slot and other non-pilot time slots are experienced is essentially identical, and certain correlation is arranged between their signal strength signal intensity.And in order to keep synchronous with network side, descending pilot frequency time slot signal normally receives continuously, thereby the AGC change in gain of descending pilot frequency time slot can reflect the change in signal strength of this sub-district, pilot time slot place substantially.When portable terminal the time at the non-pilot frequency time slot signal of discontinuous reception, just can be according to the Strength Changes of the pilot frequency time slot signal of respective cell, choose suitable initial AGC yield value and be used to receive the non-pilot frequency time slot signal in this sub-district, to accelerate the convergence of non-pilot time slot AGC.
In the TD-SCDMA mobile communication system, descending pilot frequency is the omni broadcast emission, and the business time-slot of bearer service is normally through the overpower control and treatment, and Fig. 2 shows the transmit signal strength of descending pilot frequency time slot and business time-slot under power control, and (the descending business time-slot here may be an example of the transmit signal strength of TS0, TS2～TS6).
As shown in Figure 3, in the ideal case, down-bound pilot frequency signal intensity and UE are inversely proportional to the distance between the Node B, and UE is near more apart from Node B, and the intensity of the down-bound pilot frequency signal that receives is big more; UE is far away more from Node B, and the intensity of the down-bound pilot frequency signal that receives is more little.In the prior art, at network side, the business time-slot of bearer service is subjected to the continuous action of power control, no matter make that distance is far and near between UE and the Node B, the received signal intensity of the business time-slot of UE side all remains within the prearranged signal strength range [T1, T2]; In the UE side, for the signal of received signal intensity within [T1, T2], UE adopts the AGC gain corresponding with this received signal intensity that this business time-slot signal is handled, and makes that the signal after handling satisfies the requirement that subsequent analysis is handled.That is to say that corresponding to the business time-slot signal of the signal strength signal intensity that receives within [T1, T2], the UE side all exists one and the corresponding AGC gain of this signal strength signal intensity.
When choosing the AGC gain that receives first business time-slot, consider following factor in the present embodiment:
1. when the border of terminal at current persistent district, pilot frequency time slot signal signal strength signal intensity after the decline of long distance is smaller, and because the effect of network side power control, its signal strength signal intensity can be relatively stable when arriving UE for the business time-slot signal of bearer service, as shown in Figure 4, wherein TSn represents business time-slot.Therefore the descending pilot frequency time slot power that receives of UE and the power on the business time-slot have bigger difference, pilot frequency time slot signal intensity is much smaller than the intensity of business time-slot signal, if directly using the current AGC of descending pilot frequency time slot to gain to receive business time-slot makes received signal saturated easily, can not reach reception preferably;
When terminal when Node B is closer, pilot frequency time slot signal is strong.And the business time-slot of bearer service can be relatively stable under the effect of power control, and the signal strength signal intensity of this moment as shown in Figure 5.Therefore, descending pilot frequency time slot power that UE receives and the power on the business time-slot also have bigger difference, and pilot frequency time slot signal intensity is much larger than the intensity of business time-slot signal.At this moment, receive business time-slot if directly use the current AGC of descending pilot frequency time slot to gain, can not guarantee to receive business time-slot usually has enough gains, can not reach reception preferably equally.
According to above analysis, when present embodiment received business time-slot for the first time, the initialization procedure of business time-slot AGC gain can specifically be divided into following 3 kinds of situations:
1. the received signal intensity of descending pilot frequency time slot is between within [T1, T2] scope the time, promptly more than or equal to T1 and when being less than or equal to T2, directly uses the initial value of the current AGC gain of descending pilot frequency time slot as the AGC gain that receives business time-slot;
2. the received signal intensity of descending pilot frequency time slot is greater than T2: in this case, if use the current AGC gain of descending pilot frequency time slot to receive business time-slot, the signal gain that can cause business time-slot too a little less than, can not guarantee normal reception.Therefore when the received signal intensity of descending pilot time slot during greater than T2, the initial value that receives the AGC gain of business time-slot in the present embodiment uses G2, wherein, G2 is the pairing reception of downstream signal intensity T2 AGC gain, i.e. the AGC gain adopted when received signal intensity is the signal of T2 of UE;
3. the received signal intensity of descending pilot frequency time slot is less than T1: in this case, AGC gain gain for non-pilot time slot of current descending pilot frequency time slot is too strong, if adopt the AGC gain of descending pilot frequency time slot to receive business time-slot, cause signal saturated easily, can not realize receptivity preferably equally.Therefore when descending pilot frequency time slot signal intensity during less than T1, the initial value that receives the AGC gain of business time-slot uses G1, wherein G1 is the pairing reception of downstream signal intensity T1 AGC gain, i.e. the AGC gain adopted when received signal intensity is the signal of T1 of UE.
Therefore, the auto gain control method of the described TD-SCDMA terminal of present embodiment as shown in Figure 6, may further comprise the steps:
According to above-mentioned flow process, UE is when receiving business time-slot for the first time, received signal intensity and predetermined signal strength scope [T1 according to descending pilot frequency time slot in the current subframe, T2] between relation, be provided for receiving the initial value of the AGC gain of business time-slot in the current subframe, wherein, described predetermined signal strength scope [T1, T2] is the signal strength range when the business time-slot signal of network side power control and treatment arrives the UE side; Then, UE receives the business time-slot in the current subframe according to the initial value of described AGC gain, thereby can obtain the initial value of proper A GC gain when discontinuous reception business time-slot signal, can improve the receptivity of first business time-slot.
At two kinds of situations described in the background technology, present embodiment can also comprise other step that receives first business time-slot business time-slot afterwards respectively after above-mentioned steps 12.Wherein, for the 1st kind of situation, as shown in Figure 7, and business time-slot discontinuous emission on subframe the time, FACH or UE that UE will receive discontinuous emission are operated in multiframe (Multi Frame) network environment.Among Fig. 7, in each cycle P1 (P1 comprises a plurality of subframes), wherein having only has FACH to send on certain business time-slot of a subframe.Receive N-1 FACH in first P1 cycle among Fig. 7, then, just receive N FACH in the next P1 cycle.Receive between the repetition period at two, network side is to FACH corresponding service time slot power control and treatment not.Here, N 〉=2.In this case, present embodiment can also be further according to the variation of the variation real-time tracking wireless channel of down-bound pilot frequency signal intensity, to obtain proper A GC gain, concrete, the auto gain control method of the described TD-SCDMA terminal of present embodiment can further include following steps after above-mentioned steps 12:
Step 13, the received signal intensity of supposing N-1 the descending pilot frequency time slot in the subframe of business time-slot place is S (N-1), the received signal intensity of the descending pilot frequency time slot in N business time-slot place subframe is S (N), then (S (N)-S (N-1)) can reflect that N-1 business time-slot is to the channel fading between N the business time-slot, therefore, when terminal received N business time-slot, the AGC gain G (N) that is adopted was:
G(N)＝G(N-1)+(S(N)-S(N-1))，N≥2
Wherein, G (N-1) is that terminal receives N-1 the AGC that business time-slot adopted gain.
In the following formula, the unit of S (N) is dBW or dBmW, and the unit of (S (N)-S (N-1)) is dB.
As shown in Figure 7, after receiving N-1 FACH, before receiving cycle P1 next time, FACH corresponding service time slot no longer receives, and pilot time slot is to receive continuously (all to have pilot time slot in each subframe in this process, but FACH corresponding service time slot is arranged not necessarily), to handle through downlink synchronization device, terminal can obtain the AGC gain of the lasting convergence of descending pilot frequency time slot in synchronous with the network side maintenance.When next receiving cycle P1 begins, suppose that the signal strength signal intensity of descending pilot frequency time slot stabilizes to S (N).Between twice receiving cycle, because FACH place business time-slot does not receive continuously, change that can't the monitoring wireless channel conditions, therefore before next receiving cycle begins, the AGC yield value of FACH place business time-slot originally can not adapt to current channel variation, need obtain a new reception AGC gain G (N) according to above-mentioned formula to the AGC initialization.
For the business time-slot of discontinuous emission, the AGC gain of this business time-slot of a last receiving cycle is added twice wireless channel decline between the receiving cycle, the initial AGC that just can obtain current receiving cycle gains.And the difference of the down-bound pilot frequency signal intensity between twice receiving cycle has just reflected the decline situation of wireless channel.Therefore can utilize above-mentioned formula to obtain a proper A GC gain, this business time-slot is received in the subframe relaying continued access after first business time-slot.
In the above-mentioned formula, utilize the difference of the twice down-bound pilot frequency signal intensity between the receiving cycle to calculate, and do not utilize the AGC gain of twice descending pilot frequency time slot between the receiving cycle to calculate.Because the obtaining normally to calculate according to signal strength signal intensity of AGC gain obtains: for example, the received signal intensity that obtains N the descending pilot frequency time slot in the subframe of business time-slot place be S (N) afterwards, S (N) need be compared with certain threshold, and then just obtain corresponding AGC gain by smoothing processing.Because the difference of down-bound pilot frequency signal intensity can reflect the decline situation of wireless channel, therefore in above-mentioned formula, directly calculate in the present embodiment according to signal strength signal intensity, obtaining received signal intensity is that S (N) can begin to calculate G (N) afterwards, make that the reception processing of end side is real-time more and rapid, improved receiving efficiency.
At the 1st kind of situation in the background technology, network side all sends business time-slot in continuous a plurality of subframes, and at this moment, the auto gain control method of the described TD-SCDMA terminal of present embodiment can further include following steps after above-mentioned steps 12:
Step 13 ', terminal receives the described business time-slot in each subframe in continuous a plurality of subframes, and the AGC yield value of described business time-slot is carried out convergence process.Wherein, described convergence process comprises: the AGC gain according to being used to receive business time-slot described in the current subframe receives the described business time-slot in the current subframe; The received signal intensity and the predetermined threshold value of business time-slot described in the current subframe are compared, obtain a comparative result; According to described comparative result, be identified for receiving the AGC gain of business time-slot described in next subframe.
As can be seen, when business time-slot is launched in a plurality of subframes continuously, can utilize existing various AGC algorithm, convergence process is carried out in AGC gain to business time-slot, thereby can be on the initial value basis of the AGC of first business time-slot gain, accelerate the convergence of the AGC of business time-slot, improve the quality of reception of business time-slot, obtain the excellent communications performance.
Based on the auto gain control method of above-mentioned TD-SCDMA terminal, present embodiment also provides a kind of TD-SCDMA terminal, and as shown in Figure 8, this terminal comprises:
The descending pilot frequency time slot receiver module is used for continue receiving the descending pilot frequency time slot that network side is sent, and during the descending pilot frequency time slot in receiving current subframe, according to the AGC convergence algorithm, is identified for receiving the AGC gain of the descending pilot frequency time slot in next subframe.
Business time-slot gain initialization module, be used for when described terminal receives the business time-slot that network side issues for the first time, according to the received signal intensity of descending pilot frequency time slot in the current subframe and the relation between the predetermined signal strength scope, be provided for receiving the initial value of the AGC gain of business time-slot in the current subframe, wherein, described business time-slot is the descending time slot of bearer service in the subframe, and described predetermined signal strength scope is the signal strength range when the business time-slot signal incoming terminal of network side power control and treatment;
The business time-slot receiver module is used for when described terminal receives described business time-slot for the first time, and the initial value that the described AGC that is provided with according to described business time-slot gain initialization module gains receives the business time-slot in the current subframe
Concrete, described business time-slot gain initialization module is used for: the received signal intensity at current subframe descending pilot frequency time slot is prescribed a time limit less than the following of described predetermined signal strength scope, it is described first yield value that described initial value is set, wherein, described first yield value is the AGC gain that UE is adopted when received signal intensity is the business time-slot signal of described lower limit; The received signal intensity of descending pilot frequency time slot is greater than prescribing a time limit on the described predetermined signal strength scope in current subframe, it is described second yield value that described initial value is set, wherein, described second yield value is the AGC gain that UE is adopted when received signal intensity is the business time-slot signal of the described upper limit; When the received signal intensity of descending pilot frequency time slot was between described first predetermined value and described second predetermined value in current subframe, it was the AGC gain that descending pilot frequency time slot adopted in the current subframe of reception that described initial value is set.
Preferably, above-mentioned business time-slot receiver module can also be used for receiving described business time-slot respectively in continuous a plurality of subframes, and the AGC yield value of described business time-slot is carried out convergence process.
Similarly, above-mentioned business time-slot receiver module, can also be used for receiving described business time-slot respectively in discontinuous a plurality of subframes, wherein, when receiving described business time-slot the N time, determine to receive the AGC gain G (N) of described business time-slot according to following formula, and receive described business time-slot according to this AGC gain G (N):
G(N)＝G(N-1)+(S(N)-S(N-1))
Wherein, N 〉=2, the received signal intensity of the descending pilot frequency time slot in the described business time-slot place subframe that S (N) expression receives for the N time.In the following formula, the unit of S (N) is dBW or dBmW, and the unit of (S (N)-S (N-1)) is dB.
Below with two application scenarioss the foregoing description is done more specifically explanation.
1) switch or the sub-district gravity treatment sub-district:
UE begins the signal of receiving target sub-district after receiving switching or gravity treatment order;
If Target cell had not been done to measure or not resident mistake, UE is the descending pilot frequency time slot of receiving target sub-district at first, the maintenance of process descending pilot frequency time slot receiver module is synchronous with Target cell, obtains the signal strength signal intensity of Target cell descending pilot frequency time slot and the AGC of correspondence simultaneously and gains;
Obtain after the AGC gain of Target cell descending pilot frequency time slot,, obtain the initial value of the AGC gain of receiving target Zone time slot through business time-slot gain initialization module.Concrete decision rule according to Target cell pilot frequency time slot signal intensity, is made comparisons with two thresholding T1 and T2 as previously mentioned, the AGC gain of being adopted when obtaining receiving for the first time above-mentioned business time-slot.
2) DCH of reception FACH or discontinuous emission:
In the TD-SCDMA communication system, FACH sends on discontinuous a plurality of subframes in a predefined manner.DCH under the Multi Frame network also has similar emission process.If the time between the twice emitting is long, during this period of time, wireless channel is subjected to influences such as decline and multipath and may changes very violent, so when repetition period next time arrives, receive the AGC gain of using last time and just do not satisfy requirement, saturated or the signal gets too small of signal can occur, cause to receive mistake once more.
Use the present invention program, in the discontinuous reception of FACH/DCH, down-bound pilot frequency signal is to receive continuously, and the variation of wireless channel can be represented by the variation of pilot signal strength between such twice receiving cycle.The AGC gain of going up a receiving cycle so adds the channel fading between the receiving cycle twice, and just the pilot signal strength of twice receiving cycle is poor, just can obtain the initialization AGC value of next receiving cycle.
In sum, auto gain control method that the embodiment of the invention provides and corresponding TD-SCDMA terminal, make terminal when receiving discontinuous business time-slot, can obtain the initial value of proper A GC gain, thereby accelerate the convergence of AGC, make business time-slot can reach good reception very soon, thus fast and network side connect.Particularly, switch (comprising direct-cut operation and baton handover), in the network environment of multicarrier and Multi Frame, use the present invention can obviously shorten the time of AGC convergence, obtain the excellent communications performance in the sub-district gravity treatment.
At last, it is pointed out that the above only is preferred embodiment of the present invention; not in order to restriction the present invention; within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the automatic gain of TD-SCDMA terminal control AGC method is characterized in that, comprising:
Steps A, terminal is when for the first time receiving the business time-slot that network side issues, according to the received signal intensity of descending pilot frequency time slot in the current subframe and the relation between the predetermined signal strength scope, be provided for receiving the initial value of the AGC gain of business time-slot in the current subframe, wherein, described business time-slot is the descending time slot of bearer service in the subframe, and described predetermined signal strength scope is the signal strength range when the business time-slot signal incoming terminal of network side power control and treatment;
Step B, terminal receives the business time-slot in the current subframe according to the initial value of described AGC gain;
Wherein, in the described steps A, the described initial value that is provided for receiving the AGC gain of business time-slot in the current subframe specifically comprises:
The received signal intensity of descending pilot frequency time slot is prescribed a time limit less than the following of described predetermined signal strength scope in current subframe, it is first yield value that described initial value is set, wherein, described first yield value is the AGC gain that described terminal is adopted when received signal intensity is the business time-slot signal of described lower limit;
The received signal intensity of descending pilot frequency time slot is greater than prescribing a time limit on the described predetermined signal strength scope in current subframe, it is second yield value that described initial value is set, wherein, described second yield value is the AGC gain that described terminal is adopted when received signal intensity is the business time-slot signal of the described upper limit;
When the received signal intensity of descending pilot frequency time slot was between described first predetermined value and described second predetermined value in current subframe, it was that described terminal receives the AGC gain that descending pilot frequency time slot adopted in the current subframe that described initial value is set.
2. the method for claim 1, it is characterized in that described terminal continue to receive the descending pilot frequency time slot that sends from network side, and during the descending pilot frequency time slot in receiving current subframe, according to the AGC convergence algorithm, be identified for receiving the AGC gain of the descending pilot frequency time slot in next subframe.
3. as each described method of claim 1 to 2, it is characterized in that network side all sends described business time-slot in continuous a plurality of subframes, described method also comprises:
Step C1, terminal receives the described business time-slot in each subframe in described a plurality of subframes continuously, and convergence process is carried out in the AGC gain of described business time-slot.
4. method as claimed in claim 3 is characterized in that, described convergence process comprises:
AGC gain according to being used to receive business time-slot described in the current subframe receives the described business time-slot in the current subframe;
The received signal intensity and the predetermined threshold value of business time-slot described in the current subframe are compared, obtain a comparative result;
According to described comparative result, adjust the AGC gain that is used to receive business time-slot described in next subframe.
5. as each described method of claim 1 to 2, it is characterized in that network side all sends described business time-slot in discontinuous a plurality of subframes, described method also comprises:
Step C2, after receiving described business time-slot for the first time, terminal is determined the AGC gain G (N) of the described business time-slot of reception according to following formula when receiving described business time-slot the N time, and receives described business time-slot according to this AGC gain G (N):
G(N)＝G(N-1)+(S(N)-S(N-1))
Wherein, N 〉=2, the received signal intensity of the descending pilot frequency time slot in the business time-slot place subframe that S (N) expression receives for the N time.
6. a TD-SDCMA terminal is characterized in that, comprising:
Business time-slot gain initialization module, be used for when described terminal receives the business time-slot that network side issues for the first time, according to the received signal intensity of descending pilot frequency time slot in the current subframe and the relation between the predetermined signal strength scope, be provided for receiving the initial value of the AGC gain of business time-slot in the current subframe, wherein, described business time-slot is the descending time slot of bearer service in the subframe, and described predetermined signal strength scope is the signal strength range when the business time-slot signal incoming terminal of network side power control and treatment;
The business time-slot receiver module is used for when described terminal receives described business time-slot for the first time, and the initial value that the described AGC that is provided with according to described business time-slot gain initialization module gains receives the business time-slot in the current subframe;
Wherein,
Described business time-slot gain initialization module, also be used for: the received signal intensity at current subframe descending pilot frequency time slot is prescribed a time limit less than the following of described predetermined signal strength scope, it is first yield value that described initial value is set, wherein, described first yield value is the AGC gain that described terminal is adopted when received signal intensity is the business time-slot signal of described lower limit; The received signal intensity of descending pilot frequency time slot is greater than prescribing a time limit on the described predetermined signal strength scope in current subframe, it is second yield value that described initial value is set, wherein, described second yield value is the AGC gain that described terminal is adopted when received signal intensity is the business time-slot signal of the described upper limit; When the received signal intensity of descending pilot frequency time slot was between described first predetermined value and described second predetermined value in current subframe, it was that described terminal receives the AGC gain that descending pilot frequency time slot adopted in the current subframe that described initial value is set.
7. terminal as claimed in claim 6 is characterized in that, also comprises:
The descending pilot frequency time slot receiver module is used for continue receiving the descending pilot frequency time slot that sends from network side, and during the descending pilot frequency time slot in receiving current subframe, according to the AGC convergence algorithm, is identified for receiving the AGC gain of the descending pilot frequency time slot in next subframe.
8. as each described terminal of claim 6 to 7, it is characterized in that,
Described business time-slot receiver module also is used for receiving described business time-slot respectively in continuous a plurality of subframes, and the AGC yield value of described business time-slot is carried out convergence process.
9. as each described terminal of claim 6 to 7, it is characterized in that,
Described business time-slot receiver module, also be used for receiving described business time-slot respectively in discontinuous a plurality of subframes, wherein, when receiving described business time-slot the N time, determine to receive the AGC gain G (N) of described business time-slot according to following formula, and receive described business time-slot according to this AGC gain G (N):
G(N)＝G(N-1)+(S(N)-S(N-1))
Wherein, N 〉=2, the received signal intensity of the descending pilot frequency time slot in the business time-slot place subframe that S (N) expression receives for the N time.
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| CN101848533B (en) * | 2010-04-28 | 2012-08-22 | 广州市广晟微电子有限公司 | Radio frequency self-loop automatic gain control method for TD-SCDMA terminal |
| WO2013004017A1 (en) * | 2011-07-07 | 2013-01-10 | 中兴通讯股份有限公司 | Method and system for implementing automatic gain control |
| WO2013013377A1 (en) * | 2011-07-25 | 2013-01-31 | Qualcomm Incorporated | Method and apparatus for automatic gain control for td-scdma systems |
| WO2013091171A1 (en) * | 2011-12-20 | 2013-06-27 | 中兴通讯股份有限公司 | Method and system for realizing auto gain control |
| CN103379602B (en) * | 2012-04-12 | 2016-04-20 | 联芯科技有限公司 | Terminal auto gain control method under downlink multi-slot business and terminal |
| CN103379607B (en) * | 2012-04-17 | 2018-01-30 | 中兴通讯股份有限公司 | The gain control method and device of TD HSPA+ terminal devices |
| CN103973387B (en) * | 2013-01-30 | 2016-12-28 | 电信科学技术研究院 | A kind of method and device safeguarding time slot state information |
| CN106332228A (en) * | 2015-06-16 | 2017-01-11 | 联芯科技有限公司 | Frequency sweeping method and device according to frequency band |
| CN111399001B (en) * | 2020-03-31 | 2022-05-06 | 和芯星通科技(北京)有限公司 | Method and device for processing broadband interference |
| CN112689322B (en) * | 2020-12-18 | 2023-01-24 | 展讯通信（上海）有限公司 | Power control method, device and equipment |
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