CN101399573B - Virtual closed loop power control method used in uncontinuous transmission period - Google Patents

Abstract

The invention discloses a virtual closed loop power control method used in a discontinuity transmission period. In receiving two gusty front and back interval periods of the same transmitting terminal, the method carries out a single operation as follows every a period of fixed time: Virtual signal to interference ratio is calculated; a corresponding TPC command word is set up according to the calculated virtual SIR; the TPC command word is transmitted to an emission end. Good power control effect can be obtained by using the method, thus guaranteeing the reception quality of the emission end and controlling disturbance on other users.

Description

Be used for the virtual closed loop circule power control method between discontinuous transmission period

Technical field

The present invention relates to the power control techniques in the wireless communication system, particularly a kind of virtual closed loop circule power control method that is used between discontinuous transmission period.

Background technology

Insert in (TD-SCDMA) system at tdd CDMA; When the increase of user's number or other user's in the network through-put power promotes; The capital increases the interference to the active user; Cause active user's signal to descend at the signal interference ratio (SIR) of receiving terminal, when this type disturbs greatly to a certain degree the time, the active user just can not proper communication.Therefore; Need take certain power control technology that user's through-put power is controlled; Make each user obtain acceptable speech quality, thereby reduce interference, raising power system capacity between the user to greatest extent with through-put power corresponding to current wireless environment minimum.

Common Poewr control method is divided into inner-loop power control and external circule power control.External circule power control is undertaken by radio network controller (RNC), and its purpose is: according to current wireless environment and QOS requirement, be updated periodically target SIR.The purpose of inner-loop power control is: target SIR and the actual SIR that calculates after upgrading according to external circule power control, send corresponding through-put power control (TPC) command word to the opposite end, and progressively adjust the through-put power of opposite end.For example: when the actual SIR that calculates when base station (Node B) or user terminal (UE) is less than or equal to current goal SIR, can send the TPC command word that improves through-put power to the opposite end; Otherwise, if the actual SIR that calculates greater than current goal SIR, then can send the TPC command word that reduces through-put power to the opposite end.Here, the process of calculating actual SIR is: when receiving the burst that comes from transmitting terminal, calculate the received signal code power (RSCP) of said burst, and measure current Interference Signal Code Power (ISCP), calculate actual SIR according to said RSCP and ISCP then.

Wherein, inner-loop power control comprises open loop power control and closed-loop power control again.The difference of these two kinds of circule power control methods is: open loop power control is the Initial Trans according to up link path loss situation estimating down-ward link, or according to the Initial Trans of down link path loss situation estimating uplink, this feedback is inc; And have the feedback loop of a closure in the closed-loop power control, through said feedback loop the uplink downlink of communication period is carried out the fast power adjustment, so that the quality of link converges on target SIR.

At present, in the TD-SCDMA system, have the scene of several kinds of discontinuous transmission, the performance of its circule power control method is poor, introduces respectively in the face of the circule power control method in these several kinds discontinuous transmitting scenes down.

1. the power control during the noncontinuity of DPCH (DPCH) transmission (DTX)

In the communication process of Node B and UE, some time period possibly not have actual data to need transmission, and the said time period is called DTX.During DTX, Node B and UE can periodically send some short packets to the opposite end, and these short packets are called special burst (Special Burst).

1) up link during the DTX (UL) power control

Regulation in the 5.1.1.4 joint of third generation partner program (3GPP) technical standard 25.224-660: during the DTX, UE ignores the TPC command word that Node B is provided with.Why do like this is because agreement is thought: do not exist transmitting uplink data this moment, and Node B can't calculate actual SIR and the TPC command word is set so, and the TPC command word field in the frame structure must be filled out, so can only be at will to fill out; Since Node B at will fills out, UE just can ignore this TPC command word, then carries out power control with following dual mode:

I) target of this method be guarantee up received power and the received power when transmitting continuously before consistent.According to relational expression:

Up received power=uplink transmission power-up path loss (1)

As long as UL channel and down link (DL) channel be symmetry and uplink interference no change fully, then, just can guarantee that up received power is constant, thereby guarantee that up SIR is constant through changing the variation that uplink transmission power compensates up path loss.

But two conditions that said method i is supposed: UL channel and DL channel be symmetry, uplink interference no change fully, all is false, and fact proved, adopts this mode only can let Special Burst power control disperse, and can't guarantee the quality of reception.

Ii) the target of this method is to guarantee that up received power equals the up expectation received power of static configuration.Formula according to common open loop power control algorithm:

Transmitting power-the path loss of the expectation received power=transmitting terminal of receiving terminal (2)

In the above-mentioned formula; The expectation received power of receiving terminal is a static configuration, should use in the scene, and the expectation received power of receiving terminal is meant the up expectation received power of Node B side configuration; The transmitting power of transmitting terminal is meant uplink transmission power, and path loss is meant up path loss.This method need send to UE with the up expectation received power that Node B side disposes through high-level signaling, calculates uplink transmission power by UE according to formula (2) again.

But there is following shortcoming in said method ii: on the one hand, the transmission of signaling can not be too frequent, otherwise the burden of eating dishes without rice or wine; On the other hand, for guaranteeing the quality of reception, will dispose bigger expectation received power, but this can cause more intense interference to other user again, influences the total quality of system.

2) the DL power control during the DTX

In the prior art standard not to the power control mode of the down link prescribed specific during the DTX.Because Node B is difficult to accurately estimate path loss, so industry takes not do the method for power control usually, like this, during the DTX, Node B will adopt with before at last during transmitting downstream Special Burst identical transmitting power come transmitting downstream Special Burst.

But; Relevant simulation result shows: receive the needed minimum quality of reception of Special Burst and will be lower than the needed quality of reception of reception data; Be reflected in the power control and be exactly: the transmitting power of Special Burst can be lower than the transmitting power of data; Therefore, identical transmitting power comes transmitting downstream Special Burst will cause the waste of power when adopting with last transmitting downstream Special Burst before, and brings unnecessary interference to other users.

2. high-speed packet inserts in (HSPA) system, the power control between the discontinuous transmission period of HS control channel

The HSPA system comprises that high speed downlink packet inserts (HSDPA) and high speed uplink packet inserts (HSUPA), in HSDPA system and HSUPA system, all has the discontinuous transmission of HS control channel.For example: in the HSDPA system, the user need seize DSCH Downlink Shared Channel, therefore has the situation of discontinuous dispatching, and this will cause the discontinuous transmission of HS control channel.The control channel of HSDPA comprises:

High-Speed Shared Control Channel (HS-SCCH), it is the down control channel in the HSDPA system;

High-speed shared indication channel (HS-SICH), it is the ascending control channel in the HSDPA system.

1) power control between the discontinuous transmission period of HS-SCCH

RNC can receive the descending path loss that UE reports, and therefore, can be that HS-SCCH is provided with Initial Trans according to the expectation quality of reception and the said descending path loss of HS-SCCH.Agreement regulation: NodeB can decide the Initial Trans of employing RNC setting in its sole discretion or launch HS-SCCH with the Initial Trans that other power control algorithm is confirmed.After this, can carry out closed-loop power control or not do power control HS-SCCH through the TPC command word that HS-SICH carries.

Yet if because the reason of scheduling causes the discontinuous transmission of HS-SCCH/HS-SICH to certain UE, above-mentioned closed-loop power control or the mode of not doing power control all can't be followed the tracks of the variation of channel/interference, thereby cause power control to be dispersed, and can't guarantee the quality of reception.

2) power control between the discontinuous transmission period of HS-SICH

One time the HSDPA data transmission procedure will be referred to three kinds of channels, and the participation order of each channel is following:

At first, HS-SCCH carries the emission of downlink data package informatin, is down channel;

Then, high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH) carries downlink data packet, carries out demodulation according to the packet information that HS-SCCH carries, and is down channel;

At last, whether demodulation successfully responds to downlink data packet by HS-SICH, is up channel.

When launching HS-SCCH for the first time, Node B does not also receive any HS-SICH signal, and therefore, the TPC command word that this HS-SCCH carries is invalid, and HS-SICH will use open loop power control that transmitting power is set.After this, if the interval of the transmission that is scheduled is not long, HS-SICH can adopt the TPC command word that HS-SCCH carries and carries out closed-loop power control so; The interval of transmission is very long if be scheduled, and the TPC command word of HS-SCCH setting will become inaccurate so, and HS-SICH should not adopt, but should carry out open loop power control again.

Because scheduling can't guarantee to transmit continuously to a certain user's HS-SCCH/HS-SICH, therefore, in most cases HS-SICH will take open loop power control.But frequent open loop power control is same to exist the problem of circule power control method ii during the existing DTX, that is: the burden of eating dishes without rice or wine, other users' interference is strengthened.

Visible by above-mentioned analysis, it is poor to have the performance that is used for the circule power control method between discontinuous transmission period now, causes the power control poor effect, can't guarantee the quality of reception of receiving terminal and control the interference to other users.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of virtual closed loop circule power control method that is used between discontinuous transmission period, to realize preferable power control effect.

For achieving the above object, technical scheme of the present invention specifically is achieved in that

A kind of virtual closed loop circule power control method that is used between discontinuous transmission period, in the interval of former and later two bursts that receive same transmitting terminal, whenever carry out once operation as follows at a distance from one period regular time:

A, the virtual signal interference ratio SIR of calculating;

B, corresponding through-put power control TPC command word is set according to the said virtual SIR that calculates;

C, said TPC command word is sent to said transmitting terminal.

Preferably, the virtual SIR of the said calculating of steps A comprises:

A1, the virtual received signal code power RSCP of calculating;

A2, the current Interference Signal Code Power ISCP of measurement;

A3, calculate SIR according to said virtual RSCP that calculates and the ISCP that measures.

Preferably, the virtual RSCP of steps A 1 said calculating is:

According to ${\mathrm{RSCP}\left(k\right)}_{\mathrm{Virtual}}={\mathrm{RSCP}}_{\mathrm{Meas}}+\mathrm{TPCStepSize}\×\underset{i=1}{\overset{k-1}{\mathrm{\Σ}}}\mathrm{TPC}\_\mathrm{CMD}\left(i\right)$ Calculate;

Wherein, k representes the execution number of times of said operation, begins from the previous burst of said two bursts, whenever counts 1 time at a distance from one section said regular time k;

RSCP (k) _Virtual, represent the virtual RSCP that calculates for the k time;

RSCP _Meas, represent the actual RSCP of the previous burst of said two bursts;

TPCStepSize is the power control step-length;

TPC_CMD (i), in expression interval, before said the k time calculating, i the TPC command word that receives from said transmitting terminal;

$\underset{i=1}{\overset{k-1}{\mathrm{\Σ}}}\mathrm{TPC}\_\mathrm{CMD}\left(i\right),$ In expression interval, before calculating for said the k time, the TPC command word that receives from said transmitting terminal add up and.

Preferably, said burst is: the special burst Special Burst of DPCH DPCH during the noncontinuity transmission DTX;

Said regular time is: the time span of a sub-frame, 5 milliseconds of ms.

Preferably, step C is said sends to said transmitting terminal with the TPC command word and is:

Said TPC command word is carried in the TPC command word field of subframe of said DPCH and sends to said transmitting terminal.

Preferably, said burst is: high-speed packet inserts the burst of high speed HS control channel during user's discontinuous dispatching in the HSPA system;

Said regular time is: the time interval of the HS control channel being sent the TPC command word.

Preferably, step C is said sends to said transmitting terminal with the TPC command word and is:

Continuous transmission channel through related with said HS control channel sends to said transmitting terminal with said TPC command word.

Preferably, the related continuous transmission channel of said and said HS control channel is:

With the equidirectional DPCH that follows of said HS control channel.

Preferably, through with the equidirectional DPCH that follows of said HS control channel, said TPC command word sent to said transmitting terminal be:

As a coded composite transport channel CCTrCH, it is right with the CCTrCH/ time slot that belongs to the said DPCH of following that the HS control channel is set, with the said mapping relations of following the subframe of DPCH with said HS control channel; And, the TPC command word of said HS control channel is carried in the TPC command word field of corresponding subframe of the said DPCH of following and sends to said transmitting terminal according to the mapping relations of said setting.

Further, it is characterized in that, after the said step C, can comprise:

Transmitting terminal is adjusted transmitting power according to said TPC command word, and has judged whether that burst needs emission, if having, then with the said burst that need launch of the emission of the transmitting power after the said adjustment; If no, then just adjust said transmitting power, do not carry out firing operation.

Visible by technique scheme; Virtual closed loop circule power control method of the present invention is through between discontinuous transmission period; Whenever calculate once virtual RSCP at a distance from one period regular time, measure ISCP at that time simultaneously, calculate virtual SIR according to said virtual RSCP and ISCP then; And then corresponding TPC command word is set; And said TPC command word sent to transmitting terminal, according to the TPC command word that receives its transmitting power is carried out virtual adjustment by transmitting terminal, thereby realized between discontinuous transmission period, transmitting terminal being carried out power control.

Because the value that the present invention has combined the actual RSCP of previous burst and calculated the TPC command word that has received before the current virtual RSCP when calculating virtual RSCP; Thereby one side can guarantee the continuity of power control; Can guarantee higher accuracy on the other hand; Thereby obtain preferable power control effect, guarantee the quality of reception of receiving terminal, and control is to other users' interference.

Description of drawings

Fig. 1 is used for the schematic flow sheet of the virtual closed loop circule power control method between discontinuous transmission period for the present invention.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is done further explain.

The present invention is directed in the existing TD-SCDMA system, be used for the relatively poor defective of circule power control method effect of discontinuous transmission, propose a kind of virtual closed loop circule power control method that is used between discontinuous transmission period.The main thought of virtual closed loop circule power control method provided by the present invention is: between discontinuous transmission period; Whenever calculate once virtual RSCP at a distance from one period regular time; Measure ISCP at that time simultaneously, calculate virtual SIR according to said virtual RSCP and ISCP then, and then corresponding TPC command word is set; And said TPC command word sent to transmitting terminal, according to the TPC command word that receives its transmitting power is carried out virtual adjustment by transmitting terminal.

Virtual RSCP according to the invention is for the said RSCP of prior art.The said RSCP of prior art be according to actual reception to burst calculate, be referred to as actual RSCP in the present invention; And owing between discontinuous transmission period, will can not receive any burst that comes from transmitting terminal, do not receive burst and just have no way of calculating actual RSCP, therefore, the RSCP that the present invention is calculated between discontinuous transmission period is called virtual RSCP.It is thus clear that virtual RSCP according to the invention is for continuity that guarantees power control and power control effect, and between discontinuous transmission period regularly to a kind of estimation that RSCP did.

Between said discontinuous transmission period, exactly: in the interval of former and later two bursts that receive same transmitting terminal.For Node B, exactly in the interval of former and later two bursts that receive same UE, use the method for the invention that the uplink transmission power of UE is controlled; For UE, exactly in the interval of former and later two bursts that receive Node B, use the method for the invention that the down transmitting power of Node B is controlled.

In background technology, enumerated during the DTX of the scene of several kinds of discontinuous transmission: DPCH and between the discontinuous transmission period of other channels; For example; Between the discontinuous transmission period of HSSICH and between the discontinuous transmission period of HSSCCH etc., method provided by the present invention all is suitable for these several kinds of scenes.

Fig. 1 is used for the schematic flow sheet of the virtual closed loop circule power control method between discontinuous transmission period for the present invention.The main body of carrying out method shown in Figure 1 can be Node B, also can be UE, is example with Node B in the following description.Referring to Fig. 1, in Node B receives interval of former and later two Burst of same UE, every at a distance from one period regular time, Node B will carry out as follows and operate:

Step 101: calculate virtual SIR.

In this step, Node B hypothesis: in the interval of former and later two Burst that receive same UE, this UE is whenever at a distance from Burst of one section regular time emission.That is to say that Node B hypothesis UE launches continuously.

Said one period regular time is the power control cycle, can be provided with according to the needs of practical application.Like this, Node B just can whenever calculate once virtual RSCP at a distance from one period regular time, measures ISCP at that time simultaneously, calculates virtual SIR according to said RSCP and ISCP then.

In this step, can calculate virtual RSCP according to formula as follows (3):

${\mathrm{RSCP}\left(k\right)}_{\mathrm{virtual}}={\mathrm{RSCP}}_{\mathrm{meas}}+\mathrm{TPCStepSize}\×\underset{i=1}{\overset{k-1}{\mathrm{\Σ}}}\mathrm{TPC}\_\mathrm{CMD}\left(i\right)---\left(3\right)$

In the formula (3), k representes the execution number of times of operation according to the invention, begins from the previous burst of said two bursts, whenever counts 1 time at a distance from one section said regular time k;

RSCP (k) _Virtual, represent the virtual RSCP that calculates for the k time;

RSCP _Meas, represent the actual RSCP of the previous burst of said two bursts; This value can calculate when receiving said previous burst;

TPCStepSize is the power control step-length; Unit is dB, is provided with in advance by system usually;

TPC_CMD (i), in expression interval, before said the k time calculating, i the TPC command word that receives from said transmitting terminal; The span of TPC command word is 1 and-1;

$\underset{i=1}{\overset{k-1}{\mathrm{\Σ}}}\mathrm{TPC}\_\mathrm{CMD}\left(i\right),$ In expression interval, before calculating for said the k time, the TPC command word that receives from said transmitting terminal add up and.

Through above-mentioned formula; The value that can combine the actual RSCP of previous burst and calculate the TPC command word that has received before the current virtual RSCP is estimated current virtual RSCP; This has guaranteed the continuity of power control on the one hand; Owing to be to estimate, can guarantee higher accuracy on the other hand with the value of the actual RSCP of previous burst and the TPC command word that received.

For the DTX of DPCH, the said power control cycle can be got the length of a sub-frame, i.e. 5ms; For the HS control channel, the said power control cycle is the time interval to HS control channel transmission TPC command word of agreement regulation, and for example: can get the length of a frame, promptly 10ms also can get 20ms or other values.

In this step, obtain current virtual RSCP and ISCP after, just can calculate current virtual SIR according to prior art, repeat no more at this.

Step 102: corresponding TPC command word is set according to the virtual SIR that calculates.

In this step, can according to virtual SIR corresponding TPC command word be set, repeat no more at this according to prior art.

Step 103: said TPC order is sent to transmitting terminal.

For the DTX of DPCH, existing protocol has been stipulated during DTX, to send the TPC command word, and just, of background technology, prior art can't correctly be provided with the TPC command word during DTX, so transmitting terminal will be ignored this TPC command word.Therefore, can continue to use the correlation technique of existing protocol regulation here, TPC command word according to the invention is carried in the TPC command word field of subframe of DPCH and send to transmitting terminal, the regulation transmitting terminal is adopted this TPC command word and is carried out corresponding power adjustment simultaneously.

For discontinuous channel transmitted, can use the said TPC command word of the continuous transmission channel related with said discontinuous channel transmitted.With the HS control channel is example, can be with transmitting said TPC command word with the equidirectional DPCH of following of this HS control channel.Because the said DPCH of following itself also exists the TPC command word to need transmission; Therefore; Certain power control order need be set (just: the TPC command word of HS control channel and the TCP command word of following DPCH itself; Follow the mapping relations of the subframe of DPCH with this), make the HS control channel the TPC command word with follow the TPC command word of DPCH itself, can according to the mapping relations of said setting the said DPCH of following interval transmit.Particularly:

When in the 5A.2.2.2 of 3GPP technical standard 25.221 joint, having stipulated the right TPC command word of transmission a plurality of coded composite transport channels (CCTrCH)/time slot; The mapping relations of the right TPC command word of said a plurality of CCTrCH/ time slot and the different subframes of DPCH need be set, and in different subframes, carry the right TPC command word of corresponding CCTrCH/ time slot according to said mapping relations.For instance:

With each CCTrCH/ time slot to as a power control object.If distributed 3 descending time slots and 1 ascending time slot in subframe, for certain user, so just need the TPC command word of using this 1 ascending time slot to carry 3 descending time slots.And, therefore, need carry the TPC command word of descending time slot 1, the TPC command word that subframe (N+1) is carried descending time slot 2 with subframe N owing to can only carry a TPC command word among the Burst of each time slot, subframe (N+2) is carried the TPC command word of descending time slot 3.Above-mentioned subframe N just is called mapping relations corresponding to descending time slot 2, subframe (N+2) corresponding to descending time slot 3 corresponding to descending time slot 1, subframe (N+1); Through above-mentioned mapping relations, just can use 1 ascending time slot that said 3 descending time slots are carried out power control in turn.

Based on above-mentioned technology; Can be with the HS control channel in the present embodiment as a CCTrCH; And it is right with the CCTrCH/ time slot that belongs to the said DPCH of following that the HS control channel is set; With the said mapping relations of following the subframe of DPCH; Then according to set mapping relations, the TPC command word of said HS control channel is carried in the TPC command word field of corresponding subframe of the said DPCH of following and sends to said transmitting terminal, thereby realize controlling with HS control channel and DPCH being carried out power with a TPC command word field compartment of terrain.

Can take multiple mode that said mapping relations are set; For example: can be provided with the CCTrCH/ time slot that belongs to the said DPCH of following to the CCTrCH/ time slot preceding, that the HS control channel is corresponding to after; And a plurality of time slots in each CCTrCH are according to the mapping relations of precedence ordering.

Step 104: transmitting terminal is received and according to said TPC command word transmitting power is carried out virtual adjustment after the said TPC command word.

The said implication that transmitting power is carried out virtual adjustment of this step is: do not need emission if transmitting terminal happens suddenly, then transmitting terminal is just adjusted the transmitting power of local terminal according to said TPC command word accordingly; If transmitting terminal has burst to need emission, launch said burst with regard to using said adjustment transmitting power afterwards.

So far, finish the present invention and be used for the virtual closed loop circule power control method flow process between discontinuous transmission period.

Analyze in the face of the performance of virtual closed loop circule power control method of the present invention down.

1, technical scheme of the present invention is applied to the DTX of DPCH during, to the influence that DPCH brought

Technical scheme of the present invention is applied to during the DTX of DPCH, its beneficial effect is conspicuous.Because, although TPC command word field is at will filled in the prior art,, this TPC command word is will launch.And adopt the set TPC command word of technical scheme of the present invention is effectively, and the present invention should effective TPC command word send to transmitting terminal under the prerequisite that does not increase the DPCH additional overhead, realized power control.

And; The value that the present invention has combined the actual RSCP of previous burst and calculated the TPC command word that has received before the current virtual RSCP when calculating virtual RSCP; This has guaranteed the continuity of power control on the one hand; Owing to be to estimate, can guarantee higher accuracy on the other hand with the value of the actual RSCP of previous burst and the TPC command word that received.

It is thus clear that the power control of during DTX, adopting technical scheme of the present invention to carry out can guarantee preferable power control effect, and guarantee the quality of reception of receiving terminal and control interference other users.

2, technical scheme of the present invention is applied between the discontinuous transmission period of HS control channel the influence that the HS control channel is brought

If adopt the TPC command word of the DPCH transmission HS control channel of following; So; Technical scheme of the present invention can guarantee the power control cycle of 10ms at least to the HS control channel, and is visible, and technical scheme of the present invention obviously is superior to existing circule power control method to HS control channel power control effect and to the influence of system.

If user's scheduling interval (being the discontinuous transmission intercal of HS control channel) is shorter than the correlated time of channel; Then technical scheme of the present invention is applied to the power control performance between the discontinuous transmission period of HS control channel, technical scheme of the present invention is applied to the power control effect during the DTX of DPCH approaching.If but the interval that the user is scheduled is long, such as surpassing 100ms, virtual closed loop power control so according to the invention will receive the influence of channel relevancy and be difficult to guarantee the quality of reception, and can adopt open loop power control to adjust the transmitting power of HS control channel this moment.

3, technical scheme of the present invention is applied between the discontinuous transmission period of HS control channel, uses the TPC command word of the DPCH transmission HS control channel of following, the influence that DPCH brought

Technical scheme of the present invention will make the power control cycle of following DPCH become 10ms from 5ms, thereby the power control of following DPCH is affected.Here, said influence mainly comes from the accuracy that virtual RSCP calculates.Because the power control cycle is long more, channel variation will be got over can cause virtual RSCP to calculate inaccurate.Concerning the power control cycle be 5ms and the 10ms, said influence can be divided into following interval:

(1) if the correlated time of channel greater than 10ms, then what difference the power control cycle of the power control cycle of 5ms and 10ms does not have.

(2) if the correlated time of channel less than 5ms, with 5ms be so the power control carried out in the power control cycle with ineffective, therefore,, can not continue to worsen the power control effect of this moment though be that the power control of being carried out in the power control cycle can not improve the power control effect of this moment with 10ms yet.This conclusion can access the support of relevant simulation result.

(3) if the correlated time of channel between 5ms and 10ms, at this moment, the power control effect of DPCH can worsen really, but this deterioration and not serious.

The application scenarios of considering HSPA mainly is stationary indoors user or vehicle-mounted user, and will drop on interval 2 stationary indoors user's the correlated time of channel), correlated time of channel of vehicle-mounted user will drop on interval 2), so, interval 3) applied probability will be few.

Therefore, in practical application, technical scheme of the present invention almost can be ignored to the adverse effect of DPCH.

In sum, the circule power control method that the present invention is used between discontinuous transmission period can be obtained preferable power control effect, thereby guarantees the quality of reception of receiving terminal, and control is to other users' interference.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (8)

1. a virtual closed loop circule power control method that is used between discontinuous transmission period is characterized in that, in the interval of former and later two bursts that receive same transmitting terminal, whenever carries out once operation as follows at a distance from one period regular time:

A, calculate virtual signal interference ratio (SIR);

B, corresponding through-put power control (TPC) command word is set according to the said virtual SIR that calculates;

C, said TPC command word is sent to said transmitting terminal;

The virtual SIR of the said calculating of steps A comprises:

A1, calculate virtual received signal code power (RSCP);

A2, the current Interference Signal Code Power (ISCP) of measurement;

A3, calculate SIR according to said virtual RSCP that calculates and the ISCP that measures;

The virtual RSCP of steps A 1 said calculating is:

According to ${\mathrm{RSCP}\left(k\right)}_{\mathrm{Virtual}}={\mathrm{RSCP}}_{\mathrm{Meas}}+\mathrm{TPCStepSize}\×\underset{i=1}{\overset{k-1}{\mathrm{\Σ}}}\mathrm{TPC}\_\mathrm{CMD}\left(i\right)$ Calculate;

Wherein, k representes the execution number of times of said operation, begins from the previous burst of said two bursts, whenever counts 1 time at a distance from one section said regular time k;

RSCP (k) _Virtual, represent the virtual RSCP that calculates for the k time;

RSCP _Meas, represent the actual RSCP of the previous burst of said two bursts;

TPCStepSize is the power control step-length;

TPC_CMD (i), in expression interval, before said the k time calculating, i the TPC command word that receives from said transmitting terminal;

represented in interval; Before calculating for said the k time, the TPC command word that receives from said transmitting terminal add up with.

2. virtual closed loop circule power control method according to claim 1 is characterized in that, said burst is: the special burst (Special Burst) of DPCH (DPCH) during the noncontinuity transmission (DTX);

Said regular time is: the time span of a sub-frame, 5 milliseconds (ms).

3. virtual closed loop circule power control method according to claim 2 is characterized in that, step C is said to send to said transmitting terminal with the TPC command word and be:

Said TPC command word is carried in the TPC command word field of subframe of said DPCH and sends to said transmitting terminal.

4. virtual closed loop circule power control method according to claim 1 is characterized in that, said burst is: high-speed packet inserts the burst of (HS) control channel at a high speed during user's discontinuous dispatching in (HSPA) system;

Said regular time is: the time interval of the HS control channel being sent the TPC command word.

5. virtual closed loop circule power control method according to claim 4 is characterized in that, step C is said to send to said transmitting terminal with the TPC command word and be:

Continuous transmission channel through related with said HS control channel sends to said transmitting terminal with said TPC command word.

6. virtual closed loop circule power control method according to claim 5 is characterized in that, the related continuous transmission channel of said and said HS control channel is:

With the equidirectional DPCH that follows of said HS control channel.

7. virtual closed loop circule power control method according to claim 6 is characterized in that, through with the equidirectional DPCH that follows of said HS control channel, said TPC command word sent to said transmitting terminal be:

As a coded composite transport channel (CCTrCH), it is right with the CCTrCH/ time slot that belongs to the said DPCH of following that the HS control channel is set, with the said mapping relations of following the subframe of DPCH with said HS control channel; And, the TPC command word of said HS control channel is carried in the TPC command word field of corresponding subframe of the said DPCH of following and sends to said transmitting terminal according to the mapping relations of said setting.

8. according to each described virtual closed loop circule power control method of claim 1 to 7, it is characterized in that, after the said step C, further comprise:

Transmitting terminal is adjusted transmitting power according to said TPC command word, and has judged whether that burst needs emission, if having, then with the said burst that need launch of the emission of the transmitting power after the said adjustment; If no, then just adjust said transmitting power, do not carry out firing operation.

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