CN101325436A - Method for controlling power of terminal HS-SICH and method for correcting SNR predictive value - Google Patents

Abstract

Disclosed is a power control method of a terminal side HS-SICH and an SNR predicted value correction method. In one TTI, the terminal executes the following steps: when a high speed sharing indication channel HS-SICH signal transmission is on the current TTI and in the close loop, the terminal selects the power control command word TPC_lastest not used and received for the last time, performs the HS-SICH transmitting power adjustment; the terminal transmits the HS-SICH signal according to the determined transmitting power, for example, if the node B transmits the power control command word TPC_Current under the current TTI, the terminal stores as the new TPC_lastest. On side of the Node B, when TTI is provided with the HS-SCCH dispatching and in the close loop, e.g. the current TTI and the next TTI all have HS-SCCH signal transmission, the power control command word of the current TTI is used to correct the initial predicted SNR of the next TTI. The invention simplifies the process of the Node B and UE on the HS-SICH power control and the predication of SNR of the next TTI.

Description

The Poewr control method of end side HS-SICH and signal-to-noise ratio to predict value correction method

Technical field

(high speed downlink packet access technology: High-Speed Downlink Packet Access) terminal is by choosing TPC (TransmitPower Control power control commands word, or title power control command word) carries out power control to HS-SICH (High-SpeedShared Indicator Channel high-speed shared indication channel) channel method to the present invention relates to third generation mobile field TD-SCDMA HSDPA.And a kind of modification method to HS-SICH channel estimating signal to noise ratio.

Background technology

In the HSDPA HS-SICH power control process, the NodeB lateral root is according to the measurement signal to noise ratio (snr) value of HS-SICH, produce the required HS-SICH power control commands word of next TTI in current TTI, be put in the power control commands word cache pool of next TTI, when next TTI has descending HS-SCCH (High-Speed Shared Control Channel High-Speed Shared Control Channel, also being abbreviated as SCCH in the literary composition) when launching, NodeB directly takes out transmission, comes control terminal to go up the power of sending out HS-SICH next time.The target of power control is to make the received signal of next time reach target SNR (signal to noise ratio) as much as possible by adjusting power, to satisfy the requirement of the quality of reception.By the sequential characteristics of HS-SCCH and HS-SICH channel as can be known, terminal may be when sending HS-SICH be received several TPC among in front the HS-SCCH, existed repeatedly the HS-SICH signal to send (or being called the up feedback of HS-SICH) after also may receiving a TPC.

At these situations, the existing terminal side can adopt the mode of TPC buffering, selection receives that the more TPC of number of times adjusts current power, but this may bring certain trouble to the SNR prediction of the HS-SICH power control of NodeB, while NodeB and UE side be the power control information of the necessary more TTI of buffer memory all, calculate more complicated, need to propose a kind of simple method for this reason and solve this problem.

Summary of the invention

Technical problem to be solved by this invention has been to provide a kind of Poewr control method of end side high-speed shared indication channel, can simplify NodeB and the UE processing to the control of HS-SICH power.

In order to solve the problems of the technologies described above, the present invention proposes a kind of Poewr control method of end side high-speed shared indication channel, be applied to the TD-SCDMA high speed descending grouping access system, in a Transmission Time Interval TTI, terminal is carried out following steps:

(a) have high-speed shared indication channel HS-SICH signal to send as current TTI and be under the closed loop state, terminal is selected the power control commands word TPC_lastest that the last time receives and be not used for use, carries out the adjustment of HS-SICH transmitting power;

(b) terminal has issued power control commands word TPC_Current as Node B in current TTI by the transmitting power emission HS-SICH signal of determining, terminal is preserved it as new TPC_lastest.

Further, said method also can have following characteristics:

In the step (a), be used as TPC_lastest, the HS-SICH transmitting power remains unchanged.

Further, said method also can have following characteristics:

In the step (a), whether the terminal judges current TTI is that the 1st HS-SICH signal sends, interval T TI number between perhaps sending this transmission and last time is greater than the largest interval of setting, do not satisfy as two conditions, then be in the closed loop state, when arbitrary condition satisfies, be in open loop situations, carry out the HS-SICH signal by the open loop power of determining and send.

Further, said method also can have following characteristics:

When current TTI does not have the HS-SICH signal to send, issued power control commands word TPC_Current as Node B in current TTI, terminal is also preserved it as new TPC_lastest.

Another technical problem that the present invention will solve has provided a kind of modification method of high-speed shared indication channel signal-to-noise ratio to predict value, can simplify the prediction of NodeB side to the SNR of next TTI.

In order to solve the problems of the technologies described above, the invention provides a kind of modification method of high-speed shared indication channel signal-to-noise ratio to predict value, be applied to the TD-SCDMA high speed descending grouping access system, comprise the processing of end side and Node B side, wherein:

In end side, there is the HS-SICH signal to send and is under the closed loop state as current TTI, the power control commands word TPC_lastest that terminal selects for use the last time to receive and be not used carries out the adjustment of HS-SICH transmitting power, and by the power emission HS-SICH signal of determining, issued the power control commands word as Node B in current TTI, terminal is preserved it as new TPC_lastest;

In the Node B side, when current TTI has the HS-SCCH scheduling and is in the closed loop state, all there is the HS-SICH signal to send as current TTI and next TTI, then the initial predicted snr value of next TTI is revised with the power control commands word of current TTI.

Further, said method also can have following characteristics:

In the Node B side, there is not the HS-SCCH scheduling as current TTI, and satisfy the sequence number that the current TTI sequence number deducts current continuous first TTI of dispatching concentration and equal 4, and current TTI and next TTI all have the HS-SICH signal to send, and then the power control commands word that issues on HS-SCCH with Node B the last time is revised the initial predicted SNR value of next TTI.

Further, said method also can have following characteristics:

In the step (a), be used as TPC_lastest, the HS-SICH transmitting power remains unchanged.

Further, said method also can have following characteristics:

In the step (a), whether the terminal judges current TTI is that the 1st HS-SICH signal sends, interval T TI number between perhaps sending this transmission and last time is greater than the largest interval of setting, do not satisfy as two conditions, then be in the closed loop state, when arbitrary condition satisfies, be in open loop situations, carry out the HS-SICH signal by the open loop power of determining and send.

Further, said method also can have following characteristics:

When current TTI does not have the HS-SICH signal to send, issued power control commands word TPC_Current as Node B in current TTI, terminal is also preserved it as new TPC_lastest.

Adopt the Poewr control method that the TPC selection is finished that passes through of top described simple possible, can simplify of the prediction of NodeB side, reach better power control effect the signal to noise ratio of next TTI.

Description of drawings

Fig. 1 is as the TD HSDPA system HS-SCCH channel of example and the power control sequential schematic diagram of HS-SICH channel.

Fig. 2 is that embodiment of the invention UE side is by choosing the flow chart that the power control commands word carries out the control of HS-SICH channel power.

Embodiment

Below embodiment is described in detail, but not as a limitation of the invention.

For convenience of explanation, define following physical descriptor earlier:

Power_HS_SICH: the transmitted power of current HS-SICH;

Power when Power_HS_SICH_last: last HS-SICH (also being abbreviated as SICH in the literary composition) sends;

Step-length is adjusted in the UL_STEP:HS-SICH power control;

N: current TTI (Transmission Time Interval transmission time slot) sequence number;

Last_tti_idx: the TTI sequence number of correspondence when the last time sends HS-SICH;

TPC_Current: the TPC that current TTI is received (if any);

TPC_lastest: the TPC command word that the last time receives;

TPC_lastest_usage_flag: whether the TPC command word that the last time receives has been used the sign amount;

MAX_TTI_GAP: maximum TTI at interval;

Fig. 1 is a kind of power control sequential schematic diagram of HS-SCCH (also being abbreviated as SCCH in the literary composition) channel and HS-SICH channel.Among the figure shown in first row is the TTI operating position of NodeB HS-SCCH channel, and shown in second row is the TTI operating position of NodeB HS-SICH channel.Blank box is represented idle TTI, left oblique line frame

Represent that this TTI has SCCHTPC to issue, right oblique line frame

Expression has the up feedback of SICH.Show 16 TTI altogether, be divided into two HS-SCCH and dispatch collection continuously.

As can be seen, behind n the descending transmission of TTI of SCCH TPC power control commands word, the UE side can be behind 2 TTI in interval, and promptly n+3 TTI has the SICH signal to send.Whether the NodeB side can be calculated certain TTI in view of the above the up feedback of SICH.HS-SCCH wherein dispatches the set that collection is meant a certain user's one or more continuous descending SCCH emission TTI composition continuously, and the idle TTI number of the SCCH in this set between the adjacent TTI is all less than a certain largest interval (representing with the TTI number).Largest interval with default in the literary composition is designated as MAX_TTI_GAP, and this value has reflected the degree of correlation of channel on time domain.

Nearby principle is adopted in the TPC system of selection of present embodiment UE side.The TPC that UE record NodeB the last time issues, when current TTI has the SICH signal to send, as be in the closed loop state, UE only uses the last time to receive and original TPC carries out the power adjustment, the TPC that receives as the last time is used (promptly being used for the power adjustment), and then the HS-SICH transmitting power remains unchanged.As be in open loop situations, and be the 1st HS-SICH signal and send, whether the interval T TI number between perhaps sending this transmission and last time then adopts open loop to send greater than MAX_TTI_GAP.This need not much control informations of a TTI of buffer memory with UE side and NodeB side, has simplified the calculating of UE side and NodeB side, also makes the NodeB side that the correction of SNR predicted value is judged and becomes simple.

Fig. 2 shows the detailed process flow process of present embodiment UE side, in a TTI, carries out following steps:

Step 101 judges whether current TTI needs to send HS-SICH information, if execution in step 102 then, otherwise execution in step 110;

Step 102, whether sent HS-SICH information before judging n TTI, perhaps this sends TTI and sent idle TTI number between the TTI last time greater than MAX_TTI_GAP, promptly do not dispatch collection continuously at one, if both have any to satisfy, then execution in step 103, otherwise, execution in step 104;

Step 103, subscriber equipment measures path loss according to PCCPCH (Primary Common Control PhysicalChannel Primary Common Control Physical Channel), and determines open loop power, execution in step 107 according to the expectation power of HS-SICH;

Step 104 judges whether TPC_lastest_usage_flag (the sign amount whether the TPC command word received of the last time has been used) is FALSE, if, illustrate that this TPC command word is not used, then execution in step 105; Otherwise, illustrate that this TPC command word was used, then execution in step 106;

Step 105 is used this TPC command word, obtains the transmitted power of current HS-SICH, and the use sign of this TPC command word is set to be used execution in step 107;

The computing formula of the transmitted power Power_HS_SICH of current HS-SICH is:

Power_HS_SICH＝Power_HS_SICH_last+TPC_lastest*UL_STEP；

Wherein:

Power_HS_SICH_last: the power when last HS-SICH signal sends;

TPC_lastest: the TPC command word that the last time receives;

Step-length is adjusted in the UL_STEP:HS-SICH power control;

And have:

Power_HS_SICH_last＝Power_HS_SICH；

TPC_lastest_usage_flag=TR (expression is used).

Step 106, the last TPC command word was used, and did not need power is adjusted, and kept former transmitting power constant, i.e. Power_HS_SICH=Power_HS_SICH_last, execution in step 107;

Step 107 judges whether current TTI has the TPC command word of HS-SCCH, if confiscate, then execution in step 109; If receive, execution in step 108;

The TPC command word that step 108, current TTI are received is set to the TPC command word that the last time receives, i.e. TPC_lastet=TPC_Current; At this moment, this TPC command word also is not used, and its corresponding sign then is set: TPC_lastest_usage_flag=FALSE, execution in step 1 09;

Step 109, the HS-SICH signal carries out up transmission according to the Power_HS_SICH size.This step and step 107 and 108 there is no fixing sequencing.

Step 110 judges whether current TTI has the TPC command word of HS-SCCH, if confiscate, finishes; If receive, execution in step 111;

The TPC command word that step 111, current TTI are received is set to the TPC command word that the last time receives: TPC_lastet=TPC_Current; At this moment, this TPC command word also is not used, and its corresponding sign: TPC_lastest_usage_flag=FALSE then is set, and finishes.

With the situation shown in Fig. 1 is example,

First the continuous dispatching concentration that is illustrating, there is the SICH signal to send on the 6th TTI, this time send is not that the HS-SICH signal sends for the first time, and belong to same continuous scheduling collection with the 4th TTI before, then should use TPC that it is carried out the power adjustment, the TPC that its last time receives is the TPC5 that NodeB sends out on the 5th TTI, and this TPC was not used, so the 6th TTI should use 5 couples of HS-SICH of TPC to carry out the power adjustment.

For the 7th and the 8th TTI, there is the SICH signal to send, the TPC that receives of the last time is still for TPC5 and used at the 6th TTI, and is so the 7th and the 8th TTI should keep the HS-SICH transmitting power constant, identical during with the 6th TTI.

Second the continuous dispatching concentration that is illustrating, the 14th TTI has the SICH signal to send, but and the TTI of 5 free time arranged between the 8th TTI before, greater than the largest interval of setting (being assumed to 4), therefore do not belong to same continuous scheduling collection, should adopt the open Loop Power control pattern to carry out the emission of HS-SICH signal.The 16th TTI has the SICH signal to send, and should choose the 13rd TPC that TTI issues, and carries out power control on the transmitting power basis of the 14th TTI.

In the present embodiment,,, then adopt the pattern of similar closed power control if when current downlink TTI and last downlink TTI belong to same continuous emission collection in the NodeB side; Otherwise, then adopt open loop mode, this moment, the down order word was " DoNothing ", after the recipient receives this command word, do not carry out the power adjustment.

Particularly, the HS-SCCH scheduling is arranged, but be not to dispatch first TTI of collection continuously and when current continuous scheduling collection has been received the up feedback of HS-SICH, enter the closed loop state in current TTI.At this moment, the up feedback of HS-SICH is arranged, need to calculate the prediction snr value of next TTI as current TTI.

In general, with the initial predicted SNR value of the next TTI of two Parameters Calculation, promptly go up the SNR history value SNR_flt (n-1) of a TTI and the SNR transient measurement value SNR_realtime (n) of current TTI earlier, computing formula is generally:

SNR_flt(n)＝(1-p)*SNR_flt(n-1)+p*SNR_realtime(n) (1)

P in the following formula is a forgetting factor, and the big more expression SNR history value of this value is pair more little with the influence of next TTI predicted value, and in addition, formula (1) just provides as an example, and the present invention is not limited thereto.In addition, be invalid constant as SNR_flt, only adopt the basis for forecasting of current instantaneous value, i.e. SNR_flt (n)=SNR_realtime (n) as next TTI SNR.

When the SCCH scheduling is arranged, the principle that NodeB revises initial predicted SNR value is: after current TTI sends TPC (n), the UE side next TTI with regard to and only carry out the power adjustment with this TPC, then use TPC (n) that the initial predicted SNR value of next TTI is revised (as the ranking operation of the prediction SNR value that participates in next TTI).During judgement, only need satisfy current TTI and next TTI all has the up feedback of SICH to get final product, and SCCH scheduling situation can be inferred out before whether next TTI had the up feedback basis of SICH.

In addition, suppose that NodeB side current TTI does not have the SCCH scheduling, during as current TTI sequence number n-First_TTI_idx=4, then system is in first TTI that changes closed loop from open loop over to, as current TTI and next TTI the up feedback of SICH is arranged all, the TPC that available NodeB the last time issues on SCCH revises the initial predicted SNR value of next TTI.UE side the last TPC that issues before next TTI uses carries out the power adjustment.

As can be seen, the prediction of NodeB side to the signal to noise ratio of next TTI simplified in the processing of above-mentioned UE side, but it should be noted that here, though the UE side adopts different TPC to choose mode and can the SNR correction of NodeB side be exerted an influence, but the processing method of NodeB end does not have influence on the TPC choosing method of UE side, how just UE just is received in the TPC that sends on the SCCH, and is to be determined by the UE side as for choosing.

Should be understood that; concerning the technology of the present invention those of ordinary skill in the field; can be equal to accordingly according to technical scheme of the present invention and design thereof and change or replace, and all these changes or replacement, all should belong to the protection range of claim of the present invention.

Claims (9)

1, a kind of Poewr control method of end side high-speed shared indication channel is applied to the TD-SCDMA high speed descending grouping access system, and in a Transmission Time Interval TTI, terminal is carried out following steps:

(a) have high-speed shared indication channel HS-SICH signal to send as current TTI and be under the closed loop state, terminal is selected the power control commands word TPC_lastest that the last time receives and be not used for use, carries out the adjustment of HS-SICH transmitting power;

(b) terminal has issued power control commands word TPC_Current as Node B in current TTI by the transmitting power emission HS-SICH signal of determining, terminal is preserved it as new TPC_lastest.

2, the method for claim 1 is characterized in that:

In the step (a), be used as TPC_lastest, the HS-SICH transmitting power remains unchanged.

3, method as claimed in claim 1 or 2 is characterized in that:

In the step (a), whether the terminal judges current TTI is that the 1st HS-SICH signal sends, interval T TI number between perhaps sending this transmission and last time is greater than the largest interval of setting, do not satisfy as two conditions, then be in the closed loop state, when arbitrary condition satisfies, be in open loop situations, carry out the HS-SICH signal by the open loop power of determining and send.

4, the method for claim 1 is characterized in that:

When current TTI does not have the HS-SICH signal to send, issued power control commands word TPC_Current as Node B in current TTI, terminal is also preserved it as new TPC_lastest.

5, a kind of modification method of high-speed shared indication channel signal-to-noise ratio to predict value is applied to the TD-SCDMA high speed descending grouping access system, comprises the processing of end side and Node B side, wherein:

In end side, there is the HS-SICH signal to send and is under the closed loop state as current TTI, the power control commands word TPC_lastest that terminal selects for use the last time to receive and be not used carries out the adjustment of HS-SICH transmitting power, and by the power emission HS-SICH signal of determining, issued the power control commands word as Node B in current TTI, terminal is preserved it as new TPC_lastest;

In the Node B side, when current TTI has the HS-SCCH scheduling and is in the closed loop state, all there is the HS-SICH signal to send as current TTI and next TTI, then the initial predicted snr value of next TTI is revised with the power control commands word of current TTI.

6, method as claimed in claim 5 is characterized in that:

In the Node B side, there is not the HS-SCCH scheduling as current TTI, and satisfy the sequence number that the current TTI sequence number deducts current continuous first TTI of dispatching concentration and equal 4, and current TTI and next TTI all have the HS-SICH signal to send, and then the power control commands word that issues on HS-SCCH with Node B the last time is revised the initial predicted SNR value of next TTI.

7, method as claimed in claim 5 is characterized in that:

In the step (a), be used as TPC_lastest, the HS-SICH transmitting power remains unchanged.

8, method as claimed in claim 5 is characterized in that:

In the step (a), whether the terminal judges current TTI is that the 1st HS-SICH signal sends, interval T TI number between perhaps sending this transmission and last time is greater than the largest interval of setting, do not satisfy as two conditions, then be in the closed loop state, when arbitrary condition satisfies, be in open loop situations, carry out the HS-SICH signal by the open loop power of determining and send.

9, method as claimed in claim 5 is characterized in that:

When current TTI does not have the HS-SICH signal to send, issued power control commands word TPC_Current as Node B in current TTI, terminal is also preserved it as new TPC_lastest.

Images