CN101072055B - Downlink power control method at downlink discontinuous transmission for wireless communication system - Google Patents
Downlink power control method at downlink discontinuous transmission for wireless communication system Download PDFInfo
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- CN101072055B CN101072055B CN2006100788903A CN200610078890A CN101072055B CN 101072055 B CN101072055 B CN 101072055B CN 2006100788903 A CN2006100788903 A CN 2006100788903A CN 200610078890 A CN200610078890 A CN 200610078890A CN 101072055 B CN101072055 B CN 101072055B
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Abstract
The method includes steps: base station (BS) calculates mean of transmitted power of current sub frame when there is no discontinuous transmission (DT); BS calculates absolute value of deviation between transient transmission and the said mean of current sub frame; BS calculates mean of absolute value of deviation of current sub frame; when down going channel enters into DT, BS determines whether transient transmission power of current sub frame is smaller than sum of mean of transmitted power and mean of deviation; using adjusted transient transmission power of current sub frame being as down going special bursting transmission power in down going DT, and data down going initial transmission power when DT ends. When down going DTX, the method prevents power control in open loop by estimating path loss through up going channel. The invention compensates down going transmission power by using little computation complexity in order to improve down going communication quality.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the method for controlling downlink power in descending discontinuous when emission in a kind of wireless communication system.
Background technology
The uplink and downlink power control techniques is widely used in UTRA (Universal Telecommunication Radio Access) FDD and UTRA (Universal Telecommunication Radio Access) TDD 3.84/1.28Mcps system.
Conventional downlink power control process is as follows: subscriber equipment receives from after the signal of base station, and according to SIR (signal interference ratio) measured value to downstream signal, whether decision needs to increase or reduce the transmitting power of base station, and produces corresponding power control command.Subscriber equipment passes to the base station with power control command by up feedback channel, and the base station receives power control command can suitably adjust down transmitting power according to power control command.
For the TD-SCDMA system, when if the high level of base station or subscriber equipment does not have data to offer coded combination transmission channel (CCTrCH) in Transmission Time Interval (TTI), base station and subscriber equipment can be that unit implements discontinuous emission (DTX) with the coded combination transmission channel.When discontinuous emission acts on certain CCTrCH, this CCTrCH stops conventional data transmission, change into certain cycle emission special burst (SBs, Special Bursts), the up SB emission cycle is called SBGP (special burst generation period), and the descending SB emission cycle is called SBSP (special burst schedulingperiod).The enforcement of discontinuous emission eats dishes without rice or wine to disturb, save equipment energy consumption to minimizing and implement between the frequency of wireless system/and switch between system positive role is arranged.
For the TD-SCDMA system, when discontinuous emission acts on descending CCTrCH, exert an influence for descending power control meeting.Because descending CCTrCH is in discontinuous emitting state, during descending discontinuous emission, the base station can only receive SBs with the cycle of SBGP radio frames, the initial downlink data power after at this moment the base station can't be finished according to SBs power during the closed-loop fashion control DTX of routine and DTX.
For the downlink power control mode in the descending discontinuous emission process, if employing is determined descending SBs by the mode of the open loop power control of uplink channel estimation path loss, perhaps downlink data recovers the method for the initial downstream signal transmitting power in back, the power control error is bigger, realize complexity, down-link performance during the descending DTX and link are kept having a negative impact.
Summary of the invention
Method for controlling downlink power when the technical problem that the present invention solves provides descending discontinuous emission in a kind of wireless communication system.
The present invention specifically is achieved in that
The method for controlling downlink power in descending discontinuous when emission is characterized in that in a kind of wireless communication system, comprises the steps:
Carry out following processing for the coding transmission channel that descending discontinuous emission takes place:
When step 2, base station are calculated this channel and are not had discontinuous emission, the absolute value of the deviation of the transmitting power average of transient transmission power of current sub frame and current subframe;
Step 3, the weight of the absolute value of the deviation of the average of the absolute value of the absolute value of the deviation of the transmitting power average of average, transient transmission power of current sub frame and the current subframe of the absolute value of the deviation by last subframe, the deviation of described last subframe and the transmitting power average of described transient transmission power of current sub frame and current subframe, base station are calculated the average of absolute value of the deviation of current subframe;
When step 4, down channel need enter discontinuous emission, the average sum of absolute value of the deviation of the transmitting power average of the current subframe whether transient transmission power of current sub frame obtains less than step 1 and the current subframe that step 3 obtains was judged in the base station;
If described average sum and transient transmission power of current sub frame are subtracted each other the back and are adjusted multiplication, again with the transient transmission power of current sub frame addition, constitute adjusted current subframe transient transmission power;
If not, then keep transient transmission power of current sub frame constant;
Step 5 is with transmitting power and discontinuous emission the data initial downlink transmitting power when finishing of above-mentioned adjusted current subframe transient transmission power as descending special burst of descending discontinuous when emission.
Described step 1 to step 5 is implemented respectively each coding transmission channel that descending discontinuous emission may take place in the system by the base station.
In the described step 1,
The transmitting power average of described current subframe equal the transmitting power average of weight and last subframe product, one and the product of the difference of weight and transient transmission power of current sub frame and.
In the described step 3,
The average of the absolute value of the deviation of described current subframe equal weight and last subframe deviation absolute value average product, one and the product of the absolute value of the deviation of the transmitting power average of the difference of weight and transient transmission power of current sub frame and current subframe and.
Weight in the described step 1 is chosen by emulation according to network needs and channel situation, and the scope of choosing is 1/16～6/16.
Weight in the described step 3 is chosen by emulation according to network needs and channel situation, and the scope of choosing is 1/16～8/16.
Adjustment coefficient in the described step 4 is chosen by emulation according to network needs and channel situation, and the scope of choosing is 0～1.5.
The transmitting power average of this channel current subframe when not having discontinuous emission is calculated in the base station in the described step 1, adopts the average method of sliding window.
The average of absolute value of the deviation of current subframe is calculated in the base station in the described step 3, adopts the average method of sliding window.
Adjustment coefficient in the described step 4 carries out following processing:
Determine a threshold value according to channel situation by emulation,
If the average of the absolute value of the deviation of current subframe is greater than this threshold value, the span of adjusting coefficient is 0.5～1.5;
If the average of the absolute value of the deviation of current subframe less than, equal this threshold value, the span of adjusting coefficient is 0～0.5.
Can see by technique scheme, when descending DTX, method of the present invention has been avoided the open loop power control by uplink channel estimation path loss, and the down transmitting power with very little computation complexity during to descending DTX compensates, the downlink communication quality when improving descending DTX.
Description of drawings
Fig. 1 is the flow chart of the method for the invention.
Embodiment
Provide the example that a TD-SCDMA system carries out downlink power control when the descending DTX below in conjunction with accompanying drawing.
For arbitrary CCTrCH channel that descending DTX may take place:
(1) the transmitting power average of this channel when DTX not calculated in the base station
Wherein ρ is a weight,
Be the transmitting power average of calculating on the current subframe,
Represent the transmitting power average calculated on the last subframe, ρ can choose by emulation according to network needs and channel situation, and the scope that can select in the engineering is 1/16～6/16;
(2) not transient transmission power of current sub frame P during DTX of this channel is calculated in the base station
nAnd average
The absolute value of deviation:
The operation that abs () expression wherein takes absolute value;
(3) above-mentioned deviation δ is calculated in the base station
nAverage:
Wherein q is a weight,
Represent the average of the deviation calculated on the last subframe, q can choose by emulation according to network needs and channel situation, and the scope that can select in the engineering is 1/16～8/16;
(4) when descending DTX taking place, the base station judge current transmitting power whether less than
If then current transmitting power is adjusted into
If not, then keep current power constant, wherein β can choose by emulation according to network needs and channel situation for adjusting coefficient, and the scope that can choose in the engineering is 0～1.5;
(5) with the P ' of above-mentioned adjustment
nData initial downlink transmitting power when the transmitting power of descending SBs and DTX finish during as descending DTX.
Said method is implemented respectively each CCTrCH that descending DTX may take place in the system by the base station.
Optimizable, in said method step (1), (3) to P
nAverage and δ
nThe calculating of average also can adopt the average method of sliding window (such as the sliding window of 16 subframe lengths).
Optimizable, also further basis of the value of β in the above-mentioned steps (4)
Combined optimization, the present invention provide a kind of by
Combined optimization β method:
If
Then the β span is 0.5～1.5;
If
Then the β span is 0～0.5;
Above-mentioned thresholding T determines by emulation according to channel situation.
The base station is carried out downlink power control according to above-mentioned downlink power control mode to the channel of descending DTX, to improve communication quality.
Claims (10)
1. the method for controlling downlink power during descending discontinuous emission in the wireless communication system is characterized in that, comprises the steps:
Carry out following processing for the coding transmission channel that descending discontinuous emission takes place:
Step 1, by transmitting power average, transient transmission power of current sub frame, the transmitting power average of described last subframe and the weight of described transient transmission power of current sub frame of last subframe, the transmitting power average of this channel current subframe when not having discontinuous emission is calculated in the base station;
When step 2, base station are calculated this channel and are not had discontinuous emission, the absolute value of the deviation of the transmitting power average of transient transmission power of current sub frame and current subframe;
Step 3, the weight of the absolute value of the deviation of the average of the absolute value of the absolute value of the deviation of the transmitting power average of average, transient transmission power of current sub frame and the current subframe of the absolute value of the deviation by last subframe, the deviation of described last subframe and the transmitting power average of described transient transmission power of current sub frame and current subframe, base station are calculated the average of absolute value of the deviation of current subframe;
When step 4, down channel need enter discontinuous emission, the average sum of absolute value of the deviation of the transmitting power average of the current subframe whether transient transmission power of current sub frame obtains less than step 1 and the current subframe that step 3 obtains was judged in the base station;
If described average sum and transient transmission power of current sub frame are subtracted each other the back and are adjusted multiplication, again with the transient transmission power of current sub frame addition, constitute adjusted current subframe transient transmission power;
If not, then keep transient transmission power of current sub frame constant;
Step 5 is with transmitting power and discontinuous emission the data initial downlink transmitting power when finishing of above-mentioned adjusted current subframe transient transmission power as descending special burst of descending discontinuous when emission.
2. the method for controlling downlink power in descending discontinuous when emission in the wireless communication system as claimed in claim 1 is characterized in that:
Described step 1 to step 5 is implemented respectively each coding transmission channel that descending discontinuous emission may take place in the system by the base station.
3. the method for controlling downlink power in descending discontinuous when emission in the wireless communication system as claimed in claim 1 or 2 is characterized in that:
In the described step 1, the transmitting power average of described current subframe equal the transmitting power average of weight and last subframe product, one and the product of the difference of weight and transient transmission power of current sub frame and.
4. the method for controlling downlink power in descending discontinuous when emission in the wireless communication system as claimed in claim 1 or 2 is characterized in that:
In the described step 3, the average of the absolute value of the deviation of described current subframe equal weight and last subframe deviation absolute value average product, one and the product of the absolute value of the deviation of the transmitting power average of the difference of weight and transient transmission power of current sub frame and current subframe and.
5. the method for controlling downlink power during descending discontinuous emission in the wireless communication system as claimed in claim 1 or 2 is characterized in that:
Weight in the described step 1 is chosen by emulation according to network needs and channel situation, and the scope of choosing is 1/16～6/16.
6. the method for controlling downlink power during descending discontinuous emission in the wireless communication system as claimed in claim 1 or 2 is characterized in that:
Weight in the described step 3 is chosen by emulation according to network needs and channel situation, and the scope of choosing is 1/16～8/16.
7. the method for controlling downlink power during descending discontinuous emission in the wireless communication system as claimed in claim 1 or 2 is characterized in that:
Adjustment coefficient in the described step 4 is chosen by emulation according to network needs and channel situation, and the scope of choosing is 0～1.5.
8. the method for controlling downlink power during descending discontinuous emission in the wireless communication system as claimed in claim 1 or 2 is characterized in that:
The transmitting power average of this channel current subframe when not having discontinuous emission is calculated in the base station in the described step 1, adopts the average method of sliding window.
9. the method for controlling downlink power during descending discontinuous emission in the wireless communication system as claimed in claim 1 or 2 is characterized in that:
The average of absolute value of the deviation of current subframe is calculated in the base station in the described step 3, adopts the average method of sliding window.
10. as the method for controlling downlink power during descending discontinuous emission in the wireless communication system as described in the claim 7, it is characterized in that:
Adjustment coefficient in the described step 4 carries out following processing:
Determine a threshold value according to channel situation by emulation,
If the average of the absolute value of the deviation of current subframe is greater than this threshold value, the span of adjusting coefficient is 0.5～1.5;
If the average of the absolute value of the deviation of current subframe less than, equal this threshold value, the span of adjusting coefficient is 0～0.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006100788903A CN101072055B (en) | 2006-05-12 | 2006-05-12 | Downlink power control method at downlink discontinuous transmission for wireless communication system |
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| CN2006100788903A CN101072055B (en) | 2006-05-12 | 2006-05-12 | Downlink power control method at downlink discontinuous transmission for wireless communication system |
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| CN101072055B true CN101072055B (en) | 2010-06-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101488786B (en) * | 2008-01-15 | 2013-02-27 | 中兴通讯股份有限公司 | Uplink power control method for TD-SCDMA system |
| CN101488785B (en) * | 2008-01-15 | 2012-09-05 | 中兴通讯股份有限公司 | Downlink power control method for TD-SCDMA system |
| CN101568140B (en) * | 2009-06-15 | 2012-08-15 | 华为技术有限公司 | Power detection methods based on discontinuous transmission and base station |
Citations (5)
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| CN1167560A (en) * | 1995-01-04 | 1997-12-10 | 诺基亚电信公司 | Radio system for cordless subscriber line interface |
| CN1325200A (en) * | 2000-08-24 | 2001-12-05 | 深圳市中兴通讯股份有限公司 | Discontinuous emission treating method and device in wideband CDMA system |
| CN1383281A (en) * | 2001-04-26 | 2002-12-04 | 深圳市中兴通讯股份有限公司 | Method for controlling forward emitting power in CDMA system |
| EP1313231A1 (en) * | 2001-11-16 | 2003-05-21 | Lg Electronics Inc. | Method for controlling transmission power of HS-SCCH in UMTS system |
| CN1434593A (en) * | 2002-01-24 | 2003-08-06 | 华为技术有限公司 | Method for controlling external loop power in WCDMA system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167560A (en) * | 1995-01-04 | 1997-12-10 | 诺基亚电信公司 | Radio system for cordless subscriber line interface |
| CN1325200A (en) * | 2000-08-24 | 2001-12-05 | 深圳市中兴通讯股份有限公司 | Discontinuous emission treating method and device in wideband CDMA system |
| CN1383281A (en) * | 2001-04-26 | 2002-12-04 | 深圳市中兴通讯股份有限公司 | Method for controlling forward emitting power in CDMA system |
| EP1313231A1 (en) * | 2001-11-16 | 2003-05-21 | Lg Electronics Inc. | Method for controlling transmission power of HS-SCCH in UMTS system |
| CN1434593A (en) * | 2002-01-24 | 2003-08-06 | 华为技术有限公司 | Method for controlling external loop power in WCDMA system |
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Effective date of registration: 20180702 Address after: California, USA Patentee after: Global innovation polymerization LLC Address before: 518057 Zhongxing building, science and technology south road, Nanshan District hi tech Industrial Park, Guangdong, Shenzhen Patentee before: ZTE Corp. |
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