CN101488785B - Downlink power control method for TD-SCDMA system - Google Patents
Downlink power control method for TD-SCDMA system Download PDFInfo
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- CN101488785B CN101488785B CN200810001036A CN200810001036A CN101488785B CN 101488785 B CN101488785 B CN 101488785B CN 200810001036 A CN200810001036 A CN 200810001036A CN 200810001036 A CN200810001036 A CN 200810001036A CN 101488785 B CN101488785 B CN 101488785B
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Abstract
The invention discloses a downlink power control method of a time division-synchronous CDMA access system. When the time division-synchronous CDMA access system is down and does not continuously transmit, channels are transmitted to either coded combination in downlink and discontinuous transmission state; if user equipment judges that receiving downlink signals in downlink frames are not activated, a 'deactivation state' counter is added with 1; if the user equipment judges that the numerical value of the 'deactivation state' counter is equal to a special outburst dispatching cycle, the user equipment generates and transmits upward power-controlled command words elevating downlink power, thus finishing the downlink power control when the time division-synchronous CDMA access system is down and does not continuously transmit. The method is applied to cause that when SBs can not be detected in downlink, the user equipment still can generate appropriate power-controlled command words to cause that a terminal increases power to overcome the deterioration of wireless channels in the period of downlink and discontinuous transmission.
Description
Technical field
The present invention relates to a kind of wireless communication field; Relate more specifically to a kind of TD SDMA and insert (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA) method for controlling downlink power during the descending discontinuous emission of system.
Background technology
The closed power control technology is the basic fundamental in the TD-SCDMA system, and in the closed power controlling mechanism, subscriber equipment/base station is according to periodically adjusting transmitting power from the entrained power control command of the based on feedback link of base station/user equipment.With the downlink power control is example, and subscriber equipment receives from after the signal of base station, determines according to the sir measurement value to downstream signal whether the needs increase perhaps reduces the transmitting power of base station, and produces corresponding power control command.Subscriber equipment passes to the base station with power control command through up feedback channel, and down transmitting power is adjusted after receiving power control command in the base station.
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 coded combination transmission channel (CCTrCH).When discontinuous emission (DTX) acts on certain CCTrCH; This CCTrCH stops conventional data transmission; Change into certain cycle emission special burst (SBs, Special Bursts); Up SB transmit cycle is called SBGP (special burst generation period), and descending SB transmit cycle is called SBSP (special burst scheduling period), referring to Fig. 1.Equipment energy consumption is eated dishes without rice or wine to disturb, saved to the enforcement of discontinuous emission to minimizing has positive role.When high level when a certain TTI provides data again to coded combination transmission channel (CCTrCH), descending discontinuous emitting state is withdrawed from immediately at this TTI in the terminal, recovers the emission of downlink data.
When descending discontinuous emission was implemented, base station cycle transmitting downstream SBs was in order to keep link, and user terminal can produce appropriate power control commands word according to the SBs that receives and carry out the control of downlink closed-loop power.Under the regular situation, when descending discontinuous emission took place, base station and terminal relied on descending SBs to keep the process of closed-loop power control according to aforesaid way.
After descending discontinuous emission took place, under the impaired condition of some wireless channel, when being caused the path loss sudden change such as wireless channel blocks suddenly, subscriber equipment possibly can't detect descending SBs, and just there is certain problem at this moment above-mentioned conventional circule power control method.After descending discontinuous emission takes place; When subscriber equipment can't detect descending SBs; Subscriber equipment just can't produce suitable power control commands word through the measurement of upward signal in a conventional manner; If this channel degradation condition continues always, subscriber equipment just can't effectively utilize closed-loop power control and improve descending power and make the user detect descending SBs.So subscriber equipment is after descending discontinuous emission takes place; Need someways distinguish " base station does not transmit " and " base station transmit signals and subscriber equipment can't detect " both of these case; Even make descendingly can't detect SBs the time, subscriber equipment still can produce suitable power control commands word makes the base station improve the deterioration that power overcomes the wireless channel during the descending discontinuous emission.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method for controlling downlink power of TD-SCDMA system; Even make descendingly can't detect SBs the time, subscriber equipment still can produce suitable power control commands word makes the terminal improve the deterioration that power overcomes the wireless channel during the descending discontinuous emission.
In order to address the above problem; The invention provides a kind of method for controlling downlink power of TD-SCDMA system; When the descending discontinuous emission of TD-SCDMA system, for arbitrary coded combination transmission channel that is in descending discontinuous emitting state
If subscriber equipment is judged the downstream signal in the downlink frame that receives and is not activated; Then " not state of activation " counter is added 1; If subscriber equipment is judged the numerical value of said " not state of activation " counter and is equaled special burst dispatching cycle; Then subscriber equipment produces the power control commands word raise downlink power and goes up and send out, the descending power control when accomplishing the descending discontinuous emission to TD-SCDMA system.
Further, said method also can comprise, before whether the downstream signal in the downlink frame that said subscriber equipment judgement receives activates, also comprises step,
A1, subscriber equipment produce the downlink power control command word according to the descending special burst that receives activation, and said " not state of activation " counter are carried out zero clearing;
A2, subscriber equipment receive and detect the downstream signal energy of each frame behind the descending special burst of said activation.
Further, said method also can comprise, among the said step a2, receives and detect the downstream signal energy of each frame behind the descending special burst that activates, and comprising: the downstream signal to each subframe in this frame receives respectively and detects.
Further, said method can comprise that also for the frame structure of TD-SCDMA system, a frame comprises two sub-frame.
Further; Said method also can comprise; Said subscriber equipment judges that whether the downstream signal in the downlink frame activates, and comprising: when the downstream signal energy of each subframe of this frame during all greater than thresholding T_active, represent that the downstream signal in this downlink frame activates; Wherein, thresholding T_active obtains through emulation according to wireless environment.
Further, said method also can comprise, activates if said subscriber equipment is judged the downstream signal in the downlink frame that receives, and then carries out said step a1.
Further, said method also can comprise, if the numerical value of said " not state of activation " counter is then carried out said step a2 less than special burst dispatching cycle.
Further, said method also can comprise, said subscriber equipment produce the power control commands word of raising downlink power and on send out after, to said " not state of activation " counter O reset, carry out said step a2.
Compared with prior art; Use the present invention; Subscriber equipment does not have detected situation through the counting of descending not state of activation has been judged base station SBs; When this situation took place, subscriber equipment produced the power control commands word of raising downlink power and goes up and send out, and has still kept the closed loop procedure of downlink power control.Make descendingly can't detect SBs the time, subscriber equipment still can produce suitable power control commands word makes the base station improve the deterioration that power overcomes the wireless channel during the descending discontinuous emission.
Description of drawings
Fig. 1 is the sequential sketch map of TD-SCDMA system descending discrete state;
Fig. 2 is the TD-SCDMA system descending of the present invention method for controlling downlink power flow chart in discontinuous when emission.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Main design of the present invention is, when the discontinuous emission of TD-SCDMA system descending, and for arbitrary coded combination transmission channel (CCTrCH) that is in descending discontinuous emitting state,
If subscriber equipment is judged the downstream signal in the downlink frame (frame) that receives and is not activated; Then " not state of activation " counter N_inactive is added 1; If subscriber equipment is judged the numerical value of " not state of activation " counter N_inactive and is equaled SBSP; Then subscriber equipment produces the power control commands word raise downlink power and goes up and send out, the descending power control when accomplishing the descending discontinuous emission to the TD-SCDMA system.
The method for controlling downlink power in TD-SCDMA system descending of the present invention discontinuous when emission, as shown in Figure 2 for arbitrary coded combination transmission channel (CCTrCH) that is in descending discontinuous emitting state, specifically may further comprise the steps,
Receive and detect the downstream signal energy of each frame (frame) behind the descending SBs that activates ", comprising: (frame, (subframe, downstream signal 5ms) receives respectively and detects each subframe in 10ms) to this frame.For the frame structure of TD-SCDMA, a frame (frame) comprises two sub-frame (subframe).
" judge whether the downstream signal in the downlink frame (frame) activates "; Comprise: when the downstream signal energy of each subframe (subframe) of this frame (frame) during all greater than thresholding T_active; Represent that the downstream signal in this downlink frame (frame) activates, thresholding T_active obtains through emulation according to wireless environment.
SBSP wherein is descending SB transmit cycle, is called SBSP (special burst dispatching cycle, special burst scheduling period), and unit is frame (frame).
Said process continues to carry out during descending discontinuous emission.
In sum; Subscriber equipment does not have detected situation through the counting of descending not state of activation has been judged base station SBs; When this situation takes place; Subscriber equipment produces the power control commands word raise downlink power and goes up and send out, and has still kept the closed loop procedure of downlink power control, the downlink power control reliability when having strengthened descending discontinuous emission.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1. the method for controlling downlink power of a TD-SCDMA system when the descending discontinuous emission of TD-SCDMA system, for arbitrary coded combination transmission channel that is in descending discontinuous emitting state, is characterized in that,
If subscriber equipment is judged the downstream signal in the downlink frame that receives and is not activated; Then " not state of activation " counter is added 1; If subscriber equipment is judged the numerical value of said " not state of activation " counter and is equaled special burst dispatching cycle; Then subscriber equipment produces the power control commands word raise downlink power and goes up and send out, the descending power control when accomplishing the descending discontinuous emission to TD-SCDMA system;
Wherein, Said subscriber equipment judges that whether the downstream signal in the downlink frame activates, and comprising: when the downstream signal energy of each subframe of this frame during all greater than thresholding T_active, represent that the downstream signal in this downlink frame activates; Wherein, thresholding T_active obtains through emulation according to wireless environment.
2. the method for claim 1 is characterized in that,
Before whether the downstream signal in the downlink frame that said subscriber equipment judgement receives activates, also comprise step,
A1, subscriber equipment produce the downlink power control command word according to the descending special burst that receives activation, and said " not state of activation " counter are carried out zero clearing;
A2, subscriber equipment receive and detect the downstream signal energy of each frame behind the descending special burst of said activation.
3. method as claimed in claim 2 is characterized in that,
Among the said step a2, the downstream signal energy of each frame behind the descending special burst that reception and detection activate, comprising: the downstream signal to each subframe in this frame receives respectively and detects.
4. method as claimed in claim 3 is characterized in that,
For the frame structure of TD-SCDMA system, a frame comprises two sub-frame.
5. method as claimed in claim 4 is characterized in that,
If said subscriber equipment is judged the downstream signal in the downlink frame that receives and is activated, then carries out said step a1.
6. method as claimed in claim 5 is characterized in that,
If the numerical value of said " not state of activation " counter is then carried out said step a2 less than special burst dispatching cycle.
7. method as claimed in claim 6 is characterized in that,
Said subscriber equipment produce the power control commands word of raising downlink power and on send out after, to said " not state of activation " counter O reset, carry out said step a2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810001036A CN101488785B (en) | 2008-01-15 | 2008-01-15 | Downlink power control method for TD-SCDMA system |
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| CN200810001036A CN101488785B (en) | 2008-01-15 | 2008-01-15 | Downlink power control method for TD-SCDMA system |
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| CN101488785B true CN101488785B (en) | 2012-09-05 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6804530B2 (en) * | 2000-12-29 | 2004-10-12 | Nortel Networks Limited | Method and apparatus for detection of forward and reverse DTX mode of operation detection in CDMA systems |
| CN1808935A (en) * | 2006-01-24 | 2006-07-26 | 中兴通讯股份有限公司 | Method of downlink power control during discontinuous downlink emission in radio communication system |
| CN101072055A (en) * | 2006-05-12 | 2007-11-14 | 中兴通讯股份有限公司 | Downlink power control method at downlink discontinuous transmission for wireless communication system |
| CN101075831A (en) * | 2006-10-10 | 2007-11-21 | 浙江华立通信集团有限公司 | Method for controlling transmitting power of TD-SCDMA mobile telecommunication system by uncontinuous transmission state value |
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- 2008-01-15 CN CN200810001036A patent/CN101488785B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6804530B2 (en) * | 2000-12-29 | 2004-10-12 | Nortel Networks Limited | Method and apparatus for detection of forward and reverse DTX mode of operation detection in CDMA systems |
| CN1808935A (en) * | 2006-01-24 | 2006-07-26 | 中兴通讯股份有限公司 | Method of downlink power control during discontinuous downlink emission in radio communication system |
| CN101072055A (en) * | 2006-05-12 | 2007-11-14 | 中兴通讯股份有限公司 | Downlink power control method at downlink discontinuous transmission for wireless communication system |
| CN101075831A (en) * | 2006-10-10 | 2007-11-21 | 浙江华立通信集团有限公司 | Method for controlling transmitting power of TD-SCDMA mobile telecommunication system by uncontinuous transmission state value |
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| CN101488785A (en) | 2009-07-22 |
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