CN101488786B - Uplink power control method for TD-SCDMA system - Google Patents
Uplink power control method for TD-SCDMA system Download PDFInfo
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- CN101488786B CN101488786B CN 200810001037 CN200810001037A CN101488786B CN 101488786 B CN101488786 B CN 101488786B CN 200810001037 CN200810001037 CN 200810001037 CN 200810001037 A CN200810001037 A CN 200810001037A CN 101488786 B CN101488786 B CN 101488786B
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Abstract
The invention discloses an uplink power control method of a time-division synchronous CDMA access system, when the uplink of the time-division synchronous CDMA access system is transmitted discontinuously, for any one coding combined transmission channel positioned in an uplink discontinuous transmitting state, if the base station judges that the uplink signal in the uplink frame is not activated, so that a counter in no activated state adds 1, if the base station judges that the numerical value of the counter in no activated state is equal to the special burst generating period, so that the base station generates and distributes the power control command word for raising the uplink power to complete the uplink power control of the time-division synchronous CDMA access system when the uplink is transmitted discontinuously. According to the invention, even the uplink can not detect the SBs, the base station still can generate an appropriate power control command word to enable the terminal to improve the power and overcome the deterioration of wireless channels during the uplink is transmitted discontinuously.
Description
Technical field
The present invention relates to a kind of wireless communication field, ascending power control method when relating more specifically to the up discontinuous emission of a kind of TD SDMA access (Time Division-Synchronous Code Division Multiple Access, TD-SCDMA) system.
Background technology
The close-loop power control technology is the basic fundamental in the TD-SCDMA system, and in close-loop power control 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.Take uplink power control as example, after the base station receives signal from subscriber equipment, determine the transmitting power whether needs increase or reduce subscriber equipment according to the sir measurement value to upward signal, and produce corresponding power control command.The base station passes to subscriber equipment with power control command by descending feedback channel, and subscriber equipment is adjusted uplink transmission power after receiving 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 implemented take coded combination transmission channel (CCTrCH) as unit discontinuous emission (DTX).When discontinuous emission (DTX) 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), the descending SB emission 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 positive role.When high level when a certain TTI provides data again to coded combination transmission channel (CCTrCH), terminal withdraws from up discontinuous emitting state immediately at this TTI, recovers the emission of upstream data.
When up discontinuous emission was implemented, terminal periodic was launched up SBs in order to keep link, and the base station can produce appropriate power control commands word according to the SBs that receives and carry out uplink closed loop.Under the regular situation, when up discontinuous emission occured, base station and terminal relied on up SBs to keep the process of closed-loop power control in the manner described above.
After up discontinuous emission occured, under the impaired condition of some wireless channel, when being caused the path loss sudden change such as wireless channel blocks suddenly, the base station possibly can't detect up SBs, and at this moment just there is certain problem in above-mentioned conventional circule power control method.After up discontinuous emission occurs, when the base station can't detect up SBs, the base station just can't produce by the measurement of upward signal suitable power control commands word in a conventional manner, if this channel degradation condition continues always, the base station can't be effectively utilized closed-loop power control and improve ascending power, and so that up SBs is continued to detect in the base station.So the base station is after up discontinuous emission occurs, need to someways distinguish " terminal does not transmit " and " terminal transmits and the base station can't detect " both of these case, even so that up can't detect SBs the time, the base station can produce still that suitable power control commands word comes so that terminal improves the deterioration that power overcomes the wireless channel during the up discontinuous emission.
Summary of the invention
Technical problem to be solved by this invention provides a kind of ascending power control method of TD-SCDMA system, even so that up can't detect SBs the time, the base station can produce still that suitable power control commands word comes so that terminal improves the deterioration that power overcomes the wireless channel during the up discontinuous emission.
In order to address the above problem, the invention provides a kind of ascending power control method of TD-SCDMA system, when the up discontinuous emission of TD-SCDMA system, for arbitrary coded combination transmission channel that is in up discontinuous emitting state
If the base station is judged the upward signal in the uplink frame that receives and is not activated, then " not state of activation " counter is added 1, if the base station is judged the numerical value of described " not state of activation " counter and is equaled the special burst generating period, then the base station produces and to raise the power control commands word of up-link power and issue, the uplink power control when finishing the up discontinuous emission to TD-SCDMA system.
Further, said method also can comprise, before whether the upward signal in the uplink frame that the judgement of described base station receives activates, also comprises step,
A1, base station produce the uplink power control command word according to the up special burst that receives activation, and described " not state of activation " counter are carried out zero clearing;
A2, base station receive and detect the upward signal energy of each frame behind the up special burst of described activation.
Further, said method also can comprise, among the described step a2, receives and detect the upward signal energy of each frame behind the up special burst that activates, and comprising: the upward 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 subframes.
Further, said method also can comprise, described base station judges whether the upward signal in the uplink frame activates, comprise: when the upward signal energy of each subframe of this frame during all greater than thresholding T_active, represent that the upward signal in this uplink frame activates, wherein, thresholding T_active obtains by emulation according to wireless environment.
Further, said method also can comprise, activates if the upward signal in the uplink frame that receives is judged in described base station, then carries out described step a1.
Further, said method also can comprise, if the numerical value of described " not state of activation " counter is then carried out described step a2 less than the special burst generating period.
Further, said method also can comprise, after the generation of described base station is raised the power control commands word of up-link power and issued, to described " not state of activation " counter O reset, carries out described step a2.
Compared with prior art, use the present invention, the situation that the base station does not detect by the counting of up not state of activation having been judged terminal emission SBs, when this situation occurs, the base station generation is raised the power control commands word of up-link power and is issued, and has still kept the closed loop procedure of uplink power control.So that up can't detect SBs the time, the base station can produce still that suitable power control commands word comes so that terminal improves the deterioration that power overcomes the wireless channel during the up discontinuous emission.
Description of drawings
Fig. 1 is the sequential schematic diagram of TD-SCDMA system uplink discrete state;
Ascending power control method flow chart when Fig. 2 is the discontinuous emission of TD-SCDMA system uplink of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Main design of the present invention is, when the discontinuous emission of TD-SCDMA system uplink, and for arbitrary coded combination transmission channel (CCTrCH) that is in up discontinuous emitting state,
If the base station is judged the upward signal in the uplink frame (frame) that receives and is not activated, then " not state of activation " counter N_inactive is added 1, if the base station is judged the numerical value of " not state of activation " counter N_inactive and is equaled SBGP, then the base station produces and to raise the power control commands word of up-link power and issue, the uplink power control when finishing the up discontinuous emission to the TD-SCDMA system.
Ascending power control method during the discontinuous emission of TD-SCDMA system uplink of the present invention for arbitrary coded combination transmission channel (CCTrCH) that is in up discontinuous emitting state, as shown in Figure 2, specifically may further comprise the steps:
The upward signal energy of each frame (frame) behind the up SBs that reception and detection activate ", comprising: the upward signal to each subframe (subframe, 5ms) in this frame (frame, 10ms) receives respectively and detects.For the frame structure of TD-SCDMA, a frame (frame) comprises two subframes (subframe).
" judge whether the upward signal in the uplink frame (frame) activates ", comprise: when the upward signal energy of each subframe (subframe) of this frame (frame) during all greater than thresholding T_active, represent that the upward signal among this up frame activates, thresholding T_active obtains by emulation according to wireless environment.
SBGP wherein is the up SB emission cycle, is called SBGP (special burst generating period, special burst generation period), and unit is frame (frame).
Said process continues to carry out during up discontinuous emission.
In sum, the situation that the base station does not detect by the counting of up not state of activation having been judged terminal emission SBs, when this situation occurs, the base station generation is raised the power control commands word of up-link power and is issued, still kept the closed loop procedure of uplink power control, the uplink power control reliability when having strengthened up discontinuous emission.
The above; only for the better embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; 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 ascending power control method of a TD-SCDMA system when the up discontinuous emission of TD-SCDMA system, for arbitrary coded combination transmission channel that is in up discontinuous emitting state, is characterized in that,
Do not activate if the upward signal in the uplink frame that receives is judged in the base station, then " not state of activation " counter is added 1, activate if the upward signal in the uplink frame that receives is judged in the base station, then zero clearing described " not state of activation " counter; If the base station is judged the numerical value of described " not state of activation " counter and is equaled the special burst generating period, then the base station produces and to raise the power control commands word of up-link power and issue, the uplink power control when finishing the up discontinuous emission to TD-SCDMA system; Wherein, described base station judges that whether the upward signal in the uplink frame activates, and comprising: when the upward signal energy of each subframe of this frame during all greater than thresholding T_active, represent that the upward signal in this uplink frame activates, wherein, thresholding T_active obtains by emulation according to wireless environment.
2. the method for claim 1 is characterized in that,
Before whether the upward signal in the uplink frame that the judgement of described base station receives activates, also comprise step,
A1, base station produce the uplink power control command word according to the up special burst that receives activation, and described " not state of activation " counter are carried out zero clearing;
A2, base station receive and detect the upward signal energy of each frame behind the up special burst of described activation.
3. method as claimed in claim 2 is characterized in that,
Among the described step a2, the upward signal energy of each frame behind the up special burst that reception and detection activate, comprising: the upward 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 subframes.
5. method as claimed in claim 4 is characterized in that,
Activate if the upward signal in the uplink frame that receives is judged in described base station, then carry out described step a1.
6. method as claimed in claim 5 is characterized in that,
If the numerical value of described " not state of activation " counter is then carried out described step a2 less than the special burst generating period.
7. method as claimed in claim 6 is characterized in that,
After the generation of described base station is raised the power control commands word of up-link power and issued, to described " not state of activation " counter O reset, carry out described step a2.
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| CN 200810001037 CN101488786B (en) | 2008-01-15 | 2008-01-15 | Uplink power control method for TD-SCDMA system |
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| CN 200810001037 CN101488786B (en) | 2008-01-15 | 2008-01-15 | Uplink power control method for TD-SCDMA system |
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| CN101488786B true CN101488786B (en) | 2013-02-27 |
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| CN101711054B (en) * | 2009-12-21 | 2012-05-02 | 北京北方烽火科技有限公司 | Method and system for controlling long term evolution (LTE) uplink power |
| CN103152814B (en) * | 2011-12-06 | 2015-08-12 | 联芯科技有限公司 | The confirmation method of synchronous code and device thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1490964A (en) * | 2002-10-16 | 2004-04-21 | 华为技术有限公司 | Power controlling method for CDMA 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 |
| EP1995880A1 (en) * | 2007-05-23 | 2008-11-26 | Dibcom | Power management method and corresponding device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1490964A (en) * | 2002-10-16 | 2004-04-21 | 华为技术有限公司 | Power controlling method for CDMA 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 |
| EP1995880A1 (en) * | 2007-05-23 | 2008-11-26 | Dibcom | Power management method and corresponding device |
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