CN1491048A - Closed-loop power controlling method in radio communication system - Google Patents
Closed-loop power controlling method in radio communication system Download PDFInfo
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- CN1491048A CN1491048A CNA021441928A CN02144192A CN1491048A CN 1491048 A CN1491048 A CN 1491048A CN A021441928 A CNA021441928 A CN A021441928A CN 02144192 A CN02144192 A CN 02144192A CN 1491048 A CN1491048 A CN 1491048A
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Abstract
This invention concerns a method of closed loop power control in wireless communication system. The method includes: the receiving end measures signal-to-jamming ratio value of receiving signal; and judging the signal-to-jamming ratio of received signal whether or not being in the range of threshold value; according the measuring value the receiving end informing transmit whether to make power adjustment. The current invention doesn't make power control to all operation users periodically, only make a control to the users that need power adjustment, namely to users of signal-to-jamming ratio exceeding certain range send down TPC order, reduce power control frequency, save code resources, assure basic effects of power control. This Invention is applied especially in the wireless communication systems that don't need to support fast mobile users, and some wireless communication system that have less resource for transferring definite purpose signaling.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the close-loop power controlling method in a kind of wireless communication system.
Background technology
For some self-interference wireless communication systems, as CDMA (Code Division Multiplex) communication system, the interior at one time code division multiplexing of a plurality of users, it is comparatively obvious to the restriction of power system capacity to make that channel fading and multipath disturb.In order to reduce interference level as far as possible, to up link, the transmitting power of each travelling carriage is maintained on the basis of just satisfying communicating requirement, and assurance simultaneously from base station distance and channel variation, can both obtain approximately equalised received power regardless of each travelling carriage when arriving the base station; To down link, need to reduce adjacent area interference and multipath interference.
For what reduce the common employing of interference level is power control techniques; By the energy of the receiver termination being collected mail number or the estimation of signal interference ratio, adjust the transmitter terminal transmitting power in real time, thereby compensated channel fading, reduce sign indicating number and divided interference between the user, improved communication quality.
Comparatively effectively Poewr control method is a close-loop power controlling method at present, the signal interference ratio that this method is measured based on receiving terminal, be directly to the estimation of the characteristic of channel of " transmitting terminal → receiving terminal " direction, and not as open loop power control, estimate the characteristic of channel by transmitting terminal, again it is applied in the emission.Described closed power control is divided into control of forward direction closed power and the control of back closed loop power again, is described below respectively:
The detailed process of forward direction closed power control is:
(1) travelling carriage has been known current signal interference ratio desired value SIR_target (dB of unit, down with), and T at regular intervals measures the signal interference ratio SIR (dB of unit, down with) of base station signal after the demodulation that receives;
(2) travelling carriage according to SIR and SIR_target relatively produce power control command, that is:
A, if SIR＞SIR_target, then produce order " down ", reduce base station transmitting power;
B, if SIR＜=SIR_target, then produce order " up ", improve base station transmitting power;
(3) to each travelling carriage, distribute one section up private resource, this power control command transmitting is seen off;
(4) base station receives the up private resource of all travelling carriages, according to demodulation result, by a fixed step size different mobile stations is carried out the different transmission power adjustment, realizes the control of forward direction closed power.
The detailed process of back closed loop power control is:
(1) base station has been known current signal interference ratio desired value SIR_target, and T at regular intervals measures the signal interference ratio SIR (j) (dB of unit, down with) of each mobile station signal after the demodulation that receives, and j represents different mobile stations;
(2) base station according to SIR (j) and SIR_target relatively produce power control commands about travelling carriage j, that is:
A, if SIR (j)＞SIR_target, then produce order " down ", reduce the transmitting power of travelling carriage;
B, if SIR (j)＜=SIR_target, then produce order " up ", improve the transmitting power of travelling carriage;
(3) to each travelling carriage j, distribute one section downlink dedicated resource, this power control command transmitting is seen off;
(4) travelling carriage receives the private resource of oneself, according to demodulation result, carries out the transmitting power adjustment by a fixed step size, realizes the control of back closed loop power.
Therefore, adopt traditional power control mode, need in the Transmission Time Interval of determining, there be professional user to carry out the power adjustment, and need utilizes private resource to guarantee to receive/send separately power control commands with the user that sign indicating number branch mode sent/received business simultaneously to all; Like this, power control is essential communication system for the resource of transmission dedicated signaling is relatively shorter, occurs not having enough private resources to carry out the situation of the transmission of power control commands through regular meeting.
Summary of the invention
The invention provides the close-loop power controlling method in a kind of wireless communication system, thereby reduced the power control frequency, saved the sign indicating number resource in the system effectively, and reduced the demand of closed power control system resource.
The object of the present invention is achieved like this: the close-loop power controlling method in a kind of wireless communication system comprises:
A, receiving terminal are measured the signal interference ratio value from the transmitting terminal received signal;
B, receiving terminal judge whether the signal interference ratio value of received signal is within the signal interference ratio threshold range of setting, if, execution in step c, otherwise, execution in step d;
C, do not notify transmitting terminal to carry out the transmitting power adjustment;
D, receiving terminal notice transmitting terminal carry out the transmitting power adjustment.
When carrying out forward power control, described receiving terminal is a travelling carriage, and transmitting terminal is the base station.
Described forward power control comprises:
A1, travelling carriage are determined the desired value of current signal interference ratio, and the signal interference ratio threshold range parameter of setting: upper threshold value and lower threshold value, and measure the signal interference ratio value of the base station signal after the demodulation that receives;
B1, travelling carriage judge whether the signal interference ratio value of base station signal is in the signal interference ratio threshold range of setting, if, execution in step c1 then, otherwise, execution in step d1;
C1, base station need not to carry out the power adjustment;
If the signal interference ratio value of d1 base station signal is greater than the desired value and the upper threshold value sum of signal interference ratio, then informing base station reduces signal transmission power; If the signal interference ratio value of base station signal is poor less than the desired value of signal interference ratio and lower threshold value, then informing base station improves signal transmission power.
When carrying out reverse power control, described receiving terminal is the base station, and transmitting terminal is a travelling carriage.
Described reverse power control comprises:
The desired value of current signal interference ratio is determined in a2, base station, and the signal interference ratio threshold range parameter of setting: upper threshold value and lower threshold value, and measure the signal interference ratio value of the mobile station signal after the demodulation that receives;
B2, base station judge whether the signal interference ratio value of mobile station signal is in the signal interference ratio threshold range of setting, if, execution in step c2 then, otherwise, execution in step d2;
C2, travelling carriage need not to carry out the power adjustment;
If the signal interference ratio value of d2 mobile station signal greater than the desired value and the upper threshold value sum of signal interference ratio, then notifies travelling carriage to reduce signal transmission power; If the signal interference ratio value of mobile station signal is poor less than the desired value of signal interference ratio and lower threshold value, then notify travelling carriage to improve signal transmission power.
Described receiving terminal notice transmitting terminal carries out the signaling that transmitting power is adjusted, and is to launch by the private resource that distributes.
Described receiving terminal notice transmitting terminal carries out the signaling that transmitting power is adjusted, and is to launch by the shared resource that distributes.
When described receiving terminal notice transmitting terminal carries out the transmitting power adjustment, the identify label of carrying travelling carriage.
By technique scheme as can be seen, the present invention no longer periodically has professional user to carry out power control to all, and the user who only needs is carried out power control, the just paroxysmal TPC of assigning (through-put power control) order of user that promptly signal interference ratio is exceeded certain limit, reduced the power control frequency, save the sign indicating number resource, also can guarantee basic power control effect.The present invention simultaneously can also adopt shared mode to pass on TPC order to lacking the situation of private resource, has reduced the demand of power control to system resource.The present invention is particularly useful for not needing to support fast moving user's wireless communication system and is used for transmitting the relatively more nervous system of resource of dedicated signaling.
Description of drawings
Fig. 1 is the concrete implementing procedure figure of forward direction closed power control;
Fig. 2 is the concrete implementing procedure figure of back closed loop power control.
Embodiment
Transmitting power in the wireless communication system is controlled, do not need periodically simultaneously each user to be carried out the power adjustment, only need carry out power control to the user who needs most gets final product, like this, the mode that the present invention can be by distributing a spot of system resource is carried out the transmitting power adjustment to the user of needs; The specific embodiment of the present invention is as shown in Figure 1 and Figure 2:
Close-loop power controlling method in the wireless communication system of the present invention comprises: control of forward direction closed power and the control of back closed loop power, wherein:
Described forward direction closed power control comprises:
Step 1: travelling carriage is determined current signal interference ratio desired value SIR_target, and T at regular intervals, measures the SIR (signal interference ratio) of base station signal after the demodulation that receives;
Simultaneously, definite signal interference ratio threshold range parameter of having set: upper threshold value Ut＞=0 and lower threshold value Lt＞=0;
Signal interference ratio threshold range parameter can be set at travelling carriage, also can be obtained by the upper layer network notice;
Step 2: whether the SIR that judges base station signal is in outside the signal interference ratio threshold range, if, execution in step 3, otherwise, execution in step 6;
Step 3: whether the SIR that judges base station signal greater than (SIR_target+Ut), if, execution in step 4, otherwise the SIR that determines base station signal is less than (SIR_target-Lt), execution in step 5;
Step 4: the travelling carriage informing base station reduces signal transmission power;
Step 5: the travelling carriage informing base station improves signal transmission power;
Step 6: the base station signal transmitting power is not adjusted.
Two kinds of situations of step 4 and step 5 can be distributed one section ascending resource, give the base station with power control command transmitting; For the situation that lacks private resource, also can distribute one section shared resource, launch together with the identify label of this transmitting mobile stations, promptly need comprise the identity authentication of corresponding transmitting mobile stations or receiving mobile in this shared resource; After the received power control command of base station, at first demodulate the travelling carriage identify label that application power is adjusted, and determine to adjust scheme at the signal transmission power of this travelling carriage according to the identify label of travelling carriage.
Described back closed loop power control comprises:
Step 11: current signal interference ratio desired value SIR_target is determined in the base station, and T at regular intervals measures the SIR (signal interference ratio) of mobile station signal after the demodulation that receives;
Simultaneously, definite signal interference ratio threshold range parameter of having set: upper threshold value Ut＞=0 and lower threshold value Lt＞=0;
Signal interference ratio threshold range parameter can also can be obtained by the upper layer network notice in base station sets;
Step 12: whether the SIR that judges mobile station signal is in outside the signal interference ratio threshold range, if, execution in step 13, otherwise, execution in step 16;
Step 13: whether the SIR that judges mobile station signal greater than (SIR_target+Ut), if, execution in step 14, otherwise the SIR that determines mobile station signal is less than (SIR_target-Lt), execution in step 15;
Step 14: base station notice travelling carriage reduces signal transmission power;
Step 15: base station notice travelling carriage improves signal transmission power;
Step 16: the mobile station signal transmitting power is not adjusted.
Two kinds of situations of step 14 and step 15 can be distributed one section private downlink resource, give travelling carriage with power control command transmitting; For the situation that lacks private resource, also can distribute one section shared resource, identify label together with this transmitting mobile stations is launched, after all travelling carriages that are in wait state receive this shared resource, at first demodulate the travelling carriage identify label that application power is adjusted, and the identify label of the travelling carriage that will carry in will ordering and the identities match of oneself, the travelling carriage that the match is successful carries out the adjustment of mobile station signal transmitting power according to demodulation result.
Though the present invention still periodically measures the SIR of each transmitting terminal that receives, have only when the SIR of transmitting terminal exceeds beyond the threshold range, just transmitting terminal is produced power control command, and distribute one section resource to be used to pass on power control command; Simultaneously, under the situation that does not have private resource, one section shared resource can also be distributed, the identity authentication of corresponding transmitting mobile stations or receiving mobile need be comprised in this shared resource.
The threshold value that the present invention introduces is with frequency that reduces power control and the saving that precision exchanges physical resource for, supports that to not needing fast moving user's wireless system is more suitable.Though the present invention does not have professional user to carry out power control to all in the power control cycle simultaneously, has adjusted the excessive or too small user of some power, power control effect does not have too big loss.
Claims (8)
1, the close-loop power controlling method in a kind of wireless communication system, its feature comprises:
A, receiving terminal are measured the signal interference ratio value from the received signal of transmitting terminal;
B, receiving terminal judge whether the signal interference ratio value of received signal is within the signal interference ratio threshold range of setting, if, execution in step c, otherwise, execution in step d;
C, do not notify transmitting terminal to carry out the transmitting power adjustment;
D, receiving terminal notice transmitting terminal carry out the transmitting power adjustment.
2, the close-loop power controlling method in the wireless communication system according to claim 1 is characterized in that: when carrying out forward power control, described receiving terminal is a travelling carriage, and transmitting terminal is the base station.
3, the close-loop power controlling method in the wireless communication system according to claim 2 is characterized in that described forward power control comprises:
A1, travelling carriage are determined the desired value of current signal interference ratio, and the signal interference ratio threshold range parameter of setting: upper threshold value and lower threshold value, and measure the signal interference ratio value of the base station signal after the demodulation that receives;
B1, travelling carriage judge whether the signal interference ratio value of base station signal is in the signal interference ratio threshold range of setting, if, execution in step c1 then, otherwise, execution in step d1;
C1, base station need not to carry out the power adjustment;
If the signal interference ratio value of d1 base station signal is greater than the desired value and the upper threshold value sum of signal interference ratio, then informing base station reduces signal transmission power; If the signal interference ratio value of base station signal is poor less than the desired value of signal interference ratio and lower threshold value, then informing base station improves signal transmission power.
4, the close-loop power controlling method in the wireless communication system according to claim 2 is characterized in that: when carrying out reverse power control, described receiving terminal is the base station, and transmitting terminal is a travelling carriage.
5, the close-loop power controlling method in the wireless communication system according to claim 4 is characterized in that described reverse power control comprises:
The desired value of current signal interference ratio is determined in a2, base station, and the signal interference ratio threshold range parameter of setting: upper threshold value and lower threshold value, and measure the signal interference ratio value of the mobile station signal after the demodulation that receives;
B2, base station judge whether the signal interference ratio value of mobile station signal is in the signal interference ratio threshold range of setting, if, execution in step c2 then, otherwise, execution in step d2;
C2, travelling carriage need not to carry out the power adjustment;
If the signal interference ratio value of d2 mobile station signal greater than the desired value and the upper threshold value sum of signal interference ratio, then notifies travelling carriage to reduce signal transmission power; If the signal interference ratio value of mobile station signal is poor less than the desired value of signal interference ratio and lower threshold value, then notify travelling carriage to improve signal transmission power.
6, according to the close-loop power controlling method in claim 1, the 3 or 5 described wireless communication systems, it is characterized in that described receiving terminal notice transmitting terminal carries out the signaling that transmitting power is adjusted, be to launch by the private resource that distributes.
7, according to the close-loop power controlling method in claim 1, the 3 or 5 described wireless communication systems, it is characterized in that described receiving terminal notice transmitting terminal carries out the signaling that transmitting power is adjusted, be to launch by the shared resource that distributes.
8, the close-loop power controlling method in the wireless communication system according to claim 7, when it is characterized in that described receiving terminal notice transmitting terminal carries out the transmitting power adjustment, the identify label of carrying travelling carriage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB021441928A CN1254123C (en) | 2002-10-18 | 2002-10-18 | Closed-loop power controlling method in radio communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021441928A CN1254123C (en) | 2002-10-18 | 2002-10-18 | Closed-loop power controlling method in radio communication system |
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| CN1491048A true CN1491048A (en) | 2004-04-21 |
| CN1254123C CN1254123C (en) | 2006-04-26 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7512411B2 (en) | 2003-02-13 | 2009-03-31 | Ntt Docomo, Inc. | Radio communication system, radio network controller, mobile station and down link transmission power control method |
| CN101083493B (en) * | 2007-04-24 | 2011-04-20 | 中兴通讯股份有限公司 | Method of closed loop power control adaptive control of CDMA system |
| CN101188442B (en) * | 2006-11-15 | 2011-08-10 | 中兴通讯股份有限公司 | Closed loop power control method |
| CN1874178B (en) * | 2005-05-31 | 2012-02-08 | Vixs系统公司 | Adjusting transmit power of a wireless communication device |
| CN103621157A (en) * | 2011-06-13 | 2014-03-05 | 交互数字专利控股公司 | Method for controlling transmit power of a mobile station |
| WO2014059659A1 (en) | 2012-10-19 | 2014-04-24 | Telefonaktiebolaget L M Ericsson(Publ) | Method and apparatus for power control in wireless communication network |
| WO2018040258A1 (en) * | 2016-08-30 | 2018-03-08 | 中兴通讯股份有限公司 | Method, apparatus and device for adjusting signal transmission power of base station, and storage medium |
| CN109041189A (en) * | 2018-07-20 | 2018-12-18 | 深圳芯之联科技有限公司 | A kind of transmission power control method and device of wireless telecom equipment |
| CN113572487A (en) * | 2021-07-23 | 2021-10-29 | 闻泰通讯股份有限公司 | Radio frequency signal clutter suppression method, base station and terminal |
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2002
- 2002-10-18 CN CNB021441928A patent/CN1254123C/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7512411B2 (en) | 2003-02-13 | 2009-03-31 | Ntt Docomo, Inc. | Radio communication system, radio network controller, mobile station and down link transmission power control method |
| CN1874178B (en) * | 2005-05-31 | 2012-02-08 | Vixs系统公司 | Adjusting transmit power of a wireless communication device |
| CN101188442B (en) * | 2006-11-15 | 2011-08-10 | 中兴通讯股份有限公司 | Closed loop power control method |
| CN101083493B (en) * | 2007-04-24 | 2011-04-20 | 中兴通讯股份有限公司 | Method of closed loop power control adaptive control of CDMA system |
| US9451555B2 (en) | 2011-06-13 | 2016-09-20 | Interdigital Patent Holdings, Inc. | Method for controlling transmit power of a mobile station |
| CN103621157B (en) * | 2011-06-13 | 2018-03-23 | 交互数字专利控股公司 | For the method for the transmission power for controlling movement station |
| CN103621157A (en) * | 2011-06-13 | 2014-03-05 | 交互数字专利控股公司 | Method for controlling transmit power of a mobile station |
| US9832738B2 (en) | 2011-06-13 | 2017-11-28 | Interdigital Patent Holdings, Inc. | Method for controlling transmit power of a mobile station |
| CN104871604A (en) * | 2012-10-19 | 2015-08-26 | 爱立信(中国)通信有限公司 | Method and apparatus for power control in wireless communication network |
| EP2910067A4 (en) * | 2012-10-19 | 2016-05-25 | Ericsson Telefon Ab L M | Method and apparatus for power control in wireless communication network |
| US9681449B2 (en) | 2012-10-19 | 2017-06-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for power control in wireless communication network |
| WO2014059659A1 (en) | 2012-10-19 | 2014-04-24 | Telefonaktiebolaget L M Ericsson(Publ) | Method and apparatus for power control in wireless communication network |
| CN104871604B (en) * | 2012-10-19 | 2019-06-07 | 爱立信(中国)通信有限公司 | Method and apparatus for power control in cordless communication network |
| WO2018040258A1 (en) * | 2016-08-30 | 2018-03-08 | 中兴通讯股份有限公司 | Method, apparatus and device for adjusting signal transmission power of base station, and storage medium |
| CN107787037A (en) * | 2016-08-30 | 2018-03-09 | 中兴通讯股份有限公司 | A kind of method of adjustment and device of base station signal transmission power |
| CN109041189A (en) * | 2018-07-20 | 2018-12-18 | 深圳芯之联科技有限公司 | A kind of transmission power control method and device of wireless telecom equipment |
| CN109041189B (en) * | 2018-07-20 | 2021-07-30 | 深圳全志在线有限公司 | Transmission power control method and device of wireless communication equipment |
| CN113572487A (en) * | 2021-07-23 | 2021-10-29 | 闻泰通讯股份有限公司 | Radio frequency signal clutter suppression method, base station and terminal |
| WO2023000781A1 (en) * | 2021-07-23 | 2023-01-26 | 闻泰通讯股份有限公司 | Radio frequency signal clutter suppression method, base station, and terminal |
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