CN101741434A - Closed loop power control method - Google Patents
Closed loop power control method Download PDFInfo
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- CN101741434A CN101741434A CN200810226154A CN200810226154A CN101741434A CN 101741434 A CN101741434 A CN 101741434A CN 200810226154 A CN200810226154 A CN 200810226154A CN 200810226154 A CN200810226154 A CN 200810226154A CN 101741434 A CN101741434 A CN 101741434A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a closed loop power control method which comprises the following steps of: carrying out combined detection on a received data frame by a signal emitting end to obtain a transport format combination indicator (TFCI) signal of a coded composite transport channel carried by the data frame and a transmit power control (TPC) command word fed back by a signal receiving end; decoding the TFCI by the signal emitting end; judging whether the TPC command word is effective or not according to a decoding result of the TFCI; and if so, adjusting the emitting power of a special channel according to the TPC command word. The invention can enhance the stability and the reliability of closed loop power control.
Description
Technical field
The present invention relates to the power control techniques in a kind of wireless communication system, particularly relate to the close-loop power controlling method in TD SDMA (TD_SCDMA) system.
Background technology
The closed power control technology is a key technology in the TD_SCDMA system, this technology can well overcome at " edge problem " of mobile communication system and " near-far interference ", can be on the required minimum signal to noise ratio basis of the signal of communication quality between assurance base station and the user terminal, minimizing is to the interference of other users in the same Radio Resource, thus the raising power system capacity.
In the existing closed power control technology, the signal transmitting terminal is a TPC command word of utilizing the link feedback by signal receiving end, and its transmitting power is adjusted.This TPC command word is that communicating pair is used to the indication information of asking the other side to increase or reducing through-put power.For example, the base station is adjusted the transmitting power of its down link according to the TPC command word of user terminal (UE) from uplink feedback.
According to 3GPP TS 25.221 agreements, the transmission of power control command in the TD_SCDMA system (TPC) command word is carried out in business time-slot.Fig. 1 has provided the position of TPC command word in business time-slot.To each UE, TPC command word information only sends once in a 5ms subframe.For each distributed time slot, whether it carries TPC command word information is to be notified respectively by high-level signaling.If a time slot carries TPC command word information, then the transmission of this TPC command word is to finish at the data division of business time-slot, and they use the physical channel that has minimum physical channel sequence number in this time slot to send.
Can also carry transformat combination (TFCI) indication (referring to shown in Figure 1) in the business time-slot of TD_SCDMA system, this indication is used to notify the transformat combination of the current activation of recipient, and reciever is taken this and can the data that receive be correctly decoded.Whether carry TFCI in the time slot, determined by consultation when the call setup by the high level of communicating pair, and by high level physical layer is configured, 4 parts that complete TFCI is assigned in two subframes send (referring to Fig. 1).The chnnel coding of TFCI is independent of the data division in the time slot, adopts single order or second order Rui De-Muller (Reed-Muller) sign indicating number to encode, and the spread spectrum of TFCI is identical with the data division of respective channel.
In actual applications, behind the wireless channel arriving signal receiving terminal of each time slot data through complexity, the situation that flase drop or false retrieval all might occur, especially set up in flow process and the switching flow in Radio Resource control (RRC), base station one side sets up down link earlier, and user terminal does not send effective up-downgoing data this moment, and up joint-detection then may exist flase drop and false retrieval.That is to say that the detected TPC command word in base station may be wrong information, and utilizes wrong TPC command word to control the adjustment of transmitting power, will cause the mistuning of dedicated channel power, increases the interference to other users in the same Radio Resource.
This shows, because the unreliability of TPC command word in the actual transmissions, make existing closed power control technology scheme deficient in stability and reliability.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of close-loop power controlling method, and this method can strengthen the stability and the reliability of closed power control.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of close-loop power controlling method, this method may further comprise the steps:
A, signal transmitting terminal carry out joint-detection to the Frame that receives, and obtain the TFCI signal of the coded combination transmission channel that described Frame carries and the TPC command word of signal receiving end feedback;
B, signal transmitting terminal are deciphered described TFCI, according to the decode results of described TFCI, judge whether described TPC command word is effective, if effectively, then according to described TPC command word the transmitting power of its dedicated channel is adjusted.
Preferably, further comprise among the described step a:
By described joint-detection, obtain the signal interference ratio (SIR) after the described Frame demodulation;
Further comprise step between described step a and the b:
Judge described SIR whether greater than default threshold value, if greater than would change step b over to.
Preferably, according to the decode results of described TFCI, judge that whether described TPC command word effectively is among the described step b:
Judge that described decode results is whether in default TFCI scope, if determine that then described TFCI is effective, otherwise determine that described TFCI is invalid.
Preferably, be adjusted into according to the transmitting power of described TPC command word among the described step b its dedicated channel:
B1, judge whether described TPC command word indicates the increase channel transmitting power, if then change step b2 over to, otherwise change step b4 over to;
B2, channel transmitting power is increased a default adjustment step-length, obtain new transmitting power;
B3, judge that described new transmitting power is whether greater than the maximum transmission power of default described channel, if greater than, then the current transmit power of described channel is set to described maximum transmission power, otherwise the current transmit power of described channel is set to described new transmitting power, withdraws from step b;
B4, channel transmitting power is reduced by a default adjustment step-length, obtain new transmitting power;
B5, judge that described new transmitting power is whether less than the minimum emissive power of default described channel, if less than, then the current transmit power of described channel is set to described minimum emissive power, otherwise the current transmit power of described channel is set to described new transmitting power.
In sum, the close-loop power controlling method that the present invention proposes, by determining the confidence level of TPC command word earlier, guaranteeing under the effective situation of this TPC command word, utilize the TPC command word to carry out power control again, make the present invention can overcome existing closed power controlling schemes deficient in stability and reliability problems.
Description of drawings
Fig. 1 is TPC information and the position view of TFCI information in business time-slot;
Fig. 2 is a schematic flow sheet of the present invention;
Fig. 3 is the schematic flow sheet of the embodiment of the invention one;
Fig. 4 is the schematic flow sheet of step 304 among Fig. 3.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Basic thought of the present invention is: at first the validity of the TPC command word of signal receiving end feedback is judged at the signal transmitting terminal, guaranteeing under its effective situation, utilize the TPC command word to carry out power control again, to overcome unsteadiness and the unreliability that occurs the closed power control that the situation of flase drop and false retrieval causes because of the TPC command word.
Fig. 2 is a schematic flow sheet of the present invention, and the present invention mainly comprises as shown in Figure 2:
In actual applications, described signal transmitting terminal can be that the base station also can be UE, and correspondingly, described signal receiving end can be UE or base station.
In this step, by at first utilizing the decode results of TFCI, whether the Frame of determining to carry this TFCI is credible, if it is credible then illustrate that the entrained described TPC command word of this Frame is effective, have only in the case, just can utilize this TPC command word that the transmitting power of the dedicated channel of signal transmitting terminal is adjusted, like this, can avoid utilizing of the mistuning of wrong TPC command word information the transmitting power of signal transmitting terminal.
In actual applications, in order further to improve the accuracy that the present invention judges TPC command word validity, SIR after this Frame demodulation that obtains in the time of can also utilizing described joint-detection earlier, determine the reliability of the TPC command word in this Frame, utilize the decode results of described TFCI then on this basis again, further judge the validity of described TPC command word.
Fig. 3 is the schematic flow sheet of the embodiment of the invention one.As shown in Figure 3, this embodiment comprises
Here, the SIR that obtains in this step, TPC command word and TFCI all can obtain in existing joint detection process, specifically how to realize, repeat no more herein.
In actual applications, described threshold value is determined by emulation and outfield network planning network optimization work, in this specific embodiments, can be set to 0dB, if described SIR, then thinks the TPC command word reliability height of this frame greater than this threshold value, at this moment, can utilize subsequent step to continue the validity of this TPC command word is judged, otherwise, think that then TPC command word reliability in this Frame than low, can not utilize this TPC command word to carry out the power adjustment.
In this step, signal receiving end carries out TFCI decoding according to the pre-configured time slot format of joint detection results in the step 301 and system, and concrete interpretation method is that those skilled in the art are known, repeats no more herein.
Here, according to the decode results of described TFCI, judge described TPC command word whether effective method can for:
Judge that described decode results is whether in default TFCI scope, if determine that then described TFCI is effective, otherwise determine that described TFCI is invalid.
For example, for adaptive multi-rate coding (AMR) 12.2K business, TFCI maximum default in the agreement is 6 (referring to agreement 3GPP TS 34.108), if the TFCI decode results that obtains in this step is 3, then it is in this default TFCI scope, the up link that then can determine to transmit described Frame is effective, be that the described Frame data of carrying are effective, thereby can judge that described TPC command word is effective, can utilize this TPC command word that the transmitting power of signal transmitting terminal dedicated channel is adjusted.
This step adopts existing power regulating method to realize getting final product, and for example, as shown in Figure 4, step 304 can realize by following idiographic flow, but be not limited thereto:
The current transmit power of step 404, described channel is set to described maximum transmission power, withdraws from.
The current transmit power of step 405, described channel is set to described new transmitting power, withdraws from.
The current transmit power of step 408, described channel is set to described minimum emissive power, withdraws from.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a close-loop power controlling method is characterized in that, this method may further comprise the steps:
A, signal transmitting terminal carry out joint-detection to the Frame that receives, and obtain the transformat combination indication TFCI signal of the coded combination transmission channel that described Frame carries and the power control command TPC command word of signal receiving end feedback;
B, signal transmitting terminal are deciphered described TFCI, according to the decode results of described TFCI, judge whether described TPC command word is effective, if effectively, then according to described TPC command word the transmitting power of its dedicated channel is adjusted.
2. method according to claim 1 is characterized in that, further comprises among the described step a:
By described joint-detection, obtain the signal interference ratio SIR after the described Frame demodulation;
Further comprise step between described step a and the b:
Judge described SIR whether greater than default threshold value, if greater than would change step b over to.
3. method according to claim 1 and 2 is characterized in that, according to the decode results of described TFCI, judges that whether described TPC command word effectively is among the described step b:
Judge that described decode results is whether in default TFCI scope, if determine that then described TFCI is effective, otherwise determine that described TFCI is invalid.
4. method according to claim 1 is characterized in that, is adjusted into according to the transmitting power of described TPC command word to its dedicated channel among the described step b:
B1, judge whether described TPC command word indicates the increase channel transmitting power, if then change step b2 over to, otherwise change step b4 over to;
B2, channel transmitting power is increased a default adjustment step-length, obtain new transmitting power;
B3, judge that described new transmitting power is whether greater than the maximum transmission power of default described channel, if greater than, then the current transmit power of described channel is set to described maximum transmission power, otherwise the current transmit power of described channel is set to described new transmitting power, withdraws from step b;
B4, channel transmitting power is reduced by a default adjustment step-length, obtain new transmitting power;
B5, judge that described new transmitting power is whether less than the minimum emissive power of default described channel, if less than, then the current transmit power of described channel is set to described minimum emissive power, otherwise the current transmit power of described channel is set to described new transmitting power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102261547A CN101741434B (en) | 2008-11-14 | 2008-11-14 | Closed loop power control method |
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| CN2008102261547A CN101741434B (en) | 2008-11-14 | 2008-11-14 | Closed loop power control method |
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| CN101741434A true CN101741434A (en) | 2010-06-16 |
| CN101741434B CN101741434B (en) | 2013-04-24 |
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| CN2008102261547A Expired - Fee Related CN101741434B (en) | 2008-11-14 | 2008-11-14 | Closed loop power control method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391605A (en) * | 2012-05-07 | 2013-11-13 | 鼎桥通信技术有限公司 | Transmission power control method and device |
| CN103428838A (en) * | 2012-05-18 | 2013-12-04 | 普天信息技术研究院有限公司 | Close-loop power control method |
| CN103533581A (en) * | 2012-07-02 | 2014-01-22 | 中兴通讯股份有限公司 | Method and apparatus for channel adjusting |
| CN104902548A (en) * | 2014-03-05 | 2015-09-09 | 中兴通讯股份有限公司 | Method and device for controlling transmitting power of mobile terminal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1067730A1 (en) * | 1999-07-02 | 2001-01-10 | Alcatel | Determining the transmission quality of a radio channel |
| WO2002009309A2 (en) * | 2000-07-26 | 2002-01-31 | Koninklijke Philips Electronics N.V. | Power control in a radio communication system |
| US7529220B2 (en) * | 2002-07-31 | 2009-05-05 | Interdigital Technology Corporation | Wireless receiver |
| JP4786709B2 (en) * | 2006-04-11 | 2011-10-05 | 株式会社エヌ・ティ・ティ・ドコモ | Transmission power control method and mobile terminal device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391605A (en) * | 2012-05-07 | 2013-11-13 | 鼎桥通信技术有限公司 | Transmission power control method and device |
| CN103391605B (en) * | 2012-05-07 | 2016-06-08 | 鼎桥通信技术有限公司 | Transmission power control method and device |
| CN103428838A (en) * | 2012-05-18 | 2013-12-04 | 普天信息技术研究院有限公司 | Close-loop power control method |
| CN103533581A (en) * | 2012-07-02 | 2014-01-22 | 中兴通讯股份有限公司 | Method and apparatus for channel adjusting |
| CN104902548A (en) * | 2014-03-05 | 2015-09-09 | 中兴通讯股份有限公司 | Method and device for controlling transmitting power of mobile terminal |
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| CN101741434B (en) | 2013-04-24 |
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