CN101741434B - Closed loop power control method - Google Patents
Closed loop power control method Download PDFInfo
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- CN101741434B CN101741434B CN2008102261547A CN200810226154A CN101741434B CN 101741434 B CN101741434 B CN 101741434B CN 2008102261547 A CN2008102261547 A CN 2008102261547A CN 200810226154 A CN200810226154 A CN 200810226154A CN 101741434 B CN101741434 B CN 101741434B
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- power
- command word
- tpc command
- tfci
- transmitting power
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 close-loop 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 close-loop power control technology, the signal transmitting terminal is the 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 TS25.221 agreement, 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 the time slot of each distribution, 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 for notifying 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) code 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 in Radio Resource control (RRC) Establishing process and switching flow, base station one side sets up first down link, 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, so that existing close-loop power control technical 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 the method can strengthen stability and the reliability of close-loop 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, the 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 whether in default TFCI scope, if so, determines 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 to its dedicated channel among the described step b:
B1, judge the transmitting power that whether described TPC command word indicates increases channel, if so, then change step b2 over to, otherwise change step b4 over to;
B2, the transmitting power of channel 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, the transmitting power of channel 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 first the confidence level of TPC command word, guaranteeing in the effective situation of this TPC command word, recycling TPC command word is carried out power control, so that the present invention can overcome the problem of existing close-loop power control scheme deficient in stability and reliability.
Description of drawings
Fig. 1 is TPC information and the position view of TFCI information in business time-slot;
Fig. 2 is 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 in its effective situation, recycling TPC command word is carried out power control, to overcome unsteadiness and the unreliability that occurs the close-loop power control that the situation of flase drop and false retrieval causes because of the TPC command word.
Fig. 2 is 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 credible then illustrate that the entrained described TPC command word of this Frame is effective, only have 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 wrong TPC command word information to the mistuning of the transmitting power of signal transmitting terminal.
In actual applications, in order further to improve the present invention to TPC command word validity Accuracy of Judgement, SIR after this Frame demodulation that obtains in the time of can also utilizing described joint-detection first, determine the reliability of the TPC command word in this Frame, then recycle on this basis the decode results of described TFCI, 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, thinks then that the TPC command word reliability of this frame is high 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 the TPC command word reliability ratio in this Frame is 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 the 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 whether in default TFCI scope, if so, determines that then described TFCI is effective, otherwise determine that described TFCI is invalid.
For example, professional for adaptive multi-rate coding (AMR) 12.2K, TFCI maximum default in the agreement is 6 (referring to agreement 3GPP TS34.108), 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 to this:
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 for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. close-loop power controlling method is characterized in that the 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 the dedicated channel of signal transmitting terminal is adjusted;
Wherein, 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 whether in default TFCI scope, if so, determines that then described TPC command word is effective, otherwise determine that described TPC command word is invalid.
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 is characterized in that, is adjusted into according to the transmitting power of described TPC command word to the dedicated channel of signal transmitting terminal among the described step b:
B1, judge the transmitting power that whether described TPC command word indicates increases channel, if so, then change step b2 over to, otherwise change step b4 over to;
B2, the transmitting power of channel 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 dedicated channel, if greater than, then the current transmit power of described dedicated channel is set to described maximum transmission power, otherwise the current transmit power of described dedicated channel is set to described new transmitting power, withdraws from step b;
B4, the transmitting power of channel 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 dedicated channel, if less than, then the current transmit power of described dedicated channel is set to described minimum emissive power, otherwise the current transmit power of described dedicated 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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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102261547A CN101741434B (en) | 2008-11-14 | 2008-11-14 | Closed loop power control method |
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| CN101741434A CN101741434A (en) | 2010-06-16 |
| CN101741434B true 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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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103391605B (en) * | 2012-05-07 | 2016-06-08 | 鼎桥通信技术有限公司 | Transmission power control method and device |
| CN103428838B (en) * | 2012-05-18 | 2016-05-04 | 普天信息技术研究院有限公司 | Close-loop power controlling 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 |
Citations (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 |
| CN1411636A (en) * | 2000-07-26 | 2003-04-16 | 皇家菲利浦电子有限公司 | Radio communication system |
| WO2004012348A2 (en) * | 2002-07-31 | 2004-02-05 | Interdigital Technology Corporation | Improved cdma tdd receiver |
| WO2007119753A1 (en) * | 2006-04-11 | 2007-10-25 | Mitsubishi Electric Corporation | Transmission power control method and moving terminal device |
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- 2008-11-14 CN CN2008102261547A patent/CN101741434B/en not_active Expired - Fee Related
Patent Citations (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 |
| CN1411636A (en) * | 2000-07-26 | 2003-04-16 | 皇家菲利浦电子有限公司 | Radio communication system |
| WO2004012348A2 (en) * | 2002-07-31 | 2004-02-05 | Interdigital Technology Corporation | Improved cdma tdd receiver |
| WO2007119753A1 (en) * | 2006-04-11 | 2007-10-25 | Mitsubishi Electric Corporation | Transmission power control method and moving terminal device |
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| CN101741434A (en) | 2010-06-16 |
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Denomination of invention: Closed loop power control method Effective date of registration: 20131210 Granted publication date: 20130424 Pledgee: Bank of Beijing Limited by Share Ltd. Century City Branch Pledgor: PETEVIO INSTITUTE OF TECHNOLOGY Co.,Ltd. Registration number: 2013990000954 |
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Date of cancellation: 20151102 Granted publication date: 20130424 Pledgee: Bank of Beijing Limited by Share Ltd. Century City Branch Pledgor: POTEVIO INFORMATION TECHNOLOGY Co.,Ltd. Registration number: 2013990000954 |
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