CN1783745A - Down line power control method for radio communication system while initial establishing radio link - Google Patents
Down line power control method for radio communication system while initial establishing radio link Download PDFInfo
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- CN1783745A CN1783745A CN 200410096566 CN200410096566A CN1783745A CN 1783745 A CN1783745 A CN 1783745A CN 200410096566 CN200410096566 CN 200410096566 CN 200410096566 A CN200410096566 A CN 200410096566A CN 1783745 A CN1783745 A CN 1783745A
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Abstract
This invention discloses a down power control method when a radio communication system with a base station begins to establish radio links including: A, after the radio communication system sets up Iub interface connection, the base station begins to emit a down special channel code with an initial power and carries out step B after some time, B, the base station climbs the emission power of the down special channel code and emits the down special channel code with the climbed emission power, C, the base station judges if it reaches to the up synchronization after receiving signals from the user device, if so, it stops climbing the down special channel emission power and begins the normal inner loop power control, otherwise, it returns to step B.
Description
Technical field
The present invention relates to the power control techniques in the wireless telecommunication system, relate in particular to the method for controlling downlink power of a kind of wireless telecommunication system when initially setting up Radio Link.
Background technology
Current, universal mobile telecommunications system (UTMS, Universal Mobile TelecommunicationsSystem) land radio access web (UTRAN, UTMS Territorial Radio Access Network) is widely used, comprise radio network controller (RNC, Radio NetworkController) and base station (Node B) among the UTRAN.The UTRAN that Fig. 1 announces for 3GPP TS25.214 initially sets up the physical layer procedure figure of Radio Link (RL), abbreviate the above-mentioned process of initially setting up Radio Link as initial link setup process in this article, initial link setup process is included in Radio Resource control (RRC) and connects among the process of setting up and in the direct-cut operation, this paper has mainly described RRC and has connected the initial link setup process of setting up in the process, the process of setting up of new link is identical with it in the direct-cut operation, no longer is repeated in this description.Referring to Fig. 1, at t
1Constantly, the RRC connection request arrives RNC; At t
2Radio Link is set up in RNC decision constantly, begins initial link setup, sends the request of Radio Link link setup to Node B; At T
2During this time, finish the foundation of Iub interface establishment of connection and user plane bearer, comprising the synchronizing process of finishing Iub interface between RNC and the Node B, after Iub interface is set up successfully, Node B begins transmitting downstream dedicated channel sign indicating number, and RNC sends RRC by NodeB to UE and connects and set up message; Node B is at t
3Constantly receive the RRC connection and set up message, and by secondary Common Control Physical Channel (S-CCPCH, Secondary Common Control Physical Channel) message is set up in the RRC connection and transmitted to subscriber equipment (UE, User Equipment); UE is at t
4Constantly receive that RRC connects and set up message that it is synchronous to begin to carry out downlink dedicated physical control channel (DPCCH), i.e. down-going synchronous; After UE obtains down-going synchronous at t
5Constantly send the uplink power control prefix signal to Node B, the length of this prefix signal is specified by network layer, and it is synchronous that Node B sets up special physical controlling channel of upward during this period, i.e. uplink synchronous, and after the uplink synchronous, initial link setup finishes; After the prefix signal ended at t
6UE begins to send up dedicated physical channel (DPCH) signal to Node B constantly, and comprising the RRC connection setup complete message, NodeB transmits this RRC connection setup complete message to RNC again, at t
7RNC receives this message constantly, finishes whole RRC and connects the process of setting up.
Fig. 2 connects the signaling process figure that sets up for the RRC that 3GPP TS25.214 announces.Referring to Fig. 2, this signaling process is by the Iub standard interface signaling process between Node B and the RNC, and the Uu standard interface signaling process between UE and the UTRAN is formed.The process that the RRC connection is set up and initially the process of link setup mainly comprises following dual serial:
First process: the signaling procedure and the user plane bearer of the Node B application protocol (NBAP) of Iub interface are set up process, comprising:
Step 1, UE send the RRC connection request to RNC, at described t
1This RRC connection request arrives RNC constantly.
Step 2, at described t
2RNC distributes RNT1 and L1/L2 resource according to the RRC connection request constantly, and sends Radio Link foundation request to Node B, and request Node B distributes RRC to connect required specific radio link resource, is wireless link distribution up-downgoing dedicated channel.
Step 3, Node B reply Radio Link to RNC and set up response after air-link resources is prepared successfully, inform that with this RNC can carry out initial link setup.
Following steps 4 to step 5 is an Iub interface establishment of connection process:
Step 4, use ALCAP agreement are initiated the foundation of Iub interface user face transmission bearer.
Step 5, utilize dedicated channel-Frame Protocol to finish the down-going synchronous process of Iub interface between Node B and the RNC.
Step 6, utilize dedicated channel-Frame Protocol to finish the uplink synchronous process of Iub interface between Node B and the RNC, after the Iub interface uplink synchronous, the success of Iub interface establishment of connection, Node B begins to send the downlink dedicated channels sign indicating number with initial power to UE.
After above-mentioned Iub interface signaling procedure is finished, just start following second process.
Second process: the RRC signaling procedure and the user plane bearer of Uu interface are set up process, comprising:
Step 7, RNC send the RRC connection and set up message, by Node B this RRC are connected and set up forwards to UE, and UE is at t
4Constantly arrive RRC.
With shown in Figure 1 corresponding, at above-mentioned steps 7 described t
4Constantly, UE begins to carry out down-going synchronous; After the down-going synchronous, at t
5Send upward signal to Node B constantly, carry out uplink synchronous by Node B, after the uplink synchronous, described initial link setup finishes.
Step 8, Node B send the wireless link recovery request to RNC, inform that the initial link setup of RNC finishes.
Step 9, UE send the RRC connection setup complete message, give RNC by Node B with this forwards.
Following table 1 is a power control detail list in the initial link setup process of UTRAN:
| Link setup | Uplink power control | Downlink power control | |
| Interior ring | Network side | Node B is after Iub interface connects foundation, and transmitting power control (TPC) sequence according to the RNC appointment before the uplink synchronous sends TPC order carrying out uplink power control; Signal interference ratio (SIR) and target signal interference ratio (SIRTarget) according to received signal after the uplink synchronous send up TPC order, carry out uplink power control | Node B kept Initial Trans constant before Iub interface connects foundation back, uplink synchronous; After uplink synchronous, according to TPC order the carrying out downlink power control of UE transmission |
| The UE side | Begin to send up DPCCH signal after the UE down-going synchronous, and the TPC that sends according to Node B carries out uplink power control | Begin to send up DPCCH signal after the UE down-going synchronous, SIR and SIRTarget according to received signal send descending TPC order, carry out downlink power control | |
| Outer shroud | Network side | No outer shroud | Do not relate to |
| The UE side | Relate to | No outer shroud | |
Table 1
Referring to table 1, when above-mentioned initial link setup, there is not initial exterior ring power control, have only initial inner loop power control, the purpose of initial inner loop power control is the error that remedies the initial open loop power control, makes the up-downgoing dedicated link synchronous as early as possible.In the scheme that the TS25.214 agreement that 3GPP has announced is proposed, initial inner loop power control mainly is divided into two kinds of situations of uplink and downlink, wherein:
Up inner loop power control procedure is: Node B is after Iub interface connects foundation, before the uplink synchronous always according to transmitting power control mode (TPC Pattern, Transmit Power Control Pattern) sends up TPC order, promptly the TPC sequence with the RNC appointment sends up TPC order, carries out uplink power control; UE just begins to send up DPCCH signal after down-going synchronous, and up TPC order the carrying out uplink power control that sends according to Node B.
Descending inner loop power control procedure is: Node B is after Iub interface connects foundation, beginning transmitting downstream dedicated channel sign indicating number, before Node B uplink synchronous, always with the power emission downlink dedicated channels sign indicating number of initial configuration, and resolve the up DPCCH signal of receiving, judge whether to obtain uplink synchronous according to the analysis result correctness; After uplink synchronous, Node B resolves and receives effective descending TPC command word, just begins to carry out normal power control according to descending TPC command word and adjusts.
Above-mentioned prior art shows that in the process of initial link setup, Node B is before obtaining uplink synchronous, and its downlink dedicated channels sign indicating number transmitting power remains constant, launches with initial power all the time.In such cases, in case that initial downlink dedicated channel sign indicating number transmitting power is provided with is on the low side, then may cause following point:
1, because the Initial Trans of downlink dedicated channels sign indicating number is to connect according to RRC to set up the pilot signal quality (EcNo) that reports in the request message and determine, and the EcNo of pilot tone changes, when UE began down-going synchronous, the EcNo of pilot tone changed.For example: UE is at the local preferably RRC connection request of initiating of cell signal, and this moment, the EcNo of pilot tone was higher, and the initial downlink sign indicating number transmitting power of the downlink dedicated channels sign indicating number of Que Dinging is lower according to this; When UE begins down-going synchronous, UE moves to the relatively poor place of EcNo of pilot tone, as entered the deep fade district, this moment, described lower initial downlink sign indicating number transmitting power can further cause being lower than required value in the bit energy and the noise energy of this section receiving terminal in the time than (Eb/No), there is not this moment corresponding adjustment mechanism to heighten initial downlink sign indicating number transmitting power again, therefore can cause relatively difficulty of down-going synchronous process, even make initial link setup failure because of down-going synchronous is overtime.
2, cause down-going synchronous to be made slow progress, the time is long partially, can make professional setup delay become big, influences service quality.
Summary of the invention
The method for controlling downlink power that main purpose of the present invention provides a kind of wireless telecommunication system when initially setting up Radio Link prevents to cause initial link setup failure because of down-going synchronous is overtime, shortens the time of down-going synchronous.
Method for controlling downlink power when a kind of wireless telecommunication system is initially set up Radio Link, this wireless telecommunication system comprises the base station, this method comprises:
A, after wireless telecommunication system is set up Iub interface and is connected, the base station begins with initial power transmitting downstream dedicated channel sign indicating number, and behind a fixed response time, execution in step B;
The transmitting power of B, the soaring downlink dedicated channels sign indicating number in base station, and with the transmitting power transmitting downstream dedicated channel sign indicating number after soaring;
C, behind the signal that receives from subscriber equipment, the base station judges whether to reach uplink synchronous, if stop soaring downlink dedicated channels sign indicating number transmitting power; Otherwise, return step B.
As a preferred embodiment of the present invention, in the steps A, described certain time delay is zero.
As another preferred version of the present invention, the method for the transmitting power of soaring downlink dedicated channels sign indicating number is among the described step B: soaring fixing power magnitude in the fixed cycle.
As another preferred version of the present invention, the method for the transmitting power of soaring downlink dedicated channels sign indicating number is among the described step B:
Base station self circulation generates the steadily soaring continuous down transmitting power control TPC order of may command transmitting power, and with this continuous descending TPC order control downlink dedicated channels sign indicating number transmitting power.
The method of the continuous descending TPC order of described generation is: alternately generate the descending TPC order of reduction power and the descending TPC order of rising power continuously, the TPC of at least one rising power of regeneration order afterwards.
As another preferred version of the present invention, among the step C, described base station judges whether that the method that reaches uplink synchronous is: can the base station is judged correctly resolve the signal from subscriber equipment that receives, if can correctly resolve, then judges to reach uplink synchronous; Otherwise, judge not reach uplink synchronous.
As another preferred version of the present invention, among the step C, after the base station reaches uplink synchronous, further comprise: the base station is according to the descending TPC order control downlink dedicated channels sign indicating number transmitting power from subscriber equipment.
In described step B, further comprise:
Whether real-time judge downlink dedicated channels sign indicating number transmitting power reaches predetermined maximum downstream dedicated channel sign indicating number transmitting power, if then keep this maximum downstream dedicated channel sign indicating number transmitting power; Otherwise, carry out the step that continues soaring descending sign indicating number transmitting power.
Described wireless telecommunication system is the universal mobile telecommunications system land radio access web.
Because the method for the invention is before the uplink synchronous of base station, downlink dedicated channels sign indicating number transmitting power is risen by certain rule, thereby prevented under some occasion, after for example UE enters the deep fade district, because of Synchronization timeout causes initial link setup failure, improved the success rate of initial link setup; And,, therefore shortened the lock in time of downlink dedicated channels, and further shortened professional setup delay, thereby improved service quality because soaring downlink dedicated channels sign indicating number transmitting power makes subscriber equipment resolve successful downlink dedicated channels sign indicating number quickly.
Description of drawings
Fig. 1 is the physical layer sequential chart of the initial link setup of UTRAN in the prior art;
Fig. 2 is the signaling process figure of the initial link setup of UTRAN in the prior art;
Fig. 3 is the flow chart of the method for the invention.
Embodiment
Further specify implementation method of the present invention below in conjunction with the drawings and specific embodiments.
Core concept of the present invention is: during initial link setup, Node B before obtaining uplink synchronous, the transmitting power of soaring downlink dedicated channels sign indicating number.
The present invention is applicable to the synchronizing process A described in the 4.3.2.1 of agreement TS25.214, promptly the initial link setup of UTRAN synchronously.In the flow process of the initial link setup of UTRAN, begin transmitting downstream dedicated channel sign indicating number transmitting power from NodeB, to t
4Constantly UE receive RRC Connection Setup message during this period of time in, because UE does not also begin the down-going synchronous process, therefore during this period of time the size of downlink dedicated channels sign indicating number transmitting power to initial link setup without any influence, therefore NodeB still can keep Initial Trans constant by existing TS25.214 agreement regulation.
When UE at t
4After constantly receiving RRC Connection Setup message, the initial synchronisation of beginning downlink dedicated channels.Therefore, should begin soaring downlink dedicated channels sign indicating number transmitting power at this moment, so that UE can finish the downlink dedicated channels synchronizing process rapidly.
By above-mentioned analysis, the present invention can determine t
4For beginning the best time of soaring downlink dedicated channels sign indicating number transmitting power.
In the present embodiment, owing to begin transmitting downstream dedicated channel sign indicating number to t from NodeB
4Constantly very short during this period of time, in general have only a few tens of milliseconds, so can ignore, therefore, in the present embodiment, NodeB can just carry out power ramp in the moment of initial transmissions downlink dedicated channels sign indicating number.Facts have proved, begin power ramp from moment of NodeB initial transmissions downlink dedicated channels sign indicating number and can reach equally from t
4Constantly begin the effect of power ramp.
Fig. 3 is the flow chart of the embodiment of the invention.Referring to Fig. 3, present embodiment comprises:
After step 32, the success of Iub interface establishment of connection, Node B begins with predefined initial power transmitting downstream dedicated channel sign indicating number, and in the moment of initialization downlink dedicated channels sign indicating number, promptly execution in step 33.
The transmitting power of step 33, the soaring downlink dedicated channels sign indicating number of Node B.
Can step 34, Node B judge the up DPCCH signal that correctly resolve from UE, promptly reach uplink synchronous, if can, then execution in step 35; Otherwise, return step 33.
The present invention can adopt the several different methods downlink dedicated channels sign indicating number transmitting power that rises, and in the present embodiment, can adopt following two kinds of methods respectively:
Method one: soaring constant power amplitude (Pdelt) in the fixed cycle (T).Soaring cycle and power magnitude can be provided with flexibly according to the signal situation of change of reality.For example, T=40ms can be set, Pdelt=0.5dB.
Method two: Node B circulates voluntarily and generates N continuous value is (" 0 ", " 1 ") after connect of the descending TPC order of a value for " 1 ", and with this descending TPC order control downlink dedicated channels sign indicating number transmitting power, herein, value is turned down the transmitting power of certain power control step-length for the descending TPC order expression of " 0 ", value is heightened the transmitting power of certain power control step-length for the descending TPC order expression of " 1 ", a N continuous value is that the descending TPC command word of (" 0 ", " 1 ") is illustrated in that average transmit power remains unchanged in this section period; A N continuous value is after connecing at least one value after (" 0 ", " 1 ") and keeping a period of time transmitting power constant for the descending TPC command list of " 1 " is shown in, and heightens the transmitting power of at least one power control step-length, with soaring transmitting power reposefully.N is the natural number that sets in advance, and N and power ramp step-length can be provided with flexibly according to the signal situation of change of reality.For example, N=15 can be set, the power ramp step-length can be set to 0.5,1,1.5 or 2dB on demand.
The method of the adoptable soaring descending sign indicating number transmitting power of the present invention is not only limited to above two kinds, and those skilled in the art are according to said method, and the method for the soaring descending yard transmitting power that obtains by simple transformation is all at row of the present invention.
In addition, in the present embodiment, the transmitting power of Node B downlink dedicated channels sign indicating number is subjected to the restriction of the predefined maximum downstream sign indicating number of RNC transmitting power, and this maximum downstream sign indicating number transmitting power is transferred to Node B in advance by RNC, therefore above-mentioned carry out power ramp in, further comprise:
Judge whether downlink dedicated channels sign indicating number transmitting power reaches predetermined maximum downstream dedicated channel sign indicating number transmitting power, if, then keep this maximum downstream dedicated channel sign indicating number transmitting power, reach uplink synchronous up to Node B, again by the transmitting power of controlling the downlink dedicated channels sign indicating number from the descending TPC order of UE; Otherwise continue soaring downlink dedicated channels sign indicating number transmitting power.
In the foregoing description, Node B is just soaring immediately downlink dedicated channels sign indicating number transmitting power when initialization downlink dedicated channels sign indicating number.Method of the present invention also can be after one section time delay of Node B initialization downlink dedicated channels sign indicating number, the power of the downlink dedicated channels sign indicating number that rises again.This section time delay generally is a few tens of milliseconds, can control this time delay with timer, regularly triggers the power of the soaring downlink dedicated channels sign indicating number of Node B.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and 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.
Claims (9)
- Method for controlling downlink power when 1, a kind of wireless telecommunication system is initially set up Radio Link, this wireless telecommunication system comprises the base station, this method comprises:A, after wireless telecommunication system is set up Iub interface and is connected, the base station begins with initial power transmitting downstream dedicated channel sign indicating number, and behind a fixed response time, execution in step B;The transmitting power of B, the soaring downlink dedicated channels sign indicating number in base station, and with the transmitting power transmitting downstream dedicated channel sign indicating number after soaring;C, behind the signal that receives from subscriber equipment, the base station judges whether to reach uplink synchronous, if stop soaring downlink dedicated channels sign indicating number transmitting power; Otherwise, return step B.
- 2, the method for claim 1 is characterized in that, in the steps A, described certain time delay is zero.
- 3, the method for claim 1 is characterized in that, the method for the transmitting power of soaring downlink dedicated channels sign indicating number is among the described step B: soaring fixing power magnitude in the fixed cycle.
- 4, the method for claim 1 is characterized in that, the method for the transmitting power of soaring downlink dedicated channels sign indicating number is among the described step B:Base station self circulation generates the steadily soaring continuous down transmitting power control TPC order of may command transmitting power, and with this continuous descending TPC order control downlink dedicated channels sign indicating number transmitting power.
- 5, method as claimed in claim 4, it is characterized in that, the method of the continuous descending TPC order of described generation is: alternately generate the descending TPC order of reduction power and the descending TPC order of rising power continuously, the TPC of at least one rising power of regeneration order afterwards.
- 6, the method for claim 1, it is characterized in that among the step C, described base station judges whether that the method that reaches uplink synchronous is: can the base station is judged correctly resolve the signal from subscriber equipment that receives, if can correctly resolve, then judge to reach uplink synchronous; Otherwise, judge not reach uplink synchronous.
- 7, the method for claim 1 is characterized in that, among the step C, after the base station reaches uplink synchronous, further comprises: the base station is according to the descending TPC order control downlink dedicated channels sign indicating number transmitting power from subscriber equipment.
- 8, as each described method of claim 1 to 7, it is characterized in that, in described step B, further comprise:Whether real-time judge downlink dedicated channels sign indicating number transmitting power reaches predetermined maximum downstream dedicated channel sign indicating number transmitting power, if then keep this maximum downstream dedicated channel sign indicating number transmitting power; Otherwise, carry out the step that continues soaring descending sign indicating number transmitting power.
- As each described method of claim 1 to 7, it is characterized in that 9, described wireless telecommunication system is the universal mobile telecommunications system land radio access web.
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| CNB2004100965665A CN100382456C (en) | 2004-12-03 | 2004-12-03 | Down line power control method for radio communication system while initial establishing radio link |
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| CNB2004100965665A CN100382456C (en) | 2004-12-03 | 2004-12-03 | Down line power control method for radio communication system while initial establishing radio link |
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| CN1783745A true CN1783745A (en) | 2006-06-07 |
| CN100382456C CN100382456C (en) | 2008-04-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431350B (en) * | 2007-11-09 | 2012-07-18 | 中兴通讯股份有限公司 | Downlink power control method |
| CN101321373B (en) * | 2007-06-07 | 2012-10-03 | 华为技术有限公司 | Measurement reporting and load control method and device for minimum channel code requirement |
| CN104994570A (en) * | 2015-06-30 | 2015-10-21 | 上海华为技术有限公司 | Open loop power control method and device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100419409B1 (en) * | 2000-06-24 | 2004-02-19 | 삼성전자주식회사 | Apparatus and method for synchronization of uplink synchronous transmission scheme in cdma communication system |
| EP1232585A4 (en) * | 2000-10-04 | 2006-11-29 | Samsung Electronics Co Ltd | Apparatus and method for power control of downlink shared channel in mobile communication system |
| CN1232057C (en) * | 2001-07-04 | 2005-12-14 | 中兴通讯股份有限公司 | Method based on packet exchange service for setting up downlink emitting power |
| CN1166096C (en) * | 2001-07-18 | 2004-09-08 | 华为技术有限公司 | Method for synchronizing special physical channels in WCDMA access system |
| KR100811043B1 (en) * | 2001-11-16 | 2008-03-06 | 엘지전자 주식회사 | method for controlling transmission power of SCH and HI in mobile communication |
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2004
- 2004-12-03 CN CNB2004100965665A patent/CN100382456C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101321373B (en) * | 2007-06-07 | 2012-10-03 | 华为技术有限公司 | Measurement reporting and load control method and device for minimum channel code requirement |
| CN101431350B (en) * | 2007-11-09 | 2012-07-18 | 中兴通讯股份有限公司 | Downlink power control method |
| CN104994570A (en) * | 2015-06-30 | 2015-10-21 | 上海华为技术有限公司 | Open loop power control method and device |
| WO2017000665A1 (en) * | 2015-06-30 | 2017-01-05 | 华为技术有限公司 | Open loop power control method and apparatus |
| CN104994570B (en) * | 2015-06-30 | 2018-11-20 | 上海华为技术有限公司 | A kind of open-loop power control method and device |
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| CN100382456C (en) | 2008-04-16 |
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