CN100407591C - Power control method for wireless communication system - Google Patents
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Abstract
The present invention discloses a power control method in a wireless communication system. During the uplink discontinuous transmission of the wireless communication system, a power control step length adjusting parameter which is greater than or equal to zero is obtained according to an SBGP parameter, and a conventional power control step length plus the power control step length adjusting parameter serves as a new power control step length so as to control downlink power. Under the condition that special signaling support is not needed in the process of communication, the power control method in the wireless communication system of the present invention optimizes the downlink power control step length during the uplink discontinuous transmission through the power control step length added according to the value of SBGP during the discontinuous transmission, achieves the effects of respective optimization in view of different SBGP, enhances the power control effect in the wireless communication system during the uplink discontinuous transmission, and ensures that when the system is in a non-discontinuous transmitting state, the power control is not influenced.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the Poewr control method in up discontinuous when emission in a kind of wireless communication system.
Background technology
The closed power control technology is widely used in UTRA (Universal Telecommunication RadioAccess) FDD and UTRA (Universal Telecommunication Radio Access) TDD3.84/1.28Mcps system, in the closed power controlling mechanism, subscriber equipment/base station is according to periodically adjusting transmitting power from the entrained power control command of the based on feedback link of base station/user equipment.
With the downlink power control is example, and subscriber equipment receives from after the signal of base station, and whether decision needs to increase or reduce the transmitting power of base station signal, and produces power control command.Subscriber equipment passes to the base station with power control command by up feedback channel, and transmitting power is adjusted after receiving power control command in the base station.
Only comprising the requirement transmitting power in the power control command in the conventional power control techniques is the information that increases or reduce, and the concrete numerical value of the transmitting power that increases and reduce is determined by base station and subscriber equipment as offered, is referred to as the power control step-length.For UTRA TDD system, the power control step-length may be 1dB, 2dB, 3dB, determines when Radio Link is set up.
For UTRA TDD system, when if the high level of base station or subscriber equipment does not have data to offer coded combination transmission channel (CCTrCH) in Transmission Time Interval (TTI), base station and subscriber equipment can be that unit implements discontinuous emission (DTX) with coded combination transmission channel (CCTrCH).When discontinuous emission (DTX) acts on certain CCTrCH, this CCTrCH stops conventional data transmission, change into certain cycle emission special burst (SB, Special Bursts), the up SB emission cycle is called SBGP (Special Burst Generation Period), the descending SB emission cycle is called SBSP (Special Burst Scheduling Period), wherein the desirable value of SBGP is 2,4,8,16,32,64,128,256, is indicated to subscriber equipment by signaling message by Radio Resource control (RRC) entity of base station side.The enforcement of discontinuous emission eats dishes without rice or wine to disturb, save equipment energy consumption to minimizing and implement between the frequency of wireless system/and switch between system positive role is arranged.
For UTRA TDD 3.84/1.28Mcps system, when discontinuous emission acts on up CCTrCH, exert an influence for downlink closed-loop power control meeting, at this moment up CCTrCH is as feedback channel, and corresponding downstream CCTrCH is as the Be Controlled channel.Because up CCTrCH is in discontinuous emitting state, in up discontinuous when emission,, the base station can only be with the cycle reception SB of SBGP radio frames, and the descending power control command that acquisition is carried by SB from SB, such effect just makes that downlink closed-loop power control frequency is slack-off, causes the power control deleterious.When the 1.28Mcps system that same problem also occurs in UTRA TDD is in descending discontinuous emission.
Consider the restricting relation of the frequency and the step-length of closed-loop power control,, should suitably improve the power control step-length of downlink power control during the up discontinuous emission in order to reduce the slack-off power control decreased performance that causes of closed-loop power control frequency.Owing to only comprise the requirement transmitting power in the power control command is the information that increases or reduce, can't carry the information of how the power control step-length being adjusted, so in traditional wireless communication system, can only use same power control step-length during the system convention emission with during the discontinuous emission, can't satisfy the power control step-length during routine emission and all reach the requirement of optimization during the discontinuous emission, the feasible power control performance of the wireless system of discontinuous emission of supporting produces performance loss when discontinuous emission, influence the power control effect.
Summary of the invention
The object of the present invention is to provide the Poewr control method in a kind of wireless communication system, using different power control step-lengths during the system convention emission with during the discontinuous emission, the power control usefulness of raising system during discontinuous emission reduces performance loss.
To achieve these goals, the invention provides the Poewr control method in a kind of wireless communication system, wherein, during the discontinuous emission of system uplink, adjust parameter according to SBGP parameter acquiring one more than or equal to 0 power control step-length, and conventional power control step-length is added the above power control step-length adjust parameter as new power control step-length, descending power is controlled.
Poewr control method in the above-mentioned wireless communication system, wherein, along with the increase of described SBGP value, described power control step-length is adjusted parameter constant or increase.
Poewr control method in the above-mentioned wireless communication system, wherein, described SBGP parameter equals 32 or at 64 o'clock, and described power control step-length is adjusted parameter more than or equal to 0dB, and smaller or equal to 4dB;
Described SBGP parameter equals 2,4,8 or at 16 o'clock, and described power control step-length is adjusted parameter more than or equal to 0dB, and smaller or equal to 4dB;
Described SBGP parameter equals 128 or at 256 o'clock, and described power control step-length is adjusted parameter more than or equal to 0dB, smaller or equal to 8dB.
Poewr control method in the above-mentioned wireless communication system, wherein, described power control step-length is adjusted parameter and is done to multiply by after the computing one by described SBGP parameter and adjust coefficient and obtain.
Poewr control method in the above-mentioned wireless communication system, wherein, described power control step-length adjust parameter equal described SBGP parameter get 2 for behind the logarithm at the end with the product of adjusting coefficient, described adjustment coefficient is more than or equal to 0 and smaller or equal to 1.
Poewr control method in the above-mentioned wireless communication system wherein, specifically comprises the steps:
Step 4, the base station judges by whether producing transfer of data again according to this up CCTrCH whether this CCTrCH has withdrawed from discontinuous emitting state, if not, then execution in step 3, otherwise return step 1.
Poewr control method in the above-mentioned wireless communication system wherein, specifically comprises the steps:
Step 1 ', to the CCTrCH under the conventional emission state, subscriber equipment uses conventional power control step-length in the descending power control command;
Step 2 ', subscriber equipment judges whether certain up CCTrCH has entered up discontinuous emitting state, if not, returns execution in step 1 ', otherwise execution in step 3 ';
Step 3 ', subscriber equipment adds the above power control step-length with conventional power control step-length and adjusts parameter as new power control step-length, uses described new power control step-length in the descending power control command;
Step 4 ', whether subscriber equipment produces transfer of data again and judges whether this CCTrCH has withdrawed from discontinuous emitting state according to this up CCTrCH, if not, execution in step 3 ' then, otherwise return step 1 '.
Poewr control method in the wireless communication system of the present invention, in communication process, under the situation that need not special signaling support, power control step-length when increasing discontinuous emission by value according to SBGP, not only when up discontinuous emission, optimized the downlink power control step-length, and having reached optimization effect respectively at different SBGP, the power control when the power control effect when having strengthened up discontinuous emission in the wireless communication system, the system that guarantees simultaneously are in non-discontinuous emitting state is unaffected.
Description of drawings
Fig. 1 is the flow chart of the Poewr control method in the wireless communication system of the present invention.
Embodiment
Poewr control method in the wireless communication system of the present invention is used for UTRA TDD system, carries out power control when up discontinuous emission.
In UTRA TDD system, the SBGP of up discontinuous emission is indicated to subscriber equipment by signaling message by Radio Resource control (RRC) entity of base station side, system is when the up discontinuous emission, and base station side and user equipment side all are to know the SBGP parameter of up discontinuous emission.
Poewr control method in the wireless communication system of the present invention the time utilizes the SBGP parameter to optimize the power control step-length of descending power control in up discontinuous emission, suitably improve according to the value of SBGP power control step-length in up discontinuous when emission routine, reach value difference optimization effect to each SBGP, strengthening the power control effect in up discontinuous when emission, the power control the when system that guarantees simultaneously is in non-discontinuous emitting state is unaffected.
First embodiment of the Poewr control method in the wireless communication system of the present invention carries out in base station side, as shown in Figure 1, comprises the steps:
Step 4, the base station judges by whether produce transfer of data again according to this CCTrCH whether this CCTrCH has withdrawed from discontinuous emitting state, if not, then execution in step 3, otherwise return step 1.
Poewr control method in the wireless communication system of the present invention is implemented respectively by the CCTrCH of base station to each activation in the system.
Second embodiment of the Poewr control method in the wireless communication system of the present invention carries out at the subscriber equipment end, comprises the steps:
Step 1 ', to the CCTrCH under the conventional emission state, subscriber equipment uses the first power control step-length K in the descending power control command, and this first power control step-length K is the power control step-length under the conventional emission state;
Step 2 ', subscriber equipment judges whether certain up CCTrCH has entered up discontinuous emitting state, if not, returns execution in step 1 ', otherwise execution in step 3 ';
Step 3 ', subscriber equipment adds a suitable increment T as the second power control step-length K ' (K+T) according to the value of SBGP with the first power control step-length K, uses the second power control step-length K ' in the descending power control command;
Step 4 ', whether subscriber equipment produces transfer of data again according to this CCTrCH is judged whether this CCTrCH has withdrawed from discontinuous emitting state, if not, execution in step 3 ' then, otherwise return step 1 '.
In step 3 or 3 ', value according to SBGP adds a suitable increment T to the first power control step-length K, and the present invention proposes the computational methods of two kinds of increment T: utilize look-up table to obtain T or usage factor method according to the value of SBGP and SBGP is done computing and multiply by a certain coefficient and obtain T.
If utilize look-up table to calculate increment T, the correspondence table of storing a SBGP value and increment T in advance in base station side is according to the table look-up value of acquisition increment T of the value of SBGP.Consider the restricting relation of the frequency and the step-length of closed-loop power control, wherein, in the correspondence table of SBGP value and increment T, the corresponding relation of SBGP value and increment T is the increase along with the SBGP value, increment T is the non-relation that subtracts, and following table is depicted as the correspondence table of SBGP value of the present invention and increment T.
| The SBGP scope | |
| 2、4、8、16 | More than or equal to 0dB, smaller or equal to 4dB |
| 32、64 | More than or equal to 0dB, smaller or equal to 5dB |
| 128、256 | More than or equal to 1dB, smaller or equal to 8dB |
If the usage factor method is done computing and be multiply by a certain coefficient when obtaining T SBGP, is that example describes with UTRATDD 1.28Mcps pattern.
T=log
2(numerical value of SBGP) * C
Following table is the value form of coefficient C among the present invention.
| The numerical value of SBGP | With 2 is the logarithm value of the SBGP at the end | The scope of |
| 2、4、8、16、32、64、128、256 | 1、2、3、4、5、6、7、8 | 0≤C≤1 |
Poewr control method in the wireless communication system of the present invention also can use at the subscriber equipment end, itself and base station end use same SBGP value and the correspondence table (look-up table) of increment T and same Y-factor method Y computing formula (Y-factor method Y), subscriber equipment during up discontinuous emission according to method 1) or method 2) the power control step-length revised, use revised power control step-length to substitute the downlink closed-loop power control commands decision algorithm of the power control step-length participating user equipment side under the non-discontinuous emitting state.
Method of the present invention has been optimized the downlink power control step-length respectively according to SBGP when up discontinuous emission, power control when the power control effect when having strengthened up discontinuous emission in the wireless communication system, the system that guarantees simultaneously are in non-discontinuous emitting state is unaffected.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1. the Poewr control method in the wireless communication system, it is characterized in that, during the up discontinuous emission of wireless communication system, obtain one according to the up special burst emission cycle and adjust parameter more than or equal to 0 power control step-length, and conventional power control step-length is added the above power control step-length adjust parameter as new power control step-length, descending power is controlled.
2. the Poewr control method in the wireless communication system according to claim 1 is characterized in that, along with the increase in described up special burst emission cycle, described power control step-length is adjusted parameter constant or increase.
3. the Poewr control method in the wireless communication system according to claim 2 is characterized in that: the described up special burst emission cycle equals 32 or at 64 o'clock, and described power control step-length is adjusted parameter more than or equal to 0dB, and smaller or equal to 4dB;
The described up special burst emission cycle equals 2,4,8 or at 16 o'clock, and described power control step-length is adjusted parameter more than or equal to 0dB, and smaller or equal to 4dB;
The described up special burst emission cycle equals 128 or at 256 o'clock, and described power control step-length is adjusted parameter more than or equal to 0dB, smaller or equal to 8dB.
4. the Poewr control method in the wireless communication system according to claim 1 is characterized in that, described power control step-length is adjusted parameter and done to multiply by after the computing one by the described up special burst emission cycle and adjust coefficient and obtain.
5. the Poewr control method in the wireless communication system according to claim 4, it is characterized in that, described power control step-length adjust parameter equal the described up special burst emission cycle get 2 for behind the logarithm at the end with the product of adjusting coefficient, described adjustment coefficient is more than or equal to 0 and smaller or equal to 1.
6. according to the Poewr control method in claim 1,2,3, the 4 or 5 described wireless communication systems, it is characterized in that, specifically comprise the steps:
Step 1, to the coded combination transmission channel under the conventional emission state, the base station uses conventional power control step-length to carry out downlink power control;
Step 2, base station are by judging to the reception of special burst whether certain up coded combination transmission channel has entered discontinuous emitting state, if not, returns execution in step 1, otherwise execution in step 3;
Step 3, base station add the above power control step-length adjustment parameter with conventional power control step-length and control carried out power by power control downlink coding combination of transmitted channel as new power control step-length;
Step 4, the base station judges by whether producing transfer of data again according to this up coded combination transmission channel whether this up coded combination transmission channel has withdrawed from discontinuous emitting state, and if not, then execution in step 3, otherwise return step 1.
7. according to the Poewr control method in claim 1,2,3, the 4 or 5 described wireless communication systems, it is characterized in that, specifically comprise the steps:
Step 1 ', to the coded combination transmission channel under the conventional emission state, subscriber equipment uses conventional power control step-length in the descending power control command;
Step 2 ', subscriber equipment judges whether certain up coded combination transmission channel has entered up discontinuous emitting state, if not, returns execution in step 1 ', otherwise execution in step 3 ';
Step 3 ', subscriber equipment adds the above power control step-length with conventional power control step-length and adjusts parameter as new power control step-length, uses described new power control step-length in the descending power control command;
Step 4 ', whether subscriber equipment produces transfer of data again and judges whether this up coded combination transmission channel has withdrawed from discontinuous emitting state according to this up coded combination transmission channel, if not, execution in step 3 ' then, otherwise return step 1 '.
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| CN102196547B (en) * | 2010-03-05 | 2014-03-26 | 中国移动通信集团公司 | Special burst transmission method for time division-synchronous code division multiple access (TD-SCDMA) system |
| CN102076075B (en) | 2010-12-23 | 2014-03-19 | 意法·爱立信半导体（北京）有限公司 | Method, device and system for controlling data transmission power of opposite end |
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| US20050124373A1 (en) * | 2003-11-21 | 2005-06-09 | Interdigital Technology Corporation | Wireless communication method and apparatus for controlling the transmission power of downlink and uplink coded composite transport channels based on discontinuous transmission state values |
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| CN1266562A (en) * | 1998-04-25 | 2000-09-13 | 三星电子株式会社 | Power level arbitration between base station and mobile station in mobile communication system |
| CN1270453A (en) * | 1999-04-12 | 2000-10-18 | 阿尔卡塔尔公司 | Method for improving mobile radio communication sysetm by power controlling algorithms |
| EP1089456A2 (en) * | 1999-09-29 | 2001-04-04 | Nortel Networks Limited | Outer loop power control in discontinuous transmission mode |
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