CN100546214C - A kind of method of terminal being carried out open loop power control - Google Patents
A kind of method of terminal being carried out open loop power control Download PDFInfo
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- CN100546214C CN100546214C CNB2006100005814A CN200610000581A CN100546214C CN 100546214 C CN100546214 C CN 100546214C CN B2006100005814 A CNB2006100005814 A CN B2006100005814A CN 200610000581 A CN200610000581 A CN 200610000581A CN 100546214 C CN100546214 C CN 100546214C
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- uplink interference
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Abstract
The invention discloses and a kind of terminal is carried out the method for open loop power control, this method comprises: correcting process is carried out to measured uplink interference power in the base station, and revised uplink interference power is sent to terminal; Terminal is according to the up-to-date initial prefix transmitting power of revised uplink interference power calculation that receives, and initial prefix transmitting power transmission access request of using this to calculate.The present invention can guarantee terminal calculate initial prefix transmitting power institute foundation uplink interference power value accurately and reliably, thereby guaranteed that network side carries out open loop power control accurately and reliably to terminal, improved the performance of terminal open loop power control, reduced interference to other user in the system, improve the capacity of system greatly, improved the QoS of system.
Description
Technical field
The present invention relates to code division multiple access (CDMA) technology, particularly relate to a kind of method of in cdma system, terminal being carried out open loop power control.
Background technology
In cdma system, open loop power control is meant when up link is not set up, and terminal employed initial prefix transmitting power when network side initiates to insert request is controlled.
Terminal being carried out open loop power control accurately and reliably, that is to say, guarantee that initial prefix transmitting power satisfies system requirements, is a key factor that improves the cdma system QoS.This is because if initial prefix transmitting power is excessive, just the transmitting power of terminal is too high, then can bring interference for other user in the system, reduces the capacity of system; If initial prefix transmitting power is too small, just the transmitting power of terminal is low excessively, then can cause the access request of system's refusal terminal, makes terminal to realize communication by connecting system.
Fig. 1 is prior art is carried out open loop power control to terminal a flow chart.Referring to Fig. 1, the process that prior art is carried out open loop power control to terminal specifically may further comprise the steps:
Step 101: Primary Common Pilot Channel transmitted power PCPICH_Tx_Power is broadcasted by system message 5 in the base station of network side on intercycle ground, sub-district.
Step 102: terminal receives this PCPICH_Tx_Power, and uses the up-to-date PCPICH_Tx_Power that receives to upgrade the PCPICH_Tx_Power that is preserved.
Step 103: the base station is by system message 5 broadcast terminal initial transmit power offsets amount Const_Value in the sub-district.
Step 104: terminal receives this Const_Value, and uses the up-to-date Const_Value that receives to upgrade the Const_Value that is preserved.
Step 105: the base station is the uplink interference power RTWP of measuring system periodically, and broadcasts the value of the RTWP that measures gained in the sub-district by system message 7.
Step 106: terminal receives this RTWP, and uses the up-to-date RTWP that receives to upgrade the RTWP that is preserved in self.
Step 107: terminal periodic measurement Primary Common Pilot Channel power CPICH_Rscp, and use the up-to-date CPICH_Rscp that measures to upgrade the CPICH_Rscp that is preserved.
Step 108: when terminal need connect with network side, terminal is brought up-to-date PCPICH_Tx_Power, CPICH_Rscp, RTWP and the Const_Value that is preserved in self among formula Preamble_Initial_Power=PCPICH_Tx_Power-CPICH_Rscp+RTWP+Const_Value into, calculates initial prefix transmitting power Preamble_Initial_Power.
Step 109: terminal initiates to insert request with the initial prefix transmitting power that is calculated to network side.
By above-mentioned flow process as can be seen, terminal is carried out open loop power control, promptly the size of the initial prefix transmitting power of control terminal mainly realizes by each parameters C PICH_Tx_Power, CPICH_Rscp, RTWP and Const_Value.That is to say, if terminal is carried out open loop power control accurately and reliably, improve the performance of terminal open loop power control, to realize the purpose of minimizing system self-interference, the value of employed each parameters C of the then necessary assurance initial prefix transmitting power of calculating PICH_Tx_Power, CPICH_Rscp, RTWP and Const_Value accurately and reliably.
In above-mentioned flow process, the value of parameters C PICH_Rscp is measured by terminal, and is not that network side determines, therefore, the accuracy of this parameters C PICH_Rscp value is guaranteed by terminal.And for the value of parameters C PICH_Tx_Power and Const_Value, be determined when cdma system disposes, rather than decide by the practical business environment, therefore, no matter in which kind of service environment, the value of calculating employed these two parameters C PICH_Tx_Power of initial prefix transmitting power and Const_Value all is a fixing value.And for parameters R TWP, it then not a fixing value, but decide by the service environment of reality, that is to say, the system uplink interference power RTWP in the practical business environment need be measured in the base station of network side, and terminal also must calculate initial prefix transmitting power according to the measured RTWP in base station.This shows, network side will be realized terminal is carried out open loop power control accurately and reliably, improve the performance of terminal open loop power control, then must guarantee base station measurement go out and send to terminal parameters R TWP value accurately and reliably, can reflect the uplink interference power of system in the practical business environment truly.
It can also be seen that from above-mentioned flow process shown in Figure 1 the base station of network side is not carried out any processing and just sent to terminal after measuring RTWP.Yet in the service environment of reality, network side bursty interference occurs through regular meeting, increases etc. such as some users' power is unusual.When bursty interference occurring, shake will appear in the value of the RTWP that the base station is measured, make that the value of RTWP is inaccurate, too high with respect to the uplink interference power of system in the practical business environment, can't reflect the uplink interference power of system in the practical business environment truly.Like this, terminal is also just correspondingly too high according to the initial prefix transmitting power that value calculated of this too high RTWP, thereby can't guarantee that network side carries out open loop power control accurately and reliably to terminal, reduced the performance of terminal open loop power control, and the interference that has caused for other user in the system, greatly reduce the capacity of system.
Summary of the invention
In view of this, main purpose of the present invention is to propose a kind of terminal to be carried out the method for open loop power control, to guarantee that network side carries out open loop power control accurately and reliably to terminal, improves the performance of terminal open loop power control.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of terminal is carried out the method for open loop power control, may further comprise the steps:
Correcting process is carried out to the uplink interference power of measuring in A, base station, and revised uplink interference power is sent to terminal;
B, terminal are according to the up-to-date initial prefix transmitting power of revised uplink interference power calculation that receives, and initial prefix transmitting power transmission access request of using this to calculate;
Wherein, this method further is included in base station side filter is set, and then described revised uplink interference power is filtered uplink interference power; Then in steps A, the base station comprises the step that uplink interference power carries out correcting process: the base station is imported measured uplink interference power in the described filter, by filter the uplink interference performance number that receives is carried out filtering, and export filtered uplink interference performance number to base station;
Perhaps,
This method further comprises the uplink interference power threshold is set, then in steps A, the base station comprises the step that uplink interference power carries out correcting process: the base station judges that whether the value of measured uplink interference power is greater than set uplink interference power threshold, if, then abandon the value of the current uplink interference power of measuring, and use the value of the value of the uplink interference power of measuring last time as this revised uplink interference power, otherwise, the value of this uplink interference power of measuring is preserved in the base station, and with the value of this uplink interference power of the measuring value as this revised uplink interference power.
Described filter is a αLv Boqi;
In steps A, the step that described filter carries out filtering to the uplink interference performance number that receives comprises: αLv Boqi with the value of this uplink interference power that receives as the Xn in the filtering formula, filtered uplink interference performance number Yn-1 with the value of this Xn, predetermined filter coefficient alpha, output last time brings among filtering formula Yn=α * Yn-1+ (1-α) * Xn then, and αLv Boqi is with the value of the Yn that the calculated value as this filtered uplink interference power then.
The value of described filter coefficient alpha is to determine according to the requirement of the requirement of system side signal smoothing degree and filtering speed.
As seen, the present invention proposes terminal is carried out in the method for open loop power control, the base station of network side is after measuring the uplink interference power RTWP of system, not directly the RTWP that measures to be sent to terminal, but at first the RTWP that measures is carried out correcting process, replace processing such as Filtering Processing and exceptional value, then revised RTWP is sent to terminal.Because correcting process has been carried out to the RTWP that measures in the base station, so it is inaccurate to eliminate the measured value of the RTWP that network side causes owing to bursty interference, uplink interference power with respect to system in the practical business environment is too high, can't reflect the shortcoming of the uplink interference power of system in the practical business environment truly.Like this, then can guarantee in subsequent process, terminal calculate initial prefix transmitting power institute foundation RTWP value accurately and reliably, thereby guaranteed that network side carries out open loop power control accurately and reliably to terminal, improved the performance of terminal open loop power control greatly, reduced interference, improved the capacity of system greatly, improved the QoS of system other user in the system.
Description of drawings
Fig. 1 is prior art is carried out open loop power control to terminal a flow chart.
Fig. 2 is the flow chart of the embodiment of the invention.
Fig. 3 A is the schematic diagram that in embodiments of the present invention RTWP is carried out the RTWP measured value before the filtering.
Fig. 3 B is the schematic diagram that in embodiments of the present invention RTWP is carried out the RTWP ' of gained after the filtering.
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 drawings and the specific embodiments.
Core concept of the present invention is: when base station measurement went out the uplink interference power RTWP of system, correcting process was carried out to this RTWP in the base station, and revised RTWP is sent to terminal; When terminal need connect with network side, terminal was calculated initial prefix transmitting power according to the up-to-date revised RTWP that receives, and used this initial prefix transmitting power that calculates to send the request of access.
Fig. 2 is the flow chart of the embodiment of the invention.Referring to Fig. 2, the process that the present invention carries out open loop power control to terminal specifically may further comprise the steps:
Step 201: Primary Common Pilot Channel transmitted power PCPICH_Tx_Power is broadcasted by system message 5 in the base station of network side on intercycle ground, sub-district.
Step 202: terminal receives this PCPICH_Tx_Power, and uses the up-to-date PCPICH_Tx_Power that receives to upgrade the PCPICH_Tx_Power that is preserved.
Step 203: the base station is by system message 5 broadcast terminal initial transmit power offsets amount Const_Value in the sub-district.
Step 204: terminal receives this Const_Value, and uses the up-to-date Const_Value that receives to upgrade the Const_Value that is preserved.
Step 205: the base station is the uplink interference power RTWP of measuring system periodically.
The specific implementation process of this step is a prior art, but can simply be described as: base station every 100ms power is to received signal measured and is average, obtains RTWP.
Above-mentioned steps 201 is identical to the corresponding implementation procedure of the implementation procedure of step 205 and prior art.
Step 206: when measuring uplink interference power RTWP, correcting process is carried out to the value of measured RTWP in the base station, and broadcasts the value of revised RTWP in the sub-district by system message 7.
Here, described correcting process can be processing such as Filtering Processing or exceptional value replacement.
When described correcting process is Filtering Processing, the present invention is provided with a filter in base station side in advance, like this, in this step, when measuring uplink interference power RTWP, this filter is all imported with the RTWP that measures in the base station, by this filter the RTWP value is carried out Filtering Processing, and exports filtered RTWP value.
Preferably, the filter that the present invention sets in advance can be αLv Boqi, because the filtering formula of αLv Boqi is: Y
n=α * Y
N-1+ (1-α) * X
n, wherein, X
nFor the base station at this RTWP value of measuring and importing, Y
N-1Be the filtered RTWP value of αLv Boqi output last time, Y
nThis filtered RTWP value that need export for αLv Boqi, α is a filter factor, span is (0～1), and the α value is big more, history value Y
N-1Be last time filtered RTWP value big more to the influence of this filtered RTWP value that need export, the signal of the RTWP value of output is level and smooth more, but to the signal X of RTWP value of input
nReflection relatively slow.Like this, the present invention can determine the value of α in the αLv Boqi according to the practical business demand, that is to say, when determining the value of α, take all factors into consideration the requirement of signal smoothing degree and the requirement of filtering speed, it is reasonably level and smooth both to have guaranteed that output signal obtained, and guarantees the trend of output signal reflected input signal variation faster simultaneously again.Such as, the value of α can be taken as 0.7 or 0.8.Like this, in this step, when measuring uplink interference power RTWP, the base station is the value of this RTWP that measures input αLv Boqi, αLv Boqi with the value of this RTWP that receives as the X in the filtering formula
n, then with this X
n, fixed filter coefficient alpha the filtered RTWP value Y of value, last time output
N-1Bring filtering formula Y into
n=α * Y
N-1+ (1-α) * X
nIn, αLv Boqi is exported the Y that is calculated to the base station then
n, the base station is with the Y of αLv Boqi output
nAs the value that after this Filtering Processing is the RTWP after the correcting process.
Here, referring to Fig. 3 A, Fig. 3 A is the schematic diagram that in embodiments of the present invention RTWP is carried out the RTWP measured value before the filtering.Before not carrying out filtering, when bursty interference occurring, raising significantly will appear in the measured value of the RTWP that base station measurement goes out, has influenced the accuracy of the measured value of RTWP greatly.Fig. 3 B is the schematic diagram that in embodiments of the present invention RTWP is carried out the RTWP ' of gained after the filtering.Referring to Fig. 3 B, after carrying out filtering, even bursty interference occurred, because filtering has been carried out to the measured value of the RTWP that measures in the base station, so can eliminate the influence of interference greatly, obtain the measured value of RTWP accurately, make the measured value of RTWP reflect the uplink interference power of system truly.
In this step, when the correcting process that is adopted is exceptional value replacement processing, the present invention requires according to practical business and empirical value in the past sets in advance a RTWP threshold value, like this, the specific implementation process of this step comprises: when measuring uplink interference power RTWP, the base station judges that whether the value of the RTWP that this is measured is greater than predefined RTWP threshold value, if greater than, then abandon the value of this RTWP that measures, and use the value of the RTWP that measured last time, that is to say, the value of the RTWP that will measure last time is as the value of this revised RTWP, if be not more than, then preserve the value of this RTWP that measures, and with the value of this RTWP that measures directly as the value of this revised RTWP.
Step 207: terminal receives the revised RTWP that broadcast the base station, and uses the up-to-date RTWP that receives to upgrade the RTWP that is preserved in self.
Step 208: Primary Common Pilot Channel power CPICH_Rscp is measured on terminal periodic ground, and uses the up-to-date CPICH_Rscp that measures to upgrade the CPICH_Rscp that is preserved.
Need to prove, above-mentioned steps 201 to the process of step 208 be the present invention for convenience of description and the different step that splits, in the business realizing of reality, above-mentioned steps 201 to the process of step 208 there is no the sequencing in the fixing execution.
Step 209: when terminal need connect with network side, terminal is brought the value of the up-to-date PCPICH_Tx_Power that receives, CPICH_Rscp, RTWP and the Const_Value that are preserved in self among the formula Preamble_Initial_Power=PCPICH_Tx_Power-CPICH_Rscp+RTWP+C onst_Value into, calculates initial prefix transmitting power Preamble_Initial_Power.
Step 210: terminal initiates to insert request with the initial prefix transmitting power that is calculated to network side.
In a word, the above is preferred embodiment of the present invention only, is 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 (3)
1, a kind of terminal is carried out the method for open loop power control, it is characterized in that this method comprises:
Correcting process is carried out to the uplink interference power of measuring in A, base station, and revised uplink interference power is sent to terminal;
B, terminal are according to the up-to-date initial prefix transmitting power of revised uplink interference power calculation that receives, and initial prefix transmitting power transmission access request of using this to calculate;
Wherein, this method further is included in base station side filter is set, and then described revised uplink interference power is filtered uplink interference power; Then in steps A, the base station comprises the step that uplink interference power carries out correcting process: the base station is imported measured uplink interference power in the described filter, by filter the uplink interference performance number that receives is carried out filtering, and export filtered uplink interference performance number to base station;
Perhaps,
This method further comprises the uplink interference power threshold is set, then in steps A, the base station comprises the step that uplink interference power carries out correcting process: the base station judges that whether the value of measured uplink interference power is greater than set uplink interference power threshold, if, then abandon the value of the current uplink interference power of measuring, and use the value of the value of the uplink interference power of measuring last time as this revised uplink interference power, otherwise, the value of this uplink interference power of measuring is preserved in the base station, and with the value of this uplink interference power of the measuring value as this revised uplink interference power.
2, method according to claim 1 is characterized in that, described filter is a αLv Boqi;
In steps A, the step that described filter carries out filtering to the uplink interference performance number that receives comprises: αLv Boqi with the value of this uplink interference power that receives as the X in the filtering formula
n, then with this X
n, predetermined filter coefficient alpha the filtered uplink interference performance number Y of value, last time output
N-1Bring filtering formula Y into
n=α * Y
N-1+ (1-α) * X
nIn, αLv Boqi is with the Y that is calculated then
nValue as the value of this filtered uplink interference power.
3, method according to claim 2 is characterized in that, the value of described filter coefficient alpha is to determine according to the requirement of the requirement of system side signal smoothing degree and filtering speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100005814A CN100546214C (en) | 2006-01-11 | 2006-01-11 | A kind of method of terminal being carried out open loop power control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100005814A CN100546214C (en) | 2006-01-11 | 2006-01-11 | A kind of method of terminal being carried out open loop power control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1859028A CN1859028A (en) | 2006-11-08 |
| CN100546214C true CN100546214C (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100005814A Expired - Fee Related CN100546214C (en) | 2006-01-11 | 2006-01-11 | A kind of method of terminal being carried out open loop power control |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4818942B2 (en) * | 2007-01-19 | 2011-11-16 | 株式会社エヌ・ティ・ティ・ドコモ | Base station apparatus and communication control method |
| CN102573035B (en) * | 2011-12-26 | 2015-04-29 | 华为技术有限公司 | Method for setting power for terminal, and base station |
| CN103369649B (en) * | 2012-04-06 | 2018-01-05 | 中兴通讯股份有限公司 | The open loop Power Control adjustment of network assistance |
| CN107241792A (en) * | 2016-03-28 | 2017-10-10 | 中兴通讯股份有限公司 | Bandwidth receives total power value control method, device and communication system |
| CN108966336A (en) * | 2018-07-03 | 2018-12-07 | 深圳市信通飞扬科技有限公司 | A kind of power control realization method and system of multi-standard |
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| CN1859028A (en) | 2006-11-08 |
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