CN1893302A - Power control method, system and apparatus in wineless communication system - Google Patents
Power control method, system and apparatus in wineless communication system Download PDFInfo
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- CN1893302A CN1893302A CN 200510080891 CN200510080891A CN1893302A CN 1893302 A CN1893302 A CN 1893302A CN 200510080891 CN200510080891 CN 200510080891 CN 200510080891 A CN200510080891 A CN 200510080891A CN 1893302 A CN1893302 A CN 1893302A
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Abstract
The invention discloses a method, system and equipment for controlling power. The core of the method is that based on information reported from mobile terminal, base station determines up going transmission parameter of mobile terminal; based on up going transmission parameter, base station determines power offset parameter needed to adjust for mobile terminal, and sends down the power offset parameter to the mobile terminal; based on up going transmission parameter measured and calculated, and power offset parameter sent from the base station, mobile terminal carries out power control in open loop. The invention can determines power offset parameter needed to adjust precisely so as to prevent unstable effect of mobile terminal in procedure of controlling power in open loop. Thus, the invention raises quality of channel and stability of system.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to Poewr control method, system and device in a kind of wireless communication system.
Background technology
Power control is the key technology in the mobile radio system, for overcoming shadow fading, rapid fading, near-far interference, saves transmitting power, and reducing to disturb to wait has important effect.
Uplink power control in the power control is divided into: open loop power control and closed-loop power control, and open loop power control can be divided into initiatively open loop power control and passive open loop power control.
Being example with the Wimax system below is described the implementation method of the open loop power control in the mobile radio system.
At first, the base station enters the open Loop Power control pattern by PMC_RSP order notice portable terminal SS.
Then, SS calculates the uplink transmission power of its each carrier wave that oneself sends according to formula (1):
P＝L+C/N+NI-10log?10(R)+Offset_SSperSS+Offset_BsperSS (1)
Wherein: P is the transmitter antenna gain (dBi) that the transmitting power of current each subcarrier comprises SS; L is that current uplink loss is estimated, include in this uplink loss estimated value the antenna emission antenna gain and path loss, do not comprise receiving antenna gain; C/N is the code used signal to noise ratio that is modulated at the receiving terminal needs of uplink; The R multiple modulation coding number of times of attaching most importance to; NI estimates for the average interference level of each subcarrier that the BS side joint is received, does not comprise receiving gain in this average interference level estimated value; Offet_SsperSS is that its initial value is provided by PMC_RSPMAC message by BS by the SS transmitting power correction value of SS control; Offset_BsperSS is by the SS transmitting power correction of BS control, is provided with by PMC_RSPMACmessage by BS, includes the receiving antenna gain of BS among the Offset_BsperSS.
Offset_BSperSS has relatively and fixes 2 kinds of forms, and under fixed form, BS is by the value of PMC_RSP information updating Offset_BSperSS.Under relative form, BS issues the power adjustment information by downstream messages such as rapid power control FPC message, Power control IE (power control cell) and RNG_RSP, these information all are relative values, and the accumulated value of these information is the value of Offdet_BSperSS.
Under passive open loop power control pattern, Offset_SsperSS is set to 0, SS oneself estimates the uplink loss, accept the power correction order of BS, and calculate its uplink transmission power according to uplink loss, the Offset_BSperSS that revises in the order, be that SS does not adjust the Offset_SSperSS parameter, revise transmitting power and only rely on Offset_BSperSS.
Under active open loop power control pattern, SS can adjust Offset_SsperSS within the specific limits, and calculates its uplink transmission power according to the Offset_BsperSS in Offset_SsperSS, uplink loss, the correction order.
SS with its uplink transmission power that calculates as its current uplink transmission power.
From foregoing description as can be known, no matter under active open loop power control pattern, still under passive open loop power control pattern, SS needs Offset_BSperSS as a parameter of calculating in its uplink transmission power, but, under active open loop power control pattern, BS is to SS transmitted power adjustment order the time, and do not know L numerical value that SS estimates and the numerical value of Offset_SsperSS, under passive open loop power control pattern, BS is to SS transmitted power adjustment order the time, and do not know the L numerical value that SS estimates, so the adjustment amount and the uplink loss of the uplink transmission power that the Offset_BSperSS that BS issues to SS may estimate with SS are misfitted, thereby can cause the power of user terminal to control unsettled phenomenon.
Summary of the invention
The objective of the invention is to, Poewr control method, system and device in a kind of wireless communication system are provided, the base station changes to determine the power bias parameter of portable terminal by the channel circumstance according to portable terminal, effectively avoid the power control wild effect of portable terminal, realized improving the purpose of the channel quality and the stability of a system.
For achieving the above object, the Poewr control method in the wireless communication system provided by the invention comprises:
Power control system in the wireless communication system of the present invention comprises:
The uplink parameter of portable terminal is determined in a, base station according to the information of mobile terminal reporting;
The power bias parameter that the portable terminal needs are adjusted is determined according to this uplink parameter in b, base station, and described power bias parameter is issued to portable terminal;
C, portable terminal measure according to it and calculate the power bias parameter that the uplink parameter that obtains and base station issue and carry out open Loop Power control.
Described step a specifically comprises:
A1, when predetermined condition satisfies, portable terminal reports to the base station with its uplink transmission power information;
The uplink parameter of portable terminal is determined in a2, base station according to the information of mobile terminal reporting.
Described uplink transmission power information comprises: the difference of uplink transmission power and/or uplink transmission power and maximum transmission power.
Described predetermined condition is: the time interval that portable terminal reports for twice surpasses scheduled duration and/or power control fluctuation surpasses predetermined threshold.
The setting predetermined threshold is Tx_Power_Report_Threshold (dB), and described power control fluctuation specifically comprises above predetermined threshold:
|M
avg(nlast)-M
avg(n)|≥Tx_Power_Report_Threshold(dB)；
Wherein: the time that nlast reported for portable terminal last time, n is the current time, and M
Avg(nlast) for reported the moment last time to portable terminal till, the mean value of the summation M (n) of the uplink loss L that power bias parameter Offset_SSperSS that the power bias parameter Offset_BSperSS that the base station issues, portable terminal oneself are adjusted and portable terminal oneself are estimated, M
Avg(n) be the mean value of M (n) till the current time.
Described mean value M
Avg(nlast) be:
M
avg(nlast)＝10log(α
p_avg.10
M(nlast)/10+(1-α
p_avg).10
(Mavg(nlast-1))/10)；
Described mean value M
Avg(n) be:
M
avg(n)＝10log(α
p_avg.10
M(n)/10+(1-α
p_avg).10
(Mavg(n-1))/10)。
Described step a2 specifically comprises:
The uplink parameter that portable terminal is determined according to uplink transmission power information and its received power of mobile terminal reporting in the base station.
Described uplink parameter is: the ascending power offset parameter that uplink loss and/or portable terminal oneself adjusted.
Described method also comprised before step a:
The initial value of the power bias parameter that a ', portable terminal issue according to the base station is determined the uplink transmission power of portable terminal.The initial value of the power bias parameter that the base station issues among the described step a ' is the negative value and the predetermined value sum of base station receiving antenna gain.
Described step c specifically comprises:
Open Loop Power control is carried out in power bias parameter, uplink loss that described portable terminal issues according to the base station; Or the ascending power offset parameter that the power bias parameter that issues according to the base station of described portable terminal, uplink loss and portable terminal oneself are adjusted carries out open Loop Power control.
Described step c specifically comprises:
The power bias parameter that issues according to described base station is determined the uplink transmission power P of each subcarrier of portable terminal:
P=L+C/N+NI-10log 10 (R)+Offset_SSperSS+Offset_BsperSS; Or
P＝L+C/N+NI-10log?10(R)+Offset_BsperSS；
Wherein: L is the current uplink loss of portable terminal, and C/N is the code used signal to noise ratio that is modulated at the receiving terminal needs of uplink; The R multiple modulation coding number of times of attaching most importance to; NI estimates for the average interference level of each subcarrier that the BS side joint is received; Offset_SsperSS is the uplink transmission power bias by portable terminal control; Offset_BsperSS is the power bias initial parameter value that the base station issues;
Determine the uplink transmission power information of portable terminal according to the uplink transmission power of described each subcarrier.
Power control system in the wireless communication system provided by the invention, comprise: base station and portable terminal, be provided with in the described base station and obtain the uplink parameter module and issue the power bias parameter module, be provided with memory module, reporting module and open Loop Power control module in the described portable terminal;
Obtain the uplink parameter module: the uplink transmission power information that reports according to the reporting module of portable terminal is obtained the uplink parameter of portable terminal, and the uplink parameter transferred to issues the power bias parameter module;
Issue the power bias parameter module: determine the power bias parameter that the portable terminal needs are adjusted according to obtaining the next uplink parameter of uplink parameter module transmission, and be issued to the memory module of portable terminal;
Memory module: the power bias parameter that the storage base station issues;
Reporting module: measure and calculate the uplink parameter, determine the uplink transmission power information of portable terminal according to the power bias parameter of storing in the memory module, and when predetermined condition satisfies, obtain the uplink parameter module with what described uplink transmission power information reported to the base station;
Open Loop Power control module: measure the uplink parameter of calculating acquisition according to the power bias parameter of storing in the memory module, described reporting module and carry out open Loop Power control.
Base station provided by the invention comprises:
Obtain the uplink parameter module: obtain the uplink parameter of portable terminal according to the uplink transmission power information of mobile terminal reporting, and the uplink parameter transferred to issue the power bias parameter module;
Issue the power bias parameter module: according to obtain that uplink parameter module transmission comes the uplink parameter determine the power bias parameter that the portable terminal needs are adjusted, and be issued to portable terminal.
The present invention also provides a kind of portable terminal, is provided with memory module, reporting module and open Loop Power control module in the described portable terminal;
Memory module: the power bias parameter that the storage base station issues;
Reporting module: measure and calculating uplink parameter, determine the uplink transmission power information of portable terminal according to the power bias parameter of storing in the memory module, and when predetermined condition satisfies, described uplink transmission power information is reported to the base station;
Open Loop Power control module: measure the uplink parameter of calculating acquisition according to the power bias parameter of storing in the memory module, described reporting module and carry out open Loop Power control.
Description by technique scheme as can be known, the power bias parameter that the portable terminal needs are adjusted can accurately be determined according to the actual conditions of the up channel of portable terminal in base station among the present invention, and can be when the power control appearance of portable terminal be fluctuateed or is reported for twice the time interval long, issue the power bias parameter that its portable terminal of determining need be adjusted, effectively avoided the power control wild effect of portable terminal in the open Loop Power control process; Thereby realized improving the purpose of the channel quality and the stability of a system by technical scheme provided by the invention.
Description of drawings
Fig. 1 is a power control system schematic diagram of the present invention.
Embodiment
Variation along with channel circumstance, the uplink parameter of portable terminal also can change, the uplink loss L that estimates as SS can change, the value of the ascending power biasing Offset_SSperSS that SS oneself adjusts also can change, if base station BS can be determined power bias parameter Offset_BSperSS according to the concrete condition of portable terminal up channel, the concrete condition of the up channel of power bias parameter that the base station issues and portable terminal is coincide, thereby, make portable terminal carry out passive open Loop Power control in parameters such as power bias parameter Offset_BSperSS that issues according to the base station and uplink loss L, the perhaps power bias parameter Offset_BSperSS that issuing according to the base station of portable terminal, when parameters such as ascending power biasing Offset_SSperSS that SS oneself adjusts and uplink loss L are carried out the active open Loop Power control, can effectively avoid mobile terminal power to control unsettled phenomenon.
Therefore, core of the present invention is: the uplink parameter of portable terminal is determined in the base station according to the information of mobile terminal reporting, the power bias parameter that the portable terminal needs are adjusted is determined according to this uplink parameter in the base station, and described power bias parameter is issued to portable terminal, portable terminal is measured according to it and is calculated the power bias parameter that the uplink parameter that obtains and base station issue and carry out open Loop Power control.
Based on core concept of the present invention technical scheme provided by the invention is further described below.
Poewr control method of the present invention can be widely used in the wireless communication system, as Wimax system, TDD (time division duplex) system etc., TDD system such as TD-SCDMA etc.
Be that example is elaborated to Poewr control method of the present invention with the Wimax system below.
In the Wimax system, Poewr control method of the present invention comprises initiatively open Loop Power control and passive open Loop Power control.
Initiatively the specific implementation process of open-loop power control method is:
After step 1, SS receive the PMC_RSP order, be transformed into the active open Loop Power control pattern of open Loop Power control by the closed power control model.In this step, BS is when issuing the PMC_RSP order to SS, the initial value of the Offset_BSperSS of its setting can be issued to SS by the PMC_RSP order, the initial value of Offset_BSperSS can be set to the negative value and the predetermined value sum of BS receiving antenna gain, and making this initial value is the negative value of BS receiving antenna gain or the negative value that is slightly larger than the BS receiving antenna gain.
To step 2, SS oneself initial value of power bias parameter Offset_SSperSS is set, and calculates downlink transfer loss L according to descending targeting signal power that receives and known BS transmitting power.
Under tdd mode, can replace the uplink loss with descending loss.
Calculate uplink transmission power P on subcarrier of every frame to step 3, SS according to the initial value of the uplink loss L of every frame, Offset_BSperSS that BS issues and power bias parameter Offset_SsperSS that SS oneself adjusts:
P＝L+C/N+NI-10log10(R)+Offset_SSperSS+Offset_BsperSS；
Wherein: P is the uplink transmission power of current each subcarrier of portable terminal, and this uplink transmission power includes the transmitter antenna gain (dBi) of SS; L is the estimated value of the current uplink loss of portable terminal, include in this uplink loss estimated value antenna emission antenna gain and path loss, do not comprise receiving antenna gain; C/N is the code used signal to noise ratio that is modulated at the receiving terminal needs of uplink; The R multiple modulation coding number of times of attaching most importance to; NI does not comprise receiving gain for the average interference level estimated value of each subcarrier of BS side joint receipts in this average interference level estimated value; Offset_SsperSS is the uplink transmission power bias by portable terminal control; Offset_BsperSS is the power bias initial parameter value that the base station issues.
Behind the uplink transmission power P on the subcarrier in calculating every frame, calculate total transmitting power on all carrier waves of this frame according to number of subcarriers, and with the uplink transmission power of this total transmitting power that calculates as oneself.
Report the predetermined condition of its uplink transmission power information whether to satisfy, and when definite predetermined condition satisfies, report its uplink transmission power information to step 4, SS judgement to the base station to the base station.
Predetermined condition in this step can fluctuate for the power control of: portable terminal.
Portable terminal determines that the concrete grammar that fluctuation takes place the control of its power can find that amplitude and the difference that reported the moment uplink transmission power bias last time of uplink transmission power bias of its own current time adjustment is greater than predetermined threshold for: SS.
For guaranteeing stability, when determining difference, can do in time necessarily on average, as:
When | M
Avg(nlast)-M
Avg(n) | during 〉=Tx_Power_Report_Threshold (dB), can determine that initiatively open Loop Power control causes fluctuation excessive, power control may be inaccurate or unstable.
In the above-mentioned formula, Tx_Power_Report_Threshold (dB) is a predetermined threshold, and the time that nlast reported for portable terminal last time, n is the current time, and M
Avg(nlast) for reported the moment last time to portable terminal till, the mean value of the summation M (n) of the uplink loss L that power bias parameter Offset_SSperSS that the power bias parameter Offset_BSperSS that the base station issues, portable terminal oneself are adjusted and portable terminal oneself are estimated, M
Avg(n) be the mean value of M (n) till the current time.
Mean value M
Avg(nlast) be:
M
avg(nlast)＝10log(α
p_avg.10
M(nlast)/10+(1-α
p_avg).10
(Mavg(nlast-1))/10)；
Described mean value M
Avg(n) be:
M
avg(n)＝10log(α
p_avg.10
M(n)/10+(1-α
p_avg).10
(Mavg(n-1))/10)。
Wherein: M (n)=L+Offset_SSperSS+Offset_BSperSS (dB).
Predetermined condition in this step also can for: the time interval that reports for twice surpasses scheduled duration, as works as n-n
Last〉=Tx_Power_Report_Interval determines that the time interval that reports for twice surpasses scheduled duration.
Wherein: n
LastBeing last time reports moment of its uplink transmission power to the base station, and n is a current time, and Tx_Power_Report_Interval is a scheduled duration.
SS can be the uplink transmission power of SS to the uplink transmission power information that the base station reports, can be the difference of the uplink transmission power uplink transmission power maximum of SS with it, equally, also can be the difference of the uplink transmission power uplink transmission power maximum of the uplink transmission power of SS and SS with it.
Receive the report of SS to step 5, BS after, according to uplink transmission power information in the report and the received power that receives of BS oneself, can calculate the uplink loss L of portable terminal and the uplink parameters such as uplink transmission power bias Offset_SsperSS of portable terminal oneself control adjustment accurately.
Thus, BS can calculate the bias Offset_BsperSS of the uplink transmission power that needs order SS also adjusts again exactly according to L and Offset_SSperSS, to correct the uplink transmission power control deviation of portable terminal.
To step 6, BS issues it by descending PMC_RSP message to SS and calculates the Offset_BsperSS that obtains, SS is according to uplink loss L, the Offset_BsperSS that power bias parameter Offset_SsperSS that oneself adjusts and BS issue utilizes formula P=L+C/N+NI-10log 10 (R)+Offset_SSperSS+Offset_BsperSS to calculate uplink transmission power P on carrier wave of every frame, and calculate total transmitting power of all carrier waves, simultaneously, with total transmitting power of calculating as its uplink transmission power, the uplink transmission power of SS is recovered steadily, thereby, finished initiatively open Loop Power control process.
From top description as can be seen, SS is when carrying out the active open Loop Power control, BS is only when the initial procedure of active open Loop Power control and SS power control fluctuation, just send the uplink transmission power control messages, help SS to carry out the adjustment of uplink transmission power, avoid SS when oneself adjusts uplink transmission power, to receive the uplink transmission power control messages of BS, caused uplink transmission power adjustment confusion, power to control jiggly phenomenon.
The specific implementation process of passive open-loop power control method is:
After step 1, SS receive the PMC_RSP order, be transformed into the passive open Loop Power control pattern of open Loop Power control by the closed power control model.In this step, BS is when issuing the PMC_RSP order to SS, the initial value of the Offset_BSperSS of its setting can be issued to SS by the PMC_RSP order, the initial value of Offset_BSperSS can be set to the negative value and the predetermined value sum of BS receiving antenna gain, and making this initial value is the negative value of BS receiving antenna gain or the negative value that is slightly larger than the BS receiving antenna gain.
The numerical value that power bias parameter Offset_SSperSS is set to step 2, SS is 0, and calculates downlink transfer loss L according to descending targeting signal power that receives and known BS transmitting power.
Under TDD (time division duplex) pattern, can replace the uplink loss with descending loss.
Calculate uplink transmission power P on subcarrier of every frame to step 3, SS according to the initial value of the uplink loss L of every frame, Offset_BSperSS that BS issues:
P＝L+C/N+NI-10log?10(R)+Offfset_SSperSS+Offset_BsperSS；
Wherein: P is the uplink transmission power of current each subcarrier of portable terminal, and this uplink transmission power includes the transmitter antenna gain (dBi) of SS; L is the estimated value of the current uplink loss of portable terminal, include in this uplink loss estimated value antenna emission antenna gain and path loss, do not comprise receiving antenna gain; C/N is the code used signal to noise ratio that is modulated at the receiving terminal needs of uplink; The R multiple modulation coding number of times of attaching most importance to; NI does not comprise receiving gain for the average interference level estimated value of each subcarrier of BS side joint receipts in this average interference level estimated value; Offset_SsperSS is the uplink transmission power bias by portable terminal control, and the numerical value of Offset_SSperSS is 0; Offset_BsperSS is the power bias initial parameter value that the base station issues.
Behind the uplink transmission power P on the subcarrier in calculating every frame, calculate total transmitting power on all carrier waves of this frame according to number of subcarriers, and with the uplink transmission power of this total transmitting power that calculates as oneself.
Report the predetermined condition of its uplink transmission power information whether to satisfy, and when definite predetermined condition satisfies, report its uplink transmission power information to step 4, SS judgement to the base station to the base station.
Predetermined condition in the passive open Loop Power control is identical with predetermined condition in the open Loop Power control initiatively, is not described in detail at this.
SS can be the UL transmitting power of SS to the uplink transmission power information that the base station reports, can be the difference of the UL transmitting power uplink transmission power maximum of SS with it, equally, also can be the difference of the UL transmitting power uplink transmission power maximum of the UL transmitting power of SS and SS with it.
Receive the report of SS to step 5, BS after,, can calculate the uplink parameters such as uplink loss L of portable terminal accurately according to uplink transmission power information in the report and the received power that receives of BS oneself.
Thus, BS can calculate the bias Offset_BsperSS of the uplink transmission power that needs order SS also adjusts again exactly according to L, to correct the uplink transmission power control deviation of portable terminal.
Issue it by message such as descending PMC_RSP to SS to step 6, BS and calculate the Offset_BsperSS that obtains, the Offset_BsperSS that SS issues according to uplink loss L and BS utilizes formula P=L+C/N+NI-10log 10 (R)+Offset_SSperSS+Offset_BsperSS to calculate uplink transmission power P on carrier wave of every frame, and calculate total transmitting power of all carrier waves, simultaneously, with total transmitting power of calculating as its uplink transmission power, the uplink transmission power of SS is recovered steadily, thereby, finished passive open Loop Power control process.
When method of the present invention is used for other system, it realizes the basic identical of principle and foregoing description substantially, all be that the power bias parameter that the portable terminal needs are adjusted is accurately determined according to the actual conditions of the up channel of portable terminal in the base station, just have any different at aspect such as PMC_RSP order and foregoing description process, the present invention specifically is applied in this and is not described in detail other system.
Power control system in the wireless communication system provided by the invention describes power control system of the present invention, base station, portable terminal below by Fig. 1 as shown in Figure 1.
In Fig. 1, power control system of the present invention mainly comprises: base station and portable terminal, be provided with in the base station and obtain the uplink parameter module and issue the power bias parameter module, be provided with memory module, reporting module and open Loop Power control module in the portable terminal.
The uplink parameter module that obtains in the base station is mainly used in the uplink parameter that uplink transmission power information that the reporting module according to portable terminal reports accurately calculates portable terminal, and the uplink parameter transferred to issues the power bias parameter module.
Issue the power bias parameter module and be mainly used in the initial value that issues the power bias parameter in the starting stage of open Loop Power control to the memory module of portable terminal, and when receiving the uplink parameter of uplink parameter module transmission, calculate the power bias parameter that portable terminal need be adjusted, and be issued to the memory module of portable terminal.
The memory module of portable terminal is mainly used in and receives and the initial value that issues the power bias parameter that the power bias parameter module issues of storage base station and by calculating the power bias parameter that obtains, and when receiving above-mentioned parameter, this parameter is transferred to reporting module.
Under the active open loop mode, reporting module is mainly used in the estimated value L that calculates current uplink loss, and when receiving the power bias parameter that power bias initial parameter value that memory module transmission comes or base station side calculate, the power bias parameter of determining according to power bias parameter and the portable terminal oneself of estimated value L, power bias initial parameter value/calculate is determined the uplink transmission power of portable terminal, when predetermined condition satisfies, obtain the uplink parameter module with what the uplink transmission power information of portable terminal reported to the base station.
Under passive open loop mode, reporting module is mainly used in the estimated value L that calculates current uplink loss, and when receiving the power bias parameter that power bias initial parameter value that memory module transmission comes or base station side calculate, determine the uplink transmission power of portable terminal according to estimated value L, power bias initial parameter value/power bias parameter that calculates, when predetermined condition satisfies, obtain the uplink parameter module with what the uplink transmission power information of portable terminal reported to the base station.
The above-mentioned process of judging that whether predetermined condition satisfy is identical with the description of method in the present embodiment, is not described in detail at this.
The open Loop Power control module is mainly used in the estimated value L of the uplink loss that obtains according to the power bias parameter of storing in the memory module, described reporting module measurement calculating, the power bias parameter that portable terminal oneself is determined is carried out the active open Loop Power control.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (15)
1, the Poewr control method in a kind of wireless communication system is characterized in that, comprising:
The uplink parameter of portable terminal is determined in a, base station according to the information of mobile terminal reporting;
The power bias parameter that the portable terminal needs are adjusted is determined according to this uplink parameter in b, base station, and described power bias parameter is issued to portable terminal;
C, portable terminal measure according to it and calculate the power bias parameter that the uplink parameter that obtains and base station issue and carry out open Loop Power control.
2, the Poewr control method in a kind of wireless communication system as claimed in claim 1 is characterized in that described step a specifically comprises:
A1, when predetermined condition satisfies, portable terminal reports to the base station with its uplink transmission power information;
The uplink parameter of portable terminal is determined in a2, base station according to the information of mobile terminal reporting.
3, the Poewr control method in a kind of wireless communication system as claimed in claim 2 is characterized in that, described uplink transmission power information comprises: the difference of uplink transmission power and/or uplink transmission power and maximum transmission power.
4, the Poewr control method in a kind of wireless communication system as claimed in claim 2 is characterized in that described predetermined condition is: the time interval that portable terminal reports for twice surpasses scheduled duration and/or power control fluctuation surpasses predetermined threshold.
5, the Poewr control method in a kind of wireless communication system as claimed in claim 4 is characterized in that: the setting predetermined threshold is Tx_Power_Report_Threshold (dB), and described power control fluctuation specifically comprises above predetermined threshold:
|M
avg(nlast)-M
avg(n)|≥Tx_Power_Report_Threshold(dB)；
Wherein: the time that nlast reported for portable terminal last time, n is the current time, and M
Avg(nlast) for reported the moment last time to portable terminal till, the mean value of the summation M (n) of the uplink loss L that power bias parameter Offset_SSperSS that the power bias parameter Offset_BSperSS that the base station issues, portable terminal oneself are adjusted and portable terminal oneself are estimated, M
Avg(n) be the mean value of M (n) till the current time.
6, the Poewr control method in a kind of wireless communication system as claimed in claim 5 is characterized in that, described mean value M
Avg(nlast) be:
M
avg(nlast)＝10log(α
p_avg.10
M(nlast)/10+(1-α
p_avg).10
(Mavg(nlast-1))/10)；
Described mean value M
Avg(n) be:
M
avg(n)＝10log(α
p_avg.10
M(n)/10+(1-α
p_avg).10
(Mavg(n-1))/10)。
7, the Poewr control method in a kind of wireless communication system as claimed in claim 2 is characterized in that described step a2 specifically comprises:
The uplink parameter that portable terminal is determined according to uplink transmission power information and its received power of mobile terminal reporting in the base station.
As the Poewr control method in the described a kind of wireless communication system of arbitrary claim in the claim 1 to 7, it is characterized in that 8, described uplink parameter is: the ascending power offset parameter that uplink loss and/or portable terminal oneself adjusted.
9, as the Poewr control method in the described a kind of wireless communication system of arbitrary claim in the claim 1 to 7, it is characterized in that described method also comprised before step a:
The initial value of the power bias parameter that a ', portable terminal issue according to the base station is determined the uplink transmission power of portable terminal.
10, the Poewr control method in a kind of wireless communication system as claimed in claim 9 is characterized in that, the initial value of the power bias parameter that the base station issues among the described step a ' is the negative value and the predetermined value sum of base station receiving antenna gain.
11, as the Poewr control method in the described a kind of wireless communication system of arbitrary claim in the claim 1 to 7, it is characterized in that described step c specifically comprises:
Open Loop Power control is carried out in power bias parameter, uplink loss that described portable terminal issues according to the base station; Or
The ascending power offset parameter that the power bias parameter that described portable terminal issues according to the base station, uplink loss and portable terminal oneself are adjusted carries out open Loop Power control.
12, the Poewr control method in a kind of wireless communication system as claimed in claim 11 is characterized in that described step c specifically comprises:
The power bias parameter that issues according to described base station is determined the uplink transmission power P of each subcarrier of portable terminal:
P=L+C/N+NI-10 log 10 (R)+Offset_SSperSS+Offset_BsperSS; Or
P＝L+C/N+NI-10?log?10(R)+Offset_BsperSS；
Wherein: L is the current uplink loss of portable terminal, and C/N is the code used signal to noise ratio that is modulated at the receiving terminal needs of uplink; The R multiple modulation coding number of times of attaching most importance to; NI estimates for the average interference level of each subcarrier that the BS side joint is received; Offset_SsperSS is the uplink transmission power bias by portable terminal control; Offset_BsperSS is the power bias initial parameter value that the base station issues;
Determine the uplink transmission power information of portable terminal according to the uplink transmission power of described each subcarrier.
13, the power control system in a kind of wireless communication system, comprise: base station and portable terminal, it is characterized in that, be provided with in the described base station and obtain the uplink parameter module and issue the power bias parameter module, be provided with memory module, reporting module and open Loop Power control module in the described portable terminal;
Obtain the uplink parameter module: the uplink transmission power information that reports according to the reporting module of portable terminal is obtained the uplink parameter of portable terminal, and the uplink parameter transferred to issues the power bias parameter module;
Issue the power bias parameter module: determine the power bias parameter that the portable terminal needs are adjusted according to obtaining the next uplink parameter of uplink parameter module transmission, and be issued to the memory module of portable terminal;
Memory module: the power bias parameter that the storage base station issues;
Reporting module: measure and calculate the uplink parameter, determine the uplink transmission power information of portable terminal according to the power bias parameter of storing in the memory module, and when predetermined condition satisfies, obtain the uplink parameter module with what described uplink transmission power information reported to the base station;
Open Loop Power control module: measure the uplink parameter of calculating acquisition according to the power bias parameter of storing in the memory module, described reporting module and carry out open Loop Power control.
14, a kind of base station is characterized in that, is provided with in the described base station to obtain the uplink parameter module and issue the power bias parameter module;
Obtain the uplink parameter module: obtain the uplink parameter of portable terminal according to the uplink transmission power information of mobile terminal reporting, and the uplink parameter transferred to issue the power bias parameter module;
Issue the power bias parameter module: according to obtain that uplink parameter module transmission comes the uplink parameter determine the power bias parameter that the portable terminal needs are adjusted, and be issued to portable terminal.
15, a kind of portable terminal is characterized in that, is provided with memory module, reporting module and open Loop Power control module in the described portable terminal;
Memory module: the power bias parameter that the storage base station issues;
Reporting module: measure and calculating uplink parameter, determine the uplink transmission power information of portable terminal according to the power bias parameter of storing in the memory module, and when predetermined condition satisfies, described uplink transmission power information is reported to the base station;
Open Loop Power control module: measure the uplink parameter of calculating acquisition according to the power bias parameter of storing in the memory module, described reporting module and carry out open Loop Power control.
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| CN 200510080891 CN1893302A (en) | 2005-07-08 | 2005-07-08 | Power control method, system and apparatus in wineless communication system |
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| CN 200510080891 CN1893302A (en) | 2005-07-08 | 2005-07-08 | Power control method, system and apparatus in wineless communication system |
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