CN101895899B - Method and system for controlling uplink power - Google Patents
Method and system for controlling uplink power Download PDFInfo
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Abstract
The invention discloses a method and a system for controlling uplink and downlink power, which relate to the field of wireless communication and can reduce the outdoor interference caused by indoor communication. According to the invention, according to downlink signal sampling data of an adjacent cell, a downlink interference control threshold corresponding to an indoor cell is calculated; according to the downlink signal sampling data of the indoor cell, an uplink interference control threshold corresponding to the indoor cell is calculated; during power control, judgment for downlink and/or downlink transmission power is implemented on a terminal inside the indoor cell, if the downlink transmission power of network side to the terminal is larger than the downlink interference control threshold according to the power control judgment result after the power control, power adjustment is not performed according to the judgment result, instead, the downlink transmission power of the terminal is adjusted to the downlink interference control threshold. And if the uplink transmission power of the terminal is larger than the uplink interference control threshold according to the power control judgment result after the power control, the uplink transmission power of the terminal is adjusted to the uplink interference control threshold.
Description
Technical field
The present invention relates to wireless communication field, particularly power control techniques.
Background technology
Code division multiple access (Code Division Multiple Access; Abbreviation " CDMA ") communication system is occupied critical role in mobile communication; Especially at 3G (Third Generation) Moblie (The Third Generation; Be called for short " 3G ") in, three comparatively ripe big standards all belong to the category of CDMA.In cdma system, because all users have identical frequency, interference problem each other is outstanding, so power control is very crucial.No matter be up link or down link, transmitting power remained on the minimum power level that can satisfy the communication quality requirement be very important because the too small meeting of power causes the user discontented to communication quality, and power too conference reduce the communication system efficiency of operation.
Prior art generally has two kinds of Poewr control methods: open Loop Power control and closed power control.
Wherein, open Loop Power control is mainly used in the Initial Trans of confirming the user, or the transmission power adjustment of user's received signal code power when undergoing mutation.The effect of interference that system is actual and power control is decided by closed power control, and closed power control comprises exterior ring power control and inner loop power control again.
The power control mechanism of 3GPP regulation is as shown in Figure 1, comprises exterior ring power control and inner loop power control.The target of " external circule power control " is according to service needed; In time adjust target signal to noise ratio (Signal to Interference Ratio; Be called for short " SIR ") value, make miscellaneous service reach under the situation of this target SIR, less Block Error Rate (Block Error Rate can be arranged; Be called for short " BLER "), guarantee quality of service.The target of " inner-loop power control " is according to adjusted target SIR value, in time adjusts power, makes the signal to noise ratio substantially constant.
Inner loop power control comprises uplink power control and descending power control again.For uplink power control, the SIR of the up link between this base station and the terminal is detected in the base station, obtains the sir measurement value; The base station is sent inner-loop power control order TPC_CMD according to carrying out power control from the target SIR of radio network controller (Radio Network Controller is called for short " RNC ") with local sir measurement value to the terminal; TPC_CMD=f{C1, C2, C3; .., Cm}.Wherein C1, C2, C3 .. represent a power control commands that wireless connections are corresponding between terminal and base station respectively, and final power control commands is the function that every link receives orders.The mechanism of every power control commands generation is:
As the SIR that measures during less than target SIR, ring control command indicating terminal promotes a step-length with uplink transmission power in sending, promptly at SIR
Measure＜SIR
TargetThe time, Ci=+1.
As the SIR that measures during greater than target SIR, ring control command indicating terminal reduces a step-length with uplink transmission power in sending, promptly at SIR
Measure＞SIR
TargetThe time, Ci=-1.
Control for descending power; SIR to down link measures by the terminal; And SI reporting R measured value; The base station indicates this base station to promote or the reduction down transmitting power according to carrying out power control from the target SIR of RNC and the sir measurement value of terminal to report, and the concrete judgement and the principle of indication and uplink power control are similar.
The effect that power control can reach is: under the miscellaneous service condition, the descending SIR of detected up SIR in base station and terminal to report all converges to corresponding target SIR.
The variation of transmitting power is as shown in Figure 2 in above-mentioned power control process.Wherein Pmax representes the maximum power that the sub-district allows; Pmin representes the minimum power that the sub-district allows; P1c representes to be in the transmitting power convergency value at the terminal of cell edge; P2c representes the transmitting power convergency value near the terminal of base station, and T ' c representes the power convergence time near the terminal of base station, T " c representes to be in the power convergence time at the terminal of cell edge.
It is thus clear that; The terminal and near the final transmitting power in terminal the base station that are in cell edge all can be controlled in the power bracket of sub-district permission, among Fig. 2, and power bracket=Pmax-Pmin that the sub-district allows; This value does not change with the position at terminal, is to confirm through parameter in advance.
Inventor's discovery of the present invention, though existing power control algorithm can be applicable to the general networking situation of 3G; In some special scenes; As the building of indoor covering system has been installed, and exist indoor cell that outdoor cell is disturbed excessive problem, as shown in Figure 3.
Specifically; Because it is weak that power certainly exists in transmission course, make the value of power convergence between the different terminals have bigger difference, be in cell edge or at the terminal that covers bad zone; Transmitting power through converging to after the power control is bigger usually, like P1c among Fig. 2; Be in the base station and cover center or the regional preferably terminal of coverage condition, less usually through the transmitting power that converges to after the power control, like the P2c among Fig. 2.Because P1c and P2c all in the power bracket that the sub-district allows, therefore can not limit it in power control.Yet, for little base station, distributing antenna system or the WAP of the set inside indoor cell of (Access Point is called for short " AP ") in the building; Its cell edge partly is adjacent with outdoor cell, in this section in the adjacent areas, if the transmitting power at terminal is too high; Can produce outdoor cell and disturb, under the high building situation, will be bigger to the interference of outdoor network especially; Possibly cause the contraction of outdoor Serving cell, as shown in Figure 3.
According to actual WCDMA (Wideband Code Division Multiple Access is called for short " WCDMA ") network test experience, select to cover in the outdoor scene test cabinet interference effect that signal leaks outdoor signal is covered below.Indoor distributed system is installed in 8 floor machine rooms in this test.
Comprise in the test case that indoor pilot power is constant, increase 3dB, reduce under the situation such as 3dB outdoor cell to be tested, obtain test data statistics on the outdoor road.Analysis shows:
1, the indoor cell pilot power changes 3dB, and the Ec of outdoor cell (received energy of every chip) changes 1.2 to 1.7dB, and Ec/Io (received energy of every chip and the ratio of noise power spectral density) changes 0.3 to 0.5dB.That is to say that when the indoor cell pilot power increases 3dB, the Ec of outdoor cell will reduce by 1.2 to 1.7dB, Ec/Io will reduce by 0.3 to 0.5dB.
When 2, changing (increase and reduce) indoor coverage cell pilot power 3dB, soft-switch proportion changes obviously, indoor environment soft-switch proportion mean change 89.2%, outdoor environment soft-switch proportion mean change 45%.It is thus clear that the increase of indoor cell pilot power can cause rolling up of indoor cell and outdoor cell soft handover, takies a large amount of local resources, and be easy to generate call drop etc. in the process of soft handover and influence the phenomenon that the user embodies.
3, at outdoor 5 meters, outdoor cell pilot power Ec average is than the high 5dB of pilot power of indoor leakage output, and the soft-switch proportion that can control is about 30%; It is thus clear that indoor cell is bigger to the coverage of outdoor cell.
4, the indoor cell pilot power can be controlled soft-switch proportion about 30% than the high 10dB of outdoor pilot tone in penetrating.
Can find out that from this test case the building that indoor distributed system is installed is high more, the building is intensive more, indoor will be big more to outdoor interference.
Summary of the invention
The technical problem underlying that embodiment of the present invention will solve provides a kind of uplink and downlink Poewr control method and system, makes indoor communications can be able to reduce to outdoor interference.
For solving the problems of the technologies described above, execution mode of the present invention provides a kind of method for controlling downlink power, may further comprise the steps:
According to the downstream signal sampled data of the neighbor cell of indoor cell, calculate the corresponding descending interference control threshold of this indoor cell;
The terminal in the indoor cell is carried out the power control judgement of down transmitting power according to the power control correlation measure; If network side will then will be adjusted to this descending interference control threshold to the down transmitting power at this terminal greater than descending interference control threshold to the down transmitting power at this terminal after confirming power control according to the power control court verdict.
Execution mode of the present invention also provides a kind of ascending power control method, may further comprise the steps:
According to the upward signal sampled data of indoor cell, calculate the corresponding uplink interference control thresholding of this indoor cell;
Receive the actual uplink transmitting power at this terminal of terminal to report in the indoor cell;
The terminal in the indoor cell is carried out the power control judgement of uplink transmission power according to the power control correlation measure; If confirm that according to the power control court verdict actual uplink transmitting power at terminal will be controlled thresholding greater than uplink interference after the power control, then the actual uplink transmitting power at this terminal is adjusted to this uplink interference control thresholding.
Execution mode of the present invention also provides a kind of down power controlling system, comprising:
Computing unit is used for the downstream signal sampled data according to the neighbor cell of indoor cell, calculates the corresponding descending interference control threshold of this indoor cell;
The power control unit is used for according to the power control correlation measure terminal in the indoor cell being carried out the power control judgement and the power adjustment of down transmitting power;
Judging unit; Be used for power control court verdict according to the power control unit; Whether network side will be greater than descending interference control threshold, if then indicate the power control unit to adjust to this descending interference control threshold to the down transmitting power at this terminal to the down transmitting power at terminal after judging power control.
Execution mode of the present invention also provides a kind of uplink power control system, comprising:
Computing unit is used for the upward signal sampled data according to indoor cell, calculates the corresponding uplink interference control thresholding of this indoor cell;
The power receiving element is used to receive the actual uplink transmitting power at this terminal of terminal to report in the sub-district;
The power control unit is used for according to the power control correlation measure terminal in the sub-district being carried out the power control judgement and the power adjustment of uplink transmission power;
Judging unit; The actual uplink transmitting power at the terminal that is used for receiving according to the court verdict and the power receiving element of power control unit; Judge whether the actual uplink transmitting power at terminal will control thresholding greater than uplink interference after the power control, if greater than would indicate the power control unit that the actual uplink transmitting power at this terminal is adjusted to this uplink interference control thresholding.
Embodiment of the present invention compared with prior art; Main effect is: around indoor cell, exist under the situation of outdoor adjacent area; The descending power that can terminal in this indoor cell be received and the uplink transmission power at this terminal are controlled at one more suitably in the scope, reduce indoor communications to outdoor interference.In addition; Because the uplink and downlink interference control threshold that calculates is independent of an indoor cell; Thresholding according to each indoor cell of the difference of concrete environment is corresponding maybe be different, make power control combining environmental fully, so that arrive the effect promoting of power control best.
Description of drawings
Fig. 1 is a power control sketch map of the prior art;
Fig. 2 is that the signal under the power control of the prior art changes sketch map;
Fig. 3 is according to the interference sketch map of indoor cell signal in the prior art to the outdoor cell signal;
Fig. 4 is the method for controlling downlink power principle schematic according to first embodiment of the invention;
Fig. 5 is the method for controlling downlink power flow chart according to first embodiment of the invention;
Fig. 6 is the variation relation sketch map of indoor in the method for controlling downlink power according to first embodiment of the invention, outdoor attenuation and distance;
Fig. 7 is the ascending power control method principle schematic according to second embodiment of the invention;
Fig. 8 is the ascending power control method flow chart according to second embodiment of the invention;
Fig. 9 is the down power controlling system structure chart according to third embodiment of the invention;
Figure 10 is the uplink power control system construction drawing according to four embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that execution mode of the present invention is done to describe in detail further below.
First embodiment of the invention relates to a kind of method for controlling downlink power, is applicable to the power control of indoor cell.This execution mode mainly comprises three parts, and is as shown in Figure 4: one, in this indoor cell the neighbor cell downstream signal is carried out data sampling by sense terminals, and sampled data is sent to the base station of indoor cell.Two, the corresponding descending interference control threshold in this sub-district is calculated according to the downstream signal sampled data of the neighbor cell of indoor cell in the base station; Three, the terminal in this indoor cell is carried out the power control judgement of down transmitting power; If this descending interference control threshold will then will be adjusted to the down transmitting power at this terminal greater than descending interference control threshold to the down transmitting power at this terminal in the base station after confirming power control according to the power control court verdict.
Thereby exist under the situation of outdoor cell around the indoor cell, the descending power that terminal in this indoor cell is received is controlled at one more suitably in the scope, reduces indoor communications to outdoor interference.The base station of above-mentioned indoor cell also can be equipment such as distributed antenna system control appliance, little base station, repeater or AP, and above-mentioned power control judgement includes but not limited to the judgement of existing open loop power control, the judgement of closed-loop power control, the judgement of inner loop power, the judgement of exterior ring power.
In this execution mode, first, second part is referred to as the descending interference control threshold of training.The training of descending interference control threshold usually before system begins regular traffic is provided, as can the base station power on open after, carry out when debugging.In addition, can this partial function be controlled for this part is provided with a switch in RNC, open this switch when needed, begin to carry out the training of descending interference control threshold, if switch is not opened, then descending interference control threshold training function is inoperative.
Below at first to first---data sampling describes.In this part, in this indoor cell the neighbor cell downstream signal is carried out data sampling by sense terminals, and sampled data is sent to the base station of indoor cell.Specifically, sense terminals can receive outdoor cell to disturb bigger position to carry out data sampling near window, door or other.The data of being sampled comprise the received signal code power (P of neighbor cell
RSCP), can also comprise the Ec/Io of this sub-district and neighbor cell.
Suppose that this indoor cell has n neighbor cell, then the sense terminals data of sampling are:
This indoor cell: (P
RSCP)
Local, (Ec/Io)
Local,
Neighbor cell 1: (P
RSCP)
1, (Ec/Io)
1
Neighbor cell 2: (P
RSCP)
2, (Ec/Io)
2
……
Neighbor cell n: (P
RSCP)
n, (Ec/Io)
n
Sense terminals sends to these sampled datas the base station of indoor cell.Need to prove that in this step, what of sampled data can be selected according to actual conditions, can sample as much as possible, also can suitably reduce.
After obtaining sampled data, second portion---the sampled data that the base station reports according to sense terminals is calculated descending interference control threshold in entering.Specifically, average received signal code power is at first calculated according to the received signal code power of each neighbor cell in the base station, promptly
Then, this average received signal code power is added bias, obtain the corresponding descending interference control threshold P in this sub-district
Thr_DLThe bias here is usually in the scope of 5dB to 6dB.Suppose in this execution mode, to get 6dB, then P
Thr_DL=(P
RSCP)
AVG+ 6dB.
There are two kinds of implications in this formula, at the average received signal code power during greater than this indoor cell received signal code power, i.e. and (P
RSCP)
AVG＞(P
RSCP)
LocalThe time, above-mentioned formula is equivalent to P
Thr_DL=(P
RSCP)
Local+ | (P
RSCP)
Local-(P
RSCP)
AVG|+6dB; That is to say, earlier this sub-district received signal code power is supplied, under the situation that complements to the average received signal code power; Increase 6dB again; Thereby make the base station to the transmitting power of indoor terminal the high 6dB of average received signal code power than outdoor cell, at this moment, indoor less to outdoor interference.At the average received signal code power during less than this sub-district received signal code power, i.e. (P
RSCP)
AVG＜(P
RSCP)
LocalThe time, P
Thr_DL=(P
RSCP)
AVG+ 6dB that is to say, directly the base station is controlled at outdoor cell average received signal code power to the down transmitting power at this indoor cell terminal and adds in the scope of 6dB, makes indoor less to outdoor interference.
Because the descending interference control threshold that calculates is independent of an indoor cell; Thresholding according to each indoor cell of difference of concrete environment is corresponding maybe be different; Make power control combining environmental fully, so that arrive the effect promoting of power control best.
After calculating descending interference control threshold, get into third part---according to this thresholding descending power control is carried out at the terminal that resides in this indoor cell, specifically as shown in Figure 5.
In step 510; According to prior art; According to power control correlation measure (like the received power at SIR, terminal etc.) the power control judgement of down transmitting power is carried out at the terminal that resides in this indoor cell, comprised in the judgement of existing open loop, closed-loop power control, inner loop power, exterior ring power any one.
In step 520, current power control court verdict is judged if current power control court verdict is the down transmitting power of rise base station to this terminal, and the down transmitting power after raising then gets into step 530 greater than descending interference control threshold; Otherwise; If current power control court verdict is the down transmitting power of downward modulation base station to this terminal, perhaps, the power control court verdict is for raising the down transmitting power of base station to this terminal; But the down transmitting power after raising is less than or equal to descending interference control threshold, then gets into step 540.
In step 530, this descending interference control threshold is adjusted to the down transmitting power at this terminal in the base station.
In step 540, according to the down transmitting power of this power control court verdict adjustment base station to this terminal.
Because this descending interference control threshold adds 6dB for the average received signal code power; Thereby the base station to the down transmitting power maximum at indoor cell terminal only maybe than terminal average received in the outdoor cell to the big 6dB of down transmitting power (being the average received signal code power); Can learn according to simulation result; Indoor terminal can be accomplished communication in the case; And will be in indoor 1 meter scope, thereby indoor cell communication be reduced to minimum to the interference of outdoor cell to the interference of outdoor cell.
Specifically, comprise following several kinds of situation:
1, in the terminal that communicates is in the indoor cell coverage near outdoor zone (locating) like window, door, balcony etc.; And outdoor signal is (being that outdoor cell has the terminal communicating equally) under the situation preferably; The high 6dB of down transmitting power that on average receive than outdoor terminals the down transmitting power of indoor terminal the base station; Can guarantee that indoor cell is taken the sub-district as the leading factor for being in indoor terminal this moment, can not influence its communication; And the difference of 6dB can guarantee that to leak into outdoor signal be the weak jamming signal from indoor, can not exert an influence to outdoor cell.
2, in the terminal that communicates is in the indoor cell coverage near outdoor zone; And under the very weak situation of outdoor signal; The high 6dB of descending power that on average receive than outdoor terminals the descending maximum transmission power of indoor terminal the base station, therefore in the performance that guarantees the indoor cell user, it is limited leaking into outdoor signal; Learn and can the influence of disturbing be controlled in the scope of 1 meter of indoor cell according to emulation, can not cause the obvious contraction of outdoor cell service range.
3, be under the situation of the good overlay area of indoor cell at the terminal that communicates; Its down transmitting power is less naturally; Indoor cell can directly be controlled it according to existing power control algorithm (being the power control court verdict), can not form outdoor network is produced interference.
It is thus clear that this execution mode under various scenes, all can be guaranteed indoor communications the interference of outdoor cell is reached minimum.
Need to prove that above-mentioned 6dB is a concrete example, in concrete application,, can also adjust this 6dB, as being adjusted into 5dB or 7dB etc. because the scope that the indoor cell that different scene allowed is disturbed outdoor generation is different.
With two instances the effect of this execution mode is verified below.
Instance one: exist at outdoor network under the situation of signal of communication, calculate the interference of indoor communications, promptly the descending interference signal that lets out is estimated to outdoor network.
According to the power control algorithm of this execution mode, the downstream signal that indoor cell is leaked out deducts the body of wall penetration loss, and the loss on the biography ripple rule of indoor and outdoor signal, the interference signal that lets out exactly.The biography ripple rule of indoor, outdoor signal, the variation relation of promptly indoor, outdoor attenuation and distance, as shown in Figure 6.The concrete numerical value correspondence table 1 of Fig. 6.
| R(m) | L (dB, outdoor) | L (dB, indoor) |
| 0.1 | -34.21602904 | -7 |
| 1 | -44.21602904 | -37 |
| 2 | -47.226329 | -46.03089987 |
| 3 | -48.98724159 | -51.31363764 |
| 4 | -50.23662895 | -55.06179974 |
| 5 | -51.20572908 | -57.96910013 |
| 6 | -51.99754154 | -60.34453751 |
| 7 | -52.66700944 | -62.3529412 |
| 8 | -53.24692891 | -64.09269961 |
| 9 | -53.75845413 | -65.62727528 |
| 10 | -54.21602904 | -67 |
Table 1
Indoor cell is leaked the interference signal that produces can use following formula description:
Descending interference signal=P
Thr_DL-L
Penetrate-L
The space=P
Thr_DL-10-L
The space, wherein, P
Thr_DLBe the maximum downstream transmitting power of base station to indoor terminal, promptly descending interference control threshold; 10dB is general body of wall penetration loss; The L space is that signal passes the loss on the ripple rule at indoor and outdoors.
Below according to above-mentioned formula, calculate the adjust the distance interference of the outdoor cell that this indoor cell 1 meter (m) locates of communication in the indoor cell.Suppose that the terminal that communicates in this indoor cell (is in and the outdoor borderline region that links to each other) apart from domestic aerial 2m place, can find out from table 1, outdoor apart from exterior wall 1m place; The attenuation that passes on the ripple rule reaches 44.2dB, indoor distances domestic aerial 2m place, and the attenuation that passes on the ripple rule reaches 46dB; The body of wall loss is 10dB; The descending interference control threshold of indoor cell that calculates according to this execution mode is generally 15dBm, removes antenna radiation efficiency again, the communication in the indoor cell adjust the distance this indoor cell 1m place outdoor cell interference signal=15dB-29dB (antenna radiation efficiency)-46dB (indoor attenuation)-44.2dB (outdoor attenuation)-10dB (body of wall loss)=-114.2dB; It is thus clear that; Use this execution mode, exist at outdoor network under the situation of signal of communication, the indoor cell signal of communication is less to outdoor web influence.
Scene two: do not exist at outdoor network under the situation of signal, calculate the interference of indoor communications, promptly the descending interference signal that lets out is estimated to outdoor network.
Same adopt the communication in the sub-district of adjusting the distance in 1 meter sections of indoor cell of above-mentioned formula that the interference to outdoor cell is calculated: descending interference signal=P
Thr_DL-L
Penetrate-L
The spaceWherein, P
Thr_DLBe the maximum transmission power of base station, promptly equal the descending interference control threshold in this execution mode, P indoor terminal
Thr_DL=(P
RSCP)
AVG+ 6dB; The body of wall loss is similarly 10dB; Apart from 1 meter of indoor cell, according to table 1, the loss on the outdoor biography ripple rule is 44.2dB; Supposing that the terminal that communicates in the indoor cell is in apart from 2 meters of domestic aerial (is in and the outdoor borderline region that links to each other), and according to table 1, the loss on the indoor biography ripple rule is 46dB.Thereby can obtain:
Descending interference signal=(P
RSCP)
AVG+ 6dB-46dB (indoor attenuation)-44.2dB (outdoor attenuation)-10dB (body of wall loss)=(P
RSCP)
AVG-94.2dB.
Because this moment, the outdoor signal that do not exist covered, thereby the average received signal code power of neighbor cell is 0, i.e. (P
RSCP)
AVG=0.
It is thus clear that at outdoor 1M place, the interference signal of leaking output is-94.2dBm, because interference signal is less, outdoor itself do not have signal to cover, and can ignore outdoor influence.It is thus clear that, this execution mode can with to the Interference Control of outdoor cell in indoor 1 meter scope.
Because attenuation is an inequality; When there is interference in indoor base station to outdoor cell; There is interference in outdoor base station equally to indoor cell, but because generally speaking, the distance between outdoor base station and the indoor cell is greater than 10 meters; This execution mode can guarantee that indoor cell is leading sub-district, and therefore influence can be omitted.
Second embodiment of the invention relates to a kind of ascending power control method, and is as shown in Figure 7, in this execution mode, comprises data sampling equally, calculates uplink interference control thresholding and carries out three parts of uplink power control according to the thresholding that calculates.
In this execution mode, equally first, second part is referred to as training uplink interference control thresholding.The training of uplink interference control thresholding usually before system begins regular traffic is provided, as can the base station power on open after, carry out when debugging.Can this partial function be controlled for this part is provided with a switch in RNC, open this switch when needed, begin to carry out the training of uplink interference control thresholding, if switch is not opened, then uplink interference control thresholding training function is inoperative.
Below at first to first---data sampling describes.In this part, carry out the upward signal data sampling by sense terminals in this indoor cell, and sampled data is sent to the base station of indoor cell.Specifically, sense terminals can receive outdoor cell to disturb bigger position to carry out data sampling near window, door or other.The data of being sampled comprise the actual uplink transmitting power of sense terminals on the diverse location of indoor cell.
Suppose this sense terminals n actual uplink transmission power level of having sampled respectively m position:
P
TX_UE(1，1)，P
TX_UE(1，2)......P
TX_UE(1，n)
P
TX_UE(2，1)，P
TX_UE(2，2)......P
TX_UE(2，n))
……
P
TX_UE(m，1)，P
TX_UE(m，2)......P
TX_UE(m，n)
Sense terminals sends to these sampled datas the base station of indoor cell.
After obtaining sampled data, getting into second portion---uplink interference control thresholding is calculated according to the sampled data of receiving in the base station.Specifically, the average uplink transmission power of at least two locational at least two actual uplink transmitting power computing terminals that the base station reports according to sense terminals, with this average uplink transmission power as the corresponding uplink interference control thresholding in this sub-district, promptly
That is to say; The maximum uplink transmission power of indoor terminal is indoor average uplink transmission power; Because the terminal of indoor cell uses average uplink transmission power to keep proper communication with the base station; And this moment is less to the interference of outdoor cell, thereby in guaranteeing indoor cell, in the proper communication of terminal, makes indoor cell can ignore to the interference of outdoor cell.
In addition; Because the uplink interference that calculates control thresholding is independent of an indoor cell; Thresholding according to each indoor cell of the difference of concrete environment is corresponding maybe be different, make power control combining environmental fully, so that arrive the effect promoting of power control best.
After calculating uplink interference control thresholding, get into third part---according to this thresholding uplink power control is carried out at the terminal that resides in this indoor cell, specifically as shown in Figure 8.
In step 810; According to prior art; According to power control correlation measure (like the received power at SIR, terminal etc.) the power control judgement of uplink transmission power is carried out at the terminal that resides in this indoor cell, comprised in the judgement of existing open loop, closed-loop power control, inner loop power, exterior ring power any one.
In step 820, current power control court verdict is judged if current power control court verdict is for raising the uplink transmission power at this terminal, and the uplink transmission power after raising controls thresholding greater than uplink interference, then gets into step 830; Otherwise; If current power control court verdict is the uplink transmission power at this terminal of downward modulation, perhaps, the power control court verdict is for raising the uplink transmission power at this terminal; But the uplink transmission power after raising is less than or equal to uplink interference control thresholding, then gets into step 840.
In step 830, indicate this terminal that its uplink transmission power is adjusted to this uplink interference control thresholding.Thereby around indoor cell, have under the influential situation in outdoor sub-district, can the power of communications at terminal in this indoor cell be controlled at one more suitably in the scope, reduce indoor communications outdoor interference.And,, thereby under the situation that does not influence terminal communication in the sub-district, reduce interference to outdoor cell because the terminal of indoor cell uses average uplink transmission power to keep proper communication with the base station.
In step 840, according to this its uplink transmission power of terminal adjustment of this power control court verdict indication.
With an instance effect of this execution mode is verified below.
Because indoor up to leak into outdoor signal be that the actual uplink transmitting power at terminal causes, and that is to say that up the transmitting at terminal deducts coupling loss in the indoor cell, the uplink interference signal that lets out exactly.According to the power control algorithm of this execution mode, the emission maximum signal at terminal is P
Thr_UL, P rule of thumb
Thr_ULBe generally equal to 7dB, and generally speaking, outdoor cell is 133dB to the position coupling loss of indoor covering system, thereby the estimation of uplink interference signal is following:
Uplink interference signal=7dB-133dB=-126dBm;
It is thus clear that, use this execution mode to carry out uplink power control, the indoor cell uplink communication signal is less to outdoor web influence, can ignore.
Third embodiment of the invention relates to a kind of down power controlling system, and is as shown in Figure 9, comprising: computing unit, be used for downstream signal sampled data according to the neighbor cell of indoor cell, and calculate the corresponding descending interference control threshold of this indoor cell; The power control unit is used for the terminal in this indoor cell is carried out the power control judgement and the power adjustment of down transmitting power; Judging unit; Be used for power control court verdict according to this power control unit; Whether network side will be greater than this descending interference control threshold to the down transmitting power at this terminal after judging power control; If then indicate this power control unit to adjust to this descending interference control threshold to the down transmitting power at this terminal.Thereby the descending power that receive at terminal in this indoor cell is controlled at one more suitably in the scope, reduces indoor communications outdoor interference.In addition; Because the descending interference control threshold that calculates is independent of an indoor cell; Thresholding according to each indoor cell of the difference of concrete environment is corresponding maybe be different, make power control combining environmental fully, so that arrive the effect promoting of power control best.
This judging unit also is used for; At power control court verdict according to this power control unit; When confirming that this network side after the power control will be less than or equal to this descending interference control threshold to the down transmitting power at this terminal, indicate this power control unit according to the down transmitting power of this this network side of power control court verdict adjustment to this terminal.
Wherein, Sampled data is that (being influenced on the bigger position by outdoor adjacent area) sampling obtains on the position that in this indoor cell, overlaps with neighbor cell; Sampled data comprises the received signal code power of neighbor cell at least, and this computing unit comprises following subelement:
Ask average subelement, be used for calculating average received signal code power according at least one received signal code power of at least one neighbor cell; The interference control threshold computation subunit is used for this average received signal code power is added bias, obtains the corresponding descending interference control threshold of this indoor cell.The scope of this bias is 5dB to 6dB.Because the base station can exceed bias than outdoor average received signal code power to the descending power of terminal emission in the indoor cell; Even therefore outdoor neighbor cell signal is stronger; Interference to indoor cell is bigger; And the user is in and is disturbed more seriously when regional in the indoor cell, can guarantee that equally indoor communications can normally carry out; In addition; No matter whether outdoor signal is stronger; Since in the indoor cell during telex network base station only possibly exceed bias (like 5dB or 6dB) to the descending power of its emission is maximum than outdoor power; Thereby can the descending power that receive at terminal in this indoor cell be controlled at one more suitably in the scope, make indoor communications to outdoor interference in the scope of indoor nearer (as 1 meter), indoor cell communication is reduced to minimum to the interference of outdoor cell.
Four embodiment of the invention relates to a kind of uplink power control system, and is shown in figure 10, comprising: computing unit, be used for upward signal sampled data according to indoor cell, and calculate the corresponding uplink interference control thresholding of this indoor cell; The power receiving element is used to receive the actual uplink transmitting power at this terminal of terminal to report in this indoor cell; The power control unit is used for the terminal in this indoor cell is carried out the power control judgement and the power adjustment of uplink transmission power; Judging unit; The actual uplink transmitting power at this terminal that is used for receiving according to the court verdict and the power receiving element of power control unit; Whether the actual uplink transmitting power of judging this terminal after the power control will be greater than this uplink interference control thresholding, if greater than would indicate this power control unit that the actual uplink transmitting power at this terminal is adjusted to this uplink interference control thresholding.Thereby exist under the situation of outdoor adjacent area around the indoor cell, can the uplink transmission power at terminal in this indoor cell be controlled at one more suitably in the scope, reduce indoor communications outdoor interference.In addition; Because the uplink interference that calculates control thresholding is independent of an indoor cell; Thresholding according to each indoor cell of the difference of concrete environment is corresponding maybe be different, make power control combining environmental fully, so that arrive the effect promoting of power control best.
This sampled data is that (being influenced on the bigger position by outdoor adjacent area) sampling obtains on the position that in this indoor cell, overlaps with neighbor cell; This sampled data comprises terminal at least two actual uplink transmitting powers at least two diverse locations in above-mentioned zone at least; The mode that this computing unit calculates uplink interference control thresholding is: according to the average uplink transmission power of these at least two locational at least two actual uplink transmitting power computing terminals, the corresponding uplink interference control thresholding of this indoor cell equals this average uplink transmission power.Because the terminal of indoor cell uses average uplink transmission power to keep proper communication with the base station; And this moment is less to the interference of outdoor cell; Thereby in the proper communication of guaranteeing the indoor cell terminal, make indoor cell can ignore to the interference of outdoor cell.
In sum, in embodiments of the present invention,, calculate the corresponding descending interference control threshold of this indoor cell according to the downstream signal sampled data of the neighbor cell of indoor cell; Terminal in this indoor cell is carried out the power control judgement of down transmitting power; If network side will be greater than this descending interference control threshold to the down transmitting power at this terminal after confirming power control according to the power control court verdict; Then do not carry out the power adjustment, and will adjust to this descending interference control threshold the down transmitting power at this terminal according to court verdict.Thereby exist under the situation of outdoor adjacent area around the indoor cell, can the descending power that receive at terminal in this indoor cell be controlled at one more suitably in the scope, reduce indoor communications outdoor interference.In addition; Because the descending interference control threshold that calculates is independent of an indoor cell; Thresholding according to each indoor cell of the difference of concrete environment is corresponding maybe be different, make power control combining environmental fully, so that arrive the effect promoting of power control best.
According to the upward signal sampled data of indoor cell, calculate the corresponding uplink interference control thresholding of this indoor cell; By its actual uplink transmission power of terminal to report in the indoor cell; After the power control judgement of the terminal in the indoor cell being carried out uplink transmission power; If confirm that according to the power control court verdict actual uplink transmitting power at this terminal after the power control will be greater than this uplink interference control thresholding; Then do not carry out the power adjustment, and the actual uplink transmitting power at this terminal is adjusted to this uplink interference control thresholding according to court verdict.Thereby exist under the situation of outdoor adjacent area around the indoor cell, can the uplink transmission power at terminal in this indoor cell be controlled at one more suitably in the scope, reduce indoor communications outdoor interference.In addition; Because the uplink interference that calculates control thresholding is independent of an indoor cell; Thresholding according to each indoor cell of the difference of concrete environment is corresponding maybe be different, make power control combining environmental fully, so that arrive the effect promoting of power control best.
Can in indoor cell, receive outdoor signal disturbs stronger position to carry out the signal data sampling; With the up and/or descending interference control threshold of guaranteeing to calculate, can be applicable to the terminal that is in signal good area in the indoor cell simultaneously and be in the terminal that signal disturbs big zone.
Descending interference control threshold equals: the average received signal code power of at least one received signal code power of each neighbor cell adds bias, and this bias can rule of thumb obtain or obtain according to anti-true result, can be 6dB.Because the base station can exceed bias than outdoor average received signal code power to the descending power of terminal emission in the indoor cell; Even therefore outdoor neighbor cell signal is stronger; Interference to indoor cell is bigger; And the user is in and is disturbed more seriously when regional in the indoor cell, can guarantee that equally indoor communications can normally carry out; In addition; No matter whether outdoor signal is stronger; Since in the indoor cell during telex network base station only possibly exceed bias (like 5dB or 6dB) to the descending power of its emission is maximum than outdoor power, thereby can the descending power that receive at terminal in this indoor cell be controlled at one more suitably in the scope, rule of thumb or emulation can confirm; This moment, indoor communications in the scope of indoor nearer (as 1 meter), made indoor cell communication reduce to minimum to the interference of outdoor cell to outdoor interference.
Uplink interference control thresholding equals the average uplink transmission power of each sampling location; The maximum uplink transmission power that is indoor terminal is indoor average uplink transmission power; Because the terminal of indoor cell uses average uplink transmission power to keep proper communication with the base station; And this moment is less to the interference of outdoor cell, thereby in guaranteeing indoor cell, in the proper communication at terminal, makes indoor cell can ignore to the influence of outdoor cell.
Though through with reference to some preferred implementation of the present invention, the present invention is illustrated and describes, those of ordinary skill in the art should be bright, can do various changes to it in form with on the details, and without departing from the spirit and scope of the present invention.
Claims (5)
1. an ascending power control method is characterized in that, may further comprise the steps:
Upward signal sampled data according to indoor cell; Calculate the corresponding uplink interference control thresholding of this indoor cell; Said sampled data comprises locational at least two the actual uplink transmitting powers of at least two of said indoor cell; Said calculating uplink interference control thresholding specifically comprises; The base station is controlled thresholding with said average uplink transmission power as the corresponding uplink interference in said sub-district according to the average uplink transmission power of said at least two locational at least two actual uplink transmitting power computing terminals;
Receive the actual uplink transmitting power at this terminal of terminal to report in the said indoor cell;
The terminal in the said indoor cell is carried out the power control judgement of uplink transmission power according to the power control correlation measure; If the actual uplink transmitting power of confirming said terminal after the power control according to the power control court verdict is then adjusted to this uplink interference control thresholding with the actual uplink transmitting power at this terminal greater than said uplink interference control thresholding.
2. ascending power control method according to claim 1; It is characterized in that; If confirm that according to said power control court verdict the actual uplink transmitting power at said terminal is less than or equal to said uplink interference control thresholding after the power control, then according to the uplink transmission power at this this terminal of power control court verdict adjustment.
3. ascending power control method according to claim 1 is characterized in that, said sampled data in said indoor cell, overlaps with neighbor cell or the position adjacent up-sampling obtains;
It is one of following that said position comprises at least: in the preset range of indoor cell doorway, in the indoor cell window preset range.
4. a uplink power control system is characterized in that, comprising:
Computing unit; Be used for upward signal sampled data according to indoor cell; Calculate the corresponding uplink interference control thresholding of this indoor cell; Said sampled data comprises locational at least two the actual uplink transmitting powers of at least two of said indoor cell; The mode that said computing unit calculates uplink interference control thresholding is: according to said at least two locational at least two actual uplink transmitting powers, and the average uplink transmission power of computing terminal, the corresponding uplink interference control thresholding of said indoor cell equals this average uplink transmission power;
The power receiving element is used to receive the actual uplink transmitting power at this terminal of terminal to report in the said indoor cell;
The power control unit is used for according to the power control correlation measure terminal in the said indoor cell being carried out the power control judgement and the power adjustment of uplink transmission power;
Judging unit; The actual uplink transmitting power at the said terminal that is used for receiving according to the court verdict and the said power receiving element of said power control unit; Whether the actual uplink transmitting power of judging said terminal after the power control greater than said uplink interference control thresholding, if greater than would indicate said power control unit that the actual uplink transmitting power at this terminal is adjusted to this uplink interference control thresholding.
5. uplink power control according to claim 4 system is characterized in that, said sampled data in said indoor cell, overlaps with neighbor cell or the position adjacent up-sampling obtains.
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| CNA2007100434195A Division CN101079659A (en) | 2007-07-04 | 2007-07-04 | Control method and system for uplink and downlink power |
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| CN102868458B (en) * | 2011-07-06 | 2015-08-19 | 上海华为技术有限公司 | The interference detection method of wireless telecommunications system and wireless telecommunications system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1126930A (en) * | 1994-05-12 | 1996-07-17 | Ntt移动通信网株式会社 | A transmission power control method and a communication system using the same |
| EP0893890A2 (en) * | 1997-07-22 | 1999-01-27 | Nec Corporation | CDMA Transceiver and transmission power control in mobile communication systems |
| CN1466819A (en) * | 2001-08-01 | 2004-01-07 | ������������ʽ���� | Portable radio telephone set |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126930A (en) * | 1994-05-12 | 1996-07-17 | Ntt移动通信网株式会社 | A transmission power control method and a communication system using the same |
| EP0893890A2 (en) * | 1997-07-22 | 1999-01-27 | Nec Corporation | CDMA Transceiver and transmission power control in mobile communication systems |
| CN1466819A (en) * | 2001-08-01 | 2004-01-07 | ������������ʽ���� | Portable radio telephone set |
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