CN100365949C - Method for implementing downlink power control in mobile communication system having intelligent antenna - Google Patents
Method for implementing downlink power control in mobile communication system having intelligent antenna Download PDFInfo
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- CN100365949C CN100365949C CNB2004100423125A CN200410042312A CN100365949C CN 100365949 C CN100365949 C CN 100365949C CN B2004100423125 A CNB2004100423125 A CN B2004100423125A CN 200410042312 A CN200410042312 A CN 200410042312A CN 100365949 C CN100365949 C CN 100365949C
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Abstract
The present invention relates to a method for realizing down power control in a mobile communication system with an intelligent antenna. The process of the present invention regulates the down power of a base station in the communication process comprises that parameters about communication quality in measuring report are checked, when the parameters do not meet the requirements, whether the down power can be increased is judged. The judging process comprises that the down power is increased, when only the terminal works in time slot that the terminal work of the down power is required to increase, when the base station has excess power, and the down power of the terminal which is increased can not interfere with adjacent terminals; when the time slot has multiple terminals, the terminal which requires to increase the down power is determined as a terminal of a first rank, and other terminals of each level which are disturbed when the down power of the terminal of the first rank is increased are determined according to the predetermined number of the rank, so when the base station has the excess power, and the down power of the terminals of each rank which is increased can not interfere the adjacent terminals, down transmitting power can be judged to increase, and simultaneously the terminals of each rank increase the down power according to the predetermined rank power increments.
Description
Technical field
The present invention relates to the descending power control technology in the cell mobile communication systems, relate to or rather a kind of in having the mobile communication system of smart antenna, the method for carrying out descending power control.
Background technology
From adopting the second generation mobile communication system of code division multiple access (CDMA) technology (IS-95 standard), just used power control techniques to improve power system capacity, but its power control is only controlled to the ascending power of base station user terminal, does not comprise the base station is controlled to the descending power of user terminal emission.
In order to optimize RRM, particularly, in the 3G (Third Generation) Moblie standard, begin to adopt the descending power control technology for the quality of guarantee information transmission, the control base station is to the terminal emitted power.As 3-G (Generation Three mobile communication system) 3GPP correlation standard, can use descending power to control the quality of improving from the base station to the terminal communication, comprise the method that adopts open loop, closed loop and exterior ring power control.
Open-loop power control method wherein is by the transmission rate of base station according to the network planning and downlink business, pre-determines down transmitting power, and launch terminal according to the down transmitting power of determining the base station.
Close-loop power controlling method wherein is in communication process, and terminal comes the requirement base station to increase or the reduction down transmitting power according to the downlink signal quality that receives and by upward signal.When promptly the signal quality that receives when terminal is better than needed value, allow the base station reduce the down transmitting power of shared code channel; And when the terminal received signal quality does not reach needed value, allow the base station increase the down transmitting power of shared code channel.
Outer-loop power controlling method wherein is to determine target signal to noise ratio (SIR) value by system according to the quality of the terminal quality of reception, again by system according to cell capacity and disturbed condition, determine to increase the limit of down transmitting power.
Usually, mobile communication system uses above-mentioned method for controlling downlink power can obtain reasonable effect under the lower situation of system loading, but when system loading is heavier, just is difficult to reach control by power improved the effect of power system capacity.This is because mobile communication system must provide different business to a plurality of users simultaneously, and cdma system is an interference-limited system, when its system loading is heavier, the ratio of the received signal of each user and interference is all near the limit that allows to reach, all will to other user produce interference when again any one terminal use being increased down transmitting power this moment, and other users' the quality of reception is worsened.
Fig. 1 illustrates the mobile communication system structure and the transmission of wireless signals process thereof of a simplification.System by n base station 101,102 ...., 10n forms, in the sub-district that base station 101 covers, have m terminal 201,202,203 ..., 20m, wherein terminal 201,202, and 203 communicate by letter and use same carrier frequencies simultaneously with base station 101.The downstream rate of supposing terminal 201 is higher, and (as message transmission rate is 384kbps, and the error rate of requirement is 10 to need high transmission quality
-6), and terminal 202 and 203 is only conversed (message transmission rate only is 12.2kbps), and the then above-mentioned down transmitting power level to terminal 201 that sets when the open loop descending power is controlled will be compared the high about 18dB of down transmitting power level of terminal 202 and 203.In communication process, if the edge of terminal 201 101 coverage cell towards the base station moves, terminal 201 is far away apart from base station 101, the radio wave propagation decline is big, and terminal 202 and 203 101 moves towards the base station, terminal 202 and 203 nearer apart from base station 101, for example, base station 101 to the radio wave fading of 202,203 at terminal has been distinguished little 10dB and 20dB than base station 101 to the radio wave fading of 201 at terminal.Be the guarantee information transmission quality, will use the control of closed loop descending power.Iff considering that the signal level that each terminal receives need meet the demands, the transmitting power that terminal 201 will constantly require base station 101 to increase it, and terminal 202 and 203 will constantly require base station 101 to reduce transmitting power to them.But, increase down transmitting power to terminal 201 and just must increase interference terminal 202 and 203.Though terminal 202,203 is closer apart from base station 101, because incoming level than higher, increases along with disturbing, the deterioration of the quality of reception, also can require to increase down transmitting power conversely, formed " the cocktail effect " that when the river rises the boat goes up.Like this, whole base station will increase the down transmitting power to all terminals simultaneously, to guarantee system stability work.If do not consider the fact of total transmit power limited of base station, only increase down transmitting power, also will increase interference greatly to neighbor cell, reduce the capacity of whole system.Certainly, outer-loop power controlling method can be controlled this process, promptly refuses 201 pairs of requirements that increase down transmitting power of terminal, then makes communication quality can not get guaranteeing.Like this, the effect of descending power control is just the same with the effect of directly distributing power by the spread spectrum coefficient and the service quality of each code channel, does not bring into play the effect of descending power control in other words.
In the mobile communication system of applying intelligent antenna, generally be that smart antenna array is equipped on the wireless base station, this antenna array can transmit and receive signal with following two kinds of shaped-beams: a kind of is the shaped-beam of fixing, and another kind is dynamic shaped-beam.Fixing shaped-beam, as adopt omnidirectional, band shape or fan anteena battle array, this wave beam forming mode is mainly used in the omnidirectional's information that sends, for example broadcasting or paging information etc., with the covering of fixing shaped-beam realization to the sub-district, its down transmitting power is to set according to the network planning in advance, can not carry out descending power control.Dynamic shaped-beam is mainly used in and follows the tracks of the user, send information to specific user, as send user's data, signaling etc. to, therefore in the system that adopts dynamic shaped-beam, only limit to link that the specific user communicates by letter on use descending power control.But traditional method for controlling downlink power, no matter be, if do not consider especially or adopt special method, as long as user terminal claims to the fixed beam figuration or to the dynamic beam figuration, the base station all will cause " cocktail effect " inevitably with regard to corresponding increase descending power.
For the cell mobile communication systems that uses intelligent antenna technology, such as Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, its descending power control should be able to reach following target: when a terminal is realized descending power control, interference effect to other-end should be reduced to very low, in the communication quality of guaranteeing this enforcement descending power control link, be unlikely to damage the quality of other communication links.Only in this way, just can fully reach the advantage of descending power control: improve the sub-district and cover, guarantee communication quality and increase power system capacity etc.
Summary of the invention
The present invention provides a kind of method that realizes descending power control in having the mobile communication system of smart antenna.Having under the condition of intelligent antenna beam shaping, how to carry out descending power control, improving the performance of mobile communication system on the one hand, unlikely again on the other hand cause " cocktail effect ".
Descending power control of the present invention is carried out other users' interference in conjunction with estimation and this user to customer location, use in having the mobile communication system of smart antenna because be, adopted the wave beam forming technology, just can the estimating user position and estimate the interference of this user to other users, thereby realization the inventive method reaches the effect that descending power is controlled to greatest extent.
The technical scheme that realizes the object of the invention is such: a kind of method that realizes descending power control in having the mobile communication system of smart antenna, when being included in terminal access, link establishment, the process of system configuration base station down transmitting power, with in communication process, system is characterized in that according to the process of the measurement report adjustment base station down transmitting power of base station and terminal to report the process of described adjustment base station down transmitting power comprises:
A. in the check measurement report about the parameter of communication quality, when communication quality parameter meets the demands, the down transmitting power at uncomfortable integral basis station or reduce down transmitting power by the step-length of setting, when communication quality parameter does not meet the demands, be defined as demanding terminal and increase down transmitting power, execution in step B;
B. judging to increase down transmitting power, comprising:
B1. at first judge in requiring to increase the time slot of down transmitting power terminal works, whether to have only this terminal in work, when having only this terminal in work, have in the base station under the situation of dump power, by the down transmitting power of default step-length increase to this terminal, return steps A,, then return steps A if the base station does not have dump power, as other-end in when work, execution in step B2;
B2. this terminal is defined as the first estate terminal, and by predetermined number of degrees determine can be disturbed when increasing the down transmitting power of the first estate terminal other each grade terminals below the first estate, with each grade terminal judges for can increase down transmitting power, and execution in step C;
When C. dump power being arranged, simultaneously each grade terminal is increased down transmitting power by default grade power increment respectively in the base station.
The execution of described steps A specifically comprises:
A1. the bLock error rate BLER of systems inspection terminal received signal;
A2. equal its set point as bLock error rate BLER, perhaps the bLock error rate BLER absolute value value within predetermined Δ time that is lower than the difference between its set point and its set point and the bLock error rate BLER is not done any adjustment;
When A3. the absolute value that is lower than the difference between its set point and its set point and the bLock error rate BLER as bLock error rate BLER is greater than predetermined Δ, then by the predetermined long step by step down transmitting power that reduces this terminal;
A4. when bLock error rate BLER is higher than its set point, check the ratio Eb/I of received signal level Rx and received signal and interference;
A5. the ratio Eb/I that equals its set point and received signal and interference as received signal level Rx equals its set point, does not do any adjustment; Perhaps, received signal level Rx is higher than the absolute value of difference of its set point and received signal level Rx and its set point within predetermined value, and the absolute value of difference that the ratio Eb/I of received signal and interference is higher than the ratio Eb/I of its set point and received signal and interference and its set point is not done any adjustment within predetermined value;
A6. be higher than the absolute value of difference of its set point and received signal level Rx and its set point greater than predetermined value as received signal level Rx, and the absolute value of the ratio Eb/I of received signal and the interferences ratio Eb/I that is higher than its set point and received signal and interferences and the difference of its set point is during greater than predetermined value, then by the down transmitting power of this terminal of the reduction of length step by step of being scheduled to;
A7. be lower than its set point as received signal level Rx, or the ratio Eb/I of received signal and interference carries out described step B when being lower than its set point.
The execution of described step B2, specifically comprise: begin to investigate from the first estate terminal, in the downlink forming beamwidth of the current grade terminal of being investigated, whether check has the other-end of working simultaneously and not being taken into account, during the other-end of not working simultaneously, then direct execution in step C, have and work simultaneously and investigated when interior other-end, these other-ends are defined as current next grade terminal of being investigated the grade terminal, with the current grade terminal that this next grade terminal is investigated as quilt, repeat this process and when reaching predetermined number of degrees, stop, and execution in step C.
Also comprise step B3 between described step B2 and step C: can not disturb the adjacent cell terminal when judging the down transmitting power that increases each grade terminal, being judged as in the time of can not disturbing the adjacent cell terminal to increase down transmitting power, otherwise restriction increases down transmitting power.
Whether can disturb the adjacent cell terminal when described judgement increases down transmitting power, specifically comprise:
Timing Advance TA value according to the terminal emission that provides in the measurement report, estimate the distance between this terminal and base station, when judging that according to distance terminal is in the edge of sub-district and limits its maximum downstream transmitting power, the adjacent cell terminal can be disturbed when then being defined as increasing the down transmitting power to this terminal, otherwise the adjacent cell terminal can not be disturbed when being defined as increasing down transmitting power to this terminal.
Described step C, when the first estate terminal is increased down transmitting power Δ P, to each the grade terminal below the first estate terminal, the down transmitting power/adjacent rank power increment that increases by last grade terminal increases the down transmitting power of next grade terminal.
By adopting method of the present invention, can in the mobile communication system of using smart antenna, realize descending power control.This method comprises power configuration and two processes of power control, and when terminal access, link establishment, system is according to downlink transfer rate configuration base station down transmitting power; In communication process, system adjusts down transmitting power according to the measurement result of terminal and base station report, to guarantee communication quality.In power control process, when communication quality descends, used decision-making system whether should increase the method for down transmitting power especially, the method is taken all factors into consideration the signal and the ratio of interference, terminal reaches other-end in the downlink forming wave beam that is pointing to terminal from the distance of base station situation that terminal receives, make when a terminal is increased down transmitting power, reduce interference as far as possible other-end.
The beneficial effect of the inventive method is: the advantage that has made full use of smart antenna, can be when realizing descending power control with its to this sub-district and adjacent cell in the interference of other-end be reduced to minimum, give full play to the effect of descending power control, and can realize descending power control with very simple control procedure and algorithm to the assurance quality of service.
Method of the present invention not only can directly be used in the TD-SCDMA system, also can be used in other wireless communication systems after suitably revising.
Description of drawings
Fig. 1 is mobile communication system structure and the transmission of wireless signals process schematic diagram of simplifying;
Fig. 2 is cell mobile communication systems structure and the transmission of wireless signals process schematic diagram with smart antenna;
Fig. 3 is the mobile telecommunication system down power control process FB(flow block) with smart antenna;
Fig. 4 judges the deterministic process FB(flow block) that could increase down transmitting power among Fig. 3.
Embodiment
Fig. 2 is to use the mobile communication system structure diagram of smart antenna.System provides a shaped-beam to aim at this terminal for the terminal (having distributed code channel) of each activation.In figure, base station 101 is used the downlink wave beam 301,302 and 303 emissions of figuration respectively to terminal 201,202 and 203.With regard to downlink transfer, base station 101 will mainly concentrate in each corresponding wave beam the transmitting power of each terminal, mainly concentrate in the shaped-beam 301 as the transmitting power of the 101 pairs of terminals 201 in base station.In such mobile communication system, then need to adopt the method for controlling downlink power inequality with preceding method.
Method for controlling downlink power of the present invention comprises power division and two processes of power control, power division process wherein and aforesaid open loop method for controlling downlink power are basic identical, can be summarized as: when terminal access, link establishment, the system configuration base station down transmitting power, this configuration comprises: the maximum transmission power Preq of the every carrier wave of line every day the when down transmitting power on the downward guide time slot DwPTS equals the sub-district design; The transmitting power of the every carrier wave of descending line every day on the time slot of all theaomni-directional transmission and the code channel is used fixing down transmitting power Preq/n, and n is the shared code channel number of all code channels in omnidirectional's time slot; The business of launching in all directed time slots and the down transmitting power of signaling code channel equal m * Preq/k, and m is that k is maximum spread spectrum coefficient for equivalence that its business is distributed is the shared code channel number of the maximum spread spectrum coefficient of system.The inventive method is mainly reflected in the power control process.
This descending power control is realized by system fully, terminal and base station only periodically or by the Event triggered mode to its reception situation of System Reports, except that the report parameter relevant (as the bLock error rate when of incoming level, signal and interference etc.) with the reception situation, distance and orientation between the current and base station of also necessary reporting terminal.Distance between terminal and base station can obtain by the measurement to uplink synchronous Timing Advance (TA:Timing Advance) (in order to guarantee to arrive the base station simultaneously apart from the transmitting of terminal of the different distances in base station, need to adjust the x time of different terminals, should get greatly apart from its time lead of terminal that the base station is far away, the terminal near apart from the base station, its time lead should be obtained littler), the orientation then can obtain by the arrival bearing (DOA) that intelligent antenna beam shaping obtained.To any terminal, if its reception is better than needed situation, then system will require the down transmitting power of base station reduction to this terminal.And when the reception of terminal can not be satisfied the demand, system will be according to the signal receiving quality of this terminal and position, whether the situation and the base station of other terminals of working also has unnecessary power or the like factor to determine whether carrying out descending power control in the wave beam of aiming at this terminal, promptly increase down transmitting power, perhaps guarantee communication quality with additive method to this terminal.
Whether the decision of more than enumerating carries out one of detailed distinguishing rule of descending power control is differentiation to terminal quality: if the ratio of the received signal of terminal and interferences reaches the value of system's regulation but reception bLock error rate (quality of reception) does not reach requirement, illustrate that then this terminal received signal quality has problem, system will likening to whether carrying out the foundation that descending power is controlled with the signal that receives and interferences.
The decision of more than enumerating whether carry out descending power control detailed distinguishing rule two be to the differentiation of terminal from base station distance: if terminal has been in cell edge, and the down transmitting power of this terminal has been reached the maximum of network settings, then can not increase transmitting power again, in order to avoid increase interference to adjacent cell.
The decision of more than enumerating whether carry out descending power control detailed distinguishing rule three be to differentiate the orientation of terminal with respect to the base station: requiring the base station to increase in the beamwidth (as the 3dB width) of terminal of down transmitting power, check in this sub-district and its while, all terminals with carrier wave work, again according to the wave beam forming direction of these terminals, these terminals are divided into grade, according to the grade of each terminal with increase the down transmitting power of these terminals simultaneously by the increment corresponding with grade, should be to the down transmitting power that the high terminal of grade increases greater than the down transmitting power that the low terminal of grade is increased, graduation is increased in the down transmitting power of the terminal that may be interfered in these beam directions, disturb other-end to avoid owing to only a terminal is increased down transmitting power, simultaneously these terminals are all increased down transmitting power, just the power magnitude that increases is different.
The decision of more than enumerating whether carry out descending power control detailed distinguishing rule four are differentiations to the base station power capacity: when the total transmitting power in base station has been finished using, just can not increase down transmitting power again, otherwise will make the power amplifier of base station transceiver be operated in the inelastic region.
As an example, at the TD-SCDMA mobile communication system, descending power control procedure of the present invention is described, flow process is as shown in Figure 3.
The TD-SCDMA mobile communication system is the tdd systems of a multi-slot, and it has used intelligent antenna technology.If the maximum transmission power of the every carrier wave of its base station line every day is Pmax, and to design the maximum transmission power of the every carrier wave of desired line every day be Preq in the sub-district.Then Preq should be no more than but allow near Pmax, could both satisfy system requirements, and is the most economical again.
Step 131, the layoutprocedure of the base station down transmitting power when carrying out terminal access, link establishment is that its distribution principle is according to downlink business configurating base station down transmitting power:
Down transmitting power on downward guide time slot DwPTS should equal Preq; On the time slot and code channel of all theaomni-directional transmission, as broadcast the transmitting power of the every carrier wave of descending line every day on code channel (BCH), paging code channel (PCH) and the omnidirectional's forward direction code channel (FACH), spread spectrum coefficient according to shared code channel number and use uses fixing transmitting power Preq/n, n is the shared code channel number of all code channels in omnidirectional's time slot in the formula, typical case is that maximum spread spectrum coefficient is 16, take two code channels, fixing transmitting power can be chosen as Preq/2; The business of emission (wave beam forming) and the down transmitting power of signaling code channel should equal m * Preq/k in all directed time slots, wherein, m is a code channel number shared when being maximum spread spectrum coefficient for equivalence that its business is distributed, and k is maximum spread spectrum coefficient, enters following power control process then.
Step 132, terminal and base station set up communicate by letter after, terminal and base station will be periodically or with the incident triggering mode to radio network controller (RNC) reporting measurement reports, come the reporting measurement result with measurement report, comprising: terminal with respect to the orientation (DOA) of base station, terminal from ratio (Eb/I) of the bLock error rate (BLER) of the received signal level (Rx) of distance (can obtain), the terminal of base station, terminal received signal, signal that terminal receives and interference or the like by TA.
Step 133 in 3-G (Generation Three mobile communication system), guarantees that communication quality is topmost requirement, thereby system is the parameter of checkmark communication quality at first: the bLock error rate of terminal received signal (BLER) will produce three kinds of solutions according to check result:
First kind of solution promptly returned step 132, when the bLock error rate parameter of tag communications quality equals or slightly is lower than set point (a little less than implication is difference between set point and the bLock error rate within predetermined Δ herein), then do not do any adjustment, continue the measurement result that monitoring terminal and base station report.
Second kind of solution is execution in step 137, when the bLock error rate parameter of tag communications quality during (far below implication is that difference between set point and the bLock error rate is greater than predetermined Δ) herein far below set point, the bLock error rate (BLER) that is the signal that receives of terminal is lower one more than the magnitude than desired, then press the down transmitting power that long step by step (long step by step for example 1dB or other step-lengths) reduces this terminal links, return step 132 again, continue the measurement result that monitoring terminal and base station report.
The third solution is an execution in step 134, when the bLock error rate parameter of tag communications quality is higher than set point, the bLock error rate (BLER) that is the signal that receives of terminal is than desired value height, communication quality can not meet the demands, be that system need carry out descending power control, before carrying out descending power control, also must check the ratio (Eb/I) of received signal level (Rx) and received signal and interference.Also will produce three kinds of solutions according to check result:
First kind of solution promptly returned step 132, (implication that herein slightly is higher than is Rx set point and actual received signal level when the ratio (Eb/I) of received signal level (Rx) and received signal and interference equals or slightly be higher than separately set point, difference (absolute value) between the Eb/I of signal-to-noise ratio settings value and reality is all within predetermined value), bLock error rate (BLER) situation higher of the signal that receives of the terminal of aforementioned appearance then than set point, it may be the error code that other reasons causes, for example terminal quality is bad, at this moment, can not increase descending power, then continue the measurement result that monitoring terminal and base station report;
Second kind of solution is execution in step 137, when ratio (Eb/I) parameter of received signal level (Rx) and received signal and interference during (far above implication is that difference between Rx set point and actual received signal level, signal-to-noise ratio settings value and the Eb/I that reports is greater than predetermined value) herein far above separately set point, then press the down transmitting power that long step by step (long step by step for example 1dB or other step-lengths) reduces this terminal links, return step 132 again, continue the measurement result that monitoring terminal and base station report;
The third solution is an execution in step 135, when ratio (Eb/I) parameter of received signal level (Rx) or received signal and interference is lower than separately set point, communication quality can not meet the demands, and promptly system carries out the deterministic process that could increase down transmitting power.
When the ratio (Eb/I) of received signal level (Rx) or received signal and interference does not reach separately set point, then may improve communication quality (step 136) by increasing down transmitting power, use descending power control in decision, when guaranteeing communication quality by increasing down transmitting power to terminal, must carry out to increase judgement by the process of Fig. 4 to its down transmitting power, judged result for can increase the time then execution in step 136 return step 132 then, otherwise do not adjust, directly return step 132 and carry out, continue the measurement result that monitoring terminal and base station report.
Referring to Fig. 4, be the deterministic process that could increase down transmitting power of step 135 and 136 and the idiographic flow that increases down transmitting power.
In the TD-SCDMA system, used intelligent antenna technology, downlink is carried out wave beam forming, the power of wave beam behind the figuration on the different azimuth angle can there are differences, (being the orientation of terminal) power is the strongest on wave beam principal direction, the big more place of angle of departing from this wave beam principal direction, then power is more little, therefore usually half-power point is defined beamwidth as the border of shaped-beam and with this, and the direction outside half-power point, because power descends greater than half-power, then can think to be in outside the shaped-beam.It is that half-power, width are the shaped-beam (Θ is the angle between half-power point and the wave beam principal direction) of 2 Θ that a size all will be launched to the terminal of each activation in the base station.In addition, because the TD-SCDMA system is the tdd systems (referring to 3GPP standard TS25.221) of a multi-slot, maximum spread spectrum coefficient is 16 in each time slot, promptly has 16 code channels to use at most, have 16 terminals can be simultaneously, with carrier wave work.Above-mentioned two characteristics can make descending power control of the present invention become simple and effective.And to the downlink transfer of high-speed data, for example data rate reaches 128kbps when above, each time slot has only a terminal in work, and it is carried out power control (increase down transmitting power) has not just needed to consider to the interference of this sub-district or neighbor cell other-end.
In view of the above, use descending power control promptly to determine whether and to guarantee transmission quality by increasing down transmitting power in the system.When determining that by Fig. 3 step communication quality does not meet the demands needs increase down transmitting power, press Fig. 4 step and carry out.
Judge that at first (certain terminal is when the quality of reception is bad for various reasons in this terminal to be adjusted, can report and require the base station to increase down transmitting power it) whether have only this terminal in work (step 141) in the time slot of work, if, check further then whether the base station has dump power (step 141), when there is dump power the base station, judge again when the down transmitting power that increases this terminal and whether can seriously disturb adjacent cell (step 143), if the base station also can not produce serious the interference to adjacent cell when dump power being arranged and increasing its down transmitting power, then by the down transmitting power of long step by step size increase to this terminal, long step by step as 1dB or 3dB (step 144), return the step 132 among Fig. 3 then, continue the reporting measurement result of monitoring terminal, though when the down transmitting power that increases this terminal, can seriously not disturb adjacent cell if the base station has dump power or base station that dump power is arranged, then refusal increases the down transmitting power of this terminal, return the step 132 among Fig. 3, continue the reporting measurement result of monitoring terminal.
If in requiring to adjust the time slot of terminal works, worked many terminal (steps 141 simultaneously, can there be 16 terminals to work simultaneously at most), then check at this and require to adjust terminal (current investigation grade terminal, it is the first estate terminal, initial value is that zero counter adds 1) (width is the shaped-beam of 2 Θ to the downlink forming wave beam, promptly descending arrival direction DOA ± Θ) in the orientation whether the other-end (step 145) of working is simultaneously arranged.If no, have only the flow process (step 142,143,144) of a terminal in this time slot in work with carrying out; If in this terminal downlink forming wave beam orientation, the other-end of working is simultaneously arranged, then needing with these terminals is the second grade terminal (current investigation grade terminal, counter adds 1 again), in the downlink forming wave beam orientation of each second grade terminal of investigation whether the tertiary gradient terminal that is not taken into account is arranged again, by that analogy, when reaching default number of degrees, counter stops to investigate and with counter O reset, thereby obtain the terminal of each grade, promptly obtain may be disturbed when requiring to adjust terminal and increase down transmitting power all terminals and their grade (step 146).
Check earlier whether the base station has dump power (147), there is dump power then further to judge and whether can seriously disturbs adjacent cell (148) above-mentioned each grade terminal increase down transmitting power, if dump power is arranged and when the down transmitting power that increases each terminal, can't produce serious the interference to adjacent cell, then simultaneously by increasing the down transmitting power (149) of each terminal with the corresponding grade point of the grade of these terminals, return the step 132 among Fig. 3 then, continue the reporting measurement result of monitoring terminal, though when the down transmitting power that increases certain terminal, can seriously not disturb adjacent cell if the base station has dump power or base station that dump power is arranged, then refusal increases the down transmitting power of this terminal, return the step 132 among Fig. 3, continue the reporting measurement result of monitoring terminal.
By the process with the corresponding grade point increase of the grade of these terminals down transmitting power is (for example only to consider Three Estate, the adjacent rank power increment is 2, when the first estate terminal is increased down transmitting power Δ P, to each the grade terminal below the first estate terminal, the down transmitting power/adjacent rank power increment that increases by last grade terminal increases the down transmitting power of next grade terminal).
Having determined to increase down transmitting power Δ P to the terminal A of the first estate, and counter adds 1, considers this moment to suppose to have the second grade terminal B1, B2, B3 to other users that working in the down beam shaping width of A, and counter adds 1 again; Continue to investigate the second grade terminal B1, B2, B3 then, respectively in their wave beam forming width separately, whether also have other terminals that are not taken into account, supposing has tertiary gradient terminal C1 and C2 in the wave beam forming width of the second grade terminal B1, counter adds 1 again, and the terminal that has not had other not take into account in the wave beam forming width of the second grade terminal B2 and B3.At this moment, be Δ P/2 to the power recruitment of the second grade terminal B1, B2, B3, be Δ P/4 to the power recruitment of tertiary gradient terminal C1 and C2.System will allow the base station that the down transmitting power of the first estate terminal A is increased Δ P simultaneously, to the down transmitting power increase Δ P/2 of the second grade terminal B1, B2, B3, to the down transmitting power increase Δ P/4 of tertiary gradient terminal C1, C2.Because system only considers the terminal of Three Estate, be counter counted full 3 stop to investigate, counter O reset, even also have other terminals that are not taken into account in the wave beam forming width of tertiary gradient terminal C1 or C2, system does not increase their down transmitting power yet.
Whether above-mentioned inspection causes serious interference to adjacent cell, checks exactly whether each terminal that is about to be increased down transmitting power is in the edge of this sub-district and limits its maximum downstream transmitting power.In the measurement result of aforementioned acquisition, the measurement result (according to the TA value, i.e. the Timing Advance of terminal emission) of terminal and base station distance is arranged.If this distance surpasses more than 80% of this radius of society, this terminal may enter Zone switched, may cause interference to adjacent cell if increase considerably to its down transmitting power again.At this moment, must restriction to its maximum downstream transmitting power, as inserting in terminal, adding value, for example a 3dB on the power basis of system configuration during link establishment.When each terminal that is about to be increased down transmitting power be in this sub-district inner and apart from the base station be no more than this radius of society 80% the time, increase its down transmitting power and then can seriously not disturb adjacent cell.
Method of the present invention realizes descending power control in the mobile communication system of using smart antenna, when terminal access, link establishment, system is according to downlink transfer rate configuration base station down Initial Trans; In communication process, system adjusts down transmitting power according to the measurement result of terminal and base station report, to guarantee communication quality.But before descending at communication quality, needing to increase down transmitting power, need to judge whether the base station can increase down transmitting power earlier, this judgement is to carry out from the distance of base station and the operating state of pointing to other-end in the downlink forming beamwidth of terminal according to terminal, make when terminal is increased down transmitting power, the interference of adjacent cell terminal is reduced as far as possible.
The present invention has made full use of the advantage of smart antenna, can be when realizing descending power control to this sub-district and adjacent cell in the interference of other-end be reduced to minimumly, give full play to descending power control to guaranteeing the effect of quality of service.
Method of the present invention not only can be used in the TD-SCDMA system, also can be used in other wireless communication systems.
Claims (10)
1. in having the mobile communication system of smart antenna, realize the method that descending power is controlled for one kind, when being included in terminal access, link establishment, the process of system configuration base station down transmitting power, with in communication process, system is characterized in that according to the process of the measurement report adjustment base station down transmitting power of base station and terminal to report the process of described adjustment base station down transmitting power comprises:
A. in the check measurement report about the parameter of communication quality, when communication quality parameter meets the demands, the down transmitting power at uncomfortable integral basis station or reduce down transmitting power by the step-length of setting, when communication quality parameter does not meet the demands, be defined as demanding terminal and increase down transmitting power, execution in step B;
B. judging to increase down transmitting power, comprising:
B1. at first judge in requiring to increase the time slot of down transmitting power terminal works, whether to have only this terminal in work, when having only this terminal in work, have in the base station under the situation of dump power, by the down transmitting power of default step-length increase to this terminal, return steps A,, then return steps A if the base station does not have dump power, as other-end in when work, execution in step B2;
B2. this terminal is defined as the first estate terminal, and by predetermined number of degrees determine can be disturbed when increasing the down transmitting power of the first estate terminal other each grade terminals below the first estate, with each grade terminal judges for can increase down transmitting power, and execution in step C;
When C. dump power being arranged, simultaneously each grade terminal is increased down transmitting power by default grade power increment respectively in the base station.
2. method according to claim 1 is characterized in that described steps A, and its execution specifically comprises:
A1. the bLock error rate BLER of systems inspection terminal received signal;
A2. equal its set point as bLock error rate BLER, perhaps the bLock error rate BLER absolute value within predetermined Δ time that is lower than the difference between its set point and its set point and the bLock error rate BLER is not done any adjustment;
When A3. the absolute value that is lower than the difference between its set point and its set point and the bLock error rate BLER as bLock error rate BLER is greater than predetermined Δ, then by the predetermined long step by step down transmitting power that reduces this terminal;
A4. when bLock error rate BLER is higher than its set point, check the ratio Eb/I of received signal level Rx and received signal and interference;
A5. the ratio Eb/I that equals its set point and received signal and interference as received signal level Rx equals its set point, does not do any adjustment;
Perhaps, received signal level Rx is higher than the absolute value of difference of its set point and received signal level Rx and its set point within predetermined value, and the absolute value of difference that the ratio Eb/I of received signal and interference is higher than the ratio Eb/I of its set point and received signal and interference and its set point is not done any adjustment within predetermined value;
A6. be higher than the absolute value of difference of its set point and received signal level Rx and its set point greater than predetermined value as received signal level Rx, and the absolute value of the ratio Eb/I of received signal and the interferences ratio Eb/I that is higher than its set point and received signal and interferences and the difference of its set point is during greater than predetermined value, then by the down transmitting power of this terminal of the reduction of length step by step of being scheduled to;
A7. be lower than its set point as received signal level Rx, or the ratio Eb/I of received signal and interference carries out described step B when being lower than its set point.
3. method according to claim 1, it is characterized in that: among the described step B1, having only this terminal to have under the situation of dump power in work and base station, also judge when the down transmitting power that increases this terminal and can not disturb the adjacent cell terminal, then increase in the time of can not disturbing, then limit the increase down transmitting power in the time of can disturbing.
4. method according to claim 1, it is characterized in that the execution of described step B2, specifically comprise: begin to investigate from the first estate terminal, in the downlink forming beamwidth of the current grade terminal of being investigated, whether check has the other-end of working simultaneously and not being taken into account, during the other-end of not working simultaneously, then direct execution in step C, have and work simultaneously and investigated when interior other-end, these other-ends are defined as current next grade terminal of being investigated the grade terminal, with the current grade terminal that this next grade terminal is investigated as quilt, repeat this process and when reaching predetermined number of degrees, stop, and execution in step C.
5. method according to claim 4 is characterized in that: the downlink forming beamwidth of the described current grade terminal of being investigated, be descending arrival direction DOA ± Θ, and Θ is the angle between shaped-beam half-power point and the wave beam principal direction.
6. method according to claim 1, it is characterized in that also comprising step B3 between described step B2 and step C: can not disturb the adjacent cell terminal when judging the down transmitting power that increases each grade terminal, being judged as in the time of can not disturbing the adjacent cell terminal to increase down transmitting power, otherwise restriction increases down transmitting power.
7. according to claim 3 or 6 described methods, it is characterized in that: whether can disturb the adjacent cell terminal when described judgement increases down transmitting power, specifically comprise:
Timing Advance TA value according to the terminal emission that provides in the measurement report, estimate the distance between this terminal and base station, when judging that according to distance terminal is in the edge of sub-district and limits its maximum downstream transmitting power, the adjacent cell terminal can be disturbed when then being defined as increasing the down transmitting power to this terminal, otherwise the adjacent cell terminal can not be disturbed when being defined as increasing down transmitting power to this terminal.
8. method according to claim 7 is characterized in that: describedly judging that according to distance terminal is in the edge of sub-district, is to surpass 80% o'clock of radius of society in described distance.
9. according to claim 3 or 6 described methods, it is characterized in that: described restriction increases down transmitting power, is that system adds a fixed amount on the down transmitting power basis of its configuration when terminal access, link establishment.
10. method according to claim 1, it is characterized in that: described step C, when the first estate terminal is increased down transmitting power Δ P, to each the grade terminal below the first estate terminal, the down transmitting power/adjacent rank power increment that increases by last grade terminal increases the down transmitting power of next grade terminal.
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| CNB2004100423125A CN100365949C (en) | 2004-05-17 | 2004-05-17 | Method for implementing downlink power control in mobile communication system having intelligent antenna |
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| CN101094015B (en) * | 2006-06-23 | 2011-09-21 | 普天信息技术研究院 | Method for controlling initial emission power in open loop in mobile communication system |
| CN101174860B (en) * | 2007-11-14 | 2011-05-11 | 中兴通讯股份有限公司 | Forward power overloads control method |
| CN103096450A (en) * | 2011-11-04 | 2013-05-08 | 上海瀚讯无线技术有限公司 | Power control method under high-speed moving scene |
| US10849076B2 (en) * | 2017-06-26 | 2020-11-24 | Mediatek Inc. | Physical random access channel preamble retransmission for NR |
| CN113873619A (en) * | 2020-06-30 | 2021-12-31 | 中兴通讯股份有限公司 | Network device power adjustment method, electronic device and storage medium |
| CN114666882B (en) * | 2022-04-25 | 2024-01-02 | 浙江省通信产业服务有限公司 | Power control method, device, base station and storage medium |
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