CN1146169C - Method and control system for balancing loads between common frequency small regions in CDMA communication system - Google Patents
Method and control system for balancing loads between common frequency small regions in CDMA communication system Download PDFInfo
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- CN1146169C CN1146169C CNB00127600XA CN00127600A CN1146169C CN 1146169 C CN1146169 C CN 1146169C CN B00127600X A CNB00127600X A CN B00127600XA CN 00127600 A CN00127600 A CN 00127600A CN 1146169 C CN1146169 C CN 1146169C
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Abstract
The present invention relates to a method and a control system for balancing loads among identical frequency cells in a code division multiple access communication system. The present invention is characterized in that load conditions of cells are measured firstly; then, the loads of the cells belong to the condition of underload or normal or overload is judged according to obtained load information; according to the condition of the judgment, pilot frequency transmitting power is increased or reduced or maintained. The present invention can make the CDMA system greatly improve or eliminate the load unbalance phenomena among the cells, realize the load balance and increase the performance of the system and the utilization rate of resources.
Description
Technical field
The present invention relates to the method and the control system of balancing loads between common frequency small regions control in code division multiple access (the to call CDMA in the following text) cell mobile communication systems.
Background technology
CDMA is a kind of spread spectrum technic.Spread spectrum technic mainly applies to military communication in the early stage, because its remarkable performance also will obtain to use widely in the commercial communication field.Now there has been commercial cdma cellular mobile communication system to operate in the telecommunications network.
In cdma system, a plurality of sub-districts can use same carrier frequency to communicate simultaneously, at transmitter side, the signal of each link uses different PN sign indicating numbers to modulate respectively, these signals that take same frequency range are distinguished by the code word of quadrature at receiving terminal (going up the behavior base station, following behavior travelling carriage).
In the cdma communication system, the maximization of power system capacity is a very important problem.Because cdma system is a self-interference system, the transmitting power of each travelling carriage is to other travelling carriage, all be to disturb, in the system of reality, control by power, the transmitting power that makes base station and each travelling carriage makes system can insert user as much as possible satisfying maintenance minimum under the situation of certain communication quality.
In the existing cell mobile communication systems,, make that the radio-frequency power of base station is confined within certain scope (sub-district) in the system for the utilance that improves frequency spectrum resource and the capacity of whole system.Enter the another one sub-district when travelling carriage leaves a sub-district, the signal of the original sub-district that this travelling carriage is received inevitable more and more a little less than, and its received signal that enters the sub-district will be more and more stronger just also.In order to keep the communication quality of travelling carriage, must switch to the stronger base station of signal that newly enters by original base station to continuing of this travelling carriage, the notion of switching in Here it is the cell mobile communication systems.
The strategy that switches has strategies such as network control switching, Mobile Assisted Handover, travelling carriage control switching, the strategy that initial cell mobile communication systems generally adopts network control to switch.And the system that upgrades, as GSM, IS-95 system etc. all adopts the strategy of Mobile Assisted Handover.In 3G-WCDMA, also adopt the strategy of Mobile Assisted Handover.
In the cdma system, pilot signal of each base station, in the process of Mobile Assisted Handover, travelling carriage will be measured the pilot signal strength of several base stations, and enough set up at the pilot signal receiving intensity and to select one or more best communicating in the sub-district of communication.
Because travelling carriage is selected the sub-district of communicating by letter according to the receiving intensity of pilot signal, so, in fact there is a handoff boundary, on handoff boundary, the pilot power of two base stations that travelling carriage receives equates.If change the pilot signal transmission intensity of each cell base station, will directly influence the position of the handoff boundary of minizone, pilot transmit power increases, the border of respective cell will be expanded, otherwise reduce pilot transmit power, the border of respective cell will be shunk, Here it is cell breathing.
Ideally, travelling carriage evenly distributes in each sub-district, and the resource of each sub-district can both obtain rationally, utilize efficiently.But under the actual conditions, because a variety of causes, the load state of each sub-district is also different, the communication quality of the overweight sub-district of load worsens, the access success rate reduces, but the load of the neighbor cell of this sub-district possibility is lighter simultaneously, residual capacity is still arranged, from the angle of whole system, exist the wasting phenomenon of resource, at this moment just can utilize cell breathing to change the border of sub-district, thereby change the number of users of each sub-district, reach load balance, make the resource of each sub-district can both obtain reasonable use, improve the capacity of system.
Existing balancing method of loads, it mainly is loading condition according to the sub-district, by adjusting the transmitting power of handoff parameter and change district pilots signal, the load bridging that makes the overweight sub-district of load is in the lighter sub-district of adjacent load, reach the purpose of load balance, or adjust the transmitting power of district pilots signal according to the communication quality of link, obtaining communication quality preferably, but all there is apparent in view shortcoming in these methods.
U.S. Pat 5,781,861 have proposed the method for " carrying out load bridging by adjusting handoff threshold ", its to the effect that:
If the current area traffic density is too high, when forward direction link signal power surpasses a certain predetermined thresholding, and simultaneously adjoining Zone density is when low, can with the part of high traffic density sub-district professional by switched and transferred to low traffic density sub-district.The way that proposes in this patent be by handoff parameter T-ADD that revises all mobile radio stations in the current area and T-DROP realize high traffic density Zone to the shunting of density service district, under the situation that does not change cell coverage area, realize the minizone load balance.
In the cdma system, can determine the coverage of sub-district by the intensity of pilot signal, when one with the mobile radio station of base station communication, on the border of A sub-district when move the B sub-district, the pilot signal strength that mobile radio station receives can change, to increase and reduce along with distance from the pilot signal received power of A sub-district, will constantly increase from the pilot signal received power of B sub-district.The pilot signal strength of each sub-district is accepted and measured to travelling carriage, calculate the Ec/It ratio of (pilot signal strength with all interfering signal powers), Ec/It ratio and thresholding T-ADD with the B sub-district compares then, if Ec/It＞T-ADD, mobile radio station just sends the soft handover request to the A cell base station, and the operation of a soft handover has just begun.In the process that continue to move, the pilot signal strength of moving station measuring band A sub-district, when Ec/It＜T-DROP, soft switching process is finished.
Traffic carrying capacity increase as sub-district A, when having surpassed certain thresholding, we can begin thresholding T-ADD and soft handover end thresholding T-DROP by the mobile radio station soft handover of revising in all A sub-districts, impel the mobile radio station of A cell edge to leave the A sub-district, enter adjacent sub-district.
Mobile radio station in the A sub-district is after changing parameter, because thresholding T-DROP improves, cell edge is in the mobile radio station of soft changing state with ends soft handover, leaves the A sub-district, thereby has reduced the load of A sub-district.In order to keep a certain amount of user to be in soft changing state, when improving T-DROP, reduced the T-ADD thresholding.Reduce the T-ADD thresholding, can not increase the load of A sub-district, only can increase the load of adjacent cell.In fact the result of parameter modification has reduced the load of A sub-district, has increased the load of peripheral cell, thereby realizes the load shunting and the transfer of sub-district towards periphery of A sub-district.
The major defect of this patent is:
1. it is big to revise the required signaling traffic of handoff parameter;
2. because two parameters will influence the selection of travelling carriage to all sub-districts, that is to say, after the change parameter, just changed the residing Zone switched size of travelling carriage, and do not influenced the selection of travelling carriage Serving cell;
3. have problems: be in the parameter which sub-district Zone switched travelling carriage should use;
If 4. system may adopt relative handoff threshold, at this moment revise these two parameters and will can not play effect the load bridging of sub-district.
U.S. Pat 5,548,812 have proposed the method for " pilot transmit power is controlled a cell breathing ", its to the effect that:
This patent has proposed the handoff boundary balance, be a kind of cell breathing control based on pilot transmit power control, its principle is: in the cdma system of sub-district more than, be in and have two kinds of handoff boundary between two base stations--go up row bound and descending boundary, on travelling carriage is being on the row bound, when the signal of emission arrived two base stations, the signal quality that two base stations receive was the same; When travelling carriage is being on the descending boundary, when the signal of two base station arrived the receiver of travelling carriage, two signal of base station quality all were the same.
The uplink load situation of sub-district will influence the position of row bound, when the community user number increases, the signal power that receives owing to go to the station to meet somebody increases, for each user, uplink interference has also increased thereupon, because the uplink interference level difference of two base stations, so signal from original last row bound transmission, signal to noise ratio when arriving two base stations also can be different, last row bound will move to the big base station of uplink interference, that is to say that the increase of uplink interference can cause up handoff boundary to be shunk to cell base station.
In the travelling carriage assist in soft handover, travelling carriage is determined handoff boundary by the pilot signal receiving intensity of each sub-district, so the position of descending boundary can be controlled by the pilot transmit power of each base station.
When the zero load of sub-district, can select the proper pilot transmitting power, make the last row bound of each sub-district can be consistent with descending boundary, in the actual moving process of system, along with the variation of access customer number and the variation of uplink interference, last row bound may be no longer consistent with descending boundary, be in the travelling carriage between row bound and the descending boundary, if select the interior base station communication of last row bound at place, can use littler transmitting power, but because travelling carriage is selected the base station of communication according to descending boundary, at this moment travelling carriage needs the base station communication of transmitting power greatly with another.So need real-time adjustment descending boundary, keep consistent with last row bound.
Based on top thought, proposed a kind ofly to adjust pilot transmit power in this patent, kept the method for uplink and downlink border unanimity according to received signal intensity:
Received signal power * pilot transmit power=constant (CONSTANT)
Just select the proper pilot transmitting power, keep the product of received signal power and emission power of pilot signal to remain a constant.
The major defect of this patent:
1. only considered the influence of ascending load,, selected the base station preferably of uplink quality to communicate from the angle of travelling carriage to system;
2. pilot transmit power adjustment, after the sub-district handoff boundary changed, the down load situation of sub-district was bigger than the influence that ascending load is subjected to, if the asymmetric words of uplink and downlink load of sub-district can make system's letter worsen more on the contrary;
3. the variation of a up boundary position except the influence that is subjected to this ascending load of cell, also is subjected to the influence of the ascending load of other adjacent co-frequency cell, does not consider here;
4. when the load increase, after the handoff boundary of each sub-district is all shunk, coverage hole may appear.
U.S. Pat 5,898,682 have proposed " wireless channel control method ", and its main contents also are to adjust the transmitting power of district pilots signal according to the communication quality of link, to obtain communication quality preferably.The major defect of this patent:
1. the communication quality of one or more Code Channels can only reflect the quality of these channels wireless propagation environment separately, with concrete scene (blocking of the mobile route of travelling carriage, translational speed, building) confidential relation is arranged, adjusting its result of district pilots transmitting power according to the communication quality of one or more Code Channels has very big randomness, to improve communication quality and have little significance;
2. in the code division multiple access system of reality, can by access control with the load limitations of system in reasonable range, in this scope, control by power, the communication quality of each Code Channel can guarantee to stablize on the predefined target, therefore can not occur the phenomenon that the Code Channel communication quality worsens in actual applications, this method can not get a desired effect in such real system.
In sum, in the cdma cellular mobile communication system, because the number of users difference that each sub-district is inserted, the loading level of each sub-district may be different, the sub-district that has, possible load is overweight, and its neighbor cell possibility load simultaneously is lighter, like this, the load of each sub-district is just uneven in the system.Under the situation of laod unbalance, the sub-district that load is overweight, the user's communications quality descends, new user can't insert, the handoff request that enters this sub-district from other sub-district and initiate will may cause communication disruption (call drop) because system resource can't cut inadequately, and its neighbor cell still some system resource be not utilized as yet.
Summary of the invention
The objective of the invention is that systematic function that laod unbalance causes descends and the waste problem of resource in order to solve, and balancing loads between common frequency small regions method and control system in a kind of code division multiple address communication system that proposes, balance with each minizone load in the maintenance system that tries one's best, the performance and the resource utilization of system all are improved, thereby have improved the capacity of cdma system.
The technical scheme that realizes the object of the invention is: the balance control method of load between co-frequency cell in a kind of code division multiple address communication system, be characterized in, according to the load of sub-district is the wherein a kind of situation that belongs in underload, normal, the overload, carry out the emission power of pilot signal adjustment, may further comprise the steps:
1. measure the total transmitting power of descending carrier of sub-district, as the tolerance of cell downlink load;
2. judge whether load surpasses overload threshold, if load surpasses overload threshold, then the sub-district is in overload, and not 5. 3. execution in step surpass the overload threshold execution in step as if load;
3. judge whether emission power of pilot signal has reached minimum value, if also do not reach minimum value, 1. 4. execution in step if reach minimum value, then return step;
4. reduce emission power of pilot signal by predetermined step-length, return step 1.;
5. judge whether the present load situation is lower than underload thresholding, if load is lower than underload thresholding, then the sub-district is in underload state, and 6. execution in step is higher than underload thresholding as if load, and execution in step 8.;
6. judge whether emission power of pilot signal has reached maximum, if also do not reach maximum, 1. 7. execution in step then return step if reach maximum;
7. increase emission power of pilot signal by predetermined step-length, return step 1.;
8. cell load is normal, and it is constant then to keep current emission power of pilot signal value, returns step 1..
The balance control method of load between co-frequency cell in above-mentioned a kind of code division multiple address communication system, wherein, step 2., the cell load described in 5. is divided into three kinds of different situations by two thresholdings, carries out different disposal.
The balance control method of load between co-frequency cell in above-mentioned a kind of code division multiple address communication system, wherein, step is 4., the predetermined step-length described in 7. is meant; According to regulating the speed and the optimum value of precision and an artificial numerical value of setting of district pilots transmitting power to transmitting power increment or decrement.
The balance control method of load between co-frequency cell in above-mentioned a kind of code division multiple address communication system, wherein, step increasing emission power of pilot signal by predetermined step-length and be meant described in 7.: increase pilot transmit power, enlarge the coverage of sub-district, the load that the sub-district utilizes the idle capacity of oneself initiatively to share adjacent cell.
The balance control method of load between co-frequency cell in above-mentioned a kind of code division multiple address communication system, wherein, the emission power of pilot signal minimum value of step described in 3. is meant: minimum pilot transmit power is set, guarantees in the pilot tone adjustment process, the cavity can not occur covering.
The balance control method of load between co-frequency cell in above-mentioned a kind of code division multiple address communication system, among its spy, the step-length by predetermined of step described in 4. reduces emission power of pilot signal and is meant: reduce pilot transmit power, make Traffic Channel have more down transmitting power to use, increase the downlink capacity of sub-district.
Balancing loads between common frequency small regions control system in a kind of code division multiple address communication system comprises base station transceiver and base station controller; Described base station transceiver comprises antenna, transceiver, is characterized in, described base station transceiver also comprises measuring unit and control unit; Described base station controller comprises load state decision unit and pilot power adjustment decision unit; The collection of letters end of transceiver is transferred to measuring unit from the signal that antenna receives in the base station transceiver, the output signal of this measuring unit is transferred to the load state decision unit of base station controller, after the load state judgement, be transported to pilot power and adjust decision unit, adjust the control unit that decision unit is transferred to base station transceiver from pilot power again, size by this control unit control increase and decrease pilot power, go out to antenna transmission by sender, adjust cell load.
Because the present invention has adopted above technical measures, makes the cdma cellular mobile communication system can improve or eliminate the laod unbalance phenomenon of minizone greatly.After the fractional load of the overweight sub-district of load is shared by adjacent cell, can continue to insert more user, reduce the percent of call lost, better guarantee the communication quality of current area, improve adjacent cell and switch the success rate that enters, reduce cutting off rate to this sub-district.Thereby reach the target that improves power system capacity and improve systematic function.
This method has following advantage:
1. method is simple, only adjusts emission power of pilot signal and just can realize the load balance adjustment, is easy to realize;
2. the load that only needs to measure this sub-district just can be carried out load balance control, does not need to consider the load state of other sub-district;
3. suitable in load, when the utilization of resources is reasonable, do not adjust, significantly reduced unnecessary adjustment, thereby made system's operation more stable, also reduced the load of adjustment member;
4. not by air interface and travelling carriage interactive information, do not take valuable Radio Resource;
5. avoid occurring coverage hole.
Description of drawings
Concrete feature of the present invention, performance further are illustrated by following embodiment and accompanying drawing thereof.
Fig. 1 is that cell load situation of the present invention is divided schematic diagram.
Fig. 2 is a load balance control system schematic diagram of the present invention.
Fig. 3 is a load control procedure schematic diagram of the present invention.
Fig. 4 is that cell load balance of the present invention is adjusted schematic diagram.
Embodiment
Systematic function that laod unbalance causes descends and the waste problem of resource in order to solve, the load that need allow the neighbor cell that hangs down load come the overweight sub-district of load sharing.
Since travelling carriage during to the selection of Serving cell based on the intensity measurements that receives pilot signal, and select the sub-district according to certain method, initiate handoff request, be cut in the new sub-district and go, therefore can adjust the emission power of pilot signal of base station according to this characteristic, thereby influence the switching of travelling carriage, realize the purpose of load bridging.
Fig. 1 is that each cell load situation of the present invention is divided schematic diagram.Cell load of the present invention comprises ascending load and down load.The actual state of each load is divided into three zones by two thresholdings (overload threshold and underload thresholding): underload, normal and overload, under different states, emission power of pilot signal is done different adjustment, and make the load of each sub-district can balance as far as possible.Among the figure: the A line is represented overload threshold, and the B line is represented the present load level, and the C line is represented underload thresholding.
In a system that a plurality of sub-districts are arranged, the pilot transmit power of each sub-district all have an adjusting range one from minimum pilot transmit power to maximum pilot transmit power, the transmitting power of pilot signal is adjusted in each sub-district according to the loading condition of sub-district separately, loading in each sub-district in the system distributed uniformly, minimum pilot transmit power has guaranteed that each sub-district in the process that load is adjusted, can not cause covering the appearance in cavity because pilot transmit power is too small.
Under underload state (load is lower than underload thresholding), the sub-district should increase pilot transmit power, absorbs and share the load of adjacent each sub-district;
Under overload (load is higher than overload threshold), should reduce emission power of pilot signal, to neighbor cell, avoid load transfer overweight load to cause the deterioration of each mobile communications quality in the sub-district;
When load is higher than underload thresholding and is lower than overload threshold, can think that the local resource of this moment is reasonably used, need not adjust the transmitting power of pilot signal.
Below for a more detailed description to the present invention by an embodiment.
See also Fig. 2, this is a load balance control system schematic diagram of the present invention.Control system of the present invention comprises base station transceiver and base station controller, base station transceiver 1 comprises antenna 11, transceiver 12, measuring unit (being used to measure the total transmitting power of descending carrier of sub-district) 13 and control unit 14, and base station controller 2 comprises load state decision unit 21 and pilot power adjustment decision unit 22; The collection of letters end of transceiver 12 is transferred to measuring unit 13 from the signal that antenna 11 receives in the base station transceiver 1, the output signal of this measuring unit 13 is transferred to the load state decision unit 21 of base station controller 2, after the load state judgement, be transported to pilot power and adjust decision unit 22, adjust the control unit 14 that decision unit 22 is transferred to base station 1 transceiver from pilot power again, size by this control unit control increase and decrease pilot power, send through antenna 11 by sender, reach the purpose of adjusting pilot power, balance cell load according to cell load.
See also Fig. 3, this is a load control procedure schematic diagram of the present invention.Load balance control method of the present invention can (cell load that indication of the present invention is measured comprises ascending load and down load, and this cell load is divided into three kinds of different situations by two thresholdings, carries out different disposal according to the load of measuring the sub-district.Cooperation is referring to Fig. 1.) be belong to underload, normal, the overload in wherein a kind of situation, carry out the emission power of pilot signal adjustment, wherein:
If a sub-district is underload, and emission power of pilot signal do not reach maximum, then increases emission power of pilot signal;
If the b cell-overload, and emission power of pilot signal do not reach minimum value, then reduces pilot transmit power;
If the c cell load is normal, then keep current pilot transmit power value;
Concrete judgement and adjustment may further comprise the steps:
1. measure the total transmitting power of cell downlink carrier wave, as the tolerance of cell load situation;
2. judge whether load surpasses overload threshold, if load surpasses overload threshold, then the sub-district is in overload, and not 5. 3. execution in step surpass the overload threshold execution in step as if load;
3. judge whether emission power of pilot signal has reached minimum value, if also do not reach minimum value, 1. 4. execution in step if reach minimum value, then return step;
4. reduce emission power of pilot signal by predetermined step-length, return step 1.;
5. judge whether the present load situation is lower than underload thresholding, if load is lower than underload thresholding, then the sub-district is in underload state, and 6. execution in step is higher than underload thresholding as if load, and execution in step 8.;
6. judge whether emission power of pilot signal has reached maximum, if also do not reach maximum, 1. 7. execution in step then return step if reach maximum;
7. increase emission power of pilot signal by predetermined step-length, return step 1.;
8. cell load is normal, and it is constant then to keep current emission power of pilot signal value, returns step 1..
Predetermined step-length described in the above-mentioned steps is meant; The artificial numerical value of setting according to the optimum value of the speed of district pilots transmitting power and precision to transmitting power increment or decrement.
The step-length increase emission power of pilot signal by predetermined described in the above-mentioned steps is meant: increase pilot transmit power, enlarge the coverage of sub-district, the load that the sub-district utilizes the idle capacity of oneself initiatively to share adjacent cell; Reduce emission power of pilot signal by predetermined step-length and be meant, reduce pilot transmit power, make Traffic Channel have more transmitting power to use, increase the downlink capacity of sub-district.
Adjustment by above step, each sub-district can be adjusted the transmitting power of pilot signal according to the loading condition of self, when load is overweight (load surpasses overload threshold), the pilot transmit power of sub-district begins to reduce, the edge of sub-district begins to shrink, the travelling carriage that is in cell edge may leave current service cell and switch to contiguous sub-district because the pilot signal of Serving cell reduces, and the load of this sub-district will reduce; When load measure next time, load may be lower than overload threshold and enter into the normal region, has so just reached the purpose of load balance control.Owing to be provided with minimum pilot transmit power (emission power of pilot signal minimum value), therefore guaranteed in the pilot tone adjustment process, the cavity can not appear covering.
When load is lower than underload thresholding, the pilot transmit power of sub-district begins to raise, the edge of sub-district begins expansion, be in cell edge neighbor cell travelling carriage since this district pilots transmitting power increase, be cut into current area, share the load of neighbor cell like this with regard to the surplus resources that has utilized the sub-district.
Cell load balance of the present invention is adjusted the result as shown in Figure 4, and the border shown in the dotted line is the border before pilot transmit power is adjusted, and shown in the solid line is the adjusted border of pilot transmission.
The present invention can make cdma system improve greatly or eliminate the laod unbalance phenomenon of minizone, realizes load balance, improves the performance and the resource utilization of system.
Claims (7)
1, the balance control method of load between co-frequency cell in a kind of code division multiple address communication system is characterized in that, is the wherein a kind of situation that belongs in underload, normal, the overload according to the load of sub-district, carries out the emission power of pilot signal adjustment, may further comprise the steps:
1. measure the total transmitting power of descending carrier of sub-district, as the tolerance of cell downlink load state;
2. judge whether load surpasses overload threshold, if load surpasses overload threshold, then the sub-district is in overload, and not 5. 3. execution in step surpass the overload threshold execution in step as if load;
3. judge whether emission power of pilot signal has reached minimum value, if also do not reach minimum value, 1. 4. execution in step if reach minimum value, then return step;
4. reduce emission power of pilot signal by predetermined step-length, return step 1.;
5. judge whether the present load situation is lower than underload thresholding, if load is lower than underload thresholding, then the sub-district is in underload state, and 6. execution in step is higher than underload thresholding as if load, and execution in step 8.;
6. judge whether emission power of pilot signal has reached maximum, if also do not reach maximum, 1. 7. execution in step then return step if reach maximum;
7. increase emission power of pilot signal by predetermined step-length, return step 1.;
8. cell load is normal, and it is constant then to keep current emission power of pilot signal value, returns step 1..
2, the balance control method of load between co-frequency cell in a kind of code division multiple address communication system according to claim 1 is characterized in that, step 2., the cell load described in 5. is divided into three kinds of different situations by two thresholdings, carries out different disposal.
3, the balance control method of load between co-frequency cell in a kind of code division multiple address communication system according to claim 1, it is characterized in that step 4., the predetermined step-length described in 7. is meant: according to regulating the speed and the optimum value of precision and an artificial numerical value of setting of district pilots transmitting power to transmitting power increment or decrement.
4, the balance control method of load between co-frequency cell in a kind of code division multiple address communication system according to claim 1, it is characterized in that, step increasing emission power of pilot signal by predetermined step-length and be meant described in 7.: increase pilot transmit power, enlarge the coverage of sub-district, the load that the sub-district utilizes the idle capacity of oneself initiatively to share adjacent cell.
5, the balance control method of load between co-frequency cell in a kind of code division multiple address communication system according to claim 1, it is characterized in that, the emission power of pilot signal minimum value of step described in 3. is meant: minimum pilot transmit power is set, guarantee in the pilot tone adjustment process, the cavity can not occur covering.
6, the balance control method of load between co-frequency cell in a kind of code division multiple address communication system according to claim 1, it is characterized in that, the step-length by predetermined of step described in 4. reduces emission power of pilot signal and is meant: reduce pilot transmit power, make Traffic Channel have more down transmitting power to use, increase the downlink capacity of sub-district.
7, balancing loads between common frequency small regions control system in a kind of code division multiple address communication system comprises base station transceiver and base station controller; Described base station transceiver comprises antenna, transceiver, it is characterized in that described base station transceiver also comprises measuring unit and control unit; Described base station controller comprises load state decision unit and pilot power adjustment decision unit; The collection of letters end of transceiver is transferred to measuring unit from the signal that antenna receives in the base station transceiver, the output signal of this measuring unit is transferred to the load state decision unit of base station controller, after the load state judgement, be transported to pilot power and adjust decision unit, adjust the control unit that decision unit is transferred to base station transceiver from pilot power again, size by this control unit control increase and decrease pilot power, go out to antenna transmission by sender, adjust cell load.
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| CN1780170B (en) * | 2004-11-25 | 2012-06-06 | 中兴通讯股份有限公司 | Method for adjusting wide-band CDMA multiple address and carrier mobile telecommunication system down load |
| CN100370708C (en) * | 2004-11-26 | 2008-02-20 | 华为技术有限公司 | Method for controlling public channel transmissive power in base station |
| CN100372423C (en) * | 2005-01-11 | 2008-02-27 | 华为技术有限公司 | Load balancing method for layered WCDMA network |
| CN101322337A (en) * | 2005-10-14 | 2008-12-10 | 高通股份有限公司 | Methods and apparatus for determining, communicating and using information including loading factors for interference control |
| CN100461905C (en) * | 2006-03-28 | 2009-02-11 | 华为技术有限公司 | Method for regulating voice speed of radio base station cell |
| CN100441018C (en) * | 2006-12-01 | 2008-12-03 | 华为技术有限公司 | A method and device for measuring the load relation between the cells |
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| CN109219060B (en) * | 2017-07-06 | 2022-09-02 | 大唐移动通信设备有限公司 | Cell coverage area adjusting method and device |
| CN109661000A (en) * | 2018-12-19 | 2019-04-19 | 中国联合网络通信集团有限公司 | Management method, device, equipment and the readable storage medium storing program for executing of inefficient base station |
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2000
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