CN1399435A - Forward power overload controlling method in CDMA system - Google Patents
Forward power overload controlling method in CDMA system Download PDFInfo
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- CN1399435A CN1399435A CN 01126369 CN01126369A CN1399435A CN 1399435 A CN1399435 A CN 1399435A CN 01126369 CN01126369 CN 01126369 CN 01126369 A CN01126369 A CN 01126369A CN 1399435 A CN1399435 A CN 1399435A
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Abstract
The forward power overload controlling method for CDMA system includes counting total emitting power in every frame of system; averaging total emitting power in every overload period to obtain the total system power in the overload period; comparing the total system power in the overload period with preset several levels of overload controlling threshold to judge the system power load case; and starting corresponding overload control operation if the total system emitting power is greater than the lower preset threshold P1. The present invention considers the control speed and validity of overload control and the utlization of system power resource and raises the system capacity while ensuring system safety and relaibility.
Description
Technical field
The present invention relates to a kind of Poewr control method of wireless telecommunication system, especially the forward power overload control technology in code division multiple access (CDMA) communication system.
Background technology
Usually, the radio spread spectrum communication technology that is used for digital mobile cellular telecommunication has three kinds: frequency division multiple access (FDMA), time division multiple access (TDMA) and code division multiple access (CDMA).Wherein preceding two kinds of multi-access mode FDMA and TDMA, every speech channel take certain frequency range or the time wide, when frequency reuse one regularly, the telephone path capacity of sub-district has just been determined.And another kind of multi-access mode CDMA is improving power system capacity, is alleviating the contradiction between limited frequency band and the unlimited user's request, satisfies the network operator to high power capacity, cheapness, aspect such as mobile communication needs but has superiority greatly efficiently.CDMA is exactly that each signal is assigned with a pseudo-random binary sequence and carries out spread spectrum, and the energy of unlike signal is assigned in the different pseudo random sequences.At receiver end, signal is separated with correlator, and this correlator receives only selected binary sequence and compresses its frequency spectrum, and the signal of all this user's binary sequences that do not match just is not compressed bandwidth.Like this, only discern and extract useful signal.The major parameter of decision cdma system capacity has processing gain, required signal to noise ratio (Eb/No), voice activation coefficient, channeling efficient and number of sectors etc., is subjected to condition effect such as concrete geographical environment, background noise, external disturbance in addition.
With regard to cdma system, the capacity of its reverse link mainly is subject to other users' interference.Number of users increases in the sub-district, and is also big more to the interference of useful signal, can prove, under certain environment and the condition, reach certain signal to noise ratio, the number of users that can hold in the sub-district is certain.The capacity of forward link then mainly is subject to system power.Along with increasing of number of users in the sub-district, the interference that travelling carriage receives increases, satisfy same demodulation signal to noise ratio, required useful signal must increase, this just requires the transmitting power of base station to increase, the increase of this transmitting power can cause interference to other user again, also needs to increase this user's base station transmitting power, exhausts until base station transmitting power.As seen, to reach raising capacity under the prerequisite that guarantees communication quality, alleviate the contradiction between limited frequency band and the huge number of users, must effectively manage the power resource of system to the forward link of cdma system.This effective management comprises two aspects: will realize the accurate control to user power on the one hand, reduce transmitting power as far as possible on the basis of satisfying the user communication quality requirement, to avoid interference and the raising power system capacity to other user.On the other hand,, also need the total transmitting power of system is controlled fail safe and the reliability in its coverage, moved with the assurance system unique user being carried out power accurately in the control.
The present invention is conceived to total transmitting power of base station is managed, and just introduces the power overload controlling mechanism in system.For a certain base station, if produce power overload, surpass the maximum transmission power level that allows of system, then can not guarantee the transmitting power percentage of pilot tone, just may cause the problem of covering, soft handover aspect, cause the unreliable and unstable of system.Total excessive overload that causes of transmitting power also can increase the interference to the successive bands wireless environment, pollutes, and can not satisfy the related standards about transmitting power.And along with the introducing of high-speed data service, the pace of change of the total transmitting power in base station and amplitude of variation all can be aggravated, and the probability of system power overload is increased greatly.
In present power overload controlling method, generally be total transmitting power of monitored base stations, transship control then.U.S. Pat 006094585, " CDMA FORWARD LINK POWEROVERLOAD CONTROL IN A BASE STATION ", its basic technical scheme is that emission power of forward link is sampled with spreading rate, every frame is done once average.System refuses before system reaches the harm state according to this frame power average value or blocks new power requirement.This method only proposes to refuse or block new power requirement, and active user's power condition of system is not controlled, and on the other hand, thereby this method is to guarantee that system safety leaves the capacity that too many allowance has reduced system.Another U.S. Pat 006067659, " METHOD AND SYSTEM FOR ALLOCATING TRANSMIT POWER TOSUBSCRIBER UNITS IN A WIRELESS COMMUNICATIONS SYSTEM ", then propose, when transmitting user data, transmitting power based on customer requirements has one to distribute transmitting power, sort according to user's the priority and the transmitting power size of distribution, when total transmitting power of distributing surpasses maximum permission transmitting power, transmitting power is limited by the priority that sorts.This method increases the complexity of system, especially in the user compact district or load when heavier, can greatly increase the burden of processor.
Summary of the invention
The method that the purpose of this invention is to provide a kind of forward power overload control under the prerequisite that guarantees the system safety reliability service, improves power system capacity.
For realizing goal of the invention, the method that the present invention proposes mainly may further comprise the steps:
(1) the total transmitting power of every frame of statistical system;
(2) every load period of crossing averages the total transmitting power of every frame in this cycle, obtains this and crosses the interior total transmitting power of system of load period;
(3) the total transmitting power of this being crossed in the load period of system compares with the multistage overload control thresholding that pre-sets, and judges the power termination situation of system;
(4) if the total transmitting power of system greater than minimum set threshold value P1, then begins to transship accordingly control operation:
(4.1) if system belongs to the one-level overload, judge then whether data traffic channels is arranged in the system, then discharge this data traffic channels if having;
(4.2) if system belongs to the secondary overload, except the operation of carrying out (4.1), also want the access of block new calls;
(4.3) if system belongs to three grades of overloads, except the operation of carrying out (4.2), also to block the adding of soft handover;
(4.4) if system belongs to the level Four overload, except the operation of carrying out (4.3), also to forbid existing user's flash-up requirement.
Described forward power overload control method, described step (1) comprising:
The transmitting power of each sector on the statistical channel plate, and record global positioning system (GPS) time; Transmitting power with common sector in the same frame on each channel board adds up then, obtains the total transmitting power of every frame.
Described forward power overload control method, the flash-up requirement of forbidding existing user in the described step (4.4) can be: revising the channel gain higher limit is current channel yield value, system is controlled in this higher limit the power of each channel and carries out.
Described forward power overload control method, the flash-up requirement of forbidding existing user in the described step (4.4), can also be: the former upper gain limit value of establishing of adjusting all channels, make its percentage that descends, system is controlled in the upper gain limit value after the decline the power of each channel and carries out.
With respect to existing method, method of the present invention adopts multistage overload control, according to the definite obstruction that different capacity is required of the different loads situation of system, when system load is heavier, except that blocking, also forbid the growth of existing user power, realize transshipping rapidly the power control effect, take all factors into consideration the control rate of overload control and the efficient of the validity and the system power utilization of resources, on the basis that guarantees the system safety reliability service, improved the capacity of system.
Description of drawings
Below in conjunction with drawings and Examples the present invention is done detailed explanation.
Fig. 1 is the schematic diagram that concerns of forward power control flow and forward power overload control flow.
Fig. 2 is the forward power overload control flow chart that the present invention proposes.
Fig. 3 is the flow chart of the step 250 among Fig. 2.
Embodiment
Forward power overload control and forward power control are closely related, and the available Fig. 1 of both relations represents that clearly the thin solid arrow among the figure is represented exterior ring power control, and solid arrow is represented power overload control, and empty arrow is represented inner loop power control.Forward power control divides control of outer shroud power and closed power control.Exterior ring power is controlled at mobile phone (MS) side and realizes, closed power control is realized jointly by base station (BTS) and mobile phone.Exterior ring power control is achieved in that when mobile phone receives forward frame, carry out demodulating and decoding 100, obtain frame quality information and Eb/No, utilize the frame error rate 110 of frame quality information statistics forward frame, compare with the frame error rate (sign speech quality) of default, adjust the Eb/No threshold value 120 of setting.From demodulating information, obtain Eb/No140, Eb/No threshold value with external circule power control compares 130 then, obtain closed power control bit 150, be inserted into that (RC1 and RC2) issues the base station in reverse power control subchannel (more than the RC3) or the reverse traffic frame, the base station demodulates the power control bit 160 in the reverse traffic frame, and extract power control bit 170, utilize this power control bit to adjust channel gain 180.Safe and reliable operation for system, introduce the power overload controlling method that the present invention proposes, shown in the solid arrow among the figure, total transmitting power situation of statistical system is periodically determined the loading condition of system to compare then with the overload power control threshold value that pre-sets, the overload conditions 190 of judgement system, if system overload then transships control operation according to the overload degree, guarantee the fail safe and the reliability of system.
Fig. 2 is the forward power overload control flow chart that the present invention proposes.The total transmitting power 210 of every frame of statistical system at first, in general, this also can realize by the hardware of system, directly read this performance number from radio frequency.The present invention is achieved in that the transmitting power of each sector on the statistical channel plate, and record global positioning system (GPS) time; The transmitting power of common sector in the same frame on each channel board is added up, obtain the total transmitting power of every frame.Then this total transmitting power of every frame of crossing in the load period is averaged, obtain this and cross the interior total transmitting power 220 of system of load period.The total transmitting power of again this being crossed in the load period of system compares with the multistage overload control thresholding that pre-sets, and judges the power termination situation 230 of system.The present invention is provided with corresponding four threshold value P1, P2, P3, P4, and P1＜P2＜P3＜P4.Determine the overload conditions of system according to the power termination situation of system, when the total transmitting power P of the system that statistics obtains＞P1, judge 240 and start the control operations 250 of corresponding overload step by step.
Fig. 3 is the overload judgment part among Fig. 2, is included in 250, and as the total transmitting power P of the system that statistics obtains＜P1, the expression system does not transship, and does not do any overload control operation; As P1＜P＜P2, be the one-level overload, carry out 320 overload operation this moment, if promptly in the system data traffic channels (F-SCH, forward complement channel) is arranged, then begin to discharge F-SCH; As P2＜P＜P3,,, also to begin 340 overload operation, i.e. the access of block new calls except that discharging the F-SCH for the secondary overload; As P3＜P＜P4, be three grades of overloads, remove the access that will discharge F-SCH, block new calls, also to begin 360 overload operation, the access of promptly blocking soft handover; As P＞P4, be the level Four overload, this moment is except that the access of the access that will discharge F-SCH, block new calls, obstruction soft handover, the power rising that also will forbid each channel requires 380, this can realize by two kinds of methods: revising the channel gain higher limit is current channel yield value, system is controlled in this higher limit the power of each channel and carries out, perhaps, adjust the former upper gain limit value of establishing of all channels, make its percentage that descends, system is controlled in the upper gain limit value after the decline the power of each channel and carries out.Like this, just can not surpass overload through the system's gross power after adjusting and judge system's gross power constantly, and blocked all system power requests this moment, so the system power general trend must reach the purpose of overload control for descending.
Claims (4)
1, a kind of forward power overload controlling method in CDMA system is characterized in that mainly may further comprise the steps:
(1) the total transmitting power of every frame of statistical system;
(2) every load period of crossing averages the total transmitting power of every frame in this cycle, obtains this and crosses the interior total transmitting power of system of load period;
(3) the total transmitting power of this being crossed in the load period of system compares with the multistage overload control thresholding that pre-sets, and judges the power termination situation of system;
(4) if the total transmitting power of system greater than minimum set threshold value P1, then begins to transship accordingly control operation:
(4.1) if system belongs to the one-level overload, judge then whether data traffic channels is arranged in the system, then discharge this data traffic channels if having;
(4.2) if system belongs to the secondary overload, except the operation of carrying out (4.1), also want the access of block new calls;
(4.3) if system belongs to three grades of overloads, except the operation of carrying out (4.2), also to block the adding of soft handover;
(4.4) if system belongs to the level Four overload, except the operation of carrying out (4.3), also to forbid existing user's flash-up requirement.
2, forward power overload control method as claimed in claim 1 is characterized in that described step (1) comprising:
The transmitting power of each sector on the statistical channel plate, and record global positioning system time; Transmitting power with common sector in the same frame on each channel board adds up then, obtains the total transmitting power of every frame.
3, forward power overload control method as claimed in claim 1 or 2, it is characterized in that the flash-up requirement of forbidding existing user in the described step (4.4), can be: revising the channel gain higher limit be current channel yield value, and system is controlled in this higher limit the power of each channel and carries out.
4, forward power overload control method as claimed in claim 1 or 2, it is characterized in that the flash-up requirement of forbidding existing user in the described step (4.4), can also be: the former upper gain limit value of establishing of adjusting all channels, make its percentage that descends, system is controlled in the upper gain limit value after the decline the power of each channel and carries out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB011263695A CN100409601C (en) | 2001-07-25 | 2001-07-25 | Forward power overload controlling method in CDMA system |
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| CNB011263695A CN100409601C (en) | 2001-07-25 | 2001-07-25 | Forward power overload controlling method in CDMA system |
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| CN1399435A true CN1399435A (en) | 2003-02-26 |
| CN100409601C CN100409601C (en) | 2008-08-06 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1298128C (en) * | 2003-07-17 | 2007-01-31 | 明基电通股份有限公司 | Data throughput adjusting method |
| CN101867999A (en) * | 2010-06-18 | 2010-10-20 | 中兴通讯股份有限公司 | Method for overpower control and base station |
| WO2010145536A1 (en) * | 2009-06-15 | 2010-12-23 | 华为技术有限公司 | Power detection method and base station based on discontinuous transmission |
| WO2010149064A1 (en) * | 2009-12-25 | 2010-12-29 | 中兴通讯股份有限公司 | Method and device for forward power overload control |
| CN101141708B (en) * | 2007-01-17 | 2011-05-11 | 中兴通讯股份有限公司 | Overload control method of urgent call and preempted preference call |
| CN101174860B (en) * | 2007-11-14 | 2011-05-11 | 中兴通讯股份有限公司 | Forward power overloads control method |
| CN101136671B (en) * | 2007-02-13 | 2011-08-10 | 中兴通讯股份有限公司 | Forward power overload control method |
| CN102802270A (en) * | 2011-05-27 | 2012-11-28 | 华为技术有限公司 | Random access processing method, base station, terminal and system |
| CN101547029B (en) * | 2008-03-28 | 2012-11-28 | 中兴通讯股份有限公司 | Method for controlling overloading of forward power in code division multiple access system |
| US8615249B2 (en) | 2008-02-04 | 2013-12-24 | Nec Corporation | Communications system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100250716B1 (en) * | 1997-10-31 | 2000-04-01 | 서평원 | Call control method for base station for cdma |
| US6094585A (en) * | 1997-11-14 | 2000-07-25 | Lucent Technologies Inc. | CDMA forward link power overload control in a base station |
| JP3031327B2 (en) * | 1998-03-26 | 2000-04-10 | 日本電気株式会社 | Spread spectrum communication system and overload control method thereof |
| CA2311901A1 (en) * | 1999-07-19 | 2001-01-19 | Lucent Technologies Inc. | Aggregate overload power control |
-
2001
- 2001-07-25 CN CNB011263695A patent/CN100409601C/en not_active Expired - Fee Related
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1298128C (en) * | 2003-07-17 | 2007-01-31 | 明基电通股份有限公司 | Data throughput adjusting method |
| CN101141708B (en) * | 2007-01-17 | 2011-05-11 | 中兴通讯股份有限公司 | Overload control method of urgent call and preempted preference call |
| CN101136671B (en) * | 2007-02-13 | 2011-08-10 | 中兴通讯股份有限公司 | Forward power overload control method |
| CN101174860B (en) * | 2007-11-14 | 2011-05-11 | 中兴通讯股份有限公司 | Forward power overloads control method |
| US8615249B2 (en) | 2008-02-04 | 2013-12-24 | Nec Corporation | Communications system |
| CN103561437B (en) * | 2008-02-04 | 2017-04-12 | 日本电气株式会社 | Signalling of resource status information between base stations for load balancing |
| US11864047B2 (en) | 2008-02-04 | 2024-01-02 | Nec Corporation | Methods and base stations for reporting results of load measurements |
| US11153799B2 (en) | 2008-02-04 | 2021-10-19 | Nec Corporation | Communication system |
| US10555232B2 (en) | 2008-02-04 | 2020-02-04 | Nec Corporation | Communication system |
| US9843976B2 (en) | 2008-02-04 | 2017-12-12 | Nec Corporation | Communication system |
| US8886192B2 (en) | 2008-02-04 | 2014-11-11 | Nec Corporation | Communications system |
| US8670779B2 (en) | 2008-02-04 | 2014-03-11 | Nec Corporation | Communications system |
| CN102090105B (en) * | 2008-02-04 | 2014-03-19 | 日本电气株式会社 | Signalling of resource status information between base stations for load balancing |
| US8744475B2 (en) | 2008-02-04 | 2014-06-03 | Nec Corporation | Communications system |
| CN101547029B (en) * | 2008-03-28 | 2012-11-28 | 中兴通讯股份有限公司 | Method for controlling overloading of forward power in code division multiple access system |
| WO2010145536A1 (en) * | 2009-06-15 | 2010-12-23 | 华为技术有限公司 | Power detection method and base station based on discontinuous transmission |
| WO2010149064A1 (en) * | 2009-12-25 | 2010-12-29 | 中兴通讯股份有限公司 | Method and device for forward power overload control |
| CN101867999A (en) * | 2010-06-18 | 2010-10-20 | 中兴通讯股份有限公司 | Method for overpower control and base station |
| CN101867999B (en) * | 2010-06-18 | 2015-06-10 | 中兴通讯股份有限公司 | Method for overpower control and base station |
| WO2011157082A1 (en) * | 2010-06-18 | 2011-12-22 | 中兴通讯股份有限公司 | Power overload control method and base station |
| CN102802270B (en) * | 2011-05-27 | 2014-12-31 | 华为技术有限公司 | Random access processing method, base station, terminal and system |
| CN102802270A (en) * | 2011-05-27 | 2012-11-28 | 华为技术有限公司 | Random access processing method, base station, terminal and system |
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| CN100409601C (en) | 2008-08-06 |
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