CN1893303B - Power overloading control method - Google Patents

Power overloading control method Download PDF

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Publication number
CN1893303B
CN1893303B CN200510082678XA CN200510082678A CN1893303B CN 1893303 B CN1893303 B CN 1893303B CN 200510082678X A CN200510082678X A CN 200510082678XA CN 200510082678 A CN200510082678 A CN 200510082678A CN 1893303 B CN1893303 B CN 1893303B
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link
power
traffic channel
overload
quality
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CN200510082678XA
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CN1893303A (en
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李欣
刘学敏
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ZTE Corp
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ZTE Corp
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Abstract

The invention discloses method for controlling power over loading. The method includes steps: when system over loading occurs, base station obtains current transmission power in each forward service channel; collecting parameters of reflecting quality of wireless link, and dividing link of each forward service channel into several levels based on the quality; the better of quality, the higher level is; based on the level of link of each forward service channel, setting up upper limit of transmission power for each channel, the higher level of the link, the larger difference between upper limit of transmission power and current transmission power will be setup. Thus, when system over loading occurs, the method guarantees normal telephony for better link first. Releasing bad link to moderate over loading situation effectively, the method lowers system rate of call failure.

Description

A kind of power overload controlling method
Technical field
The present invention relates to a kind of power overload controlling method, refer to the forward power overload control method of cdma communication system especially.
Background technology
In CDMA mobile communication system, forward traffic channel can be set up with a plurality of travelling carriages simultaneously in the base station in sub-district.Each forward traffic channel takies certain base station power and guarantees normal communication.Along with increasing of travelling carriage number in the sub-district, forward direction total transmitting power in base station increases, when total transmitting power surpasses the predetermined power-handling capability in base station, will make base station equipment be operated in non-optimum state even abnormal condition, and can not guarantee the percentage number of the shared total transmitting power of forward pilot to cause problems such as covering, switching, also can increase interference to the wireless environment of successive bands, therefore, it is very important the forward emitting power of base station being transshipped control.
Common power overload control mode has the new travelling carriage of base station limits to insert, and removes high-rate traffic channel, and the restriction soft handover is carried out or the like, and particularly when serious overload appears in system, the base station will forbid that all forward traffic channel power raise.Specifically, the transmitting power of each forward traffic channel of base station limits is at scope [PTX_Min, PTX_Max] (wherein PTX_Max is a upper limit of emission power, PTX_Min is a transmitting power lower limit) between, when serious overload appears in system, the upper limit of emission power PTX_Max that the base station will be provided with all forward traffic channels equals the current transmit power of this forward traffic channel, thereby forbids the rising of all forward traffic channel power.Though this mode can prevent overload, but for the good travelling carriage of forward link, its forward traffic channel transmitting power is lower, limit its transmitting power and raise this moment, if link is a little bit poorer a little, might cause this travelling carriage call drop, increased system's cutting off rate, because it is its transmitting power is very little, little behind the call drop again to the contribution that reduces system overload, so can not effectively alleviate overload.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of power overload controlling method, effectively alleviates the cutting off rate of overload conditions and reduction system.
In order to solve the problems of the technologies described above, basic thought of the present invention is: in when overload, by the quality of forward traffic channel place link its upper limit of emission power is set discriminatively, thereby reduces user's cutting off rate in effectively control overload.
Based on above-mentioned design, the invention provides a kind of power overload controlling method, may further comprise the steps:
When (a) overload appearred in system, the base station obtained the current transmit power of each forward traffic channel;
(b) gather the parameter that reflects the Radio Link quality, each forward traffic channel place link is divided into some ranks by its quality quality, quality is good more, and rank is high more;
(c) rank according to each forward traffic channel place link is provided with each channel transmitting power upper limit, and the rank of channel place link is high more, for the difference of the upper limit of emission power of its setting and its current transmit power big more.
Further, above-mentioned power overload controlling method also can have following characteristics: in the described step (b), the parameter of described reflection Radio Link quality is meant or its combination in the following parameter: overload is the current transmit power of forward traffic channel constantly, overload is the chip energy and the total received power spectrum density of Forward Pilot Channel constantly, and the current bit energy and the total noise power spectrum density of overload moment forward traffic channel.
Further, above-mentioned power overload controlling method also can have following characteristics: in the described step (b), be that the link with each forward traffic channel place is divided into two ranks by its quality, i.e. and measured link of matter and ropy link.
Further, above-mentioned power overload controlling method also can have following characteristics: in the described step (c), when forward direction Traffic Channel place link is the measured link of matter, its upper limit of emission power is set equals its current power value and add a default power adjustment.
Further, above-mentioned power overload controlling method also can have following characteristics: in the described step (c), when forward direction Traffic Channel place link is ropy link, its upper limit of emission power is set equals its current power value.
Further, above-mentioned power overload controlling method also can have following characteristics: in the described step (b), the parameter of described reflection Radio Link quality is meant the overload current transmit power of forward traffic channel constantly, if this current transmitting power less than or smaller or equal to the predetermined threshold value of system, then this forward traffic channel place link is the measured link of matter, otherwise this forward traffic channel place link is ropy link.
Further, above-mentioned power overload controlling method also can have following characteristics: in the described step (b), the parameter of described reflection Radio Link quality is meant the overload chip energy and the total received power spectrum density of Forward Pilot Channel constantly, if this chip energy and total received power spectral density value less than or smaller or equal to the predetermined threshold value of system, then the forward traffic channel place link of this Forward Pilot Channel correspondence is ropy link, otherwise the forward traffic channel place link of this Forward Pilot Channel correspondence is the measured link of matter.
Further, above-mentioned power overload controlling method also can have following characteristics: in the described step (b), the parameter of described reflection Radio Link quality is meant the overload current bit energy and the total noise power spectrum density of forward traffic channel constantly, if this bit energy and total noise power spectral density value less than or smaller or equal to the predetermined threshold value of system, then this forward traffic channel place link is the measured link of matter, otherwise this forward traffic channel place link is ropy link.
In sum, power overload controlling method provided by the invention, when overload appears in system, according to overload constantly the quality of each user chain quality each link upper limit of emission power is set respectively, make rise amount that its transmitting power of ropy link allows less than the measured link of matter.Like this, the rise amount that its transmitting power of the measured link of matter allows is bigger, thereby is difficult for call drop, has reduced user's cutting off rate.And ropy link is strict limited can't reach quality requirement the time because of transmitting power, travelling carriage will discharge this link, because ropy link transmitting power is all bigger, to reducing system overload bigger contribution is arranged behind the call drop, thereby can alleviate overload conditions effectively.
Description of drawings
Fig. 1 a is to be the flow chart that judgment condition is judged the quality of each user chain quality with forward direction Traffic Channel current transmit power.
Fig. 1 b is to be the fine or not flow chart that judgment condition is judged each user chain quality with Forward Pilot Channel EcIo.
Fig. 1 c is to be the fine or not flow chart that judgment condition is judged each user chain quality with forward direction Traffic Channel EbNt.
Fig. 2 determines the upper limit of emission power of each travelling carriage and then realizes the flow chart that power overload is controlled according to the quality of each user chain quality.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
When overload appearred in system, the quality of forward traffic channel place link was judged in the base station by the parameter of gathering reflection Radio Link quality.These parameters can be (1) overload current transmit power of forward traffic channel constantly; (2) overload moment Forward Pilot Channel chip energy and total received power spectrum density (EcIo); (3) the current bit energy and the total noise power spectrum density (EbNt) of overload moment forward traffic channel.
Be to be the flow chart that judgment condition is judged the quality of each user chain quality shown in Fig. 1 a, may further comprise the steps with forward direction Traffic Channel current transmit power:
Step 101 is gathered the overload current transmit power of forward traffic channel constantly;
Step 102, the threshold value that forward traffic channel current transmit power of relatively obtaining and system are predetermined.In general, the measured Radio Link of matter uses less forward power just to be enough to satisfy communicating requirement, and ropy Radio Link needs bigger forward power to overcome path fading.Therefore, transmitting power is during greater than threshold value, execution in step 103; When transmitting power is less than or equal to threshold value, execution in step 104;
Step 103, it is ropy link that this forward traffic channel place link is set;
Step 104, it is the measured link of matter that this forward traffic channel place link is set.
Described threshold value is the transmission power level of the good link boundary of link of poor quality and quality, and such as value 0.9w, then the transmitting power of Cai Jiing is the measured link of matter less than the link of 0.9w, and the transmitting power of collection is ropy link greater than the link of 0.9w.
Be to be the flow chart that judgment condition is judged the quality of each user chain quality shown in Fig. 1 b, may further comprise the steps with Forward Pilot Channel EcIo:
Step 105, the EcIo of the Forward Pilot Channel that the collection overload is constantly corresponding with forward traffic channel;
Step 106, the threshold value that the EcIo of the Forward Pilot Channel that relatively obtains and system are predetermined.Forward Pilot Channel and forward traffic channel are that binding sends, and the path fading of both processes is identical.Therefore, the EcIo of Forward Pilot Channel is the link-quality that can reflect forward traffic channel, and the big more wireless environment that shows of EcIo is good.Therefore, EcIo is during greater than threshold value, execution in step 107; When EcIo is less than or equal to threshold value, execution in step 108;
Step 107, it is the measured link of matter that this forward traffic channel place link is set;
Step 108, it is ropy link that this forward traffic channel place link is set.
Described threshold value is the EcIo value of the good link of link of poor quality and quality boundary, such as value is-5dB, and then the EcIo of Cai Jiing is ropy link less than the link of-5dB, and collection EcIo is the measured link of matter greater than the link of-5dB.
Be to be the flow chart that judgment condition is judged the quality of each user chain quality shown in Fig. 1 c, may further comprise the steps with forward direction Traffic Channel EbNt:
Step 109 is gathered the overload EbNt of forward traffic channel constantly;
Step 110, the threshold value that EbNt that the forward traffic channel that relatively obtains is current and system are predetermined, the measured Radio Link of matter just can satisfy communication quality under less EbNt, and ropy Radio Link could satisfy communication quality under bigger EbNt.Therefore, EbNt is during greater than threshold value, execution in step 111; When EbNt is less than or equal to threshold value, execution in step 112;
Step 111, it is ropy link that this forward traffic channel place link is set;
Step 112, it is the measured link of matter that this forward traffic channel place link is set.
Described threshold value is the EbNt value of the good link boundary of link of poor quality and quality, and such as value 4dB, then the transmitting power of Cai Jiing is the measured link of matter less than the link of 4dB, and the transmitting power of collection is ropy link greater than the link of 4dB.
Shown in Figure 2 is to determine the upper limit of emission power of each travelling carriage and then realize the flow chart that power overload is controlled according to the quality of each user chain quality:
Step 21, when overload appearred in system, the base station obtained each forward traffic channel current transmit power, to calculate final upper limit of emission power PTX_Max;
Step 22 is gathered the parameter that reflects the Radio Link quality, judges the quality of each forward traffic channel place link-quality.Judge whether forward traffic channel place link is the measured link of matter, if, execution in step 24, otherwise, execution in step 23;
Step 23, the PTX_Max that this forward traffic channel is set equals its current transmitting power, finishes; The user power of promptly forbidding bad link raises, and this link will have influence on signal quality because of transmit power limited as continuing variation like this, and travelling carriage finds that signal quality does not reach in the time of will showing, will discharge this link, promptly causes conversation loss.Because ropy link transmitting power is all bigger, to reducing system overload bigger contribution is arranged behind the call drop, just can more effectively alleviate overload conditions, thereby reduce the cutting off rate of system effectively;
Step 24 is provided with its PTX_Max and equals its current transmitting power and add a power adjustment, finishes.This is because its transmitting power is lower, even call drop is also little to the contribution that reduces system overload, its PTX_Max is set to be equaled its current transmitting power and adds a power adjustment, if the unexpected variation of this link, its forward traffic channel also has the space of a rising, prevents this travelling carriage call drop under the still little situation of transmitting power.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, technical scheme of the present invention is made amendment or is equal to replacement, and do not break away from the spirit and scope of this religious name technical scheme, all should be encompassed in the middle of the claim scope of the present invention.
For example, though the foregoing description just is divided into two ranks with link, it is the good or ropy link of quality, but in another embodiment, the link-quality of forward traffic channel is divided into three ranks, simple method is that other parameter range relevant with link-quality of each grade is set, and the scope that falls into according to the actual detected value is judged its rank again.Then, the link of different stage is provided with the upper limit of its transmitting power by different modes, total principle also is to allow ropy link go offline earlier, allow bigger adjustment amount as best link, link allows medium adjustment amount preferably, and the link of difference does not allow adjustment amount or allow minimum adjustment amount (the inventive method also can be used) before reaching serious overload.This principle also is applicable to fully link-quality is divided among other more multi-level embodiment.
In another embodiment, when judging the quality of forward traffic channel place link according to the parameter of gathering, just do not judge according to single parameter, can consider a plurality of parameters simultaneously, as take all factors into consideration current transmitting power of forward traffic channel and EbNt value, these a plurality of parameters are computed weighted, compare with predetermined threshold value again, judge that like this quality of link also is fine.

Claims (8)

1. power overload controlling method may further comprise the steps:
When (a) overload appearred in system, the base station obtained the current transmit power of each forward traffic channel;
(b) gather the parameter that reflects the Radio Link quality, each forward traffic channel place link is divided into some ranks by its quality quality, quality is good more, and rank is high more;
(c) rank according to each forward traffic channel place link is provided with each channel transmitting power upper limit, the rank of channel place link is high more, for the difference of the upper limit of emission power of its setting and its current transmit power big more, the rank that is channel place link is high more, and its transmitting power adjustment amount is big more; Rank is low more, and its transmitting power adjustment amount is more little;
Wherein, the total principle of power overload control is: the link that quality is poor more goes offline more earlier.
2. power overload controlling method as claimed in claim 1 is characterized in that, in the described step (b), is that the link with each forward traffic channel place is divided into two ranks by its quality, i.e. measured link of matter and ropy link.
3. power overload controlling method as claimed in claim 2, it is characterized in that, in the described step (c), when forward direction Traffic Channel place link is the measured link of matter, its upper limit of emission power is set equals its current power value and add a default power adjustment.
4. power overload controlling method as claimed in claim 2 is characterized in that, in the described step (c), when forward direction Traffic Channel place link is ropy link, its upper limit of emission power is set equals its current power value.
5. power overload controlling method as claimed in claim 1, it is characterized in that, in the described step (b), the parameter of described reflection Radio Link quality is meant or its combination in the following parameter: overload is the current transmit power of forward traffic channel constantly, overload is the chip energy and the total received power spectrum density of Forward Pilot Channel constantly, and the current bit energy and the total noise power spectrum density of overload moment forward traffic channel.
6. power overload controlling method as claimed in claim 2, it is characterized in that, in the described step (b), the parameter of described reflection Radio Link quality is meant the overload current transmit power of forward traffic channel constantly, if this current transmitting power less than or smaller or equal to the predetermined threshold value of system, then this forward traffic channel place link is the measured link of matter, otherwise this forward traffic channel place link is ropy link.
7. power overload controlling method as claimed in claim 2, it is characterized in that, in the described step (b), the parameter of described reflection Radio Link quality is meant the overload chip energy and the total received power spectrum density of Forward Pilot Channel constantly, if this chip energy and total received power spectral density value less than or smaller or equal to the predetermined threshold value of system, then the forward traffic channel place link of this Forward Pilot Channel correspondence is ropy link, otherwise the forward traffic channel place link of this Forward Pilot Channel correspondence is the measured link of matter.
8. power overload controlling method as claimed in claim 2, it is characterized in that, in the described step (b), the parameter of described reflection Radio Link quality is meant the overload current bit energy and the total noise power spectrum density of forward traffic channel constantly, if this bit energy and total noise power spectral density value less than or smaller or equal to the predetermined threshold value of system, then this forward traffic channel place link is the measured link of matter, otherwise this forward traffic channel place link is ropy link.
CN200510082678XA 2005-07-08 2005-07-08 Power overloading control method Expired - Fee Related CN1893303B (en)

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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
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1384633A (en) * 2001-04-30 2002-12-11 华为技术有限公司 Dynamic capacity regulating method for CDMA communication system
CN1533193A (en) * 2003-03-24 2004-09-29 华为技术有限公司 Load control method of communication system and communicaton system and overload alarm device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1384633A (en) * 2001-04-30 2002-12-11 华为技术有限公司 Dynamic capacity regulating method for CDMA communication system
CN1533193A (en) * 2003-03-24 2004-09-29 华为技术有限公司 Load control method of communication system and communicaton system and overload alarm device

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