CN100395966C - Method of downlink outer loop power control for combined service - Google Patents
Method of downlink outer loop power control for combined service Download PDFInfo
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- CN100395966C CN100395966C CNB2005100238504A CN200510023850A CN100395966C CN 100395966 C CN100395966 C CN 100395966C CN B2005100238504 A CNB2005100238504 A CN B2005100238504A CN 200510023850 A CN200510023850 A CN 200510023850A CN 100395966 C CN100395966 C CN 100395966C
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Abstract
The present invention relates to the technical field of wireless communication, and discloses a method of downlink outer loop power control for combined services. The present invention causes that the BLER of at least one service in the combined services is converged in a BLER target of the combined services, the BLER of the other services is superior to or is equal to the BLER target, and thereby, the phenomena of drop-call and network break caused by downlink outer loop power control are avoided. By the present invention, the deviation between the QoS and the target value of multiple services in the combined service is comprehensively considered, the worst service of the QoS is taken as a controlled object for the power control, and thereby, the present invention avoids depending on unpredictable ideal power proportioning.
Description
Technical field
The present invention relates to wireless communication field, particularly the signal power control technology in the Wideband Code Division Multiple Access (WCDMA) communication system.
Background technology
Along with epoch and development of technology, human demand to mobility and information sharply rises, no matter when, where people wish, in the time of needs, just energy high speed access the Internet or intranet are sent and received e-mail, carry out ecommerce, swap file, fax and other data, thus oneself competitive advantage in social life improved, obtain a life style more flexibly.Present the 2nd third-generation mobile communication system can't satisfy people's requirement, thereby the substitute is Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access is called for short " WCDMA ") grade in an imperial examination 3 third-generation mobile communication technology.
WCDMA communication system support broadband services, can effectively support such as public switched telephone network (Public Switched Telephone Network, abbreviation " PSTN "), integrated services digital network (Integrated Services Digital Network, be called for short " ISDN ") etc. circuit switching (CircuitSwitching, be called for short " CS ") professional and such as internetworking protocol network (Internet ProtocolNetwork, be called for short " IP network ") wait grouping exchange (Packet Switching, abbreviation " PS ") business.Wireless protocols can be supported speech, data and multimedia service to same user simultaneously in a carrier wave flexibly.By transparent or non-transparent transmission piece support in real time, non-real-time service.
In the WCDMA system,, have nonideal correlation properties between user's the spreading code, so any one user is an interference source concerning other users because the user uses identical frequency band.If interference user is closely more a lot of apart from the base station than the targeted customer, even ignored the influence of decline, the path attenuation of signal also is directly proportional apart from the cube of the distance of base station with the user, then interference signal can be more a lot of greatly than the received power of targeted customer signal in the received power of base station, like this, the multiple access interference components just may be very serious in the output of tradition receiver, even can flood targeted customer's signal.This phenomenon is called as near-far interference.The influence of power control can reducing effectively near-far interference, it has become one of of paramount importance core technology in the third generation communication standard.The control of the power here, be exactly no matter the user from the distance of base station, when allowing all upward signals reach the antenna for base station mouth under the prerequisite that satisfies the target signal interference ratio, the user's terminal transmitting power minimum, thus make the self-interference minimum, obtain higher capacity.
Two kinds of Poewr control methods are generally arranged now: exterior ring power control and inner loop power control.Wherein, inner loop power control is divided into open Loop Power control and closed power control again.Closed power control can be divided into uplink closed loop and the control of downlink closed-loop power again.
Uplink closed loop refers to the base station and adjusts transmission power of mobile station with target signal to noise ratio up to specification (SIRTarget) according to the variation of received power; The control of downlink closed-loop power refers to travelling carriage and adjusts the transmitting power of base station with SIRTarget up to specification according to the variation of received power.
In addition, the basic principle of open Loop Power control is to be the principle of constant according to the long-pending of user's received power and transmitting power, measures the size of received power in advance, and determines the size of transmitting power thus.Open Loop Power control is used for determining user's Initial Trans, or the transmission power adjustment of user's received power when undergoing mutation.Open Loop Power control reckons without the asymmetry of uplink and downlink channel electric wave power, thereby its accuracy is difficult to be guaranteed, so in WCDMA, the basic solution of power control is that closed power control and exterior ring power are controlled.
Closed power control can solve the problem of open Loop Power control preferably.In closed power control, the signal to noise ratio of the estimating received signal that base station/travelling carriage is frequent (Signal to Interference Ratio is called for short " SIR "), and compare with SIRTarget.If the SIR that estimates is greater than SIRTarget, base station/travelling carriage will send the order of falling power to travelling carriage/base station, otherwise base station/travelling carriage will send the order of power per liter to travelling carriage/base station.
In WCDMA, external circule power control is exactly to guarantee that by the SIRTarget that adjusts inner loop power control communication reaches certain service quality (Quality of Service is called for short " QoS ").If channel quality is better than QoS, just reduces SIRTarget, otherwise improve SIRTarget.Here, QoS generally uses Block Error Rate (BLER), bit error rate (BER) or frame error rate (FER) to weigh.
For the control of downlink outer loop power, travelling carriage (User Equipment is called for short " UE ") guarantees channel quality by the SIRTarget that adjusts descending inner-loop power control.In this article, suppose all to weigh QoS with BLER.For simple CS business, or simple PS business, UE will calculate SIRTarget according to BLER desired value (BLERTarget) and current BLER value, and then carry out the control of downlink outer loop power.This have only the downlink outer loop power control ratio of CS business or PS business simpler, but for the composite service that has mixed CS business and PS business, situation will more complicated.
In the prior art, downlink outer loop power control for composite service, UE only calculates that higher professional BLER of qos requirement, in real time with previously selected professional BLERTarget relatively and calculate SIR Target, and then carry out the control of downlink outer loop power.For example, suppose to have a composite service, the QoS desired value of its CS business is set to 1%, and the QoS desired value of PS business is set to 6%, and its downlink outer loop power control is just carried out according to the QoS of CS business simply so.
In actual applications, there is following problem in such scheme: in composite service, the descending BLER of a certain business converges on this professional BLERTarget, and the descending BLER of another business its BLERTarget head and shoulders above, cause quality of service to worsen, even cause call drop and fall net.That is to say that prior art can't guarantee that CS BLER professional and the PS business reaches simultaneously to converge on the BLER desired value or be better than the BLER desired value in the control of the downlink outer loop power of composite service.
This can be specifically described by following Example: suppose a composite service, the descending BLER Target of its CS business is 1%, and the descending BLER Target of PS business is 6%; The downlink outer loop power control of this moment is only carried out according to the CS business.This result who causes is: the descending BLER of CS business is 0.98%, can converge on 1%, and the descending BLER of PS business has reached 20% at this moment.Because the descending BLER of PS business is too high, causes link to tear chain open, communication can't be carried out.
Cause the main cause of this situation to be, in the prior art, when composite service is carried out power control, its power ratio is according to set point and fixing, but the ideal power proportioning under the varying environment is different, the translational speed of travelling carriage for example, the relative position of travelling carriage and adjacent base station, geographical environment on every side, weather etc. all can influence the ideal power proportioning at that time.Power ratio according to certain environment setting can be fit to all environment scarcely, when environment changes, only a certain business is carried out power control, can cause another professional BLER to become unpredictable.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of downlink outer loop power control of composite service, make that one of them professional BLER converges on its BLERTarget in the composite service, other professional BLER is better than equaling its BLERTarget, thereby avoids falling because of the call drop that the downlink outer loop power control causes the generation of net phenomenon.
For achieving the above object, the invention provides a kind of method of downlink outer loop power control of composite service, described composite service comprises at least two can be by the business of downlink outer loop power control break service quality, and described method comprises following steps:
Party A-subscriber's equipment calculates the Service Quality Metrics in each described business respectively;
B with its corresponding Service Quality Metrics desired value of the Service Quality Metrics of each described business relatively, select Service Quality Metrics with respect to the relatively poor business of self corresponding Service Quality Metrics desired value as controlling object, calculate the target signal interference ratio, realize the control of downlink outer loop power.
Wherein, described composite service comprises circuit-switched service and packet switching service.
Among the described step B,
Service Quality Metrics in described circuit-switched service is inferior to its Service Quality Metrics desired value, and the Service Quality Metrics in the described packet switching service is when being better than its Service Quality Metrics desired value, execution in step B1;
Service Quality Metrics in described circuit-switched service is better than its Service Quality Metrics desired value, and the Service Quality Metrics in the described packet switching service is inferior to its Service Quality Metrics desired value, execution in step B2;
Service Quality Metrics in described circuit-switched service is inferior to its Service Quality Metrics desired value, when the Service Quality Metrics of described packet switching service is inferior to its Service Quality Metrics desired value, judge Service Quality Metrics in the described circuit-switched service and the skew real number value between its Service Quality Metrics desired value, whether bigger with respect to the skew real number value between the Service Quality Metrics in the described packet switching service and its Service Quality Metrics desired value, if, execution in step B1 then, otherwise carry out B2;
Service Quality Metrics in described circuit-switched service is better than its Service Quality Metrics desired value, the Service Quality Metrics of described packet switching service is better than its Service Quality Metrics desired value, judge Service Quality Metrics in the described circuit-switched service and the skew real number value between its Service Quality Metrics desired value, whether bigger with respect to the skew real number value between the Service Quality Metrics in the described packet switching service and its Service Quality Metrics desired value, if, execution in step B2 then, otherwise carry out B1;
B1 as controlling object, calculates the target signal interference ratio with described circuit-switched service, realizes the control of downlink outer loop power;
B2 as controlling object, calculates the target signal interference ratio with described packet switching service, realizes the control of downlink outer loop power.
Among the described step B, the result according to (Service Quality Metrics-corresponding Service Quality Metrics desired value)/corresponding Service Quality Metrics desired value judges bias size.
Described Service Quality Metrics is the error rate, Block Error Rate or frame error rate.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, the present invention has taken all factors into consideration the QoS of multiple business in the composite service and the deviation of its desired value, always with the controlling object of the poorest business of QoS as power control, avoided dependence to unpredictable ideal power proportioning, making can have the QoS of a business to converge on its desired value in the composite service, and another professional QoS is better than equaling its desired value.
Difference on this technical scheme has brought comparatively significantly beneficial effect, has prevented that promptly certain professional QoS far is worse than the situation of desired value in the composite service, thereby has avoided falling because of the call drop that the control of downlink outer loop power causes the generation of net phenomenon.
Description of drawings
Fig. 1 is the schematic flow sheet of the method for downlink outer loop power control of composite service according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Generally speaking, the present invention has taken all factors into consideration the QoS of two kinds of business and the deviation of its desired value in the composite service, choose be worse than desired value or with the controlling object of the bigger business of desired value skew as power control.
The flow process of the downlink outer loop power control of composite service is described below in conjunction with accompanying drawing 1.
At first, carry out step 101, the descending BLER that UE obtains the CS business respectively (is called for short " BLER
CS") and the descending BLER of PS business (be called for short " BLER
PS").Though in the present embodiment only with the standard of BLER as measurement QoS, therefore only need obtain BLER, but those of ordinary skill in the art are appreciated that the criterion of QoS and can be a kind of or various combinations among BLER, BER, the FER, and do not influence the spirit and scope of the invention.
Then, enter step 102, judge the BLER of CS business in the composite service
CSWhether be inferior to its desired value BLERTarget
CS, and the BLER of PS business
PSWhether be better than its desired value BLERTarget
PSIf, then explanation this moment the CS business QoS be worse than desired value and the QoS of PS business is better than desired value, therefore enter step 105, be the controlling object of power control with the CS business, calculate SIRTarget, realize the control of downlink outer loop power; Otherwise enter step 103, do further to judge.
In step 103, judge the BLER of CS business in the composite service
CSWhether be better than its desired value BLERTarget
CS, and the BLER of PS business
PSWhether be inferior to its desired value BLERTarget
PSIf, then explanation this moment the CS business QoS be better than desired value and the QoS of PS business is worse than desired value, therefore enter step 106, be the controlling object of power control with the PS business, calculate SIRTarget, realize the control of downlink outer loop power; Otherwise enter step 104, do further to judge.
In step 104, judge the BLER of CS business
CSWith BLERTarget
CSDeviant whether than the BLER of PS business
PSWith BLERTarget
PSDeviant big, if, then enter step 105, be the controlling object of power control with the CS business; Otherwise enter step 106, with
PSProfessional controlling object for power control.
Need to prove, according to principle of the present invention, the QoS of need consideration PS business and CS business and its be the deviation of desired value separately, choose business desired value or bigger with desired value skew that is worse than, just Qos is with respect to the relatively poor business of self corresponding desired value, as the controlling object of power control.Because in the present embodiment, with BLER as the standard of weighing QoS, and in above-mentioned steps to the BLER of CS business
CSBe inferior to BLERTarget
CS, and the BLER of PS business
PSBe better than BLERTarget
PSSituation, and the BLER of CS business
CSBe better than BLERTarget
CS, and the BLER of PS business
PSBe inferior to BLERTarget
PSSituation done corresponding processing.Therefore this step at be BLER when the CS business
CSBe inferior to BLERTarget
CS, and the BLER of PS business
PSBe inferior to BLERTarget
PSSituation, perhaps as the BLER of CS business
CSBe better than BLERTarget
CS, and the BLER of PS business
PSBe better than BLERTarget
PSSituation.
In this case, need the relatively BLER of CS business
CSWith BLERTarget
CSDeviant and the BLER of PS business
PSWith BLERTarget
PSThe size of deviant.
The described deviant of this step, specifically calculate by following formula: (BLER-BLERTarget)/BLERTarget.As mentioned above, after through step 102 and step 103, only have following two kinds of situations in the step 104: 1) BLER
CSBe inferior to and equal BLERTarget
CS, and BLER
PSBe inferior to and equal BLERTarget
PS2) BLER
CSBe better than equaling BLERTarget
CS, and BLER
PSBe better than equaling BLERTarget
PSAny situation no matter, all with the bigger the sort of business of deviant, just Qos is with respect to the relatively poor business of self corresponding desired value, as the controlling object of power control.It is worth mentioning, be not to compare herein, but compare with real number value with absolute figure.
Below in conjunction with two preferred embodiments this step is described further.
In first embodiment, suppose:
BLER
CS＝1.2％，BLERTarget
CS＝1％；
BLER
PS＝6.2％，BLERTarget
PS＝6％。
This belongs to first kind of situation in the step 104.Because
(BLER
CS-BLERTarget
CS)/BLERTarget
CS=0.2, and
(BLER
PS-BLERTarget
PS)/B?LERTarget
PS＝0.2/6，
The deviant that is the CS business is bigger, so select the controlling object of CS business as power control.
In second embodiment, suppose:
BLER
CS＝0.8％，BLERTarget
CS＝1％；
BLER
PS＝5.8％，BLERTarget
PS＝6％。
This belongs to second kind of situation in the step 104.Because
(BLER
CS-BLERTarget
CS)/BLERTarget
CS=-0.2, and
(BLER
PS-BLERTarget
PS)/BLERTarget
PS＝-0.2/6，
The deviant that is the PS business is bigger, so select the controlling object of PS business as power control.
Need to prove, though the present invention is the method for downlink outer loop power control that composite service is described as an example with CS and PS business, and those skilled in the art can know, can be not limited to this CS and PS, the combination of other business can be suitable for too, and the combination of a plurality of business can be suitable for too.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (5)
1. the method for downlink outer loop power control of a composite service is characterized in that, described composite service comprises at least two can be by the business of downlink outer loop power control break service quality, and described method comprises following steps:
Party A-subscriber's equipment calculates the Service Quality Metrics in each described business respectively;
B with its corresponding Service Quality Metrics desired value of the Service Quality Metrics of each described business relatively, select Service Quality Metrics with respect to the relatively poor business of self corresponding Service Quality Metrics desired value as controlling object, calculate the target signal interference ratio, realize the control of downlink outer loop power.
2. the method for downlink outer loop power control of composite service according to claim 1 is characterized in that, described composite service comprises circuit-switched service and packet switching service.
3. the method for downlink outer loop power control of composite service according to claim 2 is characterized in that, among the described step B,
Service Quality Metrics in described circuit-switched service is inferior to its Service Quality Metrics desired value, and the Service Quality Metrics in the described packet switching service is when being better than its Service Quality Metrics desired value, execution in step B1;
Service Quality Metrics in described circuit-switched service is better than its Service Quality Metrics desired value, and the Service Quality Metrics in the described packet switching service is inferior to its Service Quality Metrics desired value, execution in step B2;
Service Quality Metrics in described circuit-switched service is inferior to its Service Quality Metrics desired value, when the Service Quality Metrics of described packet switching service is inferior to its Service Quality Metrics desired value, judge Service Quality Metrics in the described circuit-switched service and the skew real number value between its Service Quality Metrics desired value, whether bigger with respect to the skew real number value between the Service Quality Metrics in the described packet switching service and its Service Quality Metrics desired value, if, execution in step B1 then, otherwise carry out B2;
Service Quality Metrics in described circuit-switched service is better than its Service Quality Metrics desired value, the Service Quality Metrics of described packet switching service is better than its Service Quality Metrics desired value, judge Service Quality Metrics in the described circuit-switched service and the skew real number value between its Service Quality Metrics desired value, whether bigger with respect to the skew real number value between the Service Quality Metrics in the described packet switching service and its Service Quality Metrics desired value, if, execution in step B2 then, otherwise carry out B1;
B1 as controlling object, calculates the target signal interference ratio with described circuit-switched service, realizes the control of downlink outer loop power;
B2 as controlling object, calculates the target signal interference ratio with described packet switching service, realizes the control of downlink outer loop power.
4. the method for downlink outer loop power control of composite service according to claim 3, it is characterized in that, among the described step B, the result according to (Service Quality Metrics-corresponding Service Quality Metrics desired value)/corresponding Service Quality Metrics desired value judges bias size.
5. according to the method for downlink outer loop power control of each described composite service in the claim 1 to 4, it is characterized in that described Service Quality Metrics is the error rate, Block Error Rate or frame error rate.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100238504A CN100395966C (en) | 2005-02-05 | 2005-02-05 | Method of downlink outer loop power control for combined service |
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| CNB2005100238504A CN100395966C (en) | 2005-02-05 | 2005-02-05 | Method of downlink outer loop power control for combined service |
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| CN100395966C true CN100395966C (en) | 2008-06-18 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6553006B1 (en) * | 1998-08-10 | 2003-04-22 | Nokia Mobile Phones Limited | Resource allocation in packet-format data transmission |
| CN1457203A (en) * | 2002-05-07 | 2003-11-19 | 埃沃列姆公司 | External ring method and apparatus for controlling adjustable power and internal ring desired value |
| US20040008639A1 (en) * | 2001-01-17 | 2004-01-15 | Tetsuya Yano | Outer-loop power control device and method thereof |
| CN1489835A (en) * | 2001-02-02 | 2004-04-14 | ����ɭ�绰�ɷ�����˾ | Method and system for receiver-charactorized power setting in cellular communication system |
| WO2004049589A1 (en) * | 2002-11-26 | 2004-06-10 | Interdigital Technology Corporation | Outer loop power control for wireless communication systems |
-
2005
- 2005-02-05 CN CNB2005100238504A patent/CN100395966C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6553006B1 (en) * | 1998-08-10 | 2003-04-22 | Nokia Mobile Phones Limited | Resource allocation in packet-format data transmission |
| US20040008639A1 (en) * | 2001-01-17 | 2004-01-15 | Tetsuya Yano | Outer-loop power control device and method thereof |
| CN1489835A (en) * | 2001-02-02 | 2004-04-14 | ����ɭ�绰�ɷ�����˾ | Method and system for receiver-charactorized power setting in cellular communication system |
| CN1457203A (en) * | 2002-05-07 | 2003-11-19 | 埃沃列姆公司 | External ring method and apparatus for controlling adjustable power and internal ring desired value |
| WO2004049589A1 (en) * | 2002-11-26 | 2004-06-10 | Interdigital Technology Corporation | Outer loop power control for wireless communication systems |
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