CN100454799C - A power control method for code division multiple access communication system - Google Patents
A power control method for code division multiple access communication system Download PDFInfo
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- CN100454799C CN100454799C CNB021441774A CN02144177A CN100454799C CN 100454799 C CN100454799 C CN 100454799C CN B021441774 A CNB021441774 A CN B021441774A CN 02144177 A CN02144177 A CN 02144177A CN 100454799 C CN100454799 C CN 100454799C
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Abstract
The present invention provides a power controlling method for a CDMA (code division multiple access) communication system, which is used for achieving the purpose of burst data service/power control. Signal-to-noise ratios of public information in a period of private data information transmission of a user are measured and compared to form public information transmission power control command values (TPC command values) which are accumulated to form TPC command accumulated values. A control base station transmits information frame time transmission power which carries user private data information and needs to be transmitted to realize the fading and the path loss of an approximately continuous tracking channel. The present invention can not only maintain communication with high quality, but also generate no interference in other users, and overcomes the limitations which are generated when a down closed loop power controlling method existing in the prior art is applied to burst data service.
Description
Technical field
The present invention relates to the Poewr control method of wireless communication system, relate in particular to the Poewr control method on a kind of code division multiple address communication system down link.
Background technology
Code division multiple access (CDMA) communication system is a self-interference system, all mobile subscribers take same band and frequency, the interior at one time code division multiplexing of different user, the interference of intersymbol is very serious, and channel fading and multipath disturb more obvious to the restriction of power system capacity.Power control techniques can reasonablely overcome the above problems, and makes system can safeguard high quality communication, other users is not produced interference again, is one of very important key technology in cdma communication system.
Power control divides uplink power control and descending power control.Uplink power control has important effect for eliminating near-far interference, and descending power control then can reduce the average transmitting power of base station, thereby reduces the interference to adjacent sub-district, increases the available resource of down link.Descending power control only can be divided into the downlink closed-loop power control that the descending open Loop Power control that participated in by travelling carriage and travelling carriage, base station participate in simultaneously.When the multiple users share downlink resource,, for improving usage factor of system resource, reduce to have disturbed sizable benefit so if use power control techniques.
The basic skills of traditional downlink closed-loop power control is exactly that travelling carriage receives DPCH (DPCH, Dedicated Physical Channel) after, measure its sir measurement value " SIRest value ", and compare with target signal to noise ratio SIRtar value, if SIRest＞SIRtar, it is more than needed to illustrate that performance that power that the base station sends requires for UE has, and this moment, UE sent " down " order to the base station, allowed the base station reduce transmitted power; Otherwise, SIRest＜SIRtar, then UE sends " up " order to the base station, allows the base station improve transmitted power.A this past communication control process that returns continuously is called the control of downlink closed-loop power.Wherein target signal to noise ratio SIRtar value is passed down by high level.
This traditional close-loop power controlling method requires DPCH channel transmitting subscriber information continuously, travelling carriage could be shot the arrow at the target like this, every frame can both measure SIRest, and then forms the TPC command value, and power control just can be played the function of compensate for channel decline and path loss.
Because in traditional communication system, mainly serve voice service, promptly in communication process, link is in connected state always, more than this traditional Poewr control method can satisfy business demand.But along with the develop rapidly data communication service of communication has inevitable development trend, the sudden characteristics of its data transmission service, can not guarantee that the every frame of user all has professional the reception, be that the multi-user is can not use downlink resource continuously the time, closed power control can't be carried out like this, thereby traditional downlink closed-loop power control algorithm can not satisfy the development of present data service communication.
Summary of the invention
The object of the present invention is to provide the method for controlling downlink power when the transmitting burst data service.By this Poewr control method, the precision of power control can be provided, reduce the average transmitting power of base station effectively, thereby reduce interference adjacent sub-district, improve the service efficiency of downlink resource.
In the present invention is to realize by the technical scheme that following steps are formed:
(1) user judges whether the information frame that the base station sends carries customer-specific data information;
(2) if do not carry customer-specific data information, the user measures and preserves the public information signal to noise ratio that this information frame transmits, and enters step (4); Otherwise, enter step (3);
(3) user measures the signal to noise ratio of this customer-specific data information, compares with target signal to noise ratio, and to obtain transmission power control instruction be the TPC command value and be uploaded to the base station, and the user preserves this TPC command value, enters step (5);
(4) user judges further whether the last information frame of this information frame carries customer-specific data information, if last information frame carries and does not have customer-specific data information, user relatively this information frame transmits the signal to noise ratio of public information and the signal to noise ratio that last information frame transmits public information, obtain the TPC command value, upload the base station; Otherwise the user uploads the TPC command value of last information frame to the base station;
(5) after the base station receives the TPC command value that transmits on the user, whether the information frame of determining this TPC command value correspondence carries customer-specific data information, if do not carry customer-specific data information, add up the TPC command value that receives and form TPC instruction accumulated value in the base station, when treating to carry subsequently the customer-specific data information frame and need transmit, adjust the base station with this TPC instruction accumulated value and transmit the transmitting power that this carries the customer-specific data information frame; Otherwise when treating that the base station determines that carrying the customer-specific data information frame subsequently need transmit, the base station is directly adjusted the base station with the TPC command value that receives and is transmitted the transmitting power that this carries the customer-specific data information frame.
In the above-mentioned steps (4) when last information frame does not carry customer-specific data information the formation of TPC command value may further comprise the steps:
(a) this information frame transmits the signal to noise ratio of the signal to noise ratio of public information greater than last information frame transmission public information, and the TPC command value of then uploading the base station in last information frame adds that a step-length obtains this information frame TPC command value;
(b) this information frame transmits the signal to noise ratio of the signal to noise ratio of public information less than last information frame transmission public information, and the TPC command value of then uploading the base station in last information frame deducts a step-length and obtains this information frame TPC command value;
(c) signal to noise ratio of this information frame transmission public information equals the signal to noise ratio that last information frame transmits public information, and then this information frame TPC command value is for to upload the TPC command value of base station at last information frame.
Arbitrary information frame that base station described in the above-mentioned steps sends the user to all carries public information.
The inventive method can also realize by the technical scheme of being made up of following steps:
(1) system is provided with the predetermined interval phase that the user uploads public information TPC instruction accumulated value to the base station, and the predetermined interval phase is less than transmitting for two intervals of carrying customer-specific data information frame;
(2) user judges whether the information frame that receives carries customer-specific data information;
(3) if do not carry customer-specific data information, the user measures and preserves the public information signal to noise ratio that transmits by this information frame, enters step (5); Otherwise enter step (4)
(4) user measures the signal to noise ratio of this customer-specific data information, compares with target signal to noise ratio, obtains the TPC command value and is uploaded to the base station, and the user preserves this TPC command value, enters step (7);
(5) user judges further whether the last information frame of this information frame carries customer-specific data information, if last information frame carries customer-specific data information, and user's TPC command value of last information frame that adds up then; Otherwise user relatively this information frame transmits the signal to noise ratio of public information and the signal to noise ratio of last information frame transmission public information, obtains the TPC command value and adds up;
(6) user uploads TPC instruction accumulated value through the predetermined interval phase to the base station;
(7) after the base station receives and preserves the TPC command value or TPC instruction accumulated value that transmits on the user, to be determined when carrying the customer-specific data information frame subsequently and need transmit, adjust the base station with this TPC command value and send the transmitting power that this carries the customer-specific data information frame.
Arbitrary information frame that base station described in the above-mentioned steps sends the user to all carries public information.
In the wherein said step (5) when last information frame does not carry customer-specific data information the formation of TPC command value may further comprise the steps:
(a) this information frame transmits the signal to noise ratio of the signal to noise ratio of public information greater than last information frame transmission public information, and the TPC command value of then uploading the base station in last information frame adds that a step-length obtains this information frame TPC command value;
(b) this information frame transmits the signal to noise ratio of the signal to noise ratio of public information less than last information frame transmission public information, and the TPC command value of then uploading the base station in last information frame deducts a step-length and obtains this information frame TPC command value;
(c) signal to noise ratio of this information frame transmission public information equals the signal to noise ratio that last information frame transmits public information, and then this information frame TPC command value is for to upload the TPC command value of base station at last information frame.
The main distinction that realizes above-mentioned two kinds of methods of the present invention is: during the continuous transmission that the information frame that only carries public information is arranged, first method is to finish the cumulative process of public information TPC command value in base station side, and the user is returning the up signaling of TPC command value continuously; Second method is to finish adding up of public information TPC command value at user side, and uploads TPC instruction accumulated value interval through systemic presupposition.
The present invention measures the signal to noise ratio that exclusive data information transmits the interim public information by the user, and compare and form the TPC instruction, and this TPC command value added up form TPC instruction accumulated value, when having treated that customer-specific data information need transmit, adjust the transmitted power of base station with this TPC instruction accumulated value, thereby realize the decline and the path loss of approximate continuous tracking channel, can safeguard high quality communication, other users are not produced interference again, overcome the limitation that power control method for downward closed loop of the prior art is applied in the professional aspect of this burst data.
Description of drawings
By below in conjunction with the description of accompanying drawing to preferred embodiment of the present invention, can further understand all types of target of the present invention, advantage and characteristics, wherein:
Fig. 1 is the power control signaling process figure that forms public information TPC instruction accumulated value in base station side according to of the present invention;
Fig. 2 is the power control signaling process figure that forms public information TPC instruction accumulated value at user side according to of the present invention.
Embodiment
When the present invention is used for having between user and the base station burst service to transmit, when promptly having discontinuous transmissions of customer-specific data information, and public information situation of transmission continuously in every information frame.
Fig. 1 is the signaling process figure of the nearly closed power control of the discontinuous downstream data traffic of base station side processing, for the sake of clarity, only is assumed to be intrasystem mobile subscriber A (UE A) is carried out power control.
This preferred embodiment is to realize downlink power is controlled by following steps:
(1) base station (NodeB) transmits customer-specific data information and gives user A (UE A) in first information frame;
(2) user A receives the signal to noise ratio (SIR1) of measuring this data message after the customer-specific data information, and compares with target signal to noise ratio, draws the TPC1 command value, and is uploaded to the base station, and the TPC1 of user A storage simultaneously command value is in user memory;
(3) base station receives after the TPC1 command value, and definite second information frame subsequently carries customer-specific data information and waits to transmit, and transmits the second information frame transmitting power so the base station is adjusted with the TPC1 command value in the base station;
(4) user A judges received second information frame and carries customer-specific data information, repeat above-mentioned steps (2), promptly, measure the signal to noise ratio (being assumed to be SIR2) of customer-specific data information, and compare with target signal to noise ratio, draw the TPC2 command value, and be uploaded to the base station, user A upgrades the TPC1 command value with the TPC2 command value in user memory simultaneously;
(5) base station receives after the TPC2 command value that transmits on the user A, determines that the 3rd information frame does not have customer-specific data information to wait to transmit, and transmits the information frame that only carries public information a and gives user A;
(6) user A judges the 3rd information frame that receives and does not carry customer-specific data information, measure the signal to noise ratio (being assumed to be SIRa) of the public information a of this frame transmission, upload the TPC2 that stores in the user memory and instruct, and in user memory, upgrade the TPC2 instruction with this public information signal to noise ratio SIRa to the base station;
(7) base station receives after the TPC2 command value that transmits on the user A, confirm not carry in the 3rd information frame customer-specific data information, this TPC2 command value of storage in the accumulator of base station, judging base station side the 4th information frame to be transmitted does not simultaneously have customer-specific data information yet, transmits the information frame that only carries public information b and gives user A;
(8) user A judges received the 4th information frame does not have customer-specific data information, measure the signal to noise ratio (being SIRb) of received public information b, compare with the 3rd frame public information a signal to noise ratio SIRa that stores in the user memory, SIRb is greater than SIRa, draw TPC3 command value than TPC2 1 step-length of rising (step), upload the TPC3 command value and give the base station, and in user memory, upgrade the signal to noise ratio SIRa of the 3rd information frame public information a with this SIRb;
(9) base station receives the TPC3 command value that transmits on the user A, confirm that the 4th frame does not have customer-specific data information to transmit, in the base station side accumulator, TPC3 command value and TPC2 command value added up and obtain TPC instruction accumulated value (TPC2+TPC3), judge base station side the 5th frame to be transmitted simultaneously and carry customer-specific data information, adjust base station transmitting power with base station side TPC instruction accumulated value (TPC2+TPC3);
(10) user A judges received the 5th frame information and carries customer-specific data information, and compares with target signal to noise ratio, draws the TPC4 command value, and is uploaded to the base station, and the TPC4 of user A storage simultaneously command value is in user memory.
So analogize, in each information frame that transmit base station afterwards, if carry the exclusive data information of user A oneself, then measure the signal to noise ratio of this data message, and compare and then form the TPC command value, report the base station with target signal to noise ratio.
In the present embodiment, two carry the transmission of customer-specific data information frame during, finish the cumulative process of public information TPC command value in base station side.
Fig. 2 is the signaling process figure in the nearly closed power control of the discontinuous downstream data traffic of user side processing, this embodiment is the another one preferred embodiment that realizes the inventive method, and this embodiment realizes the power of down link is controlled by following steps:
(1) system is provided with user (UE A) uploads public information TPC instruction accumulated value to base station (NodeB) the predetermined interval phase (being assumed to be 1 information frame);
(2) after user A receives the first information frame of the customer-specific data information that carries that sends from the base station, measure the signal to noise ratio (SIR1) of this data message, and compare with target signal to noise ratio, draw the TPC1 command value, and being uploaded to the base station, user A stores the TPC1 command value in the user side accumulator simultaneously;
(3) base station receives after the TPC1 command value, determine second information frame to be transmitted and carry customer-specific data information, the base station is directly adjusted base station transmitting power with the TPC1 command value and is transmitted second information frame, simultaneously in this TPC1 command value of base station side memory stores;
(4) user A receives customer-specific data information, measures the signal to noise ratio (being assumed to be SIR2) of this customer-specific data information, and compares with target signal to noise ratio, draw the TPC2 command value, and being uploaded to the base station, user A side accumulator zero clearing simultaneously deposits the TPC2 command value that newly obtains in;
(5) base station receives after the TPC2 command value that transmits on the user A, detecting does not have customer-specific data information to wait to transmit in the 3rd information frame, transmit the information frame that only carries public information a and give user A, use the TPC2 command value in base station side memory updating TPC1 command value;
(6) user A receives the 3rd information frame that only carries public information, measures the signal to noise ratio (being assumed to be SIRa) of the public information a that transmits in this frame, and is stored in the user side memory;
(7) base station is transmitted the 4th information frame that only carries public information and is given user A;
(8) user A receives the 4th information frame that only carries public information b, measure this public information signal to noise ratio (being assumed to be SIRb), compare with the 3rd frame public information signal to noise ratio SIRa that stores in the user memory, draw the TPC3 command value, add up with the TPC2 command value of storing in the user A side accumulator and to obtain TPC instruction accumulated value (TPC2+TPC3), this TPC instruction accumulated value is uploaded to the base station, and in user memory, upgrades SIRa with SIRb;
(9) base station receives TPC instruction accumulated value (TPC2+TPC3), detecting the 5th frame does not have customer-specific data information to wait to transmit, transmit the information frame that only carries public information c and give user A, instruct accumulated value (TPC2+TPC3) in base station side memory updating TPC2 command value with TPC simultaneously;
(10) user A receives the 5th information frame that only carries public information c, measures this frame public information signal to noise ratio (being assumed to be SIRc), and upgrades the 4th frame public information signal to noise ratio SIRb in the user side memory with SIRc;
(11) base station detects the 6th information frame to be transmitted and carries customer-specific data information, adjusts base station transmitting power with the TPC instruction accumulated value (TPC2+TPC3) of base station side memory stores.
In the present embodiment, transmitting customer-specific data information between the rest periods, the user measures the signal to noise ratio of public information, and then formation public information TPC command value, thereby obtain the TPC instruction accumulated value of public information at the cumulative process that user side is finished public information TPC command value, and upload this TPC instruction accumulated value to the base station in the predetermined interval phase.Because the user does not need to upload the TPC command value to the base station continuously, has reduced the load of up link like this; In addition, because data service is sudden, uploading TPC instruction accumulated value to the base station is the random fluctuation along with the burst frequency of customer-specific data information, and requires to guarantee to upload the bit value of TPC instruction.
Claims (7)
1, a kind of Poewr control method that is used for code division multiple address communication system is characterized in that this method may further comprise the steps:
(1) user judges whether the information frame that the base station sends carries customer-specific data information;
(2) if do not carry customer-specific data information, the user measures and preserves the public information signal to noise ratio that this information frame transmits, and enters step (4); Otherwise, enter step (3);
(3) user measures the signal to noise ratio of this customer-specific data information, compares with target signal to noise ratio, and to obtain transmission power control instruction be the TPC command value and be uploaded to the base station, and the user preserves this TPC command value, enters step (5);
(4) user judges further whether the last information frame of this information frame carries customer-specific data information, if last information frame carries and does not have customer-specific data information, user relatively this information frame transmits the signal to noise ratio of public information and the signal to noise ratio that last information frame transmits public information, obtain the TPC command value, upload the base station; Otherwise the user uploads the TPC command value of last information frame to the base station;
(5) after the base station receives the TPC command value that transmits on the user, determine whether this information frame carries customer-specific data information, if do not carry customer-specific data information, add up the TPC command value that receives and form TPC instruction accumulated value in the base station, when treating to carry subsequently the customer-specific data information frame and need transmit, adjust the base station with this TPC instruction accumulated value and transmit the transmitting power that this carries the customer-specific data information frame; Otherwise when treating that the base station determines that carrying the customer-specific data information frame subsequently need transmit, the base station is directly adjusted the base station with the TPC command value that receives and is transmitted the transmitting power that this carries the customer-specific data information frame.
2, Poewr control method as claimed in claim 1 is characterized in that, in the step (4) when last information frame does not carry customer-specific data information the formation of TPC command value may further comprise the steps:
(a) this information frame transmits the signal to noise ratio of the signal to noise ratio of public information greater than last information frame transmission public information, and the TPC command value of then uploading the base station in last information frame adds that a step-length obtains this information frame TPC command value;
(b) this information frame transmits the signal to noise ratio of the signal to noise ratio of public information less than last information frame transmission public information, and the TPC command value of then uploading the base station in last information frame deducts a step-length and obtains this information frame TPC command value;
(c) signal to noise ratio of this information frame transmission public information equals the signal to noise ratio that last information frame transmits public information, and then this information frame TPC command value is for to upload the TPC command value of base station at last information frame.
3, Poewr control method as claimed in claim 1 is characterized in that, each information frame that the base station sends the user to all carries public information.
4, a kind of Poewr control method that is used for code division multiple address communication system is characterized in that this method may further comprise the steps:
(1) system is provided with the user uploads the predetermined interval phase from public information TPC instruction accumulated value to the base station;
(2) user judges whether the information frame that receives carries customer-specific data information;
(3) if do not carry customer-specific data information, the user measures and preserves the public information signal to noise ratio that transmits by this information frame, enters step (5); Otherwise enter step (4)
(4) user measures the signal to noise ratio of this customer-specific data information, compares with target signal to noise ratio, obtains the TPC command value and is uploaded to the base station, and the user preserves this TPC command value, enters step (7);
(5) user judges further whether the last information frame of this information frame carries customer-specific data information, if last information frame carries customer-specific data information, and user's TPC command value of last information frame that adds up then; Otherwise user relatively this information frame transmits the signal to noise ratio of public information and the signal to noise ratio of last information frame transmission public information, obtains the TPC command value and adds up;
(6) user uploads TPC instruction accumulated value through the predetermined interval phase to the base station;
(7) after the base station receives and preserves the TPC command value or TPC instruction accumulated value that transmits on the user, to be determined when carrying the customer-specific data information frame subsequently and need transmit, adjust the base station with this TPC command value and send the transmitting power that this carries the customer-specific data information frame.
5, Poewr control method as claimed in claim 4 is characterized in that, in the step (5) when last information frame does not carry customer-specific data information the formation of TPC command value comprise step:
(a) this information frame transmits the signal to noise ratio of the signal to noise ratio of public information greater than last information frame transmission public information, and the TPC command value of then uploading the base station in last information frame adds that a step-length obtains this information frame TPC command value;
(b) this information frame transmits the signal to noise ratio of the signal to noise ratio of public information less than last information frame transmission public information, and the TPC command value of then uploading the base station in last information frame deducts a step-length and obtains this information frame TPC command value;
(c) signal to noise ratio of this information frame transmission public information equals the signal to noise ratio that last information frame transmits public information, and then this information frame TPC command value is for to upload the TPC command value of base station at last information frame.
6, Poewr control method as claimed in claim 4 is characterized in that, the predetermined interval phase described in the step (1) is less than two intervals that carry customer-specific data information frame.
7, Poewr control method as claimed in claim 4 is characterized in that, each information frame that the base station sends the user to all carries public information.
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| CNB021441774A CN100454799C (en) | 2002-10-16 | 2002-10-16 | A power control method for code division multiple access communication system |
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| CNB021441774A CN100454799C (en) | 2002-10-16 | 2002-10-16 | A power control method for code division multiple access communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100365950C (en) * | 2004-05-25 | 2008-01-30 | 华为技术有限公司 | A method for obtaining downlink transmission power of a base station system |
| US7590389B2 (en) * | 2005-02-14 | 2009-09-15 | Ipwireless, Inc. | Radio link quality determination in a wireless network |
| CN100373806C (en) * | 2005-11-02 | 2008-03-05 | 中兴通讯股份有限公司 | High-speed shared control channel and high-speed shared information channel power control implementation method |
| GB2447439B (en) * | 2007-02-02 | 2012-01-25 | Ubiquisys Ltd | Access point power control |
| CN101488786B (en) * | 2008-01-15 | 2013-02-27 | 中兴通讯股份有限公司 | A method for controlling uplink power in a time division synchronous code division multiple access system |
| CN102045824A (en) * | 2009-10-22 | 2011-05-04 | 中兴通讯股份有限公司 | Method for controlling power of downlink channel of trunking communication system, base station and mobile station |
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| WO1996002097A1 (en) * | 1994-07-11 | 1996-01-25 | Qualcomm Incorporated | Reverse link, closed loop power control in a code division multiple access system |
| CN1281323A (en) * | 1999-07-16 | 2001-01-24 | 深圳市华为技术有限公司 | Method and device for controlling transmitting power of base station in CDMA system |
| CN1440595A (en) * | 2000-06-30 | 2003-09-03 | 艾利森电话股份有限公司 | Communication method and its power control |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996002097A1 (en) * | 1994-07-11 | 1996-01-25 | Qualcomm Incorporated | Reverse link, closed loop power control in a code division multiple access system |
| CN1281323A (en) * | 1999-07-16 | 2001-01-24 | 深圳市华为技术有限公司 | Method and device for controlling transmitting power of base station in CDMA system |
| CN1440595A (en) * | 2000-06-30 | 2003-09-03 | 艾利森电话股份有限公司 | Communication method and its power control |
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