CN1398073A - Method for setting up initial down transmitting power according to circuit switch service - Google Patents
Method for setting up initial down transmitting power according to circuit switch service Download PDFInfo
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- CN1398073A CN1398073A CN 01126158 CN01126158A CN1398073A CN 1398073 A CN1398073 A CN 1398073A CN 01126158 CN01126158 CN 01126158 CN 01126158 A CN01126158 A CN 01126158A CN 1398073 A CN1398073 A CN 1398073A
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Abstract
This invention provides a set method of comprehensively using initial emitting power of high speed start, quick-fall and low speed start, quick-rise for the fixed step-length in CDMA system to judge and select one according to the downstream public pilot frequency power or signal-interference ration received by the base station from the mobile stations to effectively use the good quality of high speed start, quick fall or less interference of low speed start, quick rise methods, speeding up power convergence velocity. This comprehensive method may adjust and change according to different protocols, communication quality feed back indication and data speed.
Description
The present invention relates to communication system, be specifically related to the method to set up of the Initial Trans of base station down Traffic Channel in the control of CDMA communication power.
Time division multiple access (TDMA) and frequency division multiple access (FDMA) are that people are known at moving communicating field, the technology that communicates when being put to practical code division multiple access (CDMA) modulation technique and being to exist a large amount of system user.Capacity that it provides and band efficiency are than high many of all wanting of providing of time division multiple access (TDMA) and frequency division multiple access (FDMA).
In code division multiple access (CDMA) system, the transmitting power of downlink traffic channel need begin from default transmitting power through the quick power change procedure, converge on one within a certain period of time and can satisfy quality requirement substantially, and more stable Initial Trans enters fast closed-loop power control or slow power control then and waits other power control modes.
The service set that existing code division multiple access (CDMA) provides is in circuit-switched service, can not accurately predict under the situation of link load and descending interference, in order to guarantee the communication quality of starting stage, the most frequently used method that the initial downstream traffic channel emission power is set is based on the high method of falling soon that rises of power of closed loop feedback.The feedback signal that Initial Trans is based on travelling carriage is adjusted in the base station, as power control TPC order, the indication of mistake frame etc., adjusting range according to fixed step size or variable step, adjust power fast downwards since a higher default power, and converge on a comparatively stable Initial Trans, enter fast closed-loop power control or other control modes then.The adjusting range of the power convergence process in this stage and convergence rate all are far longer than fast closed-loop power control, for follow-up accurate fast closed-loop power control provide one rough, reach the Initial Trans of quality requirement substantially.High method of falling soon can guarantee the communication quality of this link in initial power is provided with the phase, but for nearer from the base station or receive the user that interference power is less, the high down initial transmitting power that falls the method setting soon that rises may be far longer than its actual power demand, make the fast power change procedure of beginning prolong, and therefore other users are formed bigger interference, cause other users' downlink communication quality to descend.Purpose of the present invention is exactly at above-mentioned the deficiencies in the prior art, propose a kind of in code division multiple access (CDMA) system, the method to set up of the Initial Trans of circuit-switched service.Utilize existing measuring technique, take all factors into consideration and use the height of fixed step size to play the integrated approach that falls soon, reach the purpose that under the situation that guarantees the quality of reception, reduces interference power.
The down initial transmitting power method to set up of the circuit-switched service that the present invention proposes may further comprise the steps:
Step 1: the received power or the signal interference ratio that receive the public guide frequency of up channel report;
Step 2: judge whether the power or the signal interference ratio that receive are less than or equal to power or signal interference ratio threshold value, if then order is carried out, if not then enter step 4;
Step 3: the height of use fixed step size plays the method for falling soon Initial Trans is set;
Step 4: use the fast method that rises of having hanged down of fixed step size that Initial Trans is set.
Threshold value in the described step 2 is relevant with the sub-district, the pilot transmit power difference of different districts, and this threshold value is also inequality; Threshold value is big more, adopt the possibility of having hanged down fast lifting method just big more when the user inserts, and threshold value is more little, adopts the possibility of having hanged down fast lifting method just more little when the user inserts.
The height of the fixed step size that adopts in the described step 3 rises and falls flow process soon and may further comprise the steps:
1. with the transmitting power Pinit of higher-wattage setting from the 1st frame to the N frame;
2. start timer T from the N+1 frame, and receive previous power control command (TPC);
3. judge whether power control command (TPC) requires power to descend, if then order is carried out; If not then enter step 8;
4. reduce transmitting power with step-length deltaP1, continue received power control command (TPC);
5. judge whether power control command (TPC) requires power to descend, if then order is carried out; If not then enter step 7;
6. judge whether timer T is overtime, if then enter step 11; If not, then return step 4, circulation is carried out;
7. increase transmitting power with step-length deltaP2, enter step 5 then;
8. increase transmitting power with step-length deltaP3, continue received power control command (TPC);
9. judge whether power control command (TPC) requires power to rise, if then order is carried out; If not, then enter step 11;
10. judge whether timer T is overtime, if then enter step 11; If not, then return step 8, circulation is carried out;
11. carry out common fast closed-loop power control.
The fast up-flow journey of having hanged down of the fixed step size that step 4 adopts may further comprise the steps:
1.) with the transmitting power Pinit of smaller power setting from the 1st frame to the N frame;
2.) start timer T, and receive previous power control command (TPC) from the N+1 frame;
3.) judge whether power control command (TPC) requires power to rise, if then order is carried out; If not then enter step 8)
4.) increase transmitting power, continue received power control command (TPC) with step-length deltaP1;
5.) judge whether power control command (TPC) requires power to rise, if then order is carried out; If not then enter step 7);
6.) judge whether timer T is overtime, if then enter step 11); If not, then return step 4), circulation is carried out;
7.) reduce transmitting power, enter step 11) then with step-length deltaP2;
8.) reduce transmitting power, continue received power control command (TPC) with step-length deltaP3;
9.) judge whether power control command (TPC) requires power to descend, if then order is carried out; If not, then enter step 11);
10.) judge whether timer T is overtime, if then enter step 11); If not, then return step 8), circulation is carried out;
11.) carry out the control of common fast closed-loop power.
Play the method to set up of having hanged down the fast Initial Trans that rises of falling soon at the comprehensive height of fixed step size that uses in the circuit-switched service in code division multiple access provided by the invention (CDMA) system with fixed step size, it reports the base station according to travelling carriage, and it receives down public guide frequency power or signal-to-interference ratio measurement value and judges and select the wherein a kind of of two kinds of methods for use, effectively utilized and high played that to fall the method quality soon good, hang down fast lifting method and disturbed little advantage, avoided high rising to fall the method interference soon greatly, hang down the ropy shortcoming of fast lifting method, and accelerated power convergence speed.The present invention is comprehensive means, can adjust and changes at different protocol requirements, communication quality, feedback indication and data rate.
Further specify the present invention below in conjunction with accompanying drawing and enforcement.
Fig. 1 is the enforcement block diagram that the present invention is applied to the control of cdma system forward power;
Fig. 2 is the flow chart that adopts Initial Trans method to set up of the present invention;
Fig. 3 is that the height that is applied to fixed step size of the present invention plays the flow chart that falls step soon;
Fig. 4 is the flow chart that rises step soon that hanged down that is applied to fixed step size of the present invention.
Fig. 1 is the enforcement block diagram that the present invention is applied to the control of cdma system forward power.Form by base station 100 and travelling carriage 110.
In this example, power control command (TPC) order is extracted by up channel 115 in base station 100, obtain the down public guide frequency received power or receive signal interference ratio 101, enter Initial Trans then and be provided with 102, the power setting order is formed the power of down channel 105 by transmitting power adjustment 104, radiofrequency signal is propagated at down channel 105, receive via travelling carriage 110, carry out down public guide frequency received power or signal-to-interference ratio measurement 111 and Traffic Channel signal-to-interference ratio measurement 112 in the travelling carriage, down public guide frequency received power or signal-to-interference ratio measurement result serve capable channel 115 and are received by base station 100, Traffic Channel signal-to-interference ratio measurement result and target signal interference ratio are relatively, cause power control command (TPC) order to produce 113, the power control command of generation (TPC) order is inserted up channel 114 and is received by base station 100.Started originally and penetrated after power setting 102 finishes, then order, and send the power setting order is formed down channel 105 by transmitting power adjustment 104 power by the power control command (TPC) that common fast closed-loop power is controlled or other control modes 103 receive extraction.Initial Trans method to set up of the present invention residing position in implementing block diagram is that Initial Trans is provided with 102.The down public guide frequency channel is not stopped paying out and is penetrated, and each sub-district all has a unique pilot signal to be distinguished, and the travelling carriage that it is used for all are worked at base station overlay area carries out synchronously and switches.
What Fig. 2 described is to adopt Initial Trans of the present invention that the flow chart of step is set.
Threshold value in the step is relevant with the sub-district, the pilot transmit power difference of different districts, and this threshold value is also inequality.Threshold value is big more, adopt the possibility of having hanged down fast lifting method just big more when the user inserts, and threshold value is more little, adopts the possibility of having hanged down fast lifting method just more little when the user inserts.When concrete the application, can determine a more reasonably value according to link budget or actual measurement.
This logic flow starts from step 200, ends at step 204.Step 200 receives the received power or the signal interference ratio of the public guide frequency of up channel report;
Step 201 judges whether the power or the signal interference ratio that receive are less than or equal to power or signal interference ratio threshold value, if not then forward step 203 to; If then the order execution in step 202;
Step 202 is used the height of fixed step size to play the method for falling soon Initial Trans is set, and forwards step 204 to after withdrawing from;
Step 203 uses the fast method that rises of having hanged down of fixed step size that Initial Trans is set;
The common fast closed-loop power control of step 204 or other control modes.
Power threshold is between maximal received power and minimum received power, and general maximal received power obtains via the network link budget greater than more than the minimum received power 10dB, and the power threshold optimum value is the intermediate value of maximal received power and minimum received power.(received power unit watt)
The signal interference ratio thresholding receives signal interference ratio and minimum the reception between the signal interference ratio between maximum, and maximum reception signal interference ratio and the minimum signal interference ratio that receives obtain via the network link budget, and the power threshold optimum value is that maximum receives signal interference ratio and the minimum intermediate value that receives signal interference ratio.(receive signal interference ratio and do not have unit).
According to the needs of each cdma system and concrete applied environment, can select flexibly the value of each parameter.
By judging the received power or the signal interference ratio of down public guide frequency channel, can know the distance of travelling carriage and base station qualitatively, path loss and Communication Jamming situation, thus adopt different power setting methods respectively.If the power or the signal interference ratio that receive are less than or equal to power or signal interference ratio threshold value, illustrate that then travelling carriage is far away from the base station, path loss big or communication environment is poor, it is big to need high transmit power could satisfy the possibility of communication quality, so be fit to select for use the height of fixed step size to play the method for falling soon; Otherwise, illustrating that then travelling carriage is near from the base station, path loss is little or communication environment good, the possibility that only needs low transmitting power can satisfy communication quality is big, so be fit to select for use the fast method that rises of having hanged down of fixed step size.
What Fig. 3 described is that the height that is applied to fixed step size of the present invention plays the flow chart that falls step soon.
This logic flow starts from step 300, ends at step 314.
Step 300 is with the transmitting power Pmax of more high-power setting from the 1st frame to the N frame.
Step 301 starts timer T from the N+1 frame, and receives previous power control command (TPC).
Step 302 judges whether power control command (TPC) requires power to descend.
If step 302 judged result, the initial value that configuration is described then enters step 303 greater than the actual transmitting power of answering, and reduces transmitting power with step-length deltaP1.Step 304 continues received power control command (TPC), step 305 judges whether power control command (TPC) requires power to descend, if not then execution in step 308 increases transmitting power with step-length deltaP2 and changes step 314 then over to and withdraw from high rising and fall method soon the Initial Trans flow process is set; If then order execution in step 306 reduces transmitting power with step-length deltaP1.Step 307 judges whether timer T is overtime, if then enter step 314 and withdraw from; If not, then return step 304, circulation is carried out.If require to reduce transmitting power and regularly not overtime in the cyclic process always, the transmitting power of down channel will reduce fast so, unless timer expiry or the order that has requirement power to rise arrive, just end setting up procedure, withdraws from.
If not step 302 judged result, the initial value that configuration is described are less than the actual transmitting power of answering, then entering step 309 increases transmitting power with step-length deltaP3.Step 310 continues received power control command (TPC).Step 311 judges whether power control command (TPC) requires power to rise, if not, then enter step 314; If then order execution in step 312 increases transmitting power with step-length deltaP3; Step 313 judges whether timer T is overtime, if then enter step 314 and withdraw from; If not, then return step 310, circulation is carried out.Unless the condition that the order that timer expiry is satisfied in circulation or have requirement power to descend arrives is just end.
If pilot power or signal interference ratio that the user receives are less than or equal to power or signal interference ratio threshold value, illustrate that then this user is far away from the base station, path loss big or communication environment is poor, need high transmit power could satisfy communication quality, select for use this moment the height of fixed step size to rise and fall method soon, the higher down initial transmitting power and the actual needs power ratio of its setting are more approaching, thereby guaranteed the speech quality of starting stage, and accelerated the initial power convergence rate.
What Fig. 4 described is to be applied to the fast flow chart of steps that rises of having hanged down of fixed step size of the present invention.Step is to adjust upward power according to fixed step size fast since a lower default power, and converges on a comparatively stable Initial Trans, enters fast closed-loop power control or other control modes then.This method can reduce the interference to other communication links, but because the transmitting power of starting stage is low, for the delay requirement height, and the circuit-switched service that does not have ARQ, the relatively poor quality in this stage may not tolerate that this logic flow starts from step 400, ends at step 414.
Step 400 is with the transmitting power Pmin of smaller power setting from the 1st frame to the N frame.
Step 401 starts timer T from the N+1 frame, and receives previous power control command (TPC).
Step 402 judges whether power control command (TPC) requires power to rise.
If step 402 judged result, the initial value that configuration is described then enters step 403 less than the actual transmitting power of answering, and increases transmitting power with step-length deltaP1.Step 404 continues received power control command (TPC), step 405 judges whether power control command (TPC) requires power to rise, if not then execution in step 408 reduces transmitting power with step-length deltaP2 and changes step 414 then over to and withdraw from and hanged down fast lifting method the Initial Trans flow process is set; If then order execution in step 406 increases transmitting power with step-length deltaP1.Step 407 judges whether timer T is overtime, if then enter step 414 and withdraw from and hanged down fast lifting method the Initial Trans flow process is set; If not, then return step 404, circulation is carried out.If require to increase transmitting power and regularly not overtime in the cyclic process always, the transmitting power of down channel will increase fast so, unless timer expiry or the order that has requirement power to descend arrive, just end setting up procedure, withdraws from.
If not step 402 judged result, the initial value that configuration is described greater than the actual transmitting power of answering, then enter step 409 and reduce transmitting power with step-length deltaP3.Step 410 continues received power control command (TPC).Step 411 judges whether power control command (TPC) requires power to descend, if not, then enter step 414; If then order execution in step 412 reduces transmitting power with step-length deltaP3; Step 413 judges whether timer T is overtime, if then enter step 414 and withdraw from; If not, then return step 410, circulation is carried out.Unless the condition that the order that timer expiry is satisfied in circulation or have requirement power to rise arrives is just end.
If pilot power that the user receives or signal interference ratio are greater than power or signal interference ratio threshold value, illustrate that then this user is nearer or communication environment is better from the base station, lower transmitting power just can satisfy communication quality, select the fast lifting method of having hanged down of fixed step size this moment for use, the low descending Initial Trans and the actual needs power ratio of its setting are more approaching, thereby in the speech quality that guarantees the starting stage, reduced interference, and accelerated the initial power convergence rate other users.
Claims (3)
1, a kind of method to set up of the down initial transmitting power based on circuit-switched service is characterized in that may further comprise the steps:
Step 1: the received power or the signal interference ratio that receive the public guide frequency of up channel report;
Step 2: judge whether the power or the signal interference ratio that receive are less than or equal to power or signal interference ratio threshold value, if then order is carried out, if not then enter step 4;
Step 3: the height of use fixed step size plays the method for falling soon Initial Trans is set;
Step 4: with the transmitting power Pinit of smaller power setting from the 1st frame to the N frame;
Step 5: start timer T from the N+1 frame, and receive previous power control command (TPC);
Step 6: judge whether power control command (TPC) requires power to rise, if then order is carried out; If not then enter step 11;
Step 7: increase transmitting power with step-length deltaP1, continue received power control command (TPC);
Step 8: judge whether power control command (TPC) requires power to rise, if then order is carried out; If not then enter step 10;
Step 9: judge whether timer T is overtime, if then enter step 14; If not, then return step 7, circulation is carried out;
Step 10: reduce transmitting power with step-length deltaP2, enter step 14 then;
Step 11: reduce transmitting power with step-length deltaP3, continue received power control command (TPC);
Step 12: judge whether power control command (TPC) requires power to descend, if then order is carried out; If not, then enter step 14;
Step 13: judge whether timer T is overtime, if then enter step 14; If not, then return step 11, circulation is carried out;
Step 14: carry out common fast closed-loop power control.
2, the method to set up of the down initial transmitting power based on circuit-switched service according to claim 1, it is characterized in that: the power threshold in the described step 2 is between maximal received power and minimum received power, general maximal received power is greater than more than the minimum received power 10dB, obtain via the network link budget, the power threshold optimum value is the intermediate value of maximal received power and minimum received power;
The signal interference ratio thresholding receives signal interference ratio and minimum the reception between the signal interference ratio between maximum, and maximum reception signal interference ratio and the minimum signal interference ratio that receives obtain via the network link budget, and the power threshold optimum value is that maximum receives signal interference ratio and the minimum intermediate value that receives signal interference ratio.
3, the method to set up of the down initial transmitting power based on circuit-switched service according to claim 1 is characterized in that: the height of the fixed step size that adopts in the described step 3 rises and falls method soon and may further comprise the steps:
(1) with the transmitting power Pinit of higher-wattage setting from the 1st frame to the N frame;
(2) start timer T from the N+1 frame, and receive previous power control command (TPC);
(3) judge whether power control command (TPC) requires power to descend, if then order is carried out; If not then enter step 8;
(4) step-length deltaP1 reduces transmitting power, continues received power control command (TPC);
(5) whether disconnected power control command (TPC) requires power to descend, if then order is carried out; If not then enter step 7;
(6) judge whether timer T is overtime, if then enter step 11; If not, then return step 4, circulation is carried out;
(7) increase transmitting power with step-length deltaP2, enter step 5 then;
(8) increase transmitting power with step-length deltaP3, continue received power control command (TPC);
(9) judge whether power control command (TPC) requires power to rise, if then order is carried out; If not, then enter step 11;
(10) judge whether timer T is overtime, if then enter step 11; If not, then return step 8, circulation is carried out;
(11) carry out common fast closed-loop power control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01126158 CN1275404C (en) | 2001-07-12 | 2001-07-12 | Method for setting up initial down transmitting power according to circuit switch service |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01126158 CN1275404C (en) | 2001-07-12 | 2001-07-12 | Method for setting up initial down transmitting power according to circuit switch service |
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| Publication Number | Publication Date |
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| CN1398073A true CN1398073A (en) | 2003-02-19 |
| CN1275404C CN1275404C (en) | 2006-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 01126158 Expired - Fee Related CN1275404C (en) | 2001-07-12 | 2001-07-12 | Method for setting up initial down transmitting power according to circuit switch service |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370708C (en) * | 2004-11-26 | 2008-02-20 | 华为技术有限公司 | Method for controlling public channel transmissive power in base station |
| CN100372405C (en) * | 2003-04-29 | 2008-02-27 | 华为技术有限公司 | Power equalization implementing method for dedicated down channel and reference power calculating circuit |
| WO2010078790A1 (en) * | 2008-12-29 | 2010-07-15 | 华为技术有限公司 | Transmission power adjusting method, apparatus and system |
| CN1983848B (en) * | 2006-04-14 | 2010-07-21 | 华为技术有限公司 | Method for controlling down-link transmitting power |
| CN101252379B (en) * | 2008-04-16 | 2011-07-20 | 中国科学院计算技术研究所 | Wireless network medium access control system and channel parameter regulation method |
-
2001
- 2001-07-12 CN CN 01126158 patent/CN1275404C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100372405C (en) * | 2003-04-29 | 2008-02-27 | 华为技术有限公司 | Power equalization implementing method for dedicated down channel and reference power calculating circuit |
| CN100370708C (en) * | 2004-11-26 | 2008-02-20 | 华为技术有限公司 | Method for controlling public channel transmissive power in base station |
| CN1983848B (en) * | 2006-04-14 | 2010-07-21 | 华为技术有限公司 | Method for controlling down-link transmitting power |
| CN101252379B (en) * | 2008-04-16 | 2011-07-20 | 中国科学院计算技术研究所 | Wireless network medium access control system and channel parameter regulation method |
| WO2010078790A1 (en) * | 2008-12-29 | 2010-07-15 | 华为技术有限公司 | Transmission power adjusting method, apparatus and system |
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| Publication number | Publication date |
|---|---|
| CN1275404C (en) | 2006-09-13 |
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