CN1232057C - Method based on packet exchange service for setting up downlink emitting power - Google Patents
Method based on packet exchange service for setting up downlink emitting power Download PDFInfo
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- CN1232057C CN1232057C CNB011133082A CN01113308A CN1232057C CN 1232057 C CN1232057 C CN 1232057C CN B011133082 A CNB011133082 A CN B011133082A CN 01113308 A CN01113308 A CN 01113308A CN 1232057 C CN1232057 C CN 1232057C
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Abstract
The present invention provides a method for setting initial transmitting power for a packet switching service with a high code rate in a low-starting and fast-raising mode with fixed step size in a broadband CDMA system, which accelerates the convergence rate of the initial power. Because the requirement for the power of the packet switching service is high, the low-starting and fast-raising method is adopted, which effectively avoids large interference brought by a high-starting and fast-lowering method; simultaneously, because the requirement for the time delay of the packet switching service is lower than that of a voice service, and an ARQ retransmission mechanism is provided, the communication quality within the setting time can not be influenced. The present invention is a comprehensive method which can be adjusted and changed according to different protocol requirements, communication quality, feedback indication and data rates.
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 broadband multiple access communication power.
Wideband Code Division Multiple Access (WCDMA) (WCDMA) is a 3-G (Generation Three mobile communication system) standardization body (3
RdGenerationPartnership Project (3GPP)) Radio Transmission Technology (RTT) scheme of Ti Chuing.Other multiple access technology is that people are known in this area as time division multiple access (TDMA) and frequency division multiple access (FDMA), 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.But be to use the business of these technology mainly to be confined to speech and low-rate data transmission, and 3-G (Generation Three mobile communication system) can provide and the similar multimedia service of fixed network in mobile communication, support global roaming and have the good service quality.
In Wideband Code Division Multiple Access (WCDMA) (WCDMA) 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.
In order to guarantee the communication quality of starting stage, the method for using always in the existing Narrowband CDMA (CDMA) that the initial downstream traffic channel emission power is set is based on high the rising of power of closed loop feedback and falls method soon.The feedback signal that Initial Trans is based on travelling carriage is adjusted in the base station, as power control command (TPC), 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, guarantee the launch mass of starting stage, entered 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.Narrowband CDMA (CDMA) has only provided based on business such as the Circuit-switched speeches of low code check, and Wideband Code Division Multiple Access (WCDMA) (WCDMA) system is except providing low code check circuit-switched service, packet switching service based on high code rate also is provided, because the transmit power needs of the packet switching service of high code rate is compared much bigger with low code check circuit-switched service, so on the method to set up of various different business initial downlink transmitting powers, if still use original high method of falling soon, then when high-speed data service inserts, the downlink gross power of system can increase a lot suddenly, thereby bring very big instantaneous interference power for other users, cause other user communication qualities declines (showing as Ec/No reduces a lot suddenly).
Purpose of the present invention is exactly at above-mentioned the deficiencies in the prior art, propose a kind of in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system mixed service, the method to set up of the Initial Trans of the packet switching service of high code rate.In Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, distinguish different types of business, select the method to set up of hang down the fast Initial Trans that rises of fixed step size for use at packet switching service, to reach the purpose of accelerating convergence rate and minimizing interference power.
The down initial transmitting power method to set up of the packet switching service that the present invention proposes 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 from the N+1 frame, and receive the emissive power control command (TPC) of N frame from travelling carriage;
3. judge whether emissive power control command (TPC) requires power to rise, if then order is carried out; If not then enter step 8;
4. increase transmitting power with step-length deltaP1, continue to receive emissive power control command (TPC);
5. judge whether emissive 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 4; If not, then return step 4, circulation is carried out;
7. reduce transmitting power with step-length deltaP2, enter step 11 then;
8. reduce transmitting power with step-length deltaP3, continue to receive emissive power control command (TPC);
9. judge whether emissive 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 common fast closed-loop power control.
Select the method to set up of having hanged down the fast Initial Trans that rises of fixed step size in Wideband Code Division Multiple Access (WCDMA) provided by the invention (WCDMA) system for use at high code check packet switching service, it has effectively utilized the fast characteristics of frequency that power control command, emissive power control command (TPC) feed back, and has accelerated the convergence rate of initial power; Because Packet Service power demand height, adopt and hanged down the fast method that rises, effectively avoided the high bigger interference that brings of falling method soon that rises, simultaneously because Packet Service is not so good as the voice service height to delay requirement, and automatic repeat requests ARQ retransmission mechanism is arranged, so that although power begins is lower, do not influence the communication quality in the adjustment time yet.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 drawings and Examples.
Fig. 1 is the enforcement block diagram that the present invention is applied to the control of WCDMA system forward power;
Fig. 2 is the flow chart that adopts Initial Trans method to set up of the present invention.
Fig. 3 adopts high rising to fall the OPNET simulation result figure that method is disturbed other users soon.
Fig. 4 adopts to have hanged down the OPNET simulation result figure that fast lifting method disturbs other users.
Fig. 1 is the enforcement block diagram that the present invention is applied to the control of WCDMA system forward power.Form by base station 100 and travelling carriage 110.
In this example, emissive power control command (TPC) order 101 is extracted by up channel 114 in base station 100, 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 the signal-to-interference ratio measurement 111 of Traffic Channel in the travelling carriage, measurement result and target signal interference ratio are relatively, cause emissive power control command (TPC) order to produce 112, the emissive 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 received emissive power control commands (TPC) order of extracting, and send the power setting order and adjust 104 power that form down channel 105 by transmitting power by common fast closed-loop power control 103.Initial Trans method to set up of the present invention residing position in implementing block diagram is that Initial Trans is provided with 102.
What Fig. 2 described is the flow chart that adopts Initial Trans method to set up of the present invention.
This logic flow starts from step 200, ends at step 216.
Step 200 is judged whether packet switching service of downlink business, and class of business is screened.
If not packet switching service then enters step 215 according to type of service, forward the common fast closed-loop power control of step 216 after the initial power method to set up of taking to be fit to.Step 215 has patent to be described in addition.
If packet switching service then enters step 201 with the transmitting power Pinit of smaller power setting from the 1st frame to the N frame.
Order enters step 202, starts timer T from the N+1 frame, and receives previous emissive power control command (TPC).
Order enters step 203, judges whether emissive power control command (TPC) requires power to rise.
If step 203 judged result, the initial value that configuration is described then enters step 204 less than the actual transmitting power of answering, and increases transmitting power with deltaP1.Step 205 continues to receive emissive power control command (TPC), step 206 judges whether emissive power control command (TPC) requires power to rise, if not then execution in step 209 changes the common fast closed-loop power control of step 216 over to then with deltaP2 minimizing transmitting power; If then order execution in step 207 increases transmitting power with deltaP1.Step 208 judges whether timer T is overtime, if then enter the common fast closed-loop power control of step 216; If not, then return step 205, 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, enter common fast closed-loop power control model.
If not step 203 judged result, the initial value that configuration is described greater than the actual transmitting power of answering, then enter step 210 and reduce transmitting power with deltaP3.Step 211 continues to receive emissive power control command (TPC).Step 212 judges whether emissive power control command (TPC) requires power to descend, if not, then enter the common fast closed-loop power control of step 216; If then order execution in step 213 reduces transmitting power with deltaP3; Step 214 judges whether timer T is overtime, if then enter the common fast closed-loop power control of step 216; If not, then return step 211, 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.
Adopt the fast lifting method that hanged down of fixed step size, because its down initial transmitting power is lower, even when having high-speed data service to insert, the downlink gross power of system does not have very big moment sudden change yet, can not cause bigger instantaneous interference to other users, thereby the height of having avoided fixed step size plays fast lifting method and disturbs big shortcoming, has improved the downlink communication quality of other users when high-speed data inserts.
According to the needs of each WCDMA system and concrete applied environment, can select flexibly the value of each parameter.
Fig. 3 adopts high rising to fall the OPNET simulation result that method is disturbed other users soon.Abscissa is represented simulation time among the figure, and ordinate is represented a user's downlink communication quality (signal interference ratio of down link).Along with the carrying out of simulation time, have high speed receipt user and add, being provided with of its down initial transmitting power adopts high rising to fall method soon.As can be seen from the figure, high speed receipt user's adding is disturbed very big to other users, causes that other user communication qualities descend.
Fig. 4 adopts to have hanged down the OPNET simulation result that fast lifting method disturbs other users.Abscissa is represented simulation time among the figure, and ordinate is represented a user's downlink communication quality (signal interference ratio of down link).Along with the carrying out of simulation time, have high speed receipt user and add, fast lifting method has been hanged down in the employing that is provided with of its down initial transmitting power.As can be seen from the figure, high speed receipt user's adding is disturbed less to other users, and is little to other user communication quality influences.
Claims (1)
1, a kind of method to set up of the down initial transmitting power based on packet switching service is characterized in that 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 from the N+1 frame, and receive the emissive power control command (TPC) of N frame from travelling carriage;
(3) judge whether emissive power control command (TPC) requires power to rise, if then order is carried out;
If not then enter step 8;
(4) increase transmitting power with step-length deltaP1, continue to receive emissive power control command (TPC);
(5) judge whether emissive 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 4; If not, then return step 4, circulation is carried out;
(7) reduce transmitting power with step-length deltaP2, enter step 11 then;
(8) reduce transmitting power with step-length deltaP3, continue to receive emissive power control command (TPC);
(9) judge whether emissive 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 common fast closed-loop power control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011133082A CN1232057C (en) | 2001-07-04 | 2001-07-04 | Method based on packet exchange service for setting up downlink emitting power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011133082A CN1232057C (en) | 2001-07-04 | 2001-07-04 | Method based on packet exchange service for setting up downlink emitting power |
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| Publication Number | Publication Date |
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| CN1394014A CN1394014A (en) | 2003-01-29 |
| CN1232057C true CN1232057C (en) | 2005-12-14 |
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| CNB011133082A Expired - Fee Related CN1232057C (en) | 2001-07-04 | 2001-07-04 | Method based on packet exchange service for setting up downlink emitting power |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2004217173B2 (en) * | 2003-03-05 | 2009-04-23 | Koninklijke Philips Electronics N.V. | Frame synchronization with acknowledgment timeout in wireless networks |
| CN100362764C (en) * | 2004-01-01 | 2008-01-16 | 华为技术有限公司 | Forward power control method for CDMA system |
| CN100382456C (en) * | 2004-12-03 | 2008-04-16 | 华为技术有限公司 | Down line power control method for radio communication system while initial establishing radio link |
| CN101459449A (en) * | 2007-12-14 | 2009-06-17 | 大唐移动通信设备有限公司 | Channel power control method and apparatus |
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