CN1878019A - Reverse outer-loop power control method and system - Google Patents
Reverse outer-loop power control method and system Download PDFInfo
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- CN1878019A CN1878019A CN 200610099313 CN200610099313A CN1878019A CN 1878019 A CN1878019 A CN 1878019A CN 200610099313 CN200610099313 CN 200610099313 CN 200610099313 A CN200610099313 A CN 200610099313A CN 1878019 A CN1878019 A CN 1878019A
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Abstract
The invention discloses an inversed out-race power control method and system in the communication technological domain, which comprises the following steps: the system selects needed power control step length in the corresponding relationship of preset subpack number and ending goal with specific adjusting step length according to the corrected demodulated subpack number and ending goal of received data pack; adjusting power control threshold value dynamically. The invention realizes real-time dynamic step length control in the changing condition of wireless environment, which makes PCT value converge the fitful value rapidly and precisely.
Description
Technical field
The present invention relates to communication technique field, relate in particular to a kind of reverse outer-loop power control method and system.
Background technology
Reverse power control is AN (access network) controls the AT transmitting power according to the reverse PER (Packet Error Ratio) of AT (accessing terminal) a kind of method.In CDMA (code division multiple access) system, for fear of the interference of oppositely going up between a plurality of AT, need carry out reverse power control at each AT, make and satisfying under the situation of reverse PER that the transmitting power of AT is low as far as possible.Reverse power control is divided into reverse inner loop power control and the control of backward external ring power again, as shown in Figure 1.
Oppositely the inner loop power control procedure is: BTS (base station) receives that by demodulation AT sends the PCT (power control thresholding) of reserved packet, compare with predefined PCT, if actual PCT greater than the PCT that sets, then sends power control bit notice AT by forward direction RPC (oppositely power control channel) channel and reduces power.Otherwise send power control bit notice AT bring to power.AT is by the power control bit of the described forward direction RPC of demodulation channel, promotes or reduces transmitting power.
The backward external ring power control process is: the PER of external circule power control module statistics reserved packet, compare with the target P ER that sets, and regulate the PCT value of setting in the inner loop power control.
Increased reverse HARQ (mix automatically retransmit) function in present CDMA EVDO Rev A (the data service optimisation technique of the A version code division multiple access evolution) system, can realize the normal demodulation of a son bag after, whole bag is normally demodulation just.Therefore, just can premature termination after the normal demodulation of son bag, and do not need 4 sons to wrap all normally demodulation behind the end of transmission.
In addition, CDMA EVDO Rev A supports low time delay and two kinds of transmission modes of high power capacity on reverse link.In its backward external ring power control algorithm, for the good judgment principle that wraps and wrap by mistake be: CRC (CRC) verification is passed through, and the demodulation time has been bag smaller or equal to the bag that stops target; CRC check is not passed through, and perhaps the demodulation time is the mistake bag greater than the bag that stops target.Good bag and the mistake bag of judging by this principle is called " the good bag of power control and mistake bag ", and its corresponding PER is called " power control PER ".For example: one stops the bag that target is 2 son bags, just correct demodulation after sending 4 son bags, though CRC check is passed through, the demodulation time has surpassed the termination target, so say on the power control meaning, determines that this bag is the mistake bag.
At present in CDMA EVDO Rev A system power control procedure, generally external circule power control is divided into three kinds of states: Idle state, free of data attitude, normal state, back closed loop power state of a control is moved situation as shown in Figure 2 under three states, and its power control operation is as described below:
Idle state: when AT is in Idle state, do not need to carry out the power control of backward external ring.
Normal state: when AT is in normal state, wrap judgment principle, judge the good bag/mistake bag situation of power control according to above-mentioned good bag and mistake, according to the value that the good bag/mistake bag situation and the transmission mode of described power control are upgraded PCT, the feasible PER that reaches target.Described renewal operation comprises: receiving when wrapping, making the PCT of the AT fixing less step-length that descends; Receive when mistake is wrapped, make fixing big step-length of PCT rising of AT.The ratio of rising and decline step-length is decided by PER, to guarantee the PER convergence.
Free of data attitude: AN receives empty bag continuously in a period of time (being generally less than the dormant state timer duration) after, the control of backward external ring power will enter " free of data attitude ".Under this state, owing to oppositely do not have transfer of data, do not constitute closed loop, the backward external ring power control operation PCT that will slowly raise.If received packet in " free of data attitude ", state can become " normal state "; If under " free of data attitude ", the dormant state timer expiry, state can become " Idle state ".
In the above-mentioned backward external ring power control process, under normal condition, do not segment for good the bag with the mistake bag, the fixed value that rise, the employing of decline step-length is single, in some occasion, this way of not carrying out careful differentiation seems that some is not too reasonable.Specific as follows described:
As Fig. 3, suppose that reverse termination target all is 1 son bag, considers following two kinds of situations respectively:
1) oppositely very poor, 4 son bags have all transmitted still normally demodulation.There is certain delay in the operation that backward external ring power control this moment promotes the PCT value;
2) oppositely better, demodulation success in second son bag, backward external ring power control this moment module in time promotes the PCT value.
Under above-mentioned two kinds of situations, the latter's channel circumstance is better than the former, and adjusting time with respect to the former its step-length can be later, step sizes can be less.But existing operation is not distinguished, and all the same to the adjustment step sizes of PCT, it is instead later that the former step-length is adjusted the time, so the speed convergence of power control is slower.
Another kind of situation such as Fig. 4, suppose that reverse termination target all is 4 son bags, considers following two kinds of situations respectively:
1) oppositely general, 4 son bags all pass when being over, just correct demodulation.Power control this moment is fallen the operation of value of PCT than later, has a fixed response time;
2) oppositely fine, first just correct demodulation of son bag, the power control module in time reduces the PCT value.
Under above-mentioned two kinds of situations, the latter's channel circumstance is better than the former, but it is all the same to adjust step-length.Therefore there is the slower shortcoming of power control speed convergence.
Summary of the invention
The object of the present invention is to provide a kind of reverse outer-loop power control method and system.
The objective of the invention is to be achieved through the following technical solutions:
A kind of reverse outer-loop power control method, system is according to the sub-Bale No. and the termination target of the correct demodulation of packet quilt that receives, at predefined sub-Bale No. and stop target and select the power control step-length that needs in the step-length corresponding relation, dynamically adjust power control gate limit value with concrete the adjustment.
The sub-Bale No. of described correct demodulation be meant correct demodulating data bag the child bag number of process.
The acquisition methods of the termination target of the described data that receive is:
From the reverse data bag that receives, obtain transmission mode, from the access network side, obtain QoS of customer requirement information, determine to stop target according to described transmission mode information and QoS of customer requirement information.
Described transmission mode and QoS of customer require information and the corresponding relation that stops target by user signing contract information and properties of flow decision, bring the Access Network side when the call setup by core-network side.
Before determining to adjust step-length, described method further comprises:
The data that receive are carried out CRC.
When check errors, described method further comprises:
Adjust power control gate limit value according to the adjustment step value of predefined check errors correspondence.
When setting in advance sub-Bale No. and stopping target and specifically adjust the step-length corresponding relation, satisfy:
Under static environment, satisfy when necessarily oppositely PER requires, from the process of whole power control, total step-length that total step-length that power control gate limit value raises equals to reduce.
Described system is that CDMA EVDO Rev A system is optimized in the data service of A version code division multiple access evolution.
Described system is for supporting the system of reserved packet premature termination.
A kind of backward external ring power control system comprises the backward external ring power control module, and described backward external ring power control module comprises:
Power control step-length information stores submodule is used to store packet by the sub-Bale No. of correct demodulation and termination target and the concrete correspondence relationship information of adjusting step-length;
Step-length is adjusted submodule, be used for being searched corresponding power control step-length by the sub-Bale No. of correct demodulation and termination target in described power control step-length information stores submodule stored relation, and send corresponding step-length adjustment information to corresponding entity according to received data packet.
Described backward external ring power control module also comprises:
The user profile sub module stored is used to preserve the quality of service information that the user contracts;
Packet information is obtained submodule, be used for the packet that receiving end/sending end sends, from described packet, obtain user's transmission mode, sub-Bale No. information, and obtain QoS of customer information from the user profile sub module stored, and, send step-length to and adjust submodule according to described transmission mode, the definite target that stops of QoS of customer information.
Described system also comprises:
The CRC module is used for the data that receive are carried out CRC, and sends check results to the backward external ring power control module, as the foundation of backward external ring power control.
As seen from the above technical solution provided by the invention, the present invention has realized the situation of change according to wireless environment, and real-time and dynamic changes backward external ring power control step-length, can be so that the value of PCT can rapid and precisely converge to suitable value.
Description of drawings
Fig. 1 is a prior art reverse power control schematic diagram;
Fig. 2 is a prior art back closed loop power state of a control transition graph;
Fig. 3 adjusts schematic diagram one for the power that prior art is not distinguished different mistake bags;
Fig. 4 adjusts schematic diagram two for the power that prior art is not distinguished different mistake bags;
Fig. 5 is a kind of embodiment module diagram of system of the present invention;
Fig. 6 is a kind of embodiment operational flowchart of the method for the invention.
Embodiment
Core concept of the present invention provides a kind of reverse outer-loop power control method and system, sub-Bale No. according to correct demodulation is selected different power control step-lengths with the termination target, realized situation of change according to wireless environment, real-time and dynamic changes backward external ring power control step-length, makes PCT can rapid and precisely converge to suitable value.
Sub-Bale No. of the present invention, expression have passed through the just correct demodulating data bag of how many son bags, and for example, sub-Bale No. is 0, then represent first just correct demodulation of son bag, and sub-Bale No. is the just correct demodulation of the 4th son bag of 3 expressions, have promptly passed through 3 just correct demodulation of son bag.
The invention provides a kind of backward external ring power control system, the module diagram that described system comprises as shown in Figure 5, described system comprises access terminal AT and base station system end.Comprise the packet transmitting element at the AT end, be used for sending packet to the base station according to user's needs.Be provided with the CRC check module at the base station system end, be used for the packet of receiving from the AT termination is carried out CRC check.Also be provided with the backward external ring power control module at the base station system end, be used for according to correctly the sub-Bale No. and the termination target of the reserved packet of demodulation are regulated the PCT value that inner loop power control is set.
Be provided with in the described backward external ring power control module:
Power control step-length information stores submodule is used to store power control step-length information, specifically comprises: the sub-Bale No. of each correct demodulation and termination target and the concrete correspondence relationship information of adjusting step-length; Can adopt form storage shown in following table one:
| Sub-Bale No. | Son bag 0 | Son bag 1 | Son bag 2 | Son bag 3 | CRC error |
| Stop target | |||||
| 0 | a | +1/8*b | +1/4*b | +1/2*b | b |
| 1 | -2a | a | +1/4*b | +1/2*b | b |
| 2 | -4a | -2a | a | +1/2*b | b |
| 3 | -8a | -4a | -2a | a | b |
Described a represents that the sub-Bale No. of receiving equals to stop target, and CRC check is when correct, the step-length of power control PCT downward modulation; During child bag CRC check mistake that b represents to receive, the step-length that power control PCT raises.+ expression PCT raises ,-expression PCT downward modulation.Be a=DELTA_Down_Normal_Goodframe, b=DELTA_Up_Normal_Badframe.
The user profile sub module stored is used to preserve quality of service information that the user contracts etc.
Packet information is obtained submodule, be used to receive the packet that the AT end sends, from described packet, obtain user's transmission mode, sub-Bale No., and from the user profile sub module stored, obtain user QoS information, and determine to stop target according to described transmission mode, user QoS information;
Step-length is adjusted submodule, be used to receive packet information and obtain the relevant information that submodule obtains, and in power control step-length information stores submodule, search corresponding adjustment step-length, and send step-length and adjust message to the inner loop power control module according to described termination target and sub-Bale No..
The invention provides a kind of reverse outer-loop power control method, a kind of embodiment operating process comprises the steps: as shown in Figure 6
Step 1: the backward external ring power control module is provided with power control step-length information, is stored in the power control step-length information stores submodule;
This power control step-length information comprises: the correspondence relationship information of sub-Bale No. and termination target and concrete step-length.As above shown in the table one.In definite described correspondence relationship information is to make PCT be stabilized near the small vibration suitable value, to reach final balance, need make a, b value in the table one equation one below satisfying:
(1-PER)*a＝PER*b
Under static environment, from the process of whole power control, total step-length that total step-length that PCT raises equals to reduce.For example, when PER=1%, then 99% to wrap on the power control meaning be bag, PCT reduces a, 1% wrap on the power control meaning is the mistake bag, PCT raises b.In order to guarantee the convergence of PER, being provided with of a and b must be satisfied equation one.
By equation one as can be known, therefore total step-length that total step-length that PCT raises equals to reduce can obtain, and is result in 3 o'clock the equation two stopping target:
P
subpacket0*(8a)+P
subpacket1*(4a)+P
subpacket2*(2a)+P
subpacket3*(a)＝P
CRCerror*(b)
P wherein
Subpacket0, P
Subpacket1, P
Subpacket2, P
Subpacket3Be illustrated respectively in all power controls and wrap neutron packet 0, son bag 1, son bag 2, the correct probability of son bag 3CRC verification, P well
CRCerrorThe probability of the child bag CRC check mistake that expression is received.
Equally, be 1 o'clock stopping target, the equation three below needing to satisfy:
P
subpacket0*(2a)+P
subpacket1*(a)＝P
subpacket2*(1/4b)+P
subpacket3*(1/2b)+P
CRCerror*(b)
Be 0 for stopping target, to stop target be that other situations such as 2 can obtain according to step-length adjusted value and the equation one determined in the table one equally.
Described a, b value can be determined according to the system emulation test.In the time of at first can drawing different termination targets by system emulation, the probability of each height bag premature termination under various channel model conditions.By system emulation, adjust the value of a, b then, the stability and the speed of observing system convergence.At last according to simulation result, select suitable a, the b value of a combination, can so that system quick and stable converge to set point.
The packet transmitting element of step 2:AT end sends packet to the base station, by the CRC check module described data is carried out CRC check, and sends check results to the backward external ring power control module;
Described CRC check process is a prior art, and the present invention does not do detailed description;
Step 3: if the CRC check mistake, packet information in the backward external ring power control module is obtained submodule and is sent described check errors information to step-length adjustment submodule, adjust submodule according to the step-length information of storing in the described information searching power control step-length information stores submodule by step-length, determine to adjust step-length, and the adjustment of transmission step-length is ordered to corresponding inner loop power control module, with reference to table one, making PCT raise step-length is b;
Step 4: if CRC check is passed through, then the packet information in the backward external ring power control module is obtained submodule and obtain user's transmission mode, sub-Bale No. from described packet, obtain user Qos information from the user profile sub module stored, and determine to stop target according to user's transmission mode, user QoS information.Described corresponding relation is by the decision of user signing contract information and properties of flow, brings the Access Network side when the call setup by core-network side;
Step 5: the packet information acquisition module sends described information to step-length and adjusts submodule, step-length is adjusted submodule and is searched the step-length information of storing in the power control step-length information stores submodule according to described termination target and sub-Bale No., determines to adjust step-length and send the step-length adjustment to order to corresponding inner loop power control module;
For example, the table of comparisons one, stopping target is 1, receives son bag 2, when CRC check was correct, then the step-length of PCT rise was 1/4*b.Suppose that stopping target is 3, receive son bag 2, CRC check is correct, and then the step-length of PCT downward modulation is 2a.
Step 6: the inner loop power control module is adjusted size according to the step-length of described indication and is adjusted the PCT value after receiving described step-length adjustment indication.
System and method of the present invention is applicable to the system of CDMA EVDO Rev A system and other support reserved packet premature terminations.
In sum, the present invention has realized the situation of change according to wireless environment, and real-time and dynamic changes backward external ring power control step-length, can be so that the value of PCT can rapid and precisely converge to suitable value.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (12)
1, a kind of reverse outer-loop power control method, it is characterized in that, system is according to the sub-Bale No. and the termination target of the correct demodulation of packet quilt that receives, at predefined sub-Bale No. and stop target and select the power control step-length that needs in the step-length corresponding relation, dynamically adjust power control gate limit value with concrete the adjustment.
2, a kind of reverse outer-loop power control method as claimed in claim 1 is characterized in that, the sub-Bale No. of described correct demodulation be meant correct demodulating data bag the child bag number of process.
3, a kind of reverse outer-loop power control method as claimed in claim 1 is characterized in that, the acquisition methods of the termination target of the described data that receive is:
From the reverse data bag that receives, obtain transmission mode information, from the access network side, obtain QoS of customer requirement information, determine to stop target according to described transmission mode information and QoS of customer requirement information.
4, a kind of reverse outer-loop power control method as claimed in claim 3, it is characterized in that, described transmission mode and QoS of customer require information and the corresponding relation that stops target by user signing contract information and properties of flow decision, bring the Access Network side when the call setup by core-network side.
5, a kind of reverse outer-loop power control method as claimed in claim 1 is characterized in that, before determining to adjust step-length, described method further comprises:
The data that receive are carried out CRC.
6, a kind of reverse outer-loop power control method as claimed in claim 5 is characterized in that, when check errors, described method further comprises:
Adjust power control gate limit value according to the adjustment step value of predefined check errors correspondence.
7, a kind of reverse outer-loop power control method as claimed in claim 1 is characterized in that, satisfies when setting in advance sub-Bale No. and stopping target and specifically adjust the step-length corresponding relation:
Under static environment, satisfy when necessarily oppositely PER requires, from the process of whole power control, total step-length that total step-length that power control gate limit value raises equals to reduce.
As each described a kind of reverse outer-loop power control method in the claim 1 to 7, it is characterized in that 8, described system is that CDMA EVDO Rev A system is optimized in the data service of A version code division multiple access evolution.
As each described a kind of reverse outer-loop power control method in the claim 1 to 7, it is characterized in that 9, described system is for supporting the system of reserved packet premature termination.
10, a kind of backward external ring power control system comprises the backward external ring power control module, it is characterized in that, described backward external ring power control module comprises:
Power control step-length information stores submodule is used to store packet by the sub-Bale No. of correct demodulation and termination target and the concrete correspondence relationship information of adjusting step-length;
Step-length is adjusted submodule, be used for being searched corresponding power control step-length by the sub-Bale No. of correct demodulation and termination target in described power control step-length information stores submodule stored relation, and send corresponding step-length adjustment information to corresponding entity according to received data packet.
11, a kind of backward external ring power control system as claimed in claim 10 is characterized in that, described backward external ring power control module also comprises:
The user profile sub module stored is used to preserve the quality of service information that the user contracts;
Packet information is obtained submodule, be used for the packet that receiving end/sending end sends, from described packet, obtain user's transmission mode, sub-Bale No. information, and obtain QoS of customer information from the user profile sub module stored, and, send step-length to and adjust submodule according to described transmission mode, the definite target that stops of QoS of customer information.
12, a kind of backward external ring power control system as claimed in claim 10 is characterized in that described system also comprises:
The CRC module is used for the data that receive are carried out CRC, and sends check results to the backward external ring power control module, as the foundation of backward external ring power control.
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|---|---|---|---|
| CNB2006100993132A CN100536363C (en) | 2006-07-13 | 2006-07-13 | Reverse outer-loop power control method and system |
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|---|---|---|---|
| CNB2006100993132A CN100536363C (en) | 2006-07-13 | 2006-07-13 | Reverse outer-loop power control method and system |
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| CN1878019A true CN1878019A (en) | 2006-12-13 |
| CN100536363C CN100536363C (en) | 2009-09-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009074111A1 (en) * | 2007-12-10 | 2009-06-18 | Huawei Technologies Co., Ltd. | Adaptive threshold adjusting method and device |
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2006
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009074111A1 (en) * | 2007-12-10 | 2009-06-18 | Huawei Technologies Co., Ltd. | Adaptive threshold adjusting method and device |
| CN101207461B (en) * | 2007-12-10 | 2011-04-20 | 华为技术有限公司 | Method and apparatus for self-adapting regulation of threshold value |
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| CN100536363C (en) | 2009-09-02 |
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