CN1862987B - Method for determining reverse turn-on channel transmitting power in wireless communication system - Google Patents
Method for determining reverse turn-on channel transmitting power in wireless communication system Download PDFInfo
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- CN1862987B CN1862987B CN2005100907679A CN200510090767A CN1862987B CN 1862987 B CN1862987 B CN 1862987B CN 2005100907679 A CN2005100907679 A CN 2005100907679A CN 200510090767 A CN200510090767 A CN 200510090767A CN 1862987 B CN1862987 B CN 1862987B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the method of detecting the reverse connecting channel beaming in the wireless communicating system. The invention mainly includes: firstly, the ahead seasonal quick real time broadcast message bears the weight of the reverse loading instance information; then, the connecting end gains the reverse load instance information from the said broadcast message, the corresponding reverse connecting channel delivering power can be adjusted and determined by the reverse loading instance, furthermore, the parameter needed by the connecting end adjusting arithmetic can be broadcasted through the system message. So the invention can adjust effectively the beaming power of the connecting channel according to the current real time reverse loading instance, for example, when the reverse load is heavier, the beaming power of the connecting channel can be added properly, in this way, the connecting speed and the succeeding rate can be improved, the power disturbing can be reduced. And, the invention adopts the existing key word of the broadcasting message to pass the parameter information needed by the invention, so the agility and the afterward compatibility can be assured.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the method for determining reverse turn-on channel transmitting power in a kind of wireless communication system.
Background technology
In mobile radio system, terminal is all finished the transmission of initialization signaling or short message usually by Reverse Access Channel.Owing to do not set up two-way connection between terminal and the system before this,, determine back emitted power so terminal can only be finished the power setting of access channel according to open Loop Power control.
Described open loop power value depends on the path loss and the reverse load of forward link, if the reverse load height then should insert with more high-power, to guarantee the access success rate and to shorten access delay; Otherwise,, then can be unlikely to cause large disturbance with less power access if reverse load is light.
In system, for current reverse load situation, system can broadcast in system message usually, and like this, terminal just can determine access power by open Loop Power control according to this load condition.Yet the broadcasting of system message is long at interval usually, causes broadcast can't accurately and timely reflect the quick variation of reverse load.Therefore, the open loop power of the access channel of determining based on the reverse load situation just can't accurately obtain, and then makes and can't determine rational back emitted power.
Be the method for adjustment of example with CDMA2000 1xEV-DO system below to backward channel transmitting power in the wireless communication system.
According to agreement regulation, the transmitting power Y of EV-DO (system that CDMA2000 1X is strengthened in data service) i access exploration probe of system reverse access channel is produced by following formula:
Y＝X
0+(i-1)×PowerStep；
Wherein:
X
0＝-Mean_Rx_Power(dBm)+OpenLoopAdjust+ProbeInitialAdjust；
PowerStep (power increment), OpenLoopAdjust (open loop adjustment) that relates in above-mentioned two formula and ProbeInitialAdjust (access exploration is initially adjusted) parameter are the field among the forward direction AccessParameters message (access parameter messages).The concrete numerical value of each parameter is determined by AN (Access Network), and be handed down to by AccessParameters message and access terminal, access terminal like this and just can from AccessParameters message, obtain relevant parameters information, and then calculate the transmitting power Y that obtains access exploration.
In system, the interval that AN sends AccessParameters message must not surpass N
ACMPAccessParametersIndividual time slot.General N
ACMPAccessParametersDefault value be 768.
Describe as can be known from the front, in communication system, when reverse load is lighter, access channel need adopt less power just can successfully insert, thereby avoids other users and sub-district were caused large disturbance; Otherwise,, then should adopt more high-power access, otherwise will reduce the access success rate when load is heavier.Therefore, the set value of the power of Reverse Access Channel should adapt to reverse load variations rapidly.
Yet, in the 1xEVDO agreement, the set value of the power of Reverse Access Channel is only relevant with the field among the forward direction AccessParameters message, and the renewal of this message interval is in the magnitude of a hundreds of time slot, therefore, the set value of the power of Reverse Access Channel can't adapt to reverse load variations rapidly, will inevitably cause access failure, delay thus or produce large disturbance, thereby have influence on the communication performance of wireless communication system.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide the method for determining reverse turn-on channel transmitting power in a kind of wireless communication system, thereby can be in real time according to the reverse load situation adjustment determine rational reverse turn-on channel transmitting power, to improve the success rate of reverse access, improve the communication performance of wireless communication system.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides the method for determining reverse turn-on channel transmitting power in a kind of wireless communication system, comprising:
A, determine in the wireless communication system reverse load situation information in real time,
Reverse turn-on channel transmitting power is determined in B, the adjustment that accesses terminal according to described real-time reverse load situation information.
Described steps A comprises:
Carry reverse load situation information in the broadcasting packet periodically fast at forward direction.
Described steps A comprises:
In the EV-DO system, by the periodically quick broadcasting packet broadcasting of forward direction Reverse Activity bit RAB carrying reverse load situation information;
Access terminal and periodically obtain the soft-decision-value SoftRAB of the forward direction Reverse Activity bit RAB reception of current goal sector by physical layer.
Described step B comprises:
B1, described soft-decision-value SoftRAB is obtained result value ACPRAB through Filtering Processing;
B2, calculate based on described result value and to determine reverse turn-on channel transmitting power.
Described step B2 comprises:
Calculate the property taken advantage of correction value PowerStepMAdjustRAB and the power correction value RABAdjust of corresponding power increment PowerStep respectively according to described Filtering Processing end value ACPRAB;
The property taken advantage of correction value PowerStepMAdjustRAB and power correction value RABAdjust according to described PowerSrep calculate definite reverse turn-on channel transmitting power.
Described step B2 specifically comprises:
B21, determine that the PowerStepMAdjustRAB value is:
Determine that also the RABAdjust value is:
RABAdjust＝ACPRAB×RABAdjustFactor；
Wherein, RABAdjustFactor is a regulatory factor, gain when BusyGain is busy, and thresholding when BusyThreshold is busy, EmptyGain are the free time gain, EmptyThreshold is idle thresholding;
The transmitting power Y of B22, i access exploration of computing system Reverse Access Channel is:
Y＝X
0+(i-1)×PowerStep×PowerStepM?AdjustRAB；
Wherein:
X
0＝-Mean_Bx_Power(dBm)+OpenLoopAdjust+ProbeInitialAdjust+RABAdjust；
PowerStep is the power increment parameter, and OpenLoopAdjust is that parameter value is adjusted in open loop, and ProbeInitialAdjust is that access exploration is initially adjusted parameter value, and each parameter is issued by Access Network AN.
The filter time constant that needs in the described Filtering Processing process, and RABAdjustFactor, BusyGain, BusyThreshold, EmptyGain and EmptyThreshold parameter are to be carried in forward broadcast message by AN to issue or pre-defined.
Described step B2 comprises:
Calculate additivity correction value PowerStepAAdjustRAB and the power correction value RABAdjust of corresponding power increment PowerStep respectively according to described Filtering Processing end value ACPRAB;
Additivity correction value PowerStepAAdjustRAB and power correction value RABAdjust according to described PowerStep calculate definite reverse turn-on channel transmitting power.
Described step B2 specifically comprises:
B23, determine that additivity correction value PowerStepAAdjustRAB is:
Wherein, PowerStep and PowerStepAAdjustRAB and greater than 0;
Determine that also the RABAdjust value is: RABAdjust=ACPRAB * RABAdjustFactor;
B24, calculating determine that the transmitting power Y of i access exploration of Reverse Access Channel is:
Y＝X
0+(i-1)×(PowerStep+PowerStepAAdjustRAB)。
As seen from the above technical solution provided by the invention, soft-decision-value by forward direction RAB among the present invention accurately more promptly reflects current reverse load through the ACPRAB value that draws after the filtering, thereby can adjust the transmitting power of access channel effectively, like this, both access speed and success rate can be improved, power disturbance can also be reduced.
And the reserved field owing to the existing AccessParameters message of employing among the present invention transmits the parameter information of wanting required for the present invention, thereby has guaranteed the flexibility and the backward compatibility that realize.
Description of drawings
Fig. 1 is the flow chart of method of the present invention.
Embodiment
Core of the present invention is the reverse load situation according to the wireless communication system periodic broadcast of accessing terminal, adjust open Loop Power control, make the set value of the power of Reverse Access Channel can adapt to reverse load variations rapidly, thereby improve access speed, and reduce and disturb.
At present, in the EV-DO system, AN can (relevant reverse load situation accesses terminal by forward direction RACH (ReverseActivity Channel, Reverse Activity channel) channel radio RAB (Reverse Activity Bit, Reverse Activity bit) notice AT at each time slot.And for increasing the accuracy that receives, AN (Access Network) can transmit same RAB in the individual time slot of continuous RABLength (RAB is long).Whether this RAB indicates current sector reverse load overweight, and on behalf of the sector reverse load, RAB 1 exceed standard, and on behalf of the sector reverse load, RAB 0 do not exceed standard.
The present invention utilizes above-mentioned wireless communication system to broadcast reverse load situation parameter information in the broadcasting packet periodically fast at forward direction just, adjust open Loop Power control, make the set value of the power of Reverse Access Channel can adapt to reverse load variations rapidly, thereby the raising access speed, and reduce and disturb.
What the present invention was suitable for includes but not limited to: EVDO and multicarrier EVDO system.
For method of the present invention is had further understanding, will be that the present invention will be described for example below with the adjustment processing procedure of the reverse turn-on channel transmitting power in the EV-DO system.
The specific implementation process of method of the present invention may further comprise the steps as shown in Figure 1:
Step 11: broadcast to terminal by crossing forward direction RA channel fast cycle broadcast carrying reverse load situation;
Simultaneously, the following parameter of carrying in can also the forward broadcast message in wireless communication system:
Filter time constant ACPRABFilterTC, RABAdjustFactor (regulatory factor), BusyGain (gain when hurrying), BusyThreshold (thresholding when hurrying), EmptyGain (idle gain) and EmptyThreshold (idle thresholding) etc.;
Illustrate, described filter time constant ACPRABFilterTC can get the 2bit field, and this value 0b00,0b01,0b10,0b11 can correspond to 4,8,16,32 etc. respectively;
In this step, specifically can in the AccessParameters message that AN issues, increase some field carrying above-mentioned parameter information, for example, can utilize the last reverse of this message (reservation) field carrying relevant parameters information;
Simultaneously, realize the transmission of reverse load situation parameter information if adopt the reserved field of existing AccessParameters message, can also guarantee the flexibility and the backward compatibility of EV-DO system, make the present invention in the specific implementation process, need not to increase new signaling message;
Certainly, described each parameter also can be predefined, like this, then need not the field in the broadcast is expanded.
Step 12:AT (accessing terminal) physical layer periodically (as every time slot or some time slots) provides the soft-decision-value SoftRAB of the forward direction RAB reception of current goal sector (being the sector that AT prepares it is sent access channel) to give AT;
This step adopts prior art promptly can realize.
Step 13: the filter that is ACPRABFilterTC with described SoftRAB value elapsed time constant carries out Filtering Processing, and is worth accordingly and is that ACPRAB, this filter can be that time constant is the iir filter of ACPRABFilterTC;
Wherein, ACPRABFilterTC is that parameter is issued by AN, for obtaining in step 11.
Step 14: the property the taken advantage of correction value PowerStepMAdjustRAB according to described ACPRAB calculates PowerStep is specifically as follows:
Each value of right-hand member obtains for being issued by AN in step 11 in the mapping table, also can be in advance on AT configuration concrete parameter value accordingly;
Described PowerStepMAdjustRAB value need be determined concrete numerical value respectively according to the difference of the situations such as busy, spare time of system.
Step 15: the power correction value RABAdjust that calculates access channel according to ACPRAB:
RABAdjust＝ACPRAB×RABAdjustFactor；
Wherein, RABAdjustFactor is a parameter, is issued by AN, obtains in step 11, and for example, RABAdjustFactor can be 5;
In addition, also can adopt the mode of form mapping to be mapped to RABAdjust from ACPRAB, this form can be issued or predefined by AccessParameters message.
Step 16: calculate the reverse turn-on channel transmitting power value according to the described property taken advantage of correction value PowerStepMAdjustRAB and power correction value RABAdjust;
The transmitting power Y of i access exploration probe of DO system reverse access channel is:
Y＝X
0+(i-1)×PowerStep×PowerStepM?AdjustRAB；
Wherein:
X
0＝-Mean_Bx_Power(dBm)+OpenLoopAdjust+ProbeInitialAdjust+RABAdjust；
PowerStep, OpenLoopAdjust in above-mentioned two formula and ProbeInitialAdjust are the fields among the forward direction AccessParameters message, are determined and are issued by AN;
As can be seen, in this step, the described reverse turn-on channel transmitting power that calculating obtains has been introduced the property taken advantage of correction value PowerStepMAdjustRAB and the power correction value RABAdjust based on the reverse load parameter information, makes that calculating the reverse turn-on channel transmitting power accuracy that obtains improves greatly.
Like this, the present invention has reasonably introduced reverse load situation information by above-mentioned steps 11 to step 16, thereby can calculate reverse turn-on channel transmitting power accurately, thus effectively improve the success rate that oppositely inserts, and can reduce the interference in the reverse access procedure.
Need to prove, in above-mentioned steps 14, can also change into the additivity correction value PowerStepAAdjustRAB that obtains PowerStep according to ACPRAB:
The above table mapping must guarantee: PowerStep+PowerStepAAdjustRAB is greater than 0.B parameter usyGain in the formula, BusyThreshold, EmptyGain, EmptyThreshold can be issued (referring to the description of preceding step 11) or also can predefined by AccessParameters message.
If obtain the additivity correction value PowerStepAAdjustRAB of PowerStep by ACPRAB, then the transmitting power Y of i access exploration probe of DO system reverse access channel is:
Y＝X
0+(i-1)×(PowerStep+PowerStepAAdjustRAB)；
The implication front of each parameter is described in the formula, describes in detail no longer one by one herein.
In sum, the present invention can more promptly reflect current reverse load by the soft-decision-value of forward direction RAB through the AGPRAB that draws after the filtering, therefore, the present invention can adjust the transmitting power of access channel effectively, comprise the power increment PowerStep between the exploration of Initial Trans Xo and neighboring access, thereby improve access speed and success rate, and reduce power disturbance.
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 (4)
1. determine the method for reverse turn-on channel transmitting power in the wireless communication system, it is characterized in that, comprising:
A, access terminal and periodically obtain the soft-decision-value that the forward direction Reverse Activity bit of current goal sector receives by physical layer,
B1, accessing terminal obtains the result value with described soft-decision-value through Filtering Processing;
B2, access terminal and calculate the property the taken advantage of correction value of corresponding power correction value and power increment or the additivity correction value of power increment respectively according to described Filtering Processing end value;
Calculate definite reverse turn-on channel transmitting power according to the property the taken advantage of correction value of described power correction value and power increment or the additivity correction value of power increment;
Described B2 specifically comprises:
B21, determine that the property the taken advantage of correction value PowerStepMAdjustRAB of power increment is:
Determine that also power correction value RABAdjust is:
RABAdjust＝ACPRAB×RABAdjustFactor；
Wherein, RABAdjustFactor is a regulatory factor, gain when BusyGain is busy, and thresholding when BusyThreshold is busy, EmptyGain are the free time gain, EmptyThreshold is idle thresholding;
The transmitting power Y of B22, i access exploration of computing system Reverse Access Channel is:
Y＝X
0+(i-1)×PowerStep×PowerStepMAdjustRAB；
Wherein:
X
0＝-Mean_Rx_Power(dBm)+OpenLoopAdjust+ProbeInitialAdjust+RABAdjust；
Powerstep is the power increment parameter, and OpenLoopAdjust is that parameter value is adjusted in open loop, and ProbeInitialAdjust is that access exploration is initially adjusted parameter value, and each parameter is issued by Access Network AN;
Perhaps, described B2 specifically comprises:
B23, determine that the additivity correction value PowerStepAAdjustRAB of power increment is:
Wherein, PowerStep and PowerStepAAdjustRAB and greater than 0;
Determine that also the RABAdjust value is: RABAdjust=ACPRAB * RABAdjustFactor;
B24, calculating determine that the transmitting power Y of i access exploration of Reverse Access Channel is:
Y＝X
0+(i-1)×(PowerStep+PowerStepAAdjustRAB)。
2. determine the method for reverse turn-on channel transmitting power in the wireless communication system according to claim 1, it is characterized in that described steps A comprises:
Carry reverse load situation information in the broadcasting packet periodically fast at forward direction.
3. determine the method for reverse turn-on channel transmitting power in the wireless communication system according to claim 1, it is characterized in that described steps A comprises:
In the EV-DO system, by the periodically quick broadcasting packet broadcasting of forward direction Reverse Activity bit RAB carrying reverse load situation information;
Access terminal and periodically obtain the soft-decision-value SoftRAB of the forward direction Reverse Activity bit RAB reception of current goal sector by physical layer.
4. determine the method for reverse turn-on channel transmitting power in the wireless communication system according to claim 1, it is characterized in that, the filter time constant that needs in the described Filtering Processing process, and RABAdjustFactor, BusyGain, BusyThreshold, EmptyGain and EmptyThreshold parameter are to be carried in forward broadcast message by AN to issue or pre-defined.
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