CN100583673C - Method for determining reverse turn-on channel transmitting time in wireless communication system - Google Patents
Method for determining reverse turn-on channel transmitting time in wireless communication system Download PDFInfo
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- CN100583673C CN100583673C CN200510090769A CN200510090769A CN100583673C CN 100583673 C CN100583673 C CN 100583673C CN 200510090769 A CN200510090769 A CN 200510090769A CN 200510090769 A CN200510090769 A CN 200510090769A CN 100583673 C CN100583673 C CN 100583673C
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Abstract
The invention relates to the method of determining the reverse connecting channel transmitting time in the wireless communicating system. The invention mainly includes: firstly, the ahead period quick real time broadcast message loads the weight of the reverse loading instance information; then, the connecting end gains the reverse load instance information from the said broadcast message, and the reverse connecting channel transmitting time is determined according to the reverse loading instance. So the invention can adjust the transmitting time of the connecting channel effectively, for example, the connecting time of the terminal can be deferred to avoid the loading peak on the instance of the high reverse load. Because of the load deferring several times frequently, the upper connecting power can be adopted to assure the connecting time delaying, so, the connecting speed and the succeeding rate can be improved, the power disturbing can be reduced.
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 time 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 CDMA20001x EV-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 CDMA20001X 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 ProbelnitialAdjust (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, do not adjust constantly according to reverse load for the access of Reverse Access Channel.In fact, when the sector was OL, the possibility of AT (accessing terminal) access failure was very high; Even and even successfully insert, can not allow to set up yet and call out owing to the access control of system.Like this, the calling of AT does not bring very big benefit except having increased to system the more interference.So, when the system reverse load is heavy, the access of AT should be able to be done suitable delay, to avoid the peak of loading.
At present, because the access that can not adjust Reverse Access Channel according to the weight of reverse load constantly, make the access of AT under the part situation influence the performance of network.
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 time in a kind of wireless communication system, thereby can determine suitable reverse turn-on channel transmitting time according to the reverse load situation in real time, have influence on the communication performance of wireless communication system to avoid unnecessary access.
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 time in a kind of wireless communication system, comprising:
A, determine in the wireless communication system reverse load situation information in real time,
The x time of Reverse Access Channel is determined in B, according to the described real-time reverse load situation information adjustment of accessing terminal.
Described steps A comprises:
Carry reverse load situation information in the broadcasting packet periodically fast at forward direction.
Described steps A comprises:
In EV DO system, forward direction is broadcasted Reverse Activity bit RAB carrying reverse load situation information fast by the RA channel;
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 ACTRAB value through Filtering Processing;
B2, calculate based on described result value and to determine reverse turn-on channel transmitting time.
Described step B2 comprises:
B21, determine that according to described ACTRAB value time-delay probable value q is:
Wherein, EmptyThreshold is greater than 0, and ACTRABFactor is the ACTRAB factor, thresholding when BusyThreshold is busy, and EmptyThreshold is idle thresholding.
B22, determine reverse turn-on channel transmitting time according to described q value.
Described step B22 comprises:
B221, when avoiding blocking test, produce the equally distributed random number x between 0 and 1 by access terminal AT;
B222, determine reverse turn-on channel transmitting time according to the size of x value and described q value.
Described step B222 comprises:
When described x value during less than the q value, determine that then AT by avoiding blocking test, continues follow-up access processing procedure, otherwise, be defined as not by avoiding blocking test.
Described step B222 also comprises:
When AT does not surpass predetermined threshold value by the number of times of avoiding blocking test, then AT will improve oppositely access transmitting power according to the predetermined electric power incremental amplitude, and continue to insert, and described power increment range value is issued or predefined by AN.
Described step B222 also comprises:
If AT is not when continuing test and not reaching predetermined thresholding by the number of times sum of avoiding blocking test, then AT will insert with normal access power.
Described step B22 comprises:
B223, the value of original lasting test is made as p, and multiply by described q, obtain p * q;
B224, when continuing test, AT just produces an equally distributed random number x between 0,1, determines reverse turn-on channel transmitting time according to the size of x and described p * q value.
Described step B224 comprises:
If x＜p * q, then AT successfully by avoiding blocking test, continues follow-up access processing procedure, otherwise, be defined as not by avoiding blocking test.
Among the present invention, the filter time constant that in the Filtering Processing process, relates to, and ACTRABFactor, BusyThreshold, EmptyThreshold, power increment amplitude and the threshold information that relates to are issued or are pre-defined by carrying in forward broadcast message by AN.
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 ACTRAB value that draws after the filtering, thereby can adjust the x time of access channel effectively, for example, when reverse load is overweight, the access of hysteresis part A T is to avoid the interference of minimizing access procedure in peak to communication system of loading.
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 1 of method of the present invention
Fig. 2 is the flow chart 2 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 backward channel and insert constantly, when overload, the access operation that the part that lags behind accesses terminal, thereby the raising access efficiency, and can reduce interference in the communication system.
Of the present invention mainly is to utilize wireless communication system to broadcast reverse load situation information in the broadcasting packet periodically fast at forward direction.The scanning broadcasting packet that accesses terminal obtains reverse load situation information, and according to this reverse load situation parameter information, adjusts the access moment of terminal.
What the present invention was suitable for includes but not limited to: EVDO and multicarrier EVDO system.
The present invention for avoiding that existing protocol is had more change, specifically can adopt the field of reserving in existing broadcast AccessParameters message to carry corresponding reverse load situation parameter information in the specific implementation process.
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 time 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 forward direction periodic broadcast message carrying reverse load situation;
Simultaneously can also in described broadcast, carry following parameter:
Filter time constant ACTRABFilterTC, ACTRABFactor (the ACTRAB factor), BusyThreshold (thresholding when hurrying), EmptyThreshold (idle thresholding), LoadAdjust (power increment), DelayTimeLimit (decay time thresholding) or the like;
Specifically can in the AccessParameters message that AN issues, increase some fields, be used to carry above-mentioned each parameter information, as utilize the last reverse of this message (reservation) field;
Certainly, these parameters also can predefineds and are not issued as message.
The soft-decision-value SoftRAB that step 12:AT physical layer periodicity (as every time slot or some time slots) provides the forward direction RAB of current goal sector (being the sector that AT prepares it is sent access channel) to receive;
This step is for adopting existing techniques in realizing.
Step 13: with this SoftRAB value elapsed time constant is the filter filtering of ACTRABFilterTC, obtains ACTRAB;
Promptly in this step with RAB through after the Filtering Processing, just can obtain to reflect the parameter of reverse load situation, so that accurately determine reverse turn-on channel transmitting time according to this parameter, the filter that Filtering Processing adopts can be that time constant is the iir filter of ACTRABFilterTC;
Wherein, the ACTRABFilterTC parameter is issued by AN, perhaps predefined.
Step 14: obtain Delay Probability (time-delay probability) by ACTRAB, be made as q, principle is when system busy, reduces the q value, access is lagged behind with bigger probability, thereby avoid the peak of loading;
Mathematical formulae can be tabled look-up or use to computational methods, below for example as:
Wherein, guarantee that generally EmptyThreshold is greater than 0.
Step 15:AT is before the emission of the 1st access exploration probe of Reverse Access Channel, after AT successfully passes through Silence Period Test (quiet period test) and Persistence Test (continuing test), execution in step 16 again, carry out an AvoidCongestionTest (avoiding blocking test);
If AT does not reach under the situation of thresholding in Silence Period Test (quiet period test) failure or in PersistenceTest (the continuing test) failure and the frequency of failure, AT can postpone access, constantly all tests again to next the access again.
Step 16:AT produces an equally distributed random number x between (0,1);
Step 17: whether judge x less than q, if x＜q, then AT has just successfully passed through to avoid blocking test, execution in step 18, otherwise, execution in step 19.
Step 18:AT then proceeds access process subsequently by avoiding blocking test;
Step 19:AT avoids the blocking test failure.
If AT not by avoiding blocking test, then also needs to adopt processing procedure as shown in Figure 2:
Step 21: judge AT avoids the number of times of blocking test failure whether to surpass predetermined value, has surpassed certain thresholding when AT avoids the number of times of blocking test failure, DelayTimeLimit for example, then execution in step 22, otherwise, execution in step 23:
Step 22:AT will continue to insert with higher transmitting power, and promptly AT improves transmitting power and continues access, for example, increase a power increment on original open Loop Power control, be made as LoadAdjust, and this parameter can be by default;
This moment, transmitting power was Y=X
0+ (i-1) * PowerStep+LoadAdjust.
Step 23: judge ATPersistence Test (the continuing test) frequency of failure and avoid blocking test frequency of failure summation whether to arrive certain threshold value, if reach, execution in step 24, otherwise, execution in step 25;
Step 24:AT still can continue to insert, and is specially AT and adopts common mode not change transmitting power continuation access.
Step 25:AT just abandons this time inserting, and when next access arrives constantly, continues SilencePeriod Test (quiet period test) and avoids blocking test (AvoidCongestionTest); But, no longer carry out Persistence Test (continuing test).
Among the present invention, avoid blocking test (AvoidCongestionTest) also can combine with Persistence Test (continuing test), for example, original persistenceprobability (its value is made as p) be multiply by again the Delay Probability (being made as q) of above-mentioned acquisition, when continuing test, AT just produces an equally distributed random number x between (0,1), if x＜p * q, AT have just successfully passed through to avoid blocking test.Other steps all are same as and continue test, and the front is described, and no longer describe in detail herein.
For ease of understanding, will the procurement process and the effect thereof of described p value be described in detail below such scheme.
According to the agreement regulation as can be known, in the DO system, AN can broadcast AccessParametersmessage, and it is APerrsistence (its value is made as n) that a field is wherein arranged.If n equals 0x3F, then persistence probability (its value is made as p) is 0; Otherwise p=2
-n/4
AT carries out persistencetest (continuing test) earlier before the emission of the 1st access exploration probe of Reverse Access Channel.If p=0, AT end this time to insert.If p is not equal to 0, AT just produces an equally distributed random number x between (0,1), if x＜p, AT has just successfully passed through the test that lags behind.
Surpassed 4/p if AT has passed through the number of times of lasting test or the lasting test crash of AT, AT just proceeds access process subsequently; Otherwise AT just abandons this time inserting, and continues when next access arrives constantly again.
The purpose that continues test is to reduce the probability of access channel collision, when the system cut-in channel load is heavy, AN should increase the value of APersistence field among the AccessParameters message, promptly reduce Persistence Probability, allow more AT not by continuing test, thereby being inserted, this part AT lags behind, to avoid inserting collision.
In sum, the present invention can more promptly reflect current reverse load by the soft-decision-value of forward direction RAB through the ACTRAB that draws after the filtering, therefore, the present invention can adjust the x time of access channel effectively, thereby improve access speed and success rate, and reduce of the interference of non-essential AT access procedure communication system.
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 (8)
1, determine the method for reverse turn-on channel transmitting time in a kind of wireless communication system, it is characterized in that, comprising:
A, determine in the wireless communication system reverse load situation information in real time,
The x time of Reverse Access Channel is determined in B, according to the described real-time reverse load situation information adjustment of accessing terminal;
Described steps A comprises:
In EV DO system, forward direction is broadcasted Reverse Activity bit RAB carrying reverse load situation information fast by the RA channel;
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 ACTRAB value through Filtering Processing;
B2, calculate based on described result value and to determine reverse turn-on channel transmitting time;
Described step B2 comprises:
B21, determine that according to described ACTRAB value time-delay probable value q is:
Wherein, EmptyThreshold is greater than 0, and ACTRABFactor is the ACTRAB factor, thresholding when BusyThreshold is busy, and EmptyThreshold is idle thresholding;
B22, determine reverse turn-on channel transmitting time according to described q value.
2, determine the method for reverse turn-on channel transmitting time in the wireless communication system according to claim 1, it is characterized in that described step B22 comprises:
B221, when avoiding blocking test, produce the equally distributed random number x between 0 and 1 by access terminal AT;
B222, determine reverse turn-on channel transmitting time according to the size of x value and described q value.
3, determine the method for reverse turn-on channel transmitting time in the wireless communication system according to claim 2, it is characterized in that described step B222 comprises:
When described x value during less than the q value, determine that then AT by avoiding blocking test, continues follow-up access processing procedure, otherwise, be defined as not by avoiding blocking test.
4, determine the method for reverse turn-on channel transmitting time in the wireless communication system according to claim 3, it is characterized in that described step B222 also comprises:
When AT does not surpass predetermined threshold value by the number of times of avoiding blocking test, then AT will improve oppositely access transmitting power according to the predetermined electric power incremental amplitude, and continue to insert, and described power increment range value is issued or predefined by AN.
5, determine the method for reverse turn-on channel transmitting time in the wireless communication system according to claim 2, it is characterized in that described step B222 also comprises:
If AT is not when continuing test and not reaching predetermined thresholding by the number of times sum of avoiding blocking test, then AT will insert with normal access power.
6, determine the method for reverse turn-on channel transmitting time in the wireless communication system according to claim 1, it is characterized in that described step B22 comprises:
B223, the value of original lasting test is made as p, and multiply by described q, obtain p * q;
B224, when continuing test, AT just produces an equally distributed random number x between 0,1, determines reverse turn-on channel transmitting time according to the size of x and described p * q value.
7, determine the method for reverse turn-on channel transmitting time in the wireless communication system according to claim 6, it is characterized in that described step B224 comprises:
If x＜p * q, then AT successfully by avoiding blocking test, continues follow-up access processing procedure, otherwise, be defined as not by avoiding blocking test.
8, according to the method for determining reverse turn-on channel transmitting time in each described wireless communication system of claim 1 to 7, it is characterized in that, the filter time constant that in the Filtering Processing process, relates to, and ACTRABFactor, BusyThreshold, EmptyThreshold, power increment amplitude and the threshold information that relates to are issued or are pre-defined by carrying in forward broadcast message by AN.
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