CN102202399B - Method for adjusting channel expecting carrier-to-interference ratio and apparatus thereof - Google Patents
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Abstract
The invention discloses a method for adjusting a channel expecting carrier-to-interference ratio in order to realize an adaptive adjusting of a PRACH channel expecting carrier-to-interference ratio. The method comprises the following steps: obtaining a received ratio during a random access process; determining whether the received ratio is within a preset acceptable range of a received ratio; if so, maintaining the PRACH channel expecting carrier-to-interference ratio; if not, adjusting the PRACH channel expecting carrier-to-interference ratio so as to make the received ratio be changed towards the received ratio acceptable range. Besides, the invention also discloses an apparatus used for realizing the method of the invention.
Description
Technical field
The present invention relates to the communications field, particularly relate to method and the device of adjusting channel expectation carrier/interface ratio.
Background technology
In TD-SCDMA (TD SDMA access), PRACH (Physical Random Access Channel) channel expectation carrier/interface ratio is the configurable parameter of network side, is used for calculating TXPA (expectation power level) value.UE determines transmitting power in PRACH according to the TXPA value.The TXPA value sends to UE (subscriber equipment) by network side in random access procedure.
Random access procedure comprises: UE selects uplink synchronisation sign indicating number (SYNC-UL), and initiates synchronization request at UpPCH.Base station (Node B) detection SYNC-UL, initiation is regularly adjusted and power adjustment indication, by FPACH (physical access channel) timing adjustment amount and power adjustment indication is sent to UE, also transmits information as shown in table 1 among the FPACH.UE adjusts transmitting power and emission timing according to the indication of receiving, and initiates to insert at random by RACH (Random Access Channel).Channel allocation is carried out after receiving and inserting request at random in the base station, and notifies UE with the resource of distributing by FACH (forward access channel).
Table 1
| Reserved bits (default value:0) (reserved bit position) | The 9(low level) |
Wherein TXPA is the expectation power level of the last emission of the P-RACH RACH message of FPACH association.The base station is passed through
And C/I
DesCalculate TXPA, computing formula is:
Wherein, C/I
DesExpression PRACH channel expectation carrier/interface ratio is a kind of Operation and Maintenance configuration parameter,
Average time slot interference power for PRACH place time slot.
Parameters C/I
DesDispose the excessive or too small negative effect that has.But because the complexity of wireless environment, if dispose the optimal value that the PRACH channel is expected carrier/interface ratio respectively at each residential quarter, the workload of adjusting parameter by site assessment is huge; And the optimal value adjustment also can not be got caught up in the variation of residential quarter wireless environment.In real network, insert success rate in order to guarantee terminal, general bigger PRACH channel expectation carrier/interface ratio parameter configuration, but configuration like this, may cause the PRACH transmitted power excessive, increase terminal power consumption, elevator system is disturbed.
Summary of the invention
The embodiment of the invention provides a kind of method and device of adjusting channel expectation carrier/interface ratio, is used for realizing the self adaptation adjustment of PRACH channel expectation carrier/interface ratio.
A kind of method of adjusting channel expectation carrier/interface ratio may further comprise the steps:
Obtain the reception success rate in the random access procedure;
Judge to receive success rate whether in default reception success rate tolerance interval, if, then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make to receive success rate and change to receiving the success rate tolerance interval;
Judge remain unchanged or adjust after PRACH channel expectation carrier/interface ratio whether in default channel expectation carrier/interface ratio tolerance interval, if, then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make PRACH channel expectation carrier/interface ratio after the adjustment in default channel expectation carrier/interface ratio tolerance interval.
A kind of base station comprises:
Acquisition module is for the reception success rate that obtains random access procedure;
Adjusting module, be used for to judge receive success rate whether in default reception success rate tolerance interval, if then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make to receive success rate to receiving the variation of success rate tolerance interval;
Wherein, described adjusting module also be used for to judge remain unchanged or adjust after PRACH channel expectation carrier/interface ratio whether in default channel expectation carrier/interface ratio tolerance interval, if, then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make PRACH channel expectation carrier/interface ratio after the adjustment in default channel expectation carrier/interface ratio tolerance interval.
The embodiment of the invention is adjusted PRACH channel expectation carrier/interface ratio according to inserting success rate, realized the self adaptation adjustment of PRACH channel expectation carrier/interface ratio, made PRACH channel expectation carrier/interface ratio after the adjustment near the optimal value of PRACH channel expectation carrier/interface ratio under the current network environment.
Description of drawings
Fig. 1 is the main method flow chart of adjusting channel expectation carrier/interface ratio in the embodiment of the invention;
Fig. 2 is the method detailed flow chart of adjusting channel expectation carrier/interface ratio in the embodiment of the invention;
Fig. 3 is the method flow diagram of adjusting channel expectation carrier/interface ratio in the embodiment of the invention by two scopes;
Fig. 4 is the structure chart of base station in the embodiment of the invention.
Embodiment
The embodiment of the invention is adjusted PRACH channel expectation carrier/interface ratio according to inserting success rate, realized the self adaptation adjustment of PRACH channel expectation carrier/interface ratio, made PRACH channel expectation carrier/interface ratio after the adjustment near the optimal value of PRACH channel expectation carrier/interface ratio under the current network environment.
Referring to Fig. 1, the main method flow process of adjusting channel expectation carrier/interface ratio in the present embodiment is as follows:
Step 101: obtain the reception success rate in the random access procedure.
Step 102: judge to receive success rate whether in default reception success rate tolerance interval, if then continue step 103, otherwise continue step 104.
Step 103: keep PRACH channel expectation carrier/interface ratio constant.
Step 104: adjust PRACH channel expectation carrier/interface ratio, make to receive success rate to receiving the variation of success rate tolerance interval.Concrete, when receiving success rate greater than receiving going up in limited time of success rate tolerance interval, reduce PRACH channel expectation carrier/interface ratio according to default downward modulation step-length; Prescribe a time limit less than receiving the following of success rate tolerance interval when receiving success rate, improve PRACH channel expectation carrier/interface ratio according to default rise step-length.
Referring to Fig. 2, the method detailed flow process of adjusting channel expectation carrier/interface ratio in the present embodiment is as follows:
Step 201: the inherent FPACH of statistics one-period goes up the number that sends message and the number of the feedback that receives at RACH or PRACH.The number that sends message at FPACH is the number of the feedback that receive at RACH or PRACH.Wherein, the described cycle was configurable parameter, as 60 minutes.
Step 202: according to feedback number and the ratio that sends number, obtain to receive success rate.That is, the actual feedback number of receiving is reception success rate received_ratio (n) with the percentage of the receivable feedback that arrives.
Step 203: judge to receive success rate received_ratio (n) whether greater than the upper limit of default reception success rate tolerance interval, if then continue step 204, otherwise continue step 205.Received_ratio_threshold represents channel expectation carrier/interface ratio threshold value, UpTH represents upper limit amplitude, be limited to received_ratio_threshold+UpTH on the reception success rate tolerance interval, judge that namely whether received_ratio (n) is greater than received_ratio_threshold+UpTH.
Step 204: reduce the expectation of PRACH channel carrier/interface ratio, i.e. C/I according to default downward modulation step-length
Des(n+1)=C/I
Des(n)-and step_down, C/I
Des(n) the PRACH channel expectation carrier/interface ratio before expression is adjusted, C/I
Des(n+1) the PRACH channel expectation carrier/interface ratio after expression is adjusted, step_down represents to reduce step-length.
Step 205: judge to receive success rate received_ratio (n) whether less than the lower limit of default reception success rate tolerance interval, if then continue step 206, otherwise continue step 207.DwTH represents the lower limit amplitude, receives the following received_ratio_threshold-DwTH that is limited to of success rate tolerance interval, judges that namely whether received_ratio (n) is less than received_ratio_threshold-DwTH.
Step 206: improve PRACH channel expectation carrier/interface ratio according to default rise step-length.Be C/I
Des(n+1)=C/I
Des(n)+and step_up, step_up represents to raise step-length.
Step 207: keep PRACH channel expectation carrier/interface ratio constant.Be C/I
Des(n+1)=C/I
Des(n).
In flow process shown in Figure 2, only adjusted PRACH channel expectation carrier/interface ratio one time, reception success rate after whether the PRACH channel expectation carrier/interface ratio after can't determine to adjust this moment can guarantee is in receiving the success rate tolerance interval, therefore in order further to make PRACH channel expectation carrier/interface ratio near optimal value, PRACH channel expectation carrier/interface ratio and default channel can be expected the carrier/interface ratio tolerance interval relatively, the specific implementation process is referring to the following examples.
Referring to Fig. 3, adjust channel by two scopes in the present embodiment and expect that the method flow of carrier/interface ratio is as follows:
For example, the carrier/interface ratio of the PRACH channel of n expectation constantly is C/Ides (n), the success rate of the RACH/PRACH of n reception constantly is received_ratio (n), pre-configured following parameters: the minimum value of PRACH channel expectation carrier/interface ratio tolerance interval is C/Ides_min (as 0db), the maximum of PRACH channel expectation carrier/interface ratio tolerance interval is C/Ides_max (as 5db), it is step_up (as 1db) that PRACH channel expectation carrier/interface ratio raises step-length, PRACH channel expectation carrier/interface ratio downward modulation step-length is step_down (as 0.5db), it is received_ratio_threshold (as 99%) that RACH/PRACH receives the success rate thresholding, it is UpTH (as 0.5%) that RACH/PRACH receives the success rate fluctuation upper limit (or deserving to be called the amplitude limit degree), and it is DwTH (as 0.5%) that RACH/PRACH receives success rate fluctuation lower limit (or claiming the lower limit amplitude).
Step 301: obtain the reception success rate in the random access procedure.Detailed process is referring to step 201 and 202.
Step 302: judge to receive success rate received_ratio (n) whether greater than the upper limit of default reception success rate tolerance interval, if then continue step 303, otherwise continue step 304.Judge that namely whether received_ratio (n) is greater than received_ratio_threshold+UpTH.
Step 303: reduce the expectation of PRACH channel carrier/interface ratio, i.e. C/I according to default downward modulation step-length
Des(n+1)=C/I
Des(n)-step_down.Continue step 307.
Step 304: judge to receive success rate received_ratio (n) whether less than the lower limit of default reception success rate tolerance interval, if then continue step 305, otherwise continue step 306.Judge that namely whether received_ratio (n) is less than received_ratio_threshold-DwTH.
Step 305: improve PRACH channel expectation carrier/interface ratio according to default rise step-length.Be C/I
Des(n+1)=C/I
Des(n)+and step_up, step_up represents to raise step-length.Continue step 307.
Step 306: keep PRACH channel expectation carrier/interface ratio constant.Be C/I
Des(n+1)=C/I
Des(n).Continue step 307.
Step 307: judge that PRACH channel expectation carrier/interface ratio is whether greater than the upper limit of default channel expectation carrier/interface ratio tolerance interval, if then continue step 308, otherwise continue step 309.That is, judge C/I
Des(n+1) whether greater than C/I
Des_ max.
Step 308: the upper limit of PRACH channel expectation carrier/interface ratio being adjusted to channel expectation carrier/interface ratio tolerance interval.That is C/I,
Des(n+1)=C/I
Des_ max.
Step 309: judge that PRACH channel expectation carrier/interface ratio is whether less than the lower limit of default channel expectation carrier/interface ratio tolerance interval, if then continue step 310, otherwise continue step 311.That is, judge C/I
Des(n+1) whether less than C/I
Des_ min.
Step 310: the lower limit of PRACH channel expectation carrier/interface ratio being adjusted to channel expectation carrier/interface ratio tolerance interval.That is C/I,
Des(n+1)=C/I
Des_ min.
Step 311: keep PRACH channel expectation carrier/interface ratio constant.Be C/I
Des(n+1)=C/I
Des(n).
Can expect carrier/interface ratio by the PRACH channel that step 308,309 or 311 obtains then, calculate TXPA.
Understood the implementation procedure of adjusting PRACH channel expectation carrier/interface ratio by above description, this process mainly realizes that by the base station internal structure and the function to the base station is introduced below.
Referring to Fig. 4, the base station comprises in the present embodiment: acquisition module 401 and adjusting module 402.This base station can be Node B or eNB (evolution base station).
Adjusting module 402 is used for judging and receives success rate whether in default reception success rate tolerance interval, if, then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, the reception success rate is changed to receiving the success rate tolerance interval.Concrete, when receiving success rate greater than receiving going up in limited time of success rate tolerance interval, adjusting module 402 reduces PRACH channel expectation carrier/interface ratio according to default downward modulation step-length; Prescribe a time limit less than receiving the following of success rate tolerance interval when receiving success rate, adjusting module 402 improves PRACH channel expectation carrier/interface ratio according to default rise step-length.Adjusting module 402 also be used for to judge remain unchanged or adjust after PRACH channel expectation carrier/interface ratio whether in default channel expectation carrier/interface ratio tolerance interval, if, then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make PRACH channel expectation carrier/interface ratio after the adjustment in default channel expectation carrier/interface ratio tolerance interval.Concrete, to prescribe a time limit greater than going up of channel expectation carrier/interface ratio tolerance interval when PRACH channel expectation carrier/interface ratio, adjusting module 402 is adjusted to PRACH channel expectation carrier/interface ratio the upper limit of channel expectation carrier/interface ratio tolerance interval; When following the prescribing a time limit of PRACH channel expectation carrier/interface ratio less than channel expectation carrier/interface ratio tolerance interval, adjusting module 402 is adjusted to PRACH channel expectation carrier/interface ratio the lower limit of channel expectation carrier/interface ratio tolerance interval.
The embodiment of the invention is adjusted PRACH channel expectation carrier/interface ratio according to inserting success rate, realized the self adaptation adjustment of PRACH channel expectation carrier/interface ratio, made PRACH channel expectation carrier/interface ratio after the adjustment near the optimal value of PRACH channel expectation carrier/interface ratio under the current network environment.The embodiment of the invention is further adjusted PRACH channel expectation carrier/interface ratio by default channel expectation carrier/interface ratio tolerance interval, makes it better near optimal value, and optimal value refers to the only value under the current channel circumstance.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software embodiment or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form of the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make and carry out the sequence of operations step producing computer implemented processing at computer or other programmable devices, thereby be provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction that computer or other programmable devices are carried out.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. a method of adjusting channel expectation carrier/interface ratio is characterized in that, may further comprise the steps:
Obtain the reception success rate in the random access procedure;
Judge to receive success rate whether in default reception success rate tolerance interval, if, then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make to receive success rate and change to receiving the success rate tolerance interval;
Judge remain unchanged or adjust after PRACH channel expectation carrier/interface ratio whether in default channel expectation carrier/interface ratio tolerance interval, if, then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make PRACH channel expectation carrier/interface ratio after the adjustment in default channel expectation carrier/interface ratio tolerance interval.
2. the method for claim 1, it is characterized in that, the step that obtains the reception success rate in the random access procedure comprises: the inherent FPACH of measurement period goes up the number that sends message and the number of the feedback that receives at RACH or PRACH, according to feedback number and the ratio that sends number, obtain to receive success rate.
3. the method for claim 1, it is characterized in that, adjust PRACH channel expectation carrier/interface ratio, the reception success rate is comprised: when receiving success rate greater than reception success rate tolerance interval upward in limited time, reduce the PRACH channel according to the downward modulation step-length of presetting and expect carrier/interface ratio to the step that receives the variation of success rate tolerance interval; Prescribe a time limit less than receiving the following of success rate tolerance interval when receiving success rate, improve PRACH channel expectation carrier/interface ratio according to default rise step-length.
4. the method for claim 1, it is characterized in that, adjust PRACH channel expectation carrier/interface ratio, the step of PRACH channel expectation carrier/interface ratio in default channel expectation carrier/interface ratio tolerance interval after the adjustment comprised: when PRACH channel expectation carrier/interface ratio greater than channel expectation carrier/interface ratio tolerance interval in limited time, PRACH channel expectation carrier/interface ratio is adjusted to the upper limit that channel is expected the carrier/interface ratio tolerance interval; When following the prescribing a time limit of PRACH channel expectation carrier/interface ratio less than channel expectation carrier/interface ratio tolerance interval, PRACH channel expectation carrier/interface ratio is adjusted to the lower limit of channel expectation carrier/interface ratio tolerance interval.
5. a base station is characterized in that, comprising:
Acquisition module is for the reception success rate that obtains random access procedure;
Adjusting module, be used for to judge receive success rate whether in default reception success rate tolerance interval, if then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make to receive success rate to receiving the variation of success rate tolerance interval;
Wherein, described adjusting module also be used for to judge remain unchanged or adjust after PRACH channel expectation carrier/interface ratio whether in default channel expectation carrier/interface ratio tolerance interval, if, then keep PRACH channel expectation carrier/interface ratio constant, otherwise adjust PRACH channel expectation carrier/interface ratio, make PRACH channel expectation carrier/interface ratio after the adjustment in default channel expectation carrier/interface ratio tolerance interval.
6. base station as claimed in claim 5 is characterized in that, the inherent FPACH of acquisition module measurement period goes up the number that sends message and the number of the feedback that receives at RACH or PRACH, according to the feedback number and send the ratio of number, obtains to receive success rate.
7. base station as claimed in claim 5 is characterized in that, when receiving success rate greater than receiving going up in limited time of success rate tolerance interval, adjusting module reduces PRACH channel expectation carrier/interface ratio according to default downward modulation step-length; Prescribe a time limit less than receiving the following of success rate tolerance interval when receiving success rate, adjusting module improves PRACH channel expectation carrier/interface ratio according to default rise step-length.
8. base station as claimed in claim 5, it is characterized in that, prescribe a time limit greater than going up of channel expectation carrier/interface ratio tolerance interval when PRACH channel expectation carrier/interface ratio, adjusting module is adjusted to PRACH channel expectation carrier/interface ratio the upper limit of channel expectation carrier/interface ratio tolerance interval; When following the prescribing a time limit of PRACH channel expectation carrier/interface ratio less than channel expectation carrier/interface ratio tolerance interval, adjusting module is adjusted to PRACH channel expectation carrier/interface ratio the lower limit of channel expectation carrier/interface ratio tolerance interval.
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| EP0565507A2 (en) * | 1992-04-10 | 1993-10-13 | Ericsson Inc. | Power control for random access call set-up in a mobile telephone system |
| CN1123976A (en) * | 1994-10-24 | 1996-06-05 | Ntt移动通信网株式会社 | Transmission Power Control Scheme for Mobile Communication System |
| CN1350730A (en) * | 1999-03-15 | 2002-05-22 | 艾利森电话股份有限公司 | Adaptive power control in a radio communications system |
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| EP0565507A2 (en) * | 1992-04-10 | 1993-10-13 | Ericsson Inc. | Power control for random access call set-up in a mobile telephone system |
| CN1123976A (en) * | 1994-10-24 | 1996-06-05 | Ntt移动通信网株式会社 | Transmission Power Control Scheme for Mobile Communication System |
| CN1350730A (en) * | 1999-03-15 | 2002-05-22 | 艾利森电话股份有限公司 | Adaptive power control in a radio communications system |
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