CN1302683C - A method for preserving planned covering radius of cell - Google Patents
A method for preserving planned covering radius of cell Download PDFInfo
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- CN1302683C CN1302683C CNB200410071735XA CN200410071735A CN1302683C CN 1302683 C CN1302683 C CN 1302683C CN B200410071735X A CNB200410071735X A CN B200410071735XA CN 200410071735 A CN200410071735 A CN 200410071735A CN 1302683 C CN1302683 C CN 1302683C
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Abstract
The present invention relates to a method for maintaining a cell planning coverage radius, which comprises that: when the current load of a cell exceeds or is lower than a planned load, an RNC (radio network controller) transmits control signalling to UE (user equipment) and/or a CN (core network) so as to adjust the AMR speech encoding rate of the UE and/or the CN. The present invention adjusts the AMR speech encoding rate in real time on the basis of the current load condition of the cell, ensures the normal access and the normal call of a user, and maintains the cell planning coverage radius unchanged.
Description
Technical field
The present invention relates to wireless communication field, refer to a kind of method that under the situation that cell load changes, how to keep the plot planning covering radius especially.
Background technology
WCDMA is one of 3G (Third Generation) Moblie technology of 3GPP regulation, its wave point adopts the access way of code division multiple access, all users adopt identical upstream frequency, and identical downstream frequency is adopted in all sub-districts, distinguish different user and different districts by different code words.The signal that arbitrary user (or sub-district) sends all causes interference to other sub-districts (or user) that can receive this signal in the network, needs other users (or sub-district) to increase transmitting power to overcome this interference.Therefore say that the WCDMA system is a self-interference system.
These characteristics make that covering, capacity, the quality three of WCDMA network are closely bound up, and Interference Control is the key that influences this three:
When capacity increased, cell load increased, because the WCDMA system is an a kind of self-interference system, the capacity increase also just means the increase of interference; When disturbing increase, constant in order to guarantee the required signal interference ratio of the normal demodulation of receiving terminal received signal, transmitting terminal needs bigger signal transmission power to overcome the increase of interference; Because the maximum transmission power of single link is constant, if being used to overcome capacity, more power increases the interference that brings, and the power that can be used for overcoming path loss has just reduced, and the covering radius of sub-district also just reduces thereupon.Therefore when the capacity of sub-district increased, the covering radius of sub-district dwindled.
When covering increase, be used to overcome the corresponding increase of power of path loss; Because the maximum transmission power of single link is constant, the power that therefore can be used to overcome interference has just reduced; For the signal interference ratio of keeping the receiving terminal received signal is constant, the interference that receiving terminal can be tolerated is also corresponding to be reduced; The minimizing of interference margins also just means the less of sub-district permissible load, and cell capacity reduces.
In general, in the WCDMA network,, guarantee that professional BLER is constant, keep the stable of quality of service by inner loop power control and exterior ring power control.
What capacity reflected is the number of users that can insert in the sub-district, and the number of users that the sub-district is inserted is many more, and the load of sub-district is high more.To up link, cell load is by the total received signal power in broadband (RTWP, the Received Total Wideband Power) expression of sub-district; To down link, cell load can be weighed by the total transmitting power of cell downlink.
Because covering and capacity are closely bound up, the covering radius in the network planning all is the covering radius under a fixed load and the capacity conditions, and too much when the number of users that a certain sub-district is inserted, when cell load surpassed design (calculated) load, the covering radius of sub-district just can't guarantee.In this case, when the user makes a call and converses in cell edge or shadow region, possibly can't search network or call drop takes place.
The AMR speech coding is a kind of new source coding technique that the WCDMA system adopts.The AMR voice comprise from 12.2kbps to 4.75kbps the speech coding of 8 kinds of speed altogether, and the specification of 8 kinds of AMR speech codings sees the following form one.
Table one: various AMR coding middle grade A, B, the bit number of C
| Frame type | The AMR coding mode | Total bit number | Grade A | Grade B | Grade C |
| 0 | 4,75 | 95 | 42 | 53 | 0 |
| 1 | 5,15 | 103 | 49 | 54 | 0 |
| 2 | 5,90 | 118 | 55 | 63 | 0 |
| 3 | 6,70 | 134 | 58 | 76 | 0 |
| 4 | 7,40 | 148 | 61 | 87 | 0 |
| 5 | 7,95 | 159 | 75 | 84 | 0 |
| 6 | 10,2 | 204 | 65 | 99 | 40 |
| 7 | 12,2 | 244 | 81 | 103 | 60 |
The AMR voice of different rates have different performances: under identical mistake piece condition, source coding rate is high more, and voice quality is also just good more, and (because speed is high more, coded message is many more, such as: 12.2k＞4.75k); But speed is high more, reach identical Block Error Rate, and the transmitting power that needs is also just big more, and (because speed is high more, the chnnel coding gain is low more, such as: 3.84M/12.2K＜3.84M/4.75K).In the WCDMA network, specifically adopt the AMR voice of which kind of speed to converse, can select according to physical condition by RNC.
Along with increasing of number of users, cell load increases thereupon.When offered load surpassed design (calculated) load, the covering radius of planning just can't guarantee.In order to continue to satisfy the covering radius requirement of planning, common solution is the network capacity extension.The network capacity extension can comprise various ways, and comprising increases carrier frequency, increase new site etc.By increasing new carrier frequency or new website, the user in the sub-district is shared by other sub-districts, and cell load reduces, and coverage is improved; By increasing new website, the radius that former sub-district need cover reduces, and covers probability and is guaranteed.
Fig. 1 to Fig. 4 has reflected the thinking of this solution.
As shown in Figure 1, under planning load level, the user of some can be inserted in each sub-district, guarantees certain coverage.
When the user increased, sub-district actual loading level was higher than planning load level, and the actual coverage in sub-district is dwindled, and edge customer can't be connected and cause call drop, as shown in Figure 2.
Fig. 3 is a kind of settling mode when the user increases, by increasing carrier frequency, making the number of users of carrying on each sub-district compare with the every community user number in the planning remains unchanged, making actual loading level in sub-district compare with planning load level remains unchanged, make the actual coverage in sub-district remain unchanged, solve edge customer call drop problem.
Fig. 4 is the another kind of settling mode when the user increases, by increasing website, making the number of users of carrying on each sub-district compare with the every community user number in the planning remains unchanged, make actual loading level in sub-district compare and remain unchanged that the scope that makes the sub-district to cover remains unchanged with planning load level.And behind the increase website, the scope that every sub-district need cover reduces, and solves edge customer call drop problem.
Adopt above-mentioned network capacity extension method, can fundamentally solve and when offered load surpasses design (calculated) load, cover the problem that probability reduces, but adopt this method to have following defective:
1, problem solves untimely: the network capacity extension needs the regular hour, no matter be to increase carrier frequency or increase website, all need operator to buy new equipment, from project verification, bid, production, Installation and Debugging to coming into operation, need through certain handling procedure and link cost a period of time.Before dilatation was finished, the covering problem that causes because of load too high existed always, can't be resolved.
2, problem workout cost height: no matter be to increase carrier frequency or increase website, all need operator to buy new equipment, increased operating cost of operator.
3, problem solves dumb: because user behavior has certain randomness, which place make a phone call and make a call how long all be uncertain.The load too high of a certain sub-district cause covering problem may be only at a time the somewhere occur at random.If the network capacity extension then may cause waste of network resources in order to solve this problem that occurs once in a while; If ignore the problem that these occur once in a while, then can influence end user's satisfaction.
In the prior art, when offered load surpasses design (calculated) load, guarantee that the another kind of method of design covering probability is to control by the load admission technology.Fig. 5 is the flow chart that the load access is used to guarantee to cover probability.
Idiographic flow is as follows:
RNC periodically monitors each cell load situation, and preserves each sub-district present load situation result;
After receiving that new user inserts request, read the present load situation that inserts the sub-district; And, predict the cell load after new user inserts according to the business that the user asks;
If the cell load of prediction is greater than the cell load of planning, then refusing user's inserts this sub-district; If the cell load of prediction is lower than the cell load of planning, then allow the user to insert this sub-district.
Because under the cell load condition of planning, the sub-district covers can satisfy planning requirement.Therefore as long as sub-district prediction load is not higher than the plot planning load, just the sub-district covering problem can not appear.
Guarantee to cover probability by the load access, can guarantee the covering radius of sub-district, but adopt this method to have following defective:
1, influence user's call completing rate: when the load admission technology according to the planning cell load during as load-threshold, in case cell load is higher than the planning load-threshold, then all new users insert request and are rejected in this sub-district, till cell load is lower than the planning load-threshold.In the time of can increasing the user like this and insert by the network refusal insert may, reduce user's call completing rate.
2, there is waste in local resource: if do not adopt this technology, when cell load was higher than the planning load, influence was coverage radius of cell originally, at this time still can call out as usual at the near user in distance base station and make a phone call.After adopting this technology, in order to guarantee covering radius, if cell load is higher than the planning load, no matter then whether the user distance base station is far and near, the capital admission reject, and, can cause the idle waste of part local resource like this no matter whether remaining sub-district hardware and software resource really can not insert new user.
Summary of the invention
The invention provides a kind ofly, select AMR speech encoding rate in the sub-district to guarantee the method for the coverage radius of cell planned in real time according to sub-district present load situation.
The inventive method comprises:
The corresponding relation of default AMR speech encoding rate and cell load level;
The load state of each sub-district of radio network controller cycle detection; And search described corresponding relation according to sub-district present load situation, obtain expecting the AMR speech encoding rate of adjusting;
Radio network controller is adjusted to the AMR speech encoding rate of UE and/or core net by the control signaling AMR speech encoding rate of expection.
According to said method of the present invention, the default AMR speech encoding rate and the corresponding relation of ascending load of cell level are stored in the up mapping table;
The default AMR speech encoding rate and the corresponding relation of cell downlink load level are stored in the descending mapping table.
Said method according to the present invention also comprises the following steps:
The size of the AMR speech encoding rate of the AMR speech encoding rate adjusted of expection and current use relatively;
If, then reducing the AMR speech encoding rate less than the AMR speech encoding rate of current use, the AMR speech encoding rate that expection is adjusted adjusts speed to expection.
If, then increasing the AMR speech encoding rate greater than the AMR speech encoding rate of current use, the AMR speech encoding rate that expection is adjusted adjusts speed to expection.
According to said method of the present invention, reduce the AMR speech encoding rate and after speed is adjusted in expection, also output signal to a timer zero setting, and start this timer simultaneously;
When speed is adjusted in expection greater than the AMR speech encoding rate of current use, detect described timer and whether expire, if then increase the AMR speech encoding rate and adjust speed to expection; Otherwise, do not carry out the speed adjustment.
According to said method of the present invention, the AMR speech encoding rate of the storage in the described up mapping table and the corresponding relation of ascending load of cell level, its concrete method to set up is as follows:
Step 1: according to the uplink interference surplus of following formula (1) calculation plot planning load correspondence, with it as reference interference margins MIRef;
η wherein
ULBe the ascending load of cell factor, Noiserise is the interference margins that cell load is reserved;
Step 2: according to following formula (2), need the processing gain G of the speech business correspondence of all standing in the computing network planning, with it as reference gain G Ref;
Rate in the following formula is the speech encoding rate of planning;
Step 3: calculate the processing gain Gi of other AMR speech encoding rate according to formula (2), then other AMR speech coding need satisfy the interference margins of all standing requirement when constant and is: MIi=MIRef+ (Gi-GRef);
Step 4: according to the MIi that calculates, substitution formula (1) calculates this interference margins corresponding district ascending load.
According to said method of the present invention, the corresponding relation of the AMR speech encoding rate of the storage in the described descending mapping table and cell downlink load level, its concrete method to set up is as follows:
Step 1: according to the descending interference margins of following formula (3) calculation plot planning load correspondence, with it as reference interference margins MIRef;
MI wherein
DLBe descending interference margins, η
DLBe the down load factor, α (j) is the sub-district nonopiateization factor, and f (j) is the adjacent area interference factor, P
MaxBe sub-district maximum transmission power, N
0Be noise level, CL
0Be path coupling loss;
Step 2: according to following formula (2), need the processing gain G of the speech business correspondence of all standing in the computing network planning, with it as reference gain G Ref;
Rate in the following formula is the speech encoding rate of planning;
Step 3: calculate the processing gain Gi of other AMR speech encoding rate according to formula (2), then need to satisfy the interference margins of all standing requirement when constant be MIi=MIRef+ (Gi-GRef) to other AMR speech coding;
Step 4: according to the MIi that calculates, substitution formula (3) calculates this interference margins corresponding district down load.
Described go up AMR speech encoding rate in the descending mapping table be eight kinds of speech encoding rates of AMR.
Described go up AMR speech encoding rate in the descending mapping table choose in eight kinds of speech encoding rates of AMR some kinds according to the equidistant principle of corresponding load level.
The sense cycle that load state adopted of each sub-district of described radio network controller cycle detection is ten second-times; The timing of described timer is a minute magnitude.
Described ascending load situation is weighed by the total received signal power RTWP in broadband, sub-district; Described down load situation is weighed by cell transmit power.
The control signaling that described radio network controller sends to core net is a rate control signaling; The control signaling of sending to subscriber equipment is that transformat jointly controls signaling.
The present invention adjusts the AMR speech encoding rate in real time according to sub-district present load situation, guarantees user's normal access, keeps coverage radius of cell constant.
Description of drawings
Fig. 1 covers schematic diagram for the sub-district under the planning loading condition.
Sub-district when too much covers schematic diagram to Fig. 2 for the user inserts.
When increasing for the user, adopt Fig. 3 the mode that increases carrier frequency to solve the schematic diagram of covering.
When increasing for the user, adopt Fig. 4 the mode that increases website to solve the schematic diagram of covering.
Fig. 5 guarantees to cover the flow chart of probability for available technology adopting load access mode.
Fig. 6 is up AMR speech encoding rate control signalling diagram.
Fig. 7 is descending AMR speech encoding rate control signalling diagram.
Fig. 8 adjusts flow chart for AMR speech encoding rate of the present invention with loading condition.
Embodiment
One, principle explanation
The factor that influences coverage radius of cell comprises many aspects, in table 8.3 illustrated of list of references " WCDMA for UMTS, Harri Holma and Antti Toskala, 2000 " influence the factor that 12.2k AMR voice cover, see the following form two.
Table two: AMR 12.2kbps speech business link budget reference
In the table two, interference margins (parameter I) is expressed as the interference margins that cell load is reserved, the ascending load of cell of interference margins 3dB correspondence 50%, because:
η wherein
ULBe ascending load of cell, Noiserise is the noise rise that cell load causes, and is the interference margins that cell load is reserved, and works as η
UL, utilize formula 1, Noiserise=3dB at=50% o'clock.
In the table two, the processing gain of processing gain (parameter 1) expression 12.2k AMR voice, processing gain is:
When speed Rate=12.2k, utilize formula 2, processing gain G=25.0dB.
Table two explanation, under 50% ascending load of cell condition, to the AMR voice user of 12.2kbps, its sub-district covers and allows path loss is 141.9dB.
Adopt the computational methods of table two, other conditions are constant, and when cell load increased to 75%, according to formula 1, interference margins was 6dB, and interference margins has increased 3dB when comparing 50% load.If still adopting the AMR speech encoding rate of 12.2kbps converses, then sub-district covering permission path loss is 141.9-(6-3)=138.9dB, allow path loss to reduce 3dB when comparing 50% load, coverage radius of cell dwindles (it is relevant with propagation model specifically to dwindle how many rice, does not discuss at this).
Under 75% loading condition, converse if use the AMR speech encoding rate of 5.9kbps instead, according to formula 2, the processing gain of 5.9kbps is
Then cover to allow path loss be 141.9-(6-3)+(28.1-25.0)=142.0dB in the sub-district, consistent with the path loss of 12.2kbpsAMR voice under 50% loading condition, the covering radius unanimity.
For session service, the user at first needs is that (no matter center of housing estate or cell edge) can both converse in any place, can both make a call.It is not strong especially that the speech coding of which kind of speed of concrete employing is carried out the conversation demand.Therefore plan thresholding when cell load surpasses, when coverage radius of cell shrinks, adopt the low rate speech coding to increase the interference increase influence that causes to offset load, the covering radius of planning is provided, this technology is feasible.
The maximum ascending load that can support for the AMR voice of different rates can calculate as follows:
According to formula 2, the processing gain of speech business correspondence that needs all standing in the computing network planning is as reference gain G Ref (requiring all standing of 12.2k AMR voice usually); According to formula 1, the interference margins that calculates planning cell load correspondence is as reference interference margins MIRef.
Calculate the processing gain Gi of other AMR voice rates coding according to formula 2, then need to satisfy the interference margins of all standing requirement when constant be MIi=MIRef+ (Gi-GRef) to other AMR voice rate coding.
According to MIi, calculate the load factor of this interference margins correspondence by formula 1.
If the demand during supposition planning is 12.2kbps AMR voice all standing under 50% ascending load, by calculation procedure noted earlier, the ascending load that other AMR speech encoding rate can satisfy all standing requirement sees the following form three.
Table three: different AMR speech codings satisfy the ascending load mapping table of all standing requirement
| AMR speech encoding rate (kbps) | Processing gain (dB) | Corresponding maximum ascending load (%) | Interference margins (dB) |
| 4.75 | 29.1 | 80.53 | 7.1 |
| 5.15 | 28.7 | 78.89 | 6.8 |
| 5.90 | 28.1 | 75.82 | 6.2 |
| 6.70 | 27.6 | 72.54 | 5.6 |
| 7.40 | 27.2 | 69.67 | 5.2 |
| 7.95 | 26.8 | 67.42 | 4.9 |
| 10.2 | 25.8 | 58.20 | 3.8 |
| 12.2 | 25.0 | 50.00 | 3.0 |
Descending calculation procedure and up similar, just computing formula and the up used formula 1 between down load and interference margins had any different.
MI wherein
DLBe descending interference margins, η
DLBe the down load factor.Other parameters comprise: α (j) is the sub-district nonopiateization factor, and f (j) is the adjacent area interference factor, P
MaxBe sub-district maximum transmission power, N
0Be noise level, CL
0Be path coupling loss.
Provided the method for adjustment of AMR voice rate in the 3GPP agreement, to up link, change the ascending voice code rate by signaling Transport Format Combination Control control UE (subscriber equipment), as shown in Figure 6, the visible list of references 3GPP of concrete grammar TS25.331,2001.6; To down link, change the downlink voice code rate by Rate Control frame control CN (core net), as shown in Figure 7, the visible list of references 3GPP of concrete grammar TS25.415,2001.6.
Two, specific implementation method of the present invention
AMR voice rate of the present invention is adjusted flow process as shown in Figure 8, comprises the following steps:
1, the current up-downgoing load state in each sub-district of RNC cycle detection, ascending load is weighed by sub-district RTWP, and down load is weighed by cell transmit power;
2, search cell load and AMR speech encoding rate mapping form, find the AMR voice rate that needs to satisfy all standing requirement needs under the present load condition;
3, will expect that voice rate and the present rate adjusted compare, and operate respectively according to comparative result:
The speed ratio present rate of adjusting when expection hour illustrates that the present load situation in order to guarantee covering radius, need be turned down current AMR speech encoding rate than higher in the sub-district.RNC sends out message informing UE or CN, and the speed of all users in the sub-district is reduced to expection speed.With " sub-district speed reduces the protection timer " zero setting, and restart timer.
When expecting that the speed ratio present rate of adjusting is big, illustrate that the present load situation is lower in the sub-district, covering radius is out of question, and can heighten current AMR speech encoding rate.At first check " sub-district speed reduces the protection timer ",, then do not do any operation if timer is still not yet due; If timer expires, send out message informing UE or CN, the speed of all users in the sub-district is elevated to expection speed.
When expecting that the speed of adjusting is consistent with present rate, illustrate that the present load situation does not change in the sub-district, coverage condition is not deterioration also, still can guarantee all standing, and the AMR speech encoding rate remains unchanged, and RNC need not anyly operate.
Adopting " sub-district speed reduces the protection timer " among the present invention, is for fear of the frequent table tennis adjustment between high low rate.Because rate variation can produce certain influence to cell load, when voice rate increased, transmitting power increased, and cell load increases; When voice rate reduced, transmitting power reduced, and cell load reduces.If when cell load was in the critical point left and right sides of a certain speed adjustment thresholding, rate variation may produce table tennis adjustment.That is: cell load increase-＞speed reduces-＞transmitting power reduces-＞cell load reduces-＞speed increases-＞transmitting power increases-＞cell load increases-＞....Specific speed is raise and reduces operation, and it is in order to guarantee that the sub-district covers that speed reduces, and it is for better voice service is provided that speed raises, and collateral security network coverage quality considers, speed reduces specific speed and raises and have higher priority.Therefore adopt " sub-district speed reduces the protection timer " to avoid table tennis adjustment: after speed reduces, start timer, at this moment between in, forbid that speed increases operation.Because cell load may continue to raise,, in start-up time, still allow speed to reduce operation at timer for guaranteeing coverage radius of cell in this case.
In the inventive method, cell load and AMR speech coding mapping form generate according to step and formula in the above-mentioned principle explanation according to planning service rate in the physical planning and planning cell load.Because load definition, the interference margins computing formula of up link and down link are all inequality, therefore up mapping form and descending mapping form are independently of one another.To up mapping table, suppose under up planning 50% loading condition (the up planning load of disparity items may be different), shown in formula 1 and formula 2, the following table four of mapping form:
Table four: cell load and AMR speech coding mapping table (up)
| The ascending load level | The AMR speech encoding rate |
| η UL＜＝50％ | 12.2kbps |
| 50％＜η UL＜＝58％ | 10.2kbps |
| 58％＜η UL＜＝67％ | 7.95kbps |
| 67％＜η UL＜＝69％ | 7.40kbps |
| 69％＜η UL＜＝72％ | 6.70kbps |
| 72％＜η UL＜＝75％ | 5.90kbps |
| 75％＜η UL＜＝78％ | 5.15kbps |
| η UL＞78％ | 4.75kbps |
To descending mapping table, suppose (the descending planning load of disparity items may be different) under descending planning 50% loading condition, according to formula 3 and formula 2, shown in the following table five of mapping form:
Table five: cell load and AMR speech coding mapping table (descending)
| The down load level | The AMR speech encoding rate |
| η DL＜＝50％ | 12.2kbps |
| 50％＜η DL＜＝61％ | 10.2kbps |
| 61％＜η DL＜＝82％ | 7.95kbps |
| 82％＜η DL＜＝89％ | 7.40kbps |
| 89％＜η DL＜＝99％ | 6.70kbps |
| 99％＜η DL＜＝100％ | 5.90kbps |
| - | 5.15kbps |
| - | 4.75kbps |
Other parameter of choosing in the formula 3 during computational chart five is: α (j)=0.59, f (j)=1.78, P
Max=43dBm, N
0=-108+NF=-108+7=-101dBm, CL
0=137.98dB (above parameter is the dense city environment, the CS64K all standing, no tower is put the link estimation parameter under the condition)
Can see that by above table four, table five part A MR speech encoding rate is approaching, it is meticulous to divide the grade of load according to 8 kinds of AMR voice rates, can cause too much speed to adjust signaling like this, and single is adjusted DeGrain.Therefore can select 8 kinds of AMR speech encoding rates, only select the AMR speech coding of part speed.System of selection is that the corresponding load level of requirement equidistantly distributes, and selects 4 kinds of AMR speech codings.The mapping table of his-and-hers watches four is selected, its result as shown in Table 6, the mapping table of his-and-hers watches five is selected, its result as shown in Table 7:
Table six: cell load and AMR speech coding mapping table (simplifying version, up)
| The ascending load level | The AMR speech encoding rate |
| η UL＜＝50％ | 12.2kbps |
| 50％＜η UL＜＝64％ | 7.95kbps |
| 64％＜η UL＜＝78％ | 5.90kbps |
| η UL＞78％ | 4.75kbps |
Table seven: cell load and AMR speech coding mapping table (simplifying version, descending)
| The ascending load level | The AMR speech encoding rate |
| η DL＜＝50％ | 12.2kbps |
| 50％＜η DL＜＝70％ | 7.95kbps |
| 70％＜η DL＜＝90％ | 6.70kbps |
| η DL＞90％ | 5.90kbps |
For avoiding signaling too much, the sense cycle of AMR speed adjustment is orientated as ten second-times, as 20 seconds; The protection timer is orientated as a minute magnitude, as 2 minutes.
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 claims.
Claims (12)
1, a kind of method that keeps the plot planning covering radius is characterized in that comprising:
The corresponding relation of default AMR speech encoding rate and cell load level;
The load state of each sub-district of radio network controller cycle detection; And search described corresponding relation according to sub-district present load situation, obtain expecting the AMR speech encoding rate of adjusting;
Radio network controller is adjusted to the AMR speech encoding rate of subscriber equipment and/or core net by the control signaling AMR speech encoding rate of expection.
2, the method for claim 1 is characterized in that, the default AMR speech encoding rate and the corresponding relation of ascending load of cell level are stored in the up mapping table;
The default AMR speech encoding rate and the corresponding relation of cell downlink load level are stored in the descending mapping table.
3, the method for claim 1 is characterized in that also comprising the following steps:
The size of the AMR speech encoding rate of the AMR speech encoding rate adjusted of expection and current use relatively;
If, then reducing the AMR speech encoding rate less than the AMR speech encoding rate of current use, the AMR speech encoding rate that expection is adjusted adjusts speed to expection.
4, the method for claim 1 is characterized in that, adjusts speed if the AMR speech encoding rate that expection is adjusted, then increases the AMR speech encoding rate greater than the AMR speech encoding rate of current use to expection.
5, method as claimed in claim 3 is characterized in that, reduces the AMR speech encoding rate and also output signal to a timer zero setting after speed is adjusted in expection, and start this timer simultaneously;
When speed is adjusted in expection greater than the AMR speech encoding rate of current use, detect described timer and whether expire, if then increase the AMR speech encoding rate and adjust speed to expection; Otherwise, do not carry out the speed adjustment.
6, method as claimed in claim 2 is characterized in that: the AMR speech encoding rate of the storage in the described up mapping table and the corresponding relation of ascending load of cell level, and its concrete method to set up is as follows:
Step 1: according to the uplink interference surplus of following formula (1) calculation plot planning load correspondence, with it as reference interference margins MIRef;
η wherein
ULBe the ascending load of cell factor, Noiserise is the interference margins that cell load is reserved;
Step 2: according to following formula (2), need the processing gain G of the speech business correspondence of all standing in the computing network planning, with it as reference gain G Ref;
G=10*lg (3.84M/Rate) formula (2)
Rate in the following formula is the speech encoding rate of planning;
Step 3: calculate the processing gain Gi of other AMR speech encoding rate according to formula (2), then need to satisfy the interference margins of all standing requirement when constant be MIi=MIRef+ (Gi-GRef) to other AMR speech coding;
Step 4: according to the MIi that calculates, substitution formula (1) calculates this interference margins corresponding district ascending load.
7, method as claimed in claim 2 is characterized in that: the corresponding relation of the AMR speech encoding rate of the storage in the described descending mapping table and cell downlink load level, and its concrete method to set up is as follows:
Step 1: according to the descending interference margins of following formula (3) calculation plot planning load correspondence, with it as reference interference margins MIRef;
MI wherein
DLBe descending interference margins, η
DLBe the down load factor, α (j) is the sub-district nonopiateization factor, and f (j) is the adjacent area interference factor, P
MaxBe sub-district maximum transmission power, N
0Be noise level, CL
0Be path coupling loss;
Step 2: according to following formula (2), need the processing gain G of the speech business correspondence of all standing in the computing network planning, with it as reference gain G Ref;
G=10*lg (3.84M/Rate) formula (2)
Rate in the following formula is the speech encoding rate of planning;
Step 3: calculate the processing gain Gi of other AMR speech encoding rate according to formula (2), then need to satisfy the interference margins of all standing requirement when constant be MIi=MIRef+ (Gi-GRef) to other AMR speech coding;
Step 4: according to the MIi that calculates, substitution formula (3) calculates this interference margins corresponding district down load.
8, as claim 6 or 7 described methods, it is characterized in that: described go up AMR speech encoding rate in the descending mapping table be eight kinds of speech encoding rates of AMR.
9, method as claimed in claim 8 is characterized in that: described go up AMR speech encoding rate in the descending mapping table choose in eight kinds of speech encoding rates of AMR some kinds according to the equidistant principle of corresponding load level.
10, method as claimed in claim 5 is characterized in that: the sense cycle that load state adopted of each sub-district of described radio network controller cycle detection is ten second-times; The timing of described timer is a minute magnitude.
11, method as claimed in claim 2 is characterized in that: described ascending load situation is weighed by the total received signal power RTWP in broadband, sub-district; Described down load situation is weighed by cell transmit power.
12, the method for claim 1 is characterized in that: the control signaling that described radio network controller sends to core net is a rate control signaling; The control signaling of sending to subscriber equipment is that transformat jointly controls signaling.
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| CN100461905C (en) * | 2006-03-28 | 2009-02-11 | 华为技术有限公司 | Method for regulating voice speed of radio base station cell |
| CN101212459B (en) * | 2006-12-28 | 2012-08-08 | 华为技术有限公司 | Method, system, and device for controlling media code rate |
| CN101729196B (en) * | 2008-10-20 | 2013-04-17 | 上海华为技术有限公司 | Self-adapting method, device and system for adjusting speech encoding rate |
| CN101868034B (en) * | 2009-04-15 | 2015-07-22 | 中兴通讯股份有限公司 | Method for establishing and removing local switch |
| CN108028723B (en) * | 2016-09-07 | 2021-03-16 | 深圳前海达闼云端智能科技有限公司 | VoLTE communication voice coding adjustment method and service base station |
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| CN1360805A (en) * | 1999-07-05 | 2002-07-24 | 诺基亚公司 | Method for coding mode selection |
| CN1483257A (en) * | 2000-01-10 | 2004-03-17 | �����ɷ� | Method and device for supporting adaptive multi rate (AMR) data in cdma communication system |
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