CN100407853C - Multi-carrier frequency cell major and minor carrier frequency adjusting method in TD-SCDMA system - Google Patents
Multi-carrier frequency cell major and minor carrier frequency adjusting method in TD-SCDMA system Download PDFInfo
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- CN100407853C CN100407853C CN2004100416988A CN200410041698A CN100407853C CN 100407853 C CN100407853 C CN 100407853C CN 2004100416988 A CN2004100416988 A CN 2004100416988A CN 200410041698 A CN200410041698 A CN 200410041698A CN 100407853 C CN100407853 C CN 100407853C
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Abstract
The present invention relates to a method for regulating the main and the auxiliary carrier frequency a multiple-carrier frequency cell in a TD-SCDMA system. In the multiple-carrier frequency cell, one carrier frequency is selected to be used as main carrier frequency, and other carrier frequency is used as auxiliary carrier frequency. A cell is established; the TSO and the DwPTS time slots of the main carrier frequency are activated; the TSO and the DwPTS time slots of the auxiliary carrier frequency are shielded; a main public channel is configured onto the main carrier frequency. P-CCPCH on the main carrier frequency adopts an omnidirectional coverage mode; all UEs receive broadcasting information on the main carrier frequency; the power, the disturbance and the load of the main and the auxiliary carrier frequency are measured; according to measuring results, the employable resource amount of the main and the auxiliary carrier frequency is evaluated; when the employable resource amount of the auxiliary carrier frequency is superior to the employable resource amount of the main and the auxiliary carrier frequency, the main and the auxiliary carrier frequency are switched over. By the method of the present invention, both the main carrier frequency and the auxiliary carrier frequency can admit users with small collision probability and high successful possibility of admission.
Description
Technical field:
The present invention relates in the multi-carrier frequency cell in TD_SCDMA (the Time Division-Synchronous Code DivisionMultiple Access time-division one, the synchronous code division multiple access inserted) system adjustment of major-minor carrier frequency.
Background technology:
In order to satisfy the continuous growth of the traffic in the sub-district, need in a sub-district, use a plurality of carrier frequency usually.If but the sub-district is configured according to current TD-SCDMA agreement, use several carrier frequency that have DwPTS and TS0 in the sub-district, a UE (User Equipment, user) who is in the sub-district intersection can be faced with the Cell searching difficulty, measure problems such as complexity and switching difficulty so.
The overloading of TD alliance is advised in (hereinafter to be referred as " suggestion ") frequently, to each sub-district, determines one as main carrier frequency from the several frequencies that are assigned to, and remaining frequency is as assistant carrier frequency.Main carrier frequency uses identical scrambler and basic midamble (intermediate code) with assistant carrier frequency.In order to solve problems such as Cell searching difficulty and switching difficulty, in same cell range, only on main carrier frequency, send DwPTS and TS0, the frequency of its major-minor carrier frequency is fixed, so just need in system broadcast information SIB11, SIB12, increase relevant assistant carrier frequency information, the frequency information of relevant assistant carrier frequency is provided in corresponding specific information (as measuring control messages).
Because the user in all sub-districts admits on main carrier frequency, be assigned to then on each carrier frequency, so, admit the probability height of collision.What switch to simultaneously that the user of this sub-district measures is the information of main carrier frequency, but may finally be distributed on the assistant carrier frequency, thus the handoff procedure more complicated, and the probability of handover success is not high.
Summary of the invention:
Technical problem to be solved by this invention is to provide a kind of under the cell multi-carrier frequency replace mode, the method that major-minor carrier frequency is dynamically adjusted.At the resource used of major-minor carrier frequency how much come major-minor carrier frequency is dynamically adjusted.
Technical scheme of the present invention is:
1.1 in multi-carrier frequency cell, select a carrier frequency as main carrier frequency, other carrier frequency are as assistant carrier frequency; Main carrier frequency uses identical scrambler and basic midamble code (Midamble) with assistant carrier frequency; Wherein, the selection of main carrier frequency is at random, also can be the backstage configuration;
1.2 set up the sub-district, activate the TS0 and the DwPTS time slot of main carrier frequency, at the TS0 and the DwPTS time slot transmission signal of main carrier frequency; The TS0 and the DwPTS time slot of shielding assistant carrier frequency, the TS0 of assistant carrier frequency and DwPTS do not send signal, and the Your Majesty is total to channel configuration to main carrier frequency; Do not have P-CCPCH on the assistant carrier frequency, the P-CCPCH on the main carrier frequency adopts omnidirectional's coverage mode, and all UE receive the broadcast on the main carrier frequency;
1.3 power, interference and load to major-minor carrier frequency are measured, according to the stock number used of the major-minor carrier frequency of measuring of outcome evaluation; The power of carrier frequency is high more, interference is high more, load is heavy more, and it can use resource many more; Otherwise this carrier frequency can use resource few more; Can use the evaluation of stock number can make the weighted value of these several measuring amount; A lag time can be set, just power, interference and load to major-minor carrier frequency be measured once, according to the stock number used of the major-minor carrier frequency of measuring of outcome evaluation every a lag time.
1.4 if the assistant carrier frequency that does not have to use stock number to be better than main carrier frequency exists, forward step 1.3 to; Otherwise broadcast the message that major-minor carrier frequency will be reshuffled, make all UE all on new main carrier frequency, receive broadcast, and forward step 1.5 to.
Switch 1.5 initiate major-minor carrier frequency, current use main carrier frequency is switched to assistant carrier frequency, delete its common signal channel,, on new main carrier frequency, set up common signal channel, change step 1.2 using the maximum assistant carrier frequency of stock number to switch to main carrier frequency.
In the present invention, judging that the stock number used of assistant carrier frequency is better than the stock number used of main carrier frequency, is with one of condition:
(1) Q
Main_frequence＜Q
WorstAnd Q
Sub_frequency＞Q
Threshold
(2): Q
Sub_frequence＞Q
BestAnd Q
Main_frequency＜Q
Threshold
(3)：Q
main_frequence＜Q
sub_frequency-Q
hysteresis
Wherein:
Q
Main_frequenceBe to use resource on the main carrier frequency;
Q
Sub_frequenceBe to use resource on the assistant carrier frequency;
Q
WorstBe to use resource to be lower than the thresholding of worst-case value on the main carrier frequency;
Q
BestBe to use resource to be higher than the thresholding of best values on the assistant carrier frequency;
Q
ThresholdIt is a thresholding that can use resource on the major-minor carrier frequency;
Q
HysteresisResource sluggish parameter on the major-minor carrier frequency.
Use method of the present invention, can bring following effect:
(1) major-minor carrier frequency can be admitted, and can carry out at several frequencies so admit, and the method collision probability that proposes than " suggestion " is little.
What (2) switch that the user come and Xin start user measure is the information of main carrier frequency, also admits the method admittance probability of successful height that proposes than " suggestion " simultaneously on main carrier frequency.
(3) carry out acceptance judging on main carrier frequency, Resources allocation on assistant carrier frequency needs one with the handoff procedure on UE is from the main carrier frequency to the assistant carrier frequency.
(4) owing to the user who newly enters the sub-district always admits on main carrier frequency,, can on former carrier frequency, admit,, alleviate the burden of UE owing to do not need to carry out the sub-district gravity treatment if the user who has resided on the former carrier frequency is synchronous with former carrier frequency.
Description of drawings:
Fig. 1: after the sub-district is set up, initial major-minor carrier frequency distribution figure;
Fig. 2: after major-minor carrier frequency switches, the distribution diagram of major-minor carrier frequency;
Fig. 3: the key step flow chart that major-minor carrier frequency is dynamically adjusted among the present invention;
Fig. 4: during time T 1, the user profile of each carrier frequency;
Fig. 5: during time T 2, the user profile of each carrier frequency before switching;
Fig. 6: during time T 3, switch the user profile of each carrier frequency of back;
Fig. 7: the detail flowchart that the major-minor carrier frequency of the present invention is dynamically adjusted.
Embodiment:
In multi-carrier frequency cell, the a plurality of carrier frequency of cell configuration (being generally) with the carrier frequency that covers, all carrier frequency constitute set of carrier frequencies G (F0, F1 ... Fn), major-minor carrier frequency can be admitted new business, but the new customer service in the current area (user that refer to newly to start shooting user or switching enter this sub-district) can only be linked on the main carrier frequency.The main difference of main carrier frequency and assistant carrier frequency is: main carrier frequency TS0 (time slot 0) and DwPTS (descending pilot frequency time slot) time slot work, and assistant carrier frequency TS0 and DwPTS time slot are closed.UE reads broadcast and beep-page message on new main carrier frequency.That is to say, at the TS0 and the DwPTS time slot transmission signal of main carrier frequency.The TS0 of assistant carrier frequency and DwPTS do not send signal, and the Your Majesty is total to channel configuration to main carrier frequency.Do not have P-CCPCH on the assistant carrier frequency, the P-CCPCH on the main carrier frequency adopts omnidirectional's coverage mode, and all UE receive the broadcast on the main carrier frequency.
The initial cell search procedure of UE can be divided into following four steps: 1, search for the best sub-district of signal on certain carrier frequency; 2, detect the DwPTS of this sub-district, set up down-going synchronous; 3, obtain cell scrambling and basic Midamble sign indicating number (intermediate code); 4, determine the position of P-CCPCH (Primary Common Control Physical Channel), it is synchronous to obtain the control multi-frame, reads BCH (broadcast channel) information.From said process as can be known, owing to have only the DwPTS on the main carrier frequency to work, the DwPTS time slot on the assistant carrier frequency is closed, and users of all starts just or the user who switches in this cell range detect less than assistant carrier frequency information, can only be linked into main carrier frequency.User on assistant carrier frequency need carry out cell search process again because any reason loses down-going synchronous, finally also can only be linked on the main carrier frequency.
Basic ideas of the present invention are, main carrier frequency and assistant carrier frequency are fixing, and along with the release that is connected on establishment of connection new on the main carrier frequency and the assistant carrier frequency, the resource used on the major-minor carrier frequency can change.Information such as the power of RNC (radio network controller) by the major-minor carrier frequency of comprehensive assessment, interference, load are assessed the quality of all carrier frequency, and the power of carrier frequency is high more, it is high more to disturb, load is heavy more, and it can use resource many more; Otherwise this carrier frequency can use resource few more.Can use the evaluation of stock number can make the weighted value of these several measuring amount; If exist the resource used of certain assistant carrier frequency to be better than current main carrier frequency, then the main carrier frequency of current use is switched to assistant carrier frequency, using the maximum assistant carrier frequency of resource to switch to main carrier frequency.When main carrier frequency will change, for the customer service that is received on this carrier frequency, do not need to notify the user to switch, only need tell its main carrier frequency to change.
Fig. 3 has described key step of the present invention, and Fig. 7 then describes detailed process of the present invention in detail.Be described below:
As the step 1 of Fig. 3, CRNC (controlling radio network controller, the radio network controller of control) discerns the sub-district by C-ID (cell ID), the resource of using Node B to provide by home cell ID.Node B comes allocating cell according to the message that receives from CRNC.For the configuration of major-minor carrier frequency in the sub-district, can be that the database by the backstage disposes, if not configuration of background data base so just selects a frequency as main carrier frequency at random, other all frequencies are as assistant carrier frequency.Flow process corresponding to foundation of Fig. 7 sub-district and forward part.As shown in Figure 1 and Figure 4, sub-district C has four carrier frequency: f1, f2, f3 and f4.Selecting carrier frequency f1 is main carrier frequency, and other three carrier frequency f2, f3 and f4 are assistant carrier frequency.
According to the step 2 of Fig. 3, only on main carrier frequency, send broadcast and down-going synchronous message, the TS0 of assistant carrier frequency and DwPTS time slot are closed.Corresponding to " open main carrier frequency TS0 and DwPTS, close the TS0 and the DwPTS of assistant carrier frequency, on main carrier frequency, send broadcast and descending synchronous code " among Fig. 7.Like this, though there are a plurality of frequencies to use in the sub-district, DwPTS has only main carrier frequency that information is arranged constantly.Owing to can only detect the DwPTS information of main carrier frequency, so these UE can only be linked on the main carrier frequency when carrying out Cell searching for the user of new start and the user that switches to this sub-district.
According to the metrical information of power, interference and the load of major-minor carrier frequency, the resource used of major-minor carrier frequency is carried out comprehensive assessment, as the step 3 of Fig. 3 and the corresponding steps among Fig. 7.Obtain the information of current each frequency occupation condition.Can use the assessment of resource situation to assess based on power, interference and load, be the weighting of these several measuring amount.Can use stock number Q to calculate with the weighted Q=1-(F1+F2+F3+Fn) of measuring amount.Wherein: F1 is the function of power, increases with the increase of power; F2 is the function that disturbs, and increases with the enhancing of disturbing; F3 be the load function, F3 be the load increase and increase; Fn is the factor that other factors is taken all factors into consideration, as the number of users on the carrier frequency, traffic carrying capacity, successfully admit number of times, number of dropped calls etc.The definition of function F 1, F2, F3 and Fn and concrete implementation procedure, algorithm are relevant, and how this patent considers these factors relevant with the carrier frequency quality if only having characterized.From calculation expression as can be seen, big more or disturb strong more or load heavy more the time when power, can use stock number just few more.
After a lag time Thysteresis, if the inequality 1,2 or 3 of the resource used on the major-minor carrier frequency below satisfying switches to the frequency of main carrier frequency on the suitable assistant carrier frequency frequency.It is in order to prevent that major-minor carrier frequency from frequently switching that a lag time is set here.
If, so just major-minor carrier frequency is switched to using the quantity of resource to satisfy following equation on main carrier frequency and an assistant carrier frequency:
Inequality 1:Q
Main_frequence＜Q
WorstAnd Q
Sub_frequency＞Q
Threshold
Inequality 2:Q
Sub_frequence＞Q
BestAnd Q
Main_frequency＜Q
Threshold
Inequality 3:Q
Main_frequence＜Q
Sub_frequency-Q
Hysteresis
Wherein, each parameter is defined as follows:
Q
Main_frequenceBe to use resource on the main carrier frequency;
Q
Sub_frequenceBe to use resource on the assistant carrier frequency;
Q
WorstBe to use resource to be lower than the thresholding of worst-case value on the main carrier frequency;
Q
BestBe to use resource to be higher than the thresholding of best values on the assistant carrier frequency;
Q
ThresholdIt is a thresholding that can use resource on the major-minor carrier frequency;
Q
HysteresisResource sluggish parameter on the major-minor carrier frequency.
According to the judgment criterion of switching frequency, if current condition does not satisfy the requirement of switching frequency, main carrier frequency still rests on current this frequency so.Otherwise the dominant frequency point is switched on the best auxilliary frequency of condition.Set up the user of down-going synchronous with assistant carrier frequency, if can keep synchronous, then need not switch on the main carrier frequency, because make a call or during, can on current resident carrier frequency, initiate RRC establishment of connection process and distribute private resource by system's paging as UE.Through after a while, the condition of assistant carrier frequency f4 is better than main carrier frequency f1 (f4 also is that condition is best among carrier frequency f2, f3 and the f4 simultaneously), at this moment, broadcast the message that major-minor carrier frequency will be reshuffled, as the step 4 of Fig. 3 and the corresponding steps among Fig. 7, make UE after specific SFN or specific time, receiving broadcasting information on new main carrier frequency (for UE can both be received, broadcasting may need to continue for some time).
Last step according to Fig. 3 step 5 and Fig. 7 switches to f4 to the main carrier frequency of sub-district from f1, and f1 switches to assistant carrier frequency carrier frequency.The concrete process of switching is: as shown in Figure 4, before the switching, user Ui, 1, Ui, 2 are arranged on the carrier frequency fi ... Ui, ml, because carrier frequency f1 is a main carrier frequency, through after a while, as shown in Figure 5, carrier frequency f1 is resident again to advance some new user V1, V2 with switching ... Vm.When in all carrier frequency, when the condition of f4 becomes preferably, carry out the switching of major-minor carrier frequency, the main carrier frequency f1 of current use switches to assistant carrier frequency, and assistant carrier frequency f4 switches to main carrier frequency; After the switching, the user U1 of f1 on the carrier frequency, 1, U1,2 ... U1, m1 and V1, V2 ... Vm continues to reside in carrier frequency f1; The last resident user of f2, f3 and f4 remains unchanged on the carrier frequency, and the user on the carrier frequency f4 is imperceptible to switch to main carrier frequency from assistant carrier frequency.Through after a while, as shown in Figure 6, resident again and switch some new user W1, W2 on the main carrier frequency f4 ... Wn.As time goes on, main carrier frequency may switch to other carrier frequency from carrier frequency f4 again.In this process, suppose not have the user to shut down and switch this sub-district, otherwise the resident user of each carrier frequency can reduce gradually.
The inventive method only sends DwPTS and broadcast message (TS0) on main carrier frequency, a plurality of frequencies use a common broadcast channel, and the Common Control Channel DwPCH of same sub-district, P-CCPCH, PICH etc. only are configured on the main carrier frequency.The configuration of major-minor carrier frequency is dynamic change simultaneously, according to the measurement that can use resource to that major-minor carrier frequency of sub-district, when major-minor carrier frequency can use resource that bigger variation takes place, change the frequency of main carrier frequency, it is switched on the many assistant carrier frequencies of available resources.Because major-minor carrier frequency can be admitted, can carry out at several frequencies so admit, so collision probability is little.If the user who has resided on the former carrier frequency is synchronous with former carrier frequency, can on former carrier frequency, admit, owing to do not need to carry out the sub-district gravity treatment, alleviated the burden of UE.Assistant carrier frequency does not have owing to have only main carrier frequency that TS0 is arranged simultaneously, so the TS0 interference is also fewer, UE measures by the PCCPCH RSCP that measures main carrier frequency, is directly switch to the main carrier frequency probability of successful than higher.
Claims (3)
1. the major-minor carrier frequency method of adjustment of multi-carrier frequency cell in the TD-SCDMA system may further comprise the steps:
1.1 in multi-carrier frequency cell, select a carrier frequency as main carrier frequency, other carrier frequency are as assistant carrier frequency; Main carrier frequency uses identical scrambler and the Midamble of basic midamble code with assistant carrier frequency;
1.2 set up the sub-district, activate the time slot 0 and the descending pilot frequency time slot of main carrier frequency, at the time slot 0 and the descending pilot frequency time slot transmission signal of main carrier frequency; The time slot 0 and the descending pilot frequency time slot of shielding assistant carrier frequency, the time slot 0 and the descending pilot frequency time slot of assistant carrier frequency do not send signal, and the Your Majesty is total to channel configuration to main carrier frequency;
1.3 power, interference and load to major-minor carrier frequency are measured, according to the stock number used of the major-minor carrier frequency of measuring of outcome evaluation;
If can use resource greater than a thresholding that can use resource on the major-minor carrier frequency less than using resource to be lower than on the thresholding of worst-case value and the assistant carrier frequency on the main carrier frequency 1.4 can use resource on the main carrier frequency, or can use resource can use resource less than a thresholding that can use resource on the major-minor carrier frequency on the assistant carrier frequency greater than using resource to be higher than on the thresholding of best values and the main carrier frequency on the assistant carrier frequency, or can use resource on the main carrier frequency less than using resource to deduct the sluggish parameter of resource on the major-minor carrier frequency on the assistant carrier frequency, then
Broadcast the message that major-minor carrier frequency will be reshuffled, make all users all on new main carrier frequency, receive broadcast, and forward step 1.5 to; Otherwise forward step 1.3 to;
Switch 1.5 initiate major-minor carrier frequency, current use main carrier frequency is switched to assistant carrier frequency, delete its common signal channel,, on new main carrier frequency, set up common signal channel, change step 1.2 using the maximum assistant carrier frequency of stock number to switch to main carrier frequency.
2. the major-minor carrier frequency method of adjustment of multi-carrier frequency cell in the described TD-SCDMA of claim 1 system is characterized in that, the selection of main carrier frequency be at random or backstage configuration.
3. the major-minor carrier frequency method of adjustment of multi-carrier frequency cell in the described TD-SCDMA of claim 1 system, it is characterized in that, a lag time is set, power, interference and load to major-minor carrier frequency in the described step 1.3 are measured, according to the stock number used of the major-minor carrier frequency of measuring of outcome evaluation, be to carry out once every a lag time.
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