CN1518367A - Multi-band small range selection method - Google Patents
Multi-band small range selection method Download PDFInfo
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- CN1518367A CN1518367A CNA031004547A CN03100454A CN1518367A CN 1518367 A CN1518367 A CN 1518367A CN A031004547 A CNA031004547 A CN A031004547A CN 03100454 A CN03100454 A CN 03100454A CN 1518367 A CN1518367 A CN 1518367A
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Abstract
A multi-band small-region choosing method for the multi-band CDMA system includes such steps as turning on a mobile station, receiving the band choosing information containing the priority information of small-region band, measuring and calculating the intensity of received signal in the small-region and the carrier/interference ratio of pilot channel, staying in the first small-region whose signal intensity and carrier/interference ratio can meet the system requirement, receiving the small-region choosing signal from base station, measuring and calculating the intensity of received signal and the carrier/interference ratio of pilot channel, and staying in the small-region with optimal parameters.
Description
Technical field
The present invention relates to the multiband cell selecting technology of wireless communication system, be specifically related to a kind of implementation method that is applicable to the multiband cell selecting in multiband code division multiple access (CDMA) system.
Background technology
Present wireless communication system mainly comprises gsm (GSM) and two kinds of forms of cdma system.In the gsm system of operation, use 900MHz/1800MHz double frequency handoff solution usually at present.The two-band that system operator has used cell selecting and sub-district gravity treatment to solve under the idle condition is selected problem, travelling carriage can not carry out Frequency Band Selection according to pilot signal strength, the native region priority of current area signal and peripheral cell, resides in which sub-district during with the decision Idle state.So on the one hand by traffic guiding, more reasonably allocation of network resources; Also increased the cell capacity of physical area on the other hand, make user that more user can access network, particularly hot zones can be under the situation that does not influence communication quality access network successfully.
In gsm system, when just having started shooting, travelling carriage can carry out Frequency Band Selection, sub-district primary election just.This moment, travelling carriage received the system message from the broadcasting of Dedicated Control Channel, and carried out cell selecting according to following two cell parameters: the physical quantity C1 of cell selecting priority and characterization signal intensity.Wherein the account form of C1 is:
C1＝(received_level-rxlev_access_min)-Max(ms_txpwrmax_cch-p，0)
In following formula, received_level is a travelling carriage average received level; Rxlev_access_min is the minimum incoming level that travelling carriage allows access; Ms_txpwr_max_cch is the control channel maximal power level; P is the actual maximum transmission power of travelling carriage.
In the actual selection process, the value that at first requires C1 is greater than zero, selects the highest sub-district of priority to register at all C1 under greater than zero situation then.Carry out relative set by priority like this to the different frequency range sub-district, for example the priority level of the sub-district of 1800MHz is set to be higher than the sub-district of 900MHz, the sub-district of the preferential 1800MHz of selection in the time of can guiding the double frequency mobile platform started by setting, thereby the purpose of realization traffic guiding to priority.
When being in idle condition again after mobile platform started, travelling carriage carries out the sub-district gravity treatment according to some cycles after having carried out the initial registration cell selecting, and the foundation of gravity treatment is the C2 value, and its account form is:
When PENALTY_TIME ≠ predetermined value,
C2＝C1+CELL?RESELECT_OFFEST-TEMPORARY_OFFSET×H(PENALTY_TIME-T)
When the PENALTY_TIME=predetermined value,
C2＝C1-CELL_RESELECT_OFFEST
Wherein, CELL_RESELECT_OFFEST is sub-district gravity treatment biasing, is used for artificially revising the value of C2; TEMPORARY_OFFSET is interim biasing; PENALTY_TIME is a Penalty time, with the action time of deciding interim biasing; T is a timer, its initial value is zero, when certain sub-district is moved in six adjacent areas table that platform is recorded in the signal level maximum, timer T that should the sub-district is picked up counting, accuracy of timekeeping is a tdma frame, when this sub-district was removed from six adjacent area tables of mobile station signal level maximum, corresponding T was reset.If the sub-district gravity treatment takes place, previous Serving cell enters 6 adjacent area that level is the strongest tables, and then this T value is PENALTY_TIME.
In following formula, H (x) is a function, to non-service cell, and adjacent area just, H (x)=0 when x＜0; H (x)=1 when x＞0.For Serving cell, H (x)=0.
Travelling carriage is preferentially selected the high sub-district of C2 value, and waits on this sub-district.Different at non-service cell with the method that Serving cell calculates the C2 value, this is for fear of ping-pong occurring, just be in travelling carriage under the idle condition when the edge of two sub-districts, if two following sub-district Frequency Band Selection parameters of calculating of sub-district the present situation are more approaching, be easy to cause travelling carriage idle frequent switching between two sub-districts so, just table tennis switches, and causes travelling carriage frequently to be registered, and expends travelling carriage power.Therefore, can improve the C2 value of Serving cell relatively, reach the purpose of avoiding ping-pong by different computational methods.Simultaneously,, can guide the double frequency travelling carriage when gravity treatment, to select the 1800MHz sub-district as far as possible, to realize the purpose of traffic guiding by suitable setting to the side-play amount CELL_RESELECT_OFFEST in the C2 value and other parameters.
Above-mentioned is the Frequency Band Selection method of travelling carriage in the gsm system.For cdma system, in the cdma system standard that International Telecommunication Union formulates, available frequency band is divided, be divided into a plurality of optional frequency range classifications, and in Chinese at present cdma system, because the relation of telephone traffic has only been used frequency range classification 0 operation cdma system wherein.But along with increasing sharply of CDMA number of users, can predict, to hot zones such as big cities, the information service of only using a frequency range to provide to comprise data service will more and more can not be satisfied user's demand, and it is more and more nervous that local resource will become.At this moment, will inevitably also will use a plurality of frequency ranges and carry out message transmission as GSM.Just, will be used for original frequency range classification 0 cell load capacity is shunted in the mode of stack in the sub-district of hot zones stack different frequency range, artificially guide the user reasonably resident on the different frequency range sub-district, to solve the loading problem of hot zones, for the user provides better service.
Because cdma system is not used multiband as yet, therefore there is not the solution of corresponding multiband selection yet.And there are a lot of difference in cdma system and gsm system because adopt different systems, therefore the Frequency Band Selection method of present gsm system directly can not be moved in the cdma system.For this reason, the applicant has proposed a kind of system and method that is applied to the multiband cell selecting of cdma system in patent application 02158913.5, increase the module that is used for the multiband cell selecting respectively by base station and travelling carriage, can realize to carry out the cdma system of multiband cell selecting at cdma system.In this patent application, proposed to realize the process of multiband cell selecting, but do not provided the concrete selection course of the acquisition process and the target persistent district of Frequency Band Selection parameter in detail by the interacting message between each module.
At present in the cdma system and sub-district is switched relevant method and is comprised: the free time under the idle condition switches, the business under the access state is redirected and talking state under direct-cut operation between different frequency range or the frequency range sub-district.
Because cdma system does not use multiband, the idle condition cell selecting of using in the cdma system is only considered same frequency range, and this selection is initiatively carried out by travelling carriage.When other district pilots intensity of mobile station testing surpass current area 3dB, trigger idle the switching.Because whole switch decision is finished alone by travelling carriage, the base station can't be intervened, and therefore can't play the traffic guiding function.Owing to do not consider the factor of a plurality of frequency ranges, therefore this method can not be used for simply multiband cdma system multiband cell selecting simultaneously.
Business under the access state is redirected and only occurs under the situation that travelling carriage begins to exhale, after the beginning that receives travelling carriage when the base station exhales signal, can select to indicate travelling carriage to insert again to adjacent cell, which sub-district channeling conduct is whole process insert based on the Signalling exchange between travelling carriage and the base station to travelling carriage.
Direct-cut operation under the talking state between different frequency range or the frequency point cell, be meant that the travelling carriage that is under the talking state switches between different frequency range or frequency point cell, when the travelling carriage of for example conversing moves to another sub-district from a sub-district, will at first disconnect the contact with former sub-district, and then relate to new sub-district.
In three kinds of changing methods saying in the above, carry out that business under the access state is redirected and talking state under the travelling carriage of direct-cut operation be not to be in idle condition, be not suitable for the multiband cell selecting of travelling carriage under the idle condition.In the free time switching under idle condition, though travelling carriage is in idle condition, idle switching can only be carried out between identical frequency range sub-district, is not suitable for the switching between the different frequency range sub-district.Therefore, also there is not at present a kind of method that the travelling carriage that is in idle condition is switched between the different frequency range sub-district.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of travelling carriage and can in the multiband cdma system, determine target persistent district and the method for switching between the multiband sub-district.
Above-mentioned purpose of the present invention is achieved by the following technical solutions:
A kind of multiband cell selecting implementation method of multiband cdma system comprises the steps:
A. obtain the Frequency Band Selection information that comprises sub-district frequency range precedence information at least that is used for sub-district primary election after the mobile platform started, and according to Frequency Band Selection information one by one measurements and calculations can insert the received signal strength indicator value and the pilot channel carrier/interface ratio of sub-district, resident first sub-district of satisfying system requirements of travelling carriage to received signal strength indicator value and pilot channel carrier/interface ratio;
B. travelling carriage receives the Frequency Band Selection information that is used for the sub-district gravity treatment from the base station, measure and calculate the received signal strength indicator value and the pilot channel carrier/interface ratio of current area and all adjacent areas, and satisfy the frequency range judgement reference value of the sub-district of system requirements, the resident sub-district of travelling carriage according to Frequency Band Selection information calculations received signal strength indicator value and pilot channel carrier/interface ratio to frequency range judgement reference value maximum.
In above-mentioned multiband cell selecting implementation method, the Frequency Band Selection information that is used for sub-district primary election further comprises received signal intensity level thresholding, pilot channel carrier/interface ratio thresholding, system's adjacent area band information and comprises the sub-district band information that each can insert sub-district frequency range precedence information.These Frequency Band Selection information stores are in travelling carriage inside, and may further include the frequency that comprises the frequency range precedence information tabulation that puts in order, and obtain the Frequency Band Selection information that is used for sub-district primary election by reading Frequency Band Selection information after the mobile platform started among the step a.
In above-mentioned multiband cell selecting implementation method, step a may further include following steps:
A11. travelling carriage according to the frequency in the Frequency Band Selection information tabulation that puts in order determine the moving table measuring order, and at first measure the put in order received signal intensity level of first sub-district in the tabulation of frequency;
A12. travelling carriage compares the respective doors limit value in measured value and the Frequency Band Selection information, if the received signal intensity level of measuring more than or equal to the respective doors limit value, execution in step a13, otherwise execution in step a14;
A13. measure this district pilots intensity and calculate the pilot channel carrier/interface ratio, respective doors limit value in itself and the Frequency Band Selection information is compared, if the pilot channel carrier/interface ratio of calculating more than or equal to the respective doors limit value, resident this sub-district of travelling carriage then, process ends, otherwise execution in step a14;
A14. travelling carriage judges that whether the sub-district of current measurement is put in order last sub-district in the tabulation of frequency, if travelling carriage can not network, process ends; The received signal intensity level of the next sub-district otherwise the moving table measuring frequency puts in order in the tabulation, repeated execution of steps a12.
In above-mentioned multiband cell selecting implementation method, the Frequency Band Selection information that is used for sub-district primary election is attached to the synchronizing channel system message that the base station sends, and obtains the Frequency Band Selection information that is used for sub-district primary election by receive the synchronizing channel system message from the base station after the mobile platform started among the step a.
In above-mentioned multiband cell selecting implementation method, step a may further include following steps:
A21. travelling carriage is determined the highest frequency range of frequency range priority according to Frequency Band Selection information, and at first measures the received signal intensity level of the dominant frequency point sub-district of the highest frequency range of frequency range priority;
A22. travelling carriage compares the respective doors limit value in measured value and the Frequency Band Selection information, if the received signal intensity level of measuring more than or equal to the respective doors limit value, execution in step a23, otherwise execution in step a24;
A23. measure this district pilots intensity and calculate the pilot channel carrier/interface ratio, respective doors limit value in itself and the Frequency Band Selection information is compared, if the pilot channel carrier/interface ratio of calculating more than or equal to the respective doors limit value, resident this sub-district of travelling carriage then, process ends, otherwise execution in step a24;
A24. judge whether the current persistent district of travelling carriage is the minimum frequency range sub-district of frequency range priority, if travelling carriage continues resident this sub-district, process ends, otherwise determine the frequency range of the low one-level of the relative current area frequency range of frequency range priority, repeated execution of steps a22 according to Frequency Band Selection information.
In above-mentioned multiband cell selecting implementation method, comprise further among the step a that travelling carriage selects to be used for the step of acquisition methods of the Frequency Band Selection parameter of sub-district primary election after start.
In above-mentioned multiband cell selecting implementation method, the Frequency Band Selection parameter that is used for the sub-district gravity treatment comprises received signal intensity level thresholding, pilot channel carrier/interface ratio thresholding, Frequency Band Selection time threshold and is offset corresponding to the relative access skew and the interim relative access of different frequency range.These Frequency Band Selection parameters can be attached in the expansion system information in neighboring area by the base station and send, perhaps send by the other system message on broadcast channel or the paging channel by the base station separately, perhaps independent composition Frequency Band Selection message sends, and travelling carriage receives the Frequency Band Selection information that is used for the sub-district gravity treatment of obtaining among the step b from the base station.
In above-mentioned multiband cell selecting implementation method, the received signal intensity level thresholding, pilot channel carrier/interface ratio thresholding, the Frequency Band Selection time threshold that are used for the sub-district gravity treatment are stored in travelling carriage inside, corresponding to the relative access skew of different frequency range and interim relative the access in the message that skew is attached to the base station transmission, travelling carriage obtains the Frequency Band Selection information that is used for the sub-district gravity treatment from travelling carriage inside and base station respectively among the step b.
In above-mentioned multiband cell selecting implementation method, step b calculate frequency range judgement reference value method can for: for current area, frequency range judgement reference value be carrier/interface ratio, relatively insert skew and chronon with interim relative insert skew amass and; For the adjacent area, frequency range judgement reference value is carrier/interface ratio and relative access skew sum.
In above-mentioned multiband cell selecting implementation method, chronon is 1 at the inner Frequency Band Selection timer of travelling carriage timing during less than predefined Frequency Band Selection time threshold, more than or equal to the Frequency Band Selection time threshold time, be 0, the Frequency Band Selection timer starts behind completing steps a, travelling carriage is whenever finished once idle switching, zero clearing of Frequency Band Selection timer and reclocking afterwards.
In above-mentioned multiband cell selecting implementation method, insert skew relatively and can be set to 0.5dBm with the interim relative step value that inserts skew.
In above-mentioned multiband cell selecting implementation method, satisfy system requirements among step a and the step b and be meant that the received signal intensity level of sub-district and pilot channel carrier/interface ratio are respectively more than or equal to the respective doors limit value in the Frequency Band Selection information.
From technique scheme as can be seen, in the cdma system of multiband, sub-district primary election of the application of the invention and sub-district gravity treatment, travelling carriage can be determined a suitable target persistent district in the multiband sub-district, system operator can be allocated travelling carriage is selected different frequency range under firm open state or idle condition sub-district by correct guidance, and then the balance sysmte resource, for the user provides better service.
Simultaneously, the present invention suitably introduces the interim skew that inserts relatively in the gravity treatment of sub-district, has avoided the travelling carriage switching of rattling between two sub-districts, and the use cost of having saved user of mobile station has been optimized the utilization of whole Internet resources.
Description of drawings
Fig. 1 is the flow chart of multiband cell selecting implementation method of the present invention;
Fig. 2 is the flow chart that the operation parameter storage method is carried out sub-district primary election among the present invention;
Fig. 3 is the frame structure schematic diagram of Mid Frequency parameter of the present invention;
Fig. 4 is the flow chart that using system message judgement method is carried out sub-district primary election among the present invention;
Fig. 5 is the frame structure schematic diagram of Mid Frequency offset parameter of the present invention;
Fig. 6 is the frame structure schematic diagram of interim frequency range offset parameter among the present invention;
Fig. 7 is the flow chart of sub-district gravity treatment among the present invention.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
In the present invention, the travelling carriage of multiband cdma system can select a sub-district to register when start just, and this process is exactly sub-district primary election.Travelling carriage carries out sub-district primary election two kinds of methods, a kind of is system message judgement method, just receive Sync Channel Message from the base station, from Sync Channel Message, obtain the Frequency Band Selection parameter of travelling carriage current area and all adjacent areas, then by measuring or calculate received signal intensity indication (RSSI) value and the Ec/Io of dominant frequency point sub-district on these frequency ranges, take all factors into consideration native region priority information, thereby determine persistent district.
The another kind of method of sub-district primary election is the parameter storage method, band informations just that all are commonly used according to frequency range priority sequential storage from high to low in travelling carriage inside, and in the frequency range of same priority, this frequency range different frequent points sub-district also is stored in wherein in order, form the tabulation that puts in order of a frequency.Here so-called band information commonly used can determine that by system operator the present invention does not carry out any restriction to this as the case may be.When mobile platform started, sub-district according to storage puts in order and carries out sequential search, can resident condition if satisfy some sub-districts, this sub-district is persistent district, can resident condition if this sub-district is discontented, search for so again frequency put in order the tabulation in next sub-district, and judge whether this sub-district satisfies can resident condition, can resident condition if satisfy, this sub-district is persistent district, can resident condition if still discontented, search for so again frequency put in order the tabulation in next again sub-district, the rest may be inferred, determine at last one satisfy can resident condition and frequency range priority is the highest relatively sub-district as persistent district, thereby finish sub-district primary election.
After finishing sub-district primary election, travelling carriage regularly receives Neighboring Cell List message and the expansion system information in neighboring area that base station sub-system periodically sends, from the expansion system information in neighboring area, obtain the essential information and the needed Frequency Band Selection parameter of sub-district gravity treatment of adjacent all sub-districts around Serving cell at present, by the sub-district reselection algorithm, determine suitable resident frequency range sub-district, cdma system can be realized the purpose of traffic guiding by the load on the reasonable distribution different frequency range like this.
Idiographic flow of the present invention as shown in Figure 1.Below in conjunction with Fig. 1 whole flow process of the present invention is described.
In step 101, travelling carriage is by judging that to being provided with of the first choosing method in sub-district current is to adopt the parameter storage method or adopt system message judgement method to carry out sub-district primary election.This set can be stored in the travelling carriage, and the user can change this set.Certainly, also can adopt other method notice travelling carriage to adopt which kind of method.If travelling carriage determines to adopt the parameter storage method to carry out sub-district primary election, then execution in step 102,103,106 and subsequent step; If travelling carriage determines to adopt system message judgement method to carry out sub-district primary election, then execution in step 104,105,106 and subsequent step.
In step 102,103, travelling carriage reads the frequency that the is stored in travelling carriage inside tabulation that puts in order, and the operation parameter storage method is carried out sub-district primary election, and detailed process will be introduced in the back.
In step 104,105, travelling carriage receives the Sync Channel Message from the base station, and using system message judgement method is carried out sub-district primary election, and detailed process also will be introduced in the back.
In step 106, travelling carriage is determined the target persistent district according to the result of sub-district primary election, and the free time switches to determined target persistent district and resident in this sub-district then.
In step 107, travelling carriage starts the Frequency Band Selection timer, and the Frequency Band Selection timer picks up counting, and the purpose of carrying out timing here is to avoid the table tennis in the cell reselection process to switch, and this point will describe in detail when introducing the sub-district gravity treatment.
In step 108,109, travelling carriage regularly receives the expansion system information in neighboring area of persistent district, and carries out the sub-district gravity treatment according to the frequency range decision parameter in the expansion system information in neighboring area.The expansion system information in neighboring area here is by the base station timed sending in the prior art.Cell reselection process will describe in detail in the back.
In step 110, travelling carriage is determined the target persistent district according to sub-district gravity treatment result.
In step 111, travelling carriage judges whether determined target persistent district is current persistent district, if, travelling carriage does not carry out any action, still reside in this sub-district, re-execute step 108 then, promptly regularly receive the expansion system information in neighboring area of persistent district and carry out the sub-district gravity treatment; If not, execution in step 112.
In step 112, the travelling carriage free time switches to determined target persistent district and resides in this sub-district, restarts the Frequency Band Selection timer simultaneously.Re-execute step 108 then, promptly regularly receive the expansion system information in neighboring area of persistent district and carry out the sub-district gravity treatment.
Regularly carry out because cell reselection process is the travelling carriage that is in idle condition, therefore as long as travelling carriage does not shut down, the process of sub-district gravity treatment will move in circles down.
Whole flow process of the present invention has been described above.Specify below and how to carry out the sub-district primary election of parameter storage method, the sub-district primary election of system message judgement method, and specify the process of sub-district gravity treatment.
1, parameter storage method sub-district primary election.
When the operation parameter storage method is carried out sub-district primary election, need in advance frequency range cell information commonly used to be arranged in descending order according to priority, the sub-district of same frequency range priority requires sequence arrangement according to other again, and the present invention does not carry out any restriction to other requirements here.Form the tabulation that puts in order of frequency that an expression sub-district puts in order like this, as the part of the Frequency Band Selection information that is used for sub-district primary election, it also is stored in travelling carriage inside.When mobile platform started, at first read the frequency that the is stored in travelling carriage inside list information that puts in order, first sub-district of the frequency range that at first search priority is the highest then, the pilot channel RSSI and the Ec/Io of this sub-district of measurements and calculations, if the measurements and calculations result satisfies the requirement of multiband cell selection system to RSSI and Ec/Io, mobile station in selecting resides in this sub-district, promptly select this frequency range sub-district to register for the target persistent district, if being arranged among RSSI and the Ec/Io, a parameter is discontented with the pedal system requirement, measurements and calculations are carried out in the next sub-district of then selecting frequency to put in order in tabulating, and the like.
Above said measurement result satisfy system requirements and be meant RSSI of system and Ec/Io parameter all respectively more than or equal to the minimum threshold of system regulation, i.e. RSSI 〉=Min_RSSI_Level, and Ec/Io 〉=Min_C/I_Level.Min_RSSI_Level here and Min_C/I_Level are the minimum thresholds that is stored in travelling carriage inside, their concrete definition and describe as shown in table 1.In concrete application process, at first measure the pilot channel RSSI of first the highest sub-district of frequency range priority, if RSSI 〉=Min_RSSI_Level measures this district pilots channel Ec/Io again, if during Ec/Io 〉=Min_C/I_Level, select this frequency range sub-district to register.If RSSI＜Min_RSSI_Level or Ec/Io＜Min_C/I_Level select next sub-district to carry out measurements and calculations, till having determined a sub-district that meets the demands.
Below in conjunction with Fig. 2 its idiographic flow is described.
In step 201, travelling carriage at first reads the frequency that the is stored in travelling carriage inside tabulation that puts in order after start.
In step 202, travelling carriage obtains the sub-district band information from frequency puts in order tabulation, comprise frequency range precedence information and search order.
In step 203, the moving table measuring frequency RSSI of first sub-district in the tabulation that puts in order.
In step 204, whether the RSSI value that determining step 203 is measured more than or equal to Min_RSSI_Level, if, execution in step 205 and subsequent step; Otherwise execution in step 210 and subsequent step.
In step 205, the pilot frequency intensity of this sub-district of moving table measuring.
In step 206, travelling carriage calculates corresponding Ec/Io according to the pilot frequency intensity value that a last step is measured.
In step 207, whether the Ec/Io value that determining step 206 calculates more than or equal to Min_C/I_Level, if, execution in step 208 and 209; Otherwise execution in step 210 and subsequent step.
In step 208, travelling carriage determines that this sub-district is the target persistent district and resides in this sub-district.
In step 209, travelling carriage starts the Frequency Band Selection timer that is used for cell reselection process, finishes sub-district primary election process.
In step 210, travelling carriage judges that whether the sub-district of current measurement is last sub-district in the resource of frequency range priority list, if travelling carriage can not network, process ends; Otherwise execution in step 211.
In step 211, travelling carriage is measured the next sub-district that frequency puts in order in tabulating, and whether execution in step 204 and subsequent step are the target persistent districts with definite this sub-district then.
The sub-district primary election of parameter storage method need not the travelling carriage reception just can be carried out from the system message of base station side, realizes simple.
2, system message judgement method sub-district primary election.
The flow process of system message judgement method is similar with parameter storage method shown in Figure 2, its difference is: in step 201, travelling carriage is not to obtain current adjacent area band information by reading the frequency that the is stored in travelling carriage inside tabulation that puts in order, but obtains the adjacent area band information by receiving the current area synchronization message.In addition, two threshold value Min_RSSI_Level and Min_C/I_Level neither be stored in travelling carriage inside, but obtain by receiving the current area synchronization message equally.Also have, travelling carriage carries out the parameter storage method and carries out not connecting system of sub-district primary election fashion, and using system message judgement method sub-district in the connecting system when carrying out sub-district primary election.
When using system message judgement method is carried out sub-district primary election, Frequency Band Selection parameter as shown in table 1 need be attached among the synchronizing channel system message.Travelling carriage at first receives the Frequency Band Selection parameter in the synchronizing channel system message when start just like this.
| Field | Implication | Length |
| Min_RSSI_Level | Received signal intensity level thresholding, travelling carriage can correctly receive the minimum threshold of base station information, is equivalent to the receiving sensitivity of travelling carriage here | 4 bits |
| Min_C/I_Level | Pilot channel carrier/interface ratio thresholding, travelling carriage be the carrier/interface ratio minimum threshold of demodulation base station information correctly | 4 bits |
| Band_Class | System's adjacent area band information, the frequency range classification information of using in the expression system | 9 bits |
| Band_Class_Info(0..n) | The band information of sub-district comprises information such as frequency range priority | 4 bits |
Table 1
In these 4 newly-increased parameters, Min_RSSI_Level and Min_C/I_Level are optional part, for saving common channel resources, the synchronizing channel system message also can not send these two parameters, this moment, travelling carriage acquiescence Min_RSSI_Level was standard code travelling carriage receiving sensitivity-104dBm, and Min_C/I_Level is a standard code travelling carriage demodulation carrier/interface ratio thresholding.
Band_Class is system's adjacent area band information, and its frame structure as shown in Figure 3.As can be seen from Figure 3,9 significant bits are represented frequency range classification 0～frequency range classification 8 respectively among the Band_Class, and wherein the 1st bit represents whether to exist the sub-district of frequency range classification 0, and the 2nd bit represents whether to exist the sub-district of frequency range classification 1.And the like.Bit is the sub-district that there is not the corresponding frequency band classification in 0 interval scale, and bit is the sub-district that there is the corresponding frequency band classification in 1 interval scale.In example shown in Figure 3, the 1st is the sub-district that has frequency range classification 0 around the 1 expression current area.The 6th is the sub-district that has frequency range classification 5 around the 1 expression current area, and other figure places are the sub-district of not containing the corresponding band classification around the 0 expression current area.
Band_Class_Info comprises the frequency range precedence information, just for each the frequency range classification that exists among the Band_Class, and all corresponding frequency range priority.In the present invention frequency range priority is divided into four classes, as shown in table 2.
| Value | Priority |
| ????00 | Ban use of |
| ????01 | Low |
| ????10 | In |
| ????11 | High |
Table 2
Carry out idiographic flow that system message judgement method carries out sub-district primary election as shown in Figure 4.
In step 401, travelling carriage at first receives the synchronizing channel system message that the base station sends behind start and sub-district of connecting system.
In step 402, travelling carriage obtains the frequency range precedence information of current area and all adjacent areas from frequency puts in order tabulation.
In step 403, mobile station in selecting current area and the highest frequency range of all adjacent area Mid Frequency information medium priorities are measured the RSSI of its dominant frequency point sub-district.
In step 404, whether the RSSI value that determining step 403 is measured more than or equal to Min_RSSI_Level, if, execution in step 405 and subsequent step; Otherwise execution in step 409 and subsequent step.
In step 405, the pilot frequency intensity of this sub-district of moving table measuring.
In step 406, travelling carriage calculates corresponding Ec/Io according to the pilot frequency intensity value that a last step is measured.
In step 407, whether the Ec/Io value that determining step 406 calculates more than or equal to Min_C/I_Level, if, execution in step 408,411; Otherwise execution in step 409 and subsequent step.
In step 408, travelling carriage determines that this sub-district is the target persistent district and resides in this sub-district.
In step 409, travelling carriage judges that whether the frequency range of current area is last frequency range in the priority list, if, execution in step 410 and 411; Otherwise execution in step 412.
In step 410, travelling carriage determines that this sub-district is the target persistent district and resides in this sub-district.
In step 411, travelling carriage starts the Frequency Band Selection timer that is used for cell reselection process, finishes sub-district primary election process.
In step 412, the dominant frequency point sub-district of the frequency range of the low relatively one-level of mobile station in selecting frequency range priority is measured, and whether execution in step 404 and subsequent step are the target persistent districts with definite this sub-district then.
3, sub-district gravity treatment.
In order to realize that travelling carriage carries out the sub-district gravity treatment under idle condition, the Frequency Band Selection parameter that needs in the cell reselection process is attached to from the existing expansion system information in neighboring area that the base station sends, just in the expansion system information in neighboring area, increases the parameter shown in the table 3.
| Field | Implication | Length |
| Min_RSSI_Level | Received signal intensity level thresholding, travelling carriage can correctly receive the minimum threshold of base station information, is equivalent to the receiving sensitivity of travelling carriage here | 4 bits |
| Min_C/I_Level | Pilot channel carrier/interface ratio thresholding, travelling carriage be the carrier/interface ratio minimum threshold of demodulation base station information correctly | 4 bits |
| Time_Access_Level | The Frequency Band Selection time threshold, switch for avoiding travelling carriage between system, frequently to carry out the free time, improve the current area handoff threshold in the scope between at this moment | 4 bits |
Table 3
And, in the expansion system information in neighboring area, prepare to join each concentrated pilot tone of adjacent pilot frequencies and comprise a parameter as shown in table 4 for travelling carriage.
| Field | Implication | Length |
| Band_Offset | Relatively insert skew, represent to insert thresholding relatively between each frequency range | 5 bits |
| Temp_Band_Offset | The interim access relatively is offset, for prevent the wireless environment comparing class like the time, table tennis between the different frequency range switches, and artificially formulates connecting into threshold value at that time | 2 bits |
Table 4
In these 5 newly-increased frequency range decision parameter, Min_RSSI_Level, Min_C/I_Level and Time_Access_Level also can not be attached in the expansion system information in neighboring area, and are to use the fixed value that is stored in travelling carriage inside.For example, the Min_RSSI_Level of travelling carriage acquiescence is travelling carriage receiving sensitivity-104dBm.As for Min_C/I_Level, because the scope that travelling carriage can receive base station pilot channels Ec/Io is 0～-15dB, wherein-think more than the 7dB that present channel conditions is relatively good,-7～-think that current channel conditions is general between the 12dB, think below-the 12dB that current channel conditions is poor, can store the value of one of them value in travelling carriage inside as Min_C/I_Level.The default value of Time_Access_Level can be chosen with system requirements as the case may be, here repeats no more.
Be included in B parameter and_Offset in the table 4 represent present adjacent area with respect to current area can insert thresholding relatively, can distinguish the complexity that inserts between the different districts by it, in cell reselection process, it is used to distinguish the priority of different districts.Fig. 5 shows its frame structure.As can see from Figure 5, the Band_Offset parameter has been used 5 bits, wherein the 5th bit is-symbol position from low to high, its represents the positive and negative of parameter value, for example the 5th is 1, and the expression parameter is a negative, and the 5th is that 0 expression parameter is a positive number.4 bits of back are represented the size of parameter value, and its occurrence is that the binary number that 4 bits are represented multiply by a step value, and here step value can be got 0.5dB.In frame structure shown in Figure 5, the 5th is 1 so, and the expression parameter is a negative, and 4 bits in back are 0100, and decimal value is 4, so the parameter value size is: 4 * 0.5dB=2dB.The parameter value of Band_Offset is-2dB.
The parameter Temp_Band_Offset that is included in the table 4 improves the current area access threshold value of other adjacent areas relatively temporarily, and it effectively, is used to prevent travelling carriage frequent idle switching between different districts in a period of time, prevent that just table tennis from switching.Fig. 6 shows its frame structure.As can see from Figure 6, the Temp_Band_Offset parameter has been used two bits, and it is parameter value that the binary value of these two bit representatives multiply by a step value.The step value is here got 0.5dB equally.In frame structure shown in Figure 6, binary value is 2, so parameter value is: 2 * 0.5dB=1dB so.
Introduced above and needed the frequency range decision parameter used and their sending method in the gravity treatment of sub-district.Introduce the whole process of sub-district gravity treatment below.For the base station, it only need be updated to the expansion system information in neighboring area of original timed sending outside the expansion system information in neighboring area that increases after the Frequency Band Selection parameter, does not need other any changes.For travelling carriage, then carry out the sub-district gravity treatment according to following method.
The principle of sub-district gravity treatment is under the situation of compliance with system minimum requirements, selects the maximum adjacent cell of frequency range judgement reference value Cx value to register.The multifrequency travelling carriage regularly receives the system message that sends from the base station, when receiving the expansion system information in neighboring area, according to the adjacent area basic parameter that provides in this message, measure the forward direction transmission level RSSI and the pilot channel Ec/Io of each adjacent area respectively, select the sub-district of RSSI 〉=Min_RSSI_Level and Ec/Io 〉=Min_C/I_Level to calculate and adjudicate according to following formula:
Current persistent district:
Cx
o＝(Ec/Io)
o+(Band_Offset)
o+T×(Temp_Band_Offset)
o
Wherein T is a Frequency Band Selection timer timing, and each travelling carriage carries out starting the Frequency Band Selection timer after cell selecting and the sub-district gravity treatment, is used to avoid travelling carriage frequent idle switching between different districts, and the value defined of T is as follows:
T=1 is as timer timing＜Time_Aceeess_Level
=0 as timer timing 〉=Time_Aceeess_Level
Other adjacent areas are as its pilot channel RSSI 〉=Min_RSSI_Level, during Ec/Io 〉=Min_C/I_Level:
Judgement: according to top formula, travelling carriage calculates all and satisfies pilot channel RSSI 〉=Min_RSSI_Level, the value of the Cx of the adjacent area of Ec/Io 〉=Min_C/I_Level, and selection switches to the sub-district of Cx maximum in all frequency range sub-districts.
The same with gsm system, the method that Cx value is calculated in current here persistent district and adjacent area is different, has increased in the calculating of current persistent district Cx that T * (Temp_Band_Offset), this is in order to prevent the table tennis switching.Just when just switching to new sub-district, artificially improve the handoff threshold of this sub-district within a certain period of time, just carrying out the free time when Cx value that prevents other sub-districts only is higher than the Cx value of this sub-district a little switches.Behind the process certain hour, this protection thresholding disappears.So just can avoid idle switching of carrying out frequent between different districts.
The idiographic flow of sub-district gravity treatment is described below in conjunction with Fig. 7.
In step 701, travelling carriage receives the expansion system information in neighboring area, obtains the Frequency Band Selection parameter.
In step 702, travelling carriage carries out the measurement of RSSI and pilot frequency intensity to all adjacent areas.
In step 703, travelling carriage calculates corresponding Ec/Io according to the pilot frequency intensity value that measures.
In step 704, travelling carriage determines that RSSI value and Ec/Io value all are higher than all sub-districts of the threshold value in the Frequency Band Selection parameter.
In step 705, the Cx value of each sub-district that travelling carriage calculation procedure 704 is determined.As previously mentioned, switch for fear of table tennis, the computational methods of the Cx value of current here persistent district and adjacent area are different.
In step 706, travelling carriage selects the maximum sub-district of a Cx value as the target persistent district according to the Cx value of calculating in step 704 and the step 705.
In step 707, whether the Target cell that determining step 706 is determined is current area, if, then do not need to switch, finish a sub-district gravity treatment; If not, execution in step 708 and 709 then.
In step 708, the travelling carriage free time switches to the Target cell that step 706 is determined.
In step 709, travelling carriage restarts the Frequency Band Selection timer, finishes a sub-district gravity treatment then.
In specific implementation process of the present invention, the Frequency Band Selection parameter that is used for the sub-district gravity treatment also can not be additional among the expansion system information in neighboring area, and be additional to the other system message that the base station sends, perhaps be combined into Frequency Band Selection message separately and send to travelling carriage by broadcasting or beep-page message by the base station.In addition and since at present in the cdma system certainty of measurement of travelling carriage be 0.5dBm, for the existing system compatibility, the step value of Band_Offset provided by the invention and Temp_Band_Offset also is set to 0.5dBm.But along with the development of moving table measuring technology, the step value here also can improve precision thereupon, is not limited to 0.5dBm.Therefore be appreciated that above-mentionedly, and be not used in restriction the present invention just to a kind of displaying of spirit of the present invention.
Claims (14)
1. the multiband cell selecting implementation method of a multiband cdma system comprises the steps:
A. obtain the Frequency Band Selection information that comprises sub-district frequency range precedence information at least that is used for sub-district primary election after the mobile platform started, and according to described Frequency Band Selection information one by one measurements and calculations can insert the received signal strength indicator value and the pilot channel carrier/interface ratio of sub-district, resident first sub-district of satisfying system requirements of travelling carriage to described received signal strength indicator value and pilot channel carrier/interface ratio;
B. travelling carriage receives the Frequency Band Selection information that is used for the sub-district gravity treatment from the base station, measure and calculate the received signal strength indicator value and the pilot channel carrier/interface ratio of current area and all adjacent areas, and satisfy the frequency range judgement reference value of the sub-district of system requirements, the resident sub-district of travelling carriage according to described Frequency Band Selection information calculations described received signal strength indicator value and pilot channel carrier/interface ratio to described frequency range judgement reference value maximum.
2. multiband cell selecting implementation method according to claim 1, it is characterized in that the described Frequency Band Selection information that is used for sub-district primary election further comprises received signal intensity level thresholding, pilot channel carrier/interface ratio thresholding, system's adjacent area band information and comprises the sub-district band information that each can insert sub-district frequency range precedence information.
3. multiband cell selecting implementation method according to claim 1, it is characterized in that, the described Frequency Band Selection information stores of sub-district primary election that is used for is in travelling carriage inside, and further comprise the frequency that comprises the frequency range precedence information tabulation that puts in order, obtain the Frequency Band Selection information that is used for sub-district primary election by reading described Frequency Band Selection information after the mobile platform started among the step a.
4. multiband cell selecting implementation method according to claim 3 is characterized in that described step a further comprises the steps:
A11. travelling carriage according to the frequency in the described Frequency Band Selection information tabulation that puts in order determine the moving table measuring order, and at first measure the put in order received signal intensity level of first sub-district in the tabulation of frequency;
A12. travelling carriage compares the respective doors limit value in described measured value and the Frequency Band Selection information, if the received signal intensity level of measuring more than or equal to the respective doors limit value, execution in step a13, otherwise execution in step a14;
A13. measure this district pilots intensity and calculate the pilot channel carrier/interface ratio, respective doors limit value in itself and the Frequency Band Selection information is compared, if the pilot channel carrier/interface ratio of calculating more than or equal to the respective doors limit value, resident this sub-district of travelling carriage then, process ends, otherwise execution in step a14;
A14. travelling carriage judges that whether the sub-district of current measurement is put in order last sub-district in the tabulation of frequency, if travelling carriage can not network, process ends; The received signal intensity level of the next sub-district otherwise the moving table measuring frequency puts in order in the tabulation, repeated execution of steps a12.
5. multiband cell selecting implementation method according to claim 1, it is characterized in that, the described Frequency Band Selection information that is used for sub-district primary election is attached to the synchronizing channel system message that the base station sends, and obtains the Frequency Band Selection information that is used for sub-district primary election by receive described synchronizing channel system message from the base station after the mobile platform started among the step a.
6. multiband cell selecting implementation method according to claim 5 is characterized in that described step a further comprises the steps:
A21. travelling carriage is determined the highest frequency range of frequency range priority according to described Frequency Band Selection information, and at first measures the received signal intensity level of the dominant frequency point sub-district of the highest frequency range of frequency range priority;
A22. travelling carriage compares the respective doors limit value in described measured value and the Frequency Band Selection information, if the received signal intensity level of measuring more than or equal to the respective doors limit value, execution in step a23, otherwise execution in step a24;
A23. measure this district pilots intensity and calculate the pilot channel carrier/interface ratio, respective doors limit value in itself and the Frequency Band Selection information is compared, if the pilot channel carrier/interface ratio of calculating more than or equal to the respective doors limit value, resident this sub-district of travelling carriage then, process ends, otherwise execution in step a24;
A24. judge whether the current persistent district of travelling carriage is the minimum frequency range sub-district of frequency range priority, if travelling carriage continues resident this sub-district, process ends, otherwise determine the frequency range of the low one-level of the relative current area frequency range of frequency range priority, repeated execution of steps a22 according to Frequency Band Selection information.
7. multiband cell selecting implementation method according to claim 1 is characterized in that, comprises further among the step a that travelling carriage selects to be used for the step of acquisition methods of the Frequency Band Selection parameter of sub-district primary election after start.
8. multiband cell selecting implementation method according to claim 1, it is characterized in that the described Frequency Band Selection parameter that is used for the sub-district gravity treatment comprises received signal intensity level thresholding, pilot channel carrier/interface ratio thresholding, Frequency Band Selection time threshold and is offset corresponding to the relative access skew and the interim relative access of different frequency range.
9. multiband cell selecting implementation method according to claim 8, it is characterized in that, described all Frequency Band Selection parameters that are used for the sub-district gravity treatment are attached to the expansion system information in neighboring area by the base station and send, perhaps send by the other system message on broadcast channel or the paging channel by the base station separately, perhaps independent composition Frequency Band Selection message sends, and travelling carriage receives the described Frequency Band Selection information that is used for the sub-district gravity treatment of obtaining among the step b from the base station.
10. multiband cell selecting implementation method according to claim 8, it is characterized in that, described received signal intensity level thresholding, pilot channel carrier/interface ratio thresholding, the Frequency Band Selection time threshold that is used for the sub-district gravity treatment is stored in travelling carriage inside, corresponding to the relative access skew of different frequency range and interim relative the access in the message that skew is attached to the base station transmission, travelling carriage obtains the Frequency Band Selection information that is used for the sub-district gravity treatment from travelling carriage inside and base station respectively among the step b.
11. multiband cell selecting implementation method according to claim 8, it is characterized in that, the method that described step b calculates frequency range judgement reference value is: for current area, described frequency range judgement reference value be carrier/interface ratio, relatively insert skew and chronon with interim relative insert skew amass and; For the adjacent area, described frequency range judgement reference value is carrier/interface ratio and relative access skew sum.
12. multiband cell selecting implementation method according to claim 11, it is characterized in that, described chronon is 1 at the inner Frequency Band Selection timer of travelling carriage timing during less than predefined Frequency Band Selection time threshold, more than or equal to described Frequency Band Selection time threshold the time is 0, described Frequency Band Selection timer starts behind completing steps a, travelling carriage is whenever finished once idle switching, zero clearing of described Frequency Band Selection timer and reclocking afterwards.
13. multiband cell selecting implementation method according to claim 8 is characterized in that, described relative access skew is set to 0.5dBm with the interim relative step value that inserts skew.
14. according to claim 2 or 8 described multiband cell selecting implementation methods, it is characterized in that, satisfy system requirements described in step a and the step b and be meant that the described received signal intensity level of sub-district and pilot channel carrier/interface ratio are respectively more than or equal to the respective doors limit value in the Frequency Band Selection information.
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