CN1266862C - Multiple frequency band subzone selecting system and method - Google Patents
Multiple frequency band subzone selecting system and method Download PDFInfo
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- CN1266862C CN1266862C CN 02158913 CN02158913A CN1266862C CN 1266862 C CN1266862 C CN 1266862C CN 02158913 CN02158913 CN 02158913 CN 02158913 A CN02158913 A CN 02158913A CN 1266862 C CN1266862 C CN 1266862C
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Abstract
The present invention discloses a multiple frequency band subzone selecting system which comprises frequency band selecting parameters, a base station frequency band selecting unit and a movable station frequency band selecting unit, wherein the frequency band selecting parameters are positioned in a base station and are used for setting and maintaining each frequency band subzone; the base station frequency band selecting unit transmits the frequency band selecting parameters set by the base station; the movable station frequency band selecting unit is positioned in the movable station, is used for measuring and calculating the intensity indicating value of receiving signals of subzones with different frequency bands and the pilot channel carrier interference ratio, and is combined with the frequency band selecting parameters to determine the current switching subzone, wherein the frequency band selecting parameters set by the base station frequency band selecting unit are received by the movable station frequency band selecting unit. The present invention further discloses a multiple frequency band selecting method corresponding to the multiple frequency band subzone selecting system. The present invention is used so that the movable station is switched among the subzones with different frequency bands in a multiple frequency band CDMA system. Thus, a system operator can improve the system capacity and provide good-quality service for users.
Description
Technical field
The present invention relates to the multiband cell selecting technology of wireless communication system, be specifically related to a kind of multiband cell selection system and method that is applicable 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.At present in the gsm system of operation, usually use 900MHz/1800MHz double frequency handoff solution, wherein the 900MHz frequency range is used for whole network is carried out the wide area covering, 1800MHz is used for that hot zones is carried out the part and covers, absorbing the telephone traffic of network, the customer charge that the 900MHz frequency range that extensively covers is not carried is transferred on the 1800MHz frequency range and is born.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, can carry out Frequency Band Selection when just having started shooting such as the travelling carriage of mobile phone, just register cell selecting.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_txpwr_max_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.The priority level of the sub-district by 1800MHz is set to be higher than the sub-district of 900MHz like this, can be by the time to the setting guiding double frequency mobile platform started of priority the preferential sub-district of selecting 1800MHz, thereby realize the purpose of traffic guiding.
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 begun counting, its precision is a tdma frame (about 4.62 milliseconds), 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 1800M 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 owing to cdma system and gsm system because adopt different systems to have a lot of difference, therefore the Frequency Band Selection method of present gsm system directly can not be moved in the cdma system, these difference are in particular in:
1, carries out the flow process difference of sub-district primary election/sub-district gravity treatment.
Because cdma system adopts different standards with gsm system, so the flow process of the mode of the travelling carriage interception system message of cdma system and sub-district registration is all different with the travelling carriage of gsm system.
2, cell selecting key element difference.
Cdma system adopts different standards with gsm system, and gsm system is a time division multiplex system, and each user uses independently time slot, and therefore when selecting the different frequency range sub-district, whether enough user's demodulation get final product only need to consider the current area valid signal strengths.And cdma system is the self-interference system, and total interference of system is to influence the topmost factor of capacity, therefore, when selecting the sub-district of different frequency range, need take all factors into consideration the valid signal strengths and the carrier/interface ratio of district pilots.
3, number of frequency bands increases.
Present gsm system has only adopted the double frequency handover scheme, and it has only considered the switching of travelling carriage between two frequency ranges.And the cdma system resource of frequency range is abundant at present, the different choice that each country has each national frequency range to use, but generally all on single frequency band, run cdma system, never considered the idle technical scheme of switching (being cell selecting and sub-district gravity treatment) between a plurality of frequency ranges in standard and the agreement, along with sub-district providing to high data rate service, it is more and more nervous that the resource of frequency range will become, therefore, need more selection multiband between of consideration except two kinds of frequency ranges, the cdma system of multiband will become a kind of feasible scheme.If under the travelling carriage idle condition, can not select frequency range to carry out the traffic guiding, perhaps only consider between two frequency ranges and switch, along with further developing of cdma system network, will bring inevitable limitation.
Because cdma system does not use multiband, and the idle condition cell selecting of using in the cdma system is only considered same frequency range, this selection is initiatively carried out by travelling carriage at present.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.
Summary of the invention
In view of this, an object of the present invention is to provide the system that a kind of travelling carriage can be selected and switch between the multiband sub-district in the multiband cdma system.
Another object of the present invention provides the method for carrying out the multiband cell selecting based on above-mentioned multiband cell selection system.
Above-mentioned purpose of the present invention is achieved by the following technical solutions:
A kind of multiband cell selection system, comprise base station frequency band selected cell that is positioned at the base station and the travelling carriage Frequency Band Selection unit that is positioned at travelling carriage, wherein the base station frequency band selected cell comprises: be positioned at the Frequency Band Selection parameter maintenance unit of base station main control unit or baseband processing unit, be used to be provided with and safeguard the Frequency Band Selection parameter of each frequency range sub-district; Be positioned at the Frequency Band Selection control unit of base station baseband processing unit, be used to receive the set Frequency Band Selection parameter in Frequency Band Selection parameter maintenance unit, and encapsulate and send to travelling carriage; Travelling carriage Frequency Band Selection unit comprises: be positioned at the multiband pilot measurement unit of travelling carriage radio frequency part pilot measurement unit, be used for according to the pilot frequency intensity value and the received signal strength indicator value that receive from the Frequency Band Selection parameter measurement different frequency range sub-district of base station; Be positioned at the Frequency Band Selection control unit of travelling carriage baseband processing unit, the pilot frequency intensity value that is used for measuring according to described multiband pilot measurement unit is calculated the pilot channel carrier/interface ratio of different frequency range sub-district; Be positioned at the sub-district/frequency range decision unit of travelling carriage main control unit or baseband processing unit, be used for received signal strength indicator value of measuring through multiband pilot measurement unit and the pilot channel carrier/interface ratio of calculating through the Frequency Band Selection control unit, and determine current switching cell in conjunction with the Frequency Band Selection parameter according to the different frequency range sub-district.And the radio frequency unit of travelling carriage may further include the radio-frequency unit corresponding to system's number of frequency bands.
A kind of multiband cell selecting method based on above-mentioned multiband cell selection system comprises the steps:
A. will send to travelling carriage through Frequency Band Selection control unit encapsulation back from the base station by the predefined Frequency Band Selection parameter in base station;
B. the travelling carriage baseband processing unit is analyzed by the predefined Frequency Band Selection parameter in base station;
C. the pilot frequency intensity and the received signal strength indicator value of adjacent area measured in multiband pilot measurement unit according to the analysis result of step b;
D. the travelling carriage baseband processing unit calculates the carrier/interface ratio of adjacent area according to the pilot frequency intensity that step c measures;
E. sub-district/frequency range decision unit is determined current switching cell with received signal strength indicator value that obtains and carrier/interface ratio by predetermined multiband selection principle according to the Frequency Band Selection parameter that comprises the Frequency Band Selection parameter that is set in advance by the base station.
In above-mentioned multiband cell selecting method, can close on band information, frequency range priority, relative skew, the interim skew of access relatively, minimum thresholding and the minimum carrier/interface ratio that inserts of inserting of inserting by the sub-district in the base station sets Frequency Band Selection parameter; Also can be closed on band information, frequency range priority, be inserted skew and interim relative accesss skew relatively by the sub-district in the base station sets Frequency Band Selection parameter, the while inserts thresholding by minimum in the travelling carriage setting Frequency Band Selection parameter and the minimum carrier/interface ratio that inserts is the default value that is stored in the travelling carriage.
In above-mentioned multiband cell selecting method, multiband selection principle is to select the sub-district of carrier/interface ratio maximum to register under the situation of system's received signal intensity indication and the requirement of carrier/interface ratio parameter compliance with system at the travelling carriage that open state carries out sub-district primary election.And measure in step c multiband pilot measurement unit before the pilot frequency intensity and received signal strength indicator value of adjacent area, may further include the step of judging the travelling carriage current state, if travelling carriage is in open state, then multiband pilot measurement unit is measured at the highest sub-district of Mid Frequency priority, adjacent area; If travelling carriage is in idle condition, then multiband pilot measurement unit is measured at all adjacent areas.If if travelling carriage is in open state and do not have proper cell to satisfy system requirements at step e, then repeated execution of steps c measures at the sub-district that adjacent area Mid Frequency priority is taken second place, till a sub-district of having determined to meet the demands.
In above-mentioned multiband cell selecting method, multiband selection principle is to select the adjacent area of frequency range judgement reference value maximum to register under the situation of system's received signal intensity indication and the requirement of carrier/interface ratio parameter compliance with system at the travelling carriage that carries out the sub-district gravity treatment under the idle condition.The computational methods of its Mid Frequency judgement reference value are: 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 value is carrier/interface ratio and relative access skew sum.Wherein chronon is 1 at travelling carriage timer internal timing during the time less than predefined Frequency Band Selection thresholding, is being 0 during the time greater than the Frequency Band Selection thresholding, after travelling carriage is whenever finished once idle the switching, and this timer zero clearing.
In above-mentioned multiband cell selecting method, compliance with system requires to be meant that indication of received signal intensity and carrier/interface ratio are respectively greater than minimum thresholding and the minimum carrier/interface ratio that inserts of inserting in the Frequency Band Selection parameter.
By technical scheme of the present invention as can be seen, in the cdma system of multiband, the multiband selective system and the correlation method of the application of the invention, system operator can be allocated travelling carriage is selected different frequency range under beginning or idle condition sub-district by correct guidance, and then the balance resource, the purpose of realization System Expansion.System operator can improve the capacity of system by select using a plurality of frequency ranges like this, and provides better service for the user.
Simultaneously, the present invention is by suitably introducing the interim skew that inserts relatively in the Frequency Band Selection algorithm, avoided the switching of rattling between two sub-districts of user's travelling carriage, and the use cost of having saved user's travelling carriage has been optimized the utilization of whole Internet resources.
Description of drawings
Fig. 1 is the structural representation of multiband cell selection system of the present invention;
Fig. 2 is the flow chart of multiband system of selection among the present invention;
Fig. 3 A is an existing sub-district distributed architecture schematic diagram in the concrete Frequency Band Selection algorithm;
Fig. 3 B is a multifrequency sub-district overlay network structural representation in the concrete Frequency Band Selection algorithm;
Fig. 3 C is a multiband selection course schematic diagram in the concrete Frequency Band Selection algorithm.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Multiband cell selection system of the present invention comprises the base station frequency band selected cell that is positioned at the base station and is positioned at the travelling carriage Frequency Band Selection unit of travelling carriage that its structural representation as shown in Figure 1.In Fig. 1, travelling carriage Frequency Band Selection unit specifically comprises three logical blocks: be positioned at the pilot measurement unit multiband pilot measurement unit, be positioned at the sub-district/frequency range decision unit of main control unit and the Frequency Band Selection control unit that is positioned at baseband processing unit, and be provided with each frequency range radio-frequency unit RF1～RFn that uses corresponding to cdma system at travelling carriage.The base station frequency band selected cell specifically comprises two logical blocks: the Frequency Band Selection control unit and the Frequency Band Selection parameter maintenance unit that is positioned at main control unit that are positioned at baseband processing unit.Respectively they are elaborated below.
Radio-frequency unit RF1～RFn: radio-frequency unit RF1～RFn provides travelling carriage to search for the function of the pilot channel of a plurality of different frequency ranges sub-district, and radio frequency part is divided into RF1～RFn in logic, respectively the radio-frequency (RF) transmitter of corresponding different frequency range classifications.The n here represents the quantity of the frequency range of actual use, and for example cdma system has used five frequency ranges altogether, and travelling carriage radio frequency part RF1～RF5 also just correspondingly has the ability of handling five frequency ranges so.In Fig. 1, used corresponding to the radio-frequency unit of number of frequency bands and illustrated.
Multiband pilot measurement unit: the pilot frequency intensity that is used to measure a plurality of sub-districts, Frequency Band Selection information that provides according to the base station and the adjacent area list information in the system message, according to the difference of frequency range priority, successively pilot frequency intensity and received signal intensity indication (RSSI) measurement are carried out in the frequency range priority sub-district from high to low in the Neighboring Cell List.This function can increase in the pilot measurement unit of travelling carriage.
Sub-district/frequency range decision unit: the pilot channel measurement parameter of each frequency range sub-district that is used for providing based on many pilot measurements unit, and the Frequency Band Selection parameter of selecting the control unit sub-district to receive from base station frequency band, through taking all factors into consideration best up till now persistent district.This logic function can increase in existing main control unit.
Frequency Band Selection control unit: be used to calculate each district pilots channel carrier/interface ratio Ec/Io, and this parameter is sent to sub-district/frequency range decision unit, carry out the frequency range judgement for sub-district/frequency range decision unit.Simultaneously, according to frequency range/cell selecting result, reset the base band Control Parameter, and feed back to radio frequency unit, the control travelling carriage free time switches to new frequency range sub-district, registers in new frequency range sub-district.
Frequency Band Selection parameter maintenance unit: system operator can plan that situation and other network factors initiatively are provided with the Frequency Band Selection parameter of each frequency range sub-district according to current network, change along with factors such as the continuous development and change of network configuration and surrounding enviroment, the frequency range parameter that has been provided with is reset or adjusted, to meet current network condition, here provide corresponding maintenance console interface unit, to finish system operator conveniently is provided with the Frequency Band Selection parameter at maintenance console function.
The Frequency Band Selection control unit: the current Frequency Band Selection parameter that Frequency Band Selection parameter maintenance unit is obtained the periodically timed sending of encapsulation back of packing, carry out Frequency Band Selection for travelling carriage and use.
CDMA multiband selective system of the present invention has been described above, has the following describes and utilize this multiband selective system to carry out the method that multiband is selected.
Fig. 2 is the flow chart of multiband system of selection among the present invention.As shown in Figure 2, multiband system of selection of the present invention is made up of following steps.
Step S201: the Frequency Band Selection parameter maintenance unit of base station is provided with the Frequency Band Selection parameter at travelling carriage after the networking request that receives travelling carriage.The Frequency Band Selection parameter here mainly comprises sub-district/Frequency Band Selection parameter, and is as shown in table 1:
| Parameter name | Parameter declaration |
| Sub-district adjacent band information Neighbor_Band_Info | Which frequency range expression comprises in the adjacent area, offers travelling carriage as adjacent area pilot measurement foundation |
| Frequency range priority Band_Priority | All can receive the priority of frequency range at present in expression |
| The minimum thresholding Min_RSSI_Level that inserts | Travelling carriage can correctly receive the minimum threshold of base station information, is equivalent to the receiving sensitivity of travelling carriage here |
| The minimum Ec/Io Min_Ec/Io_Level that inserts | Travelling carriage is the minimum threshold of the carrier/interface ratio of demodulation base station information correctly |
| Insert skew Band_Offset relatively | Between each frequency range different inserted thresholdings is arranged, it represents can insert thresholding relatively between each frequency range |
| The interim skew Temp_Band_Offset that inserts relatively | For prevent the wireless environment comparing class like the time table tennis between the different frequency range switch, artificially formulate connecting at that time into threshold value |
Table 1
Frequency range priority in the table 1 can be by being provided with shown in the table 2:
| Value | Priority |
| 00 | Ban use of |
| 01 | Low |
| 10 | In |
| 11 | High |
Table 2
Here need to prove that minimum in the table 1 inserts thresholding and the minimum Ec/Io of access and also can can't help the base station and be provided with, and directly uses the default value that is stored in the travelling carriage.
At step S202, Frequency Band Selection parameter maintenance unit sends to the Frequency Band Selection control unit with the Frequency Band Selection parameter that is provided with.
At step S203, the Frequency Band Selection control unit together periodically sends to travelling carriage with these parameter packing encapsulation and other system message.
At step S204, after the radio-frequency unit of travelling carriage received system message from the base station, the system message that will comprise the Frequency Band Selection parameter sent to baseband processing unit.
At step S205, the system message that the baseband processing unit analysis is received, and the multiband message that comprises neighboring BS information etc. that analysis obtains sent to the pilot measurement unit, and will from system message, extract the sub-district/Frequency Band Selection parameter that obtains and send to sub-district/frequency range decision unit.
Because it is different to carry out the principle of sub-district gravity treatment when carrying out sub-district primary election and being positioned at idle condition when starting shooting in this enforcement, therefore will treat respectively in handling process.
At step S206, judge that the state of travelling carriage is in the open state of firm start or is in the idle condition of starting shooting but not communicating by letter at present.If travelling carriage is open state at present, then execution in step S207 and subsequent step; If travelling carriage is idle condition at present, then execution in step S213 and subsequent step.The deterministic process here is a prior art, does not repeat them here.
At step S207, after the Frequency Band Selection parameter of multiband pilot measurement unit reception from baseband processing unit, according to the adjacent area list information in Frequency Band Selection information and the system message,, pilot frequency intensity and rssi measurement are carried out in the sub-district that priority is the highest according to the frequency range priority in the Neighboring Cell List.Here it should be noted that if the identical sub-district of priority has a plurality ofly, then measure at these sub-districts respectively with identical limit priority.
At step S208, pilot frequency intensity and RSSI value that multiband pilot measurement unit measures previous step in rapid send to baseband processing unit.
At step S209, baseband processing unit calculation plot pilot channel carrier/interface ratio Ec/Io.
At step S210, baseband processing unit sends to sub-district/frequency range decision unit with the district pilots channel carrier/interface ratio Ec/Io value that calculates and the RSSI value of preceding planar survey.
At step S211, sub-district/frequency range decision unit is according to neighboring area signal intensity RSSI that receives and the value of pilot tone carrier/interface ratio Ec/Io, with the Frequency Band Selection parameter that receives, whether by predetermined Frequency Band Selection algorithm, determining has the sub-district that meets the demands in the at present measured sub-district.If the sub-district of measuring promptly meets the demands at present, then execution in step S218.Otherwise therefore show the sub-district that does not meet the demands in the highest sub-district of priority, also need to measure the sub-district that priority is taken second place, i.e. execution in step S212, and once more execution in step S208 to step S211.If the sub-district that meets the demands is arranged in the sub-district that priority is taken second place, execution in step S212 then, otherwise repeated execution of steps S208 is to step S211, till the sub-district of measuring meets the demands.The Frequency Band Selection algorithm here will describe in detail after a while.
If judge that at step S206 travelling carriage is in idle condition, then direct execution in step S213.
At step S213, after the Frequency Band Selection parameter of multiband pilot measurement unit reception from baseband processing unit,, pilot frequency intensity and rssi measurement are carried out in all adjacent areas according to the adjacent area list information in Frequency Band Selection information and the system message.
At step S214, pilot frequency intensity and RSSI value that multiband pilot measurement unit measures previous step in rapid send to baseband processing unit.
At step S215, baseband processing unit calculation plot pilot channel carrier/interface ratio Ec/Io.
At step S216, baseband processing unit sends to sub-district/frequency range decision unit with the district pilots channel carrier/interface ratio Ec/Io value that calculates and the RSSI value of preceding planar survey.
At step S217, sub-district/frequency range decision unit is according to the Cx value of predetermined each sub-district of Frequency Band Selection algorithm computation, sub-district, and definite present switching cell, is to select the maximum sub-district of Cx value as the target switching cell in the present embodiment.
At step S218, travelling carriage is according to the result of calculation of Frequency Band Selection algorithm, and registration or free time switch to this sub-district in Target cell, and this process is identical with idle handoff procedure of the prior art, does not repeat them here.In above-mentioned steps, the Frequency Band Selection algorithm of mentioning among step S211 and the step S217 can be determined according to actual conditions by system operator, be a kind of Frequency Band Selection algorithm of recommendation below.
As everyone knows, cell selecting comprises sub-district primary election and two kinds of situations of sub-district gravity treatment, initial Frequency Band Selection when inserting cdma network when sub-district primary election is mobile platform started, sub-district gravity treatment are to reselect the sub-district that comprises band information under the idle condition and register being positioned at after the mobile platform started.Owing to consider that mainly the turn-on time of travelling carriage can not be oversize during the primary election of sub-district, the sub-district gravity treatment is an optimized distribution of then mainly considering frequency range, and consider to avoid the appearance of ping-pong, therefore different to the concrete Frequency Band Selection algorithm of the situation of these two kinds of cell selecting, explanation respectively below:
1, sub-district primary election.
The principle of Frequency Band Selection is to select the highest sub-district of frequency range priority to register under RSSI of system and the Ec/Io parameter situation that all compliance with system requires during start.
Multiband pilot measurement unit closes on band information Neighbor_Band_Info and frequency range priority Band_Priority according to the sub-district that is received, the preferential pilot channel of measuring the highest adjacent area of frequency range priority, if the RSSI value of this pilot channel and Ec/Io value all satisfy the minimum requirements of system, then select the sub-district of Ec/Io maximum to register.That is to say, the priority level of possible two different frequency ranges is identical, if the minimum requirements that RSSI value that obtain at two or more sub-districts with different frequency range of equal priority this moment and Ec/Io value all satisfy system then selects the sub-district of Ec/Io maximum to register.Perhaps two or more sub-districts have similar frequency bands, so also will select the sub-district of Ec/Io maximum to register in these sub-districts.If RSSI and Ec/Io have the minimum requirement of the discontented pedal system of a parameter, the frequency range sub-district of then selecting frequency range priority to take second place is measured and is estimated, and the like.
For example, suppose that each frequency range classification has only a frequency in system, at first measure the highest adjacent area pilot channel RSSI of frequency range priority, if RSSI＞Min_RSSI_Level, measure this district pilots channel Ec/Io again, if during Ec/Io＞Min_Ec/Io_Level, select this frequency range sub-district to register.If RSSI＜Min_RSSI_Level or Ec/Io＜Min_Ec/Io_Level, the adjacent area of selecting frequency range priority to take second place is measured.And determine the sub-district according to the method described above, till having determined the sub-district that can register.
2, sub-district gravity treatment.
The principle of Frequency Band Selection is under the situation of compliance with system minimum requirements under the idle condition, selects the adjacent area of frequency range judgement reference value Cx maximum to register.Formula below the basis of Cx value:
Current persistent district:
Cx
o＝(Ec/Io)
o+(Band_Offset)
o+T×(Temp_Band_Offset)
o
Wherein T is the Frequency Band Selection timer, 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
Time_Aceeess_Level is the Frequency Band Selection thresholding time that is set in travelling carriage inside.
Other adjacent areas are as its pilot channel RSSI＞Min_RSSI_Level, during Ec/Io＞Min_Ec/Io_Level:
Cx
i＝(Ec/Io)
i+(Band_Offset)
i
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_Ec/Io_Level, and selection switches to the sub-district of Cx maximum in all frequency range sub-districts.
The same with prior art, 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.
Below by as shown in Figure 3 an example a concrete Frequency Band Selection computational process is described.Suppose that travelling carriage resides in the 800M sub-district at present, current measuring:
In the 800M grid (Ec/Io)
o=10, (Band_Offset)
o=10, T * (Temp_Band_Offset)
o=0, the Cx=10+10+0=20 in the 800M network so.
2.1G in the grid (Ec/Io)
i=8, (Band_Offset)
i=22, the Cx=8+22=30 in the 2.1G network so.
COMPREHENSIVE CALCULATING, the value of the Cx of 2.1G network are greater than the value of the Cx of 800M network, and therefore, mobile station in selecting switches in the 2.1G network.
The above-mentioned Frequency Band Selection algorithm of having introduced the present invention's recommendation considers that for difference different Frequency Band Selection algorithms can be arranged, as long as can realize the purpose of Frequency Band Selection in actual conditions.In addition, in an embodiment of the present invention, the Frequency Band Selection parameter maintenance unit of base station is arranged within the main control unit, and it also can be set directly within the baseband processing unit of base station in concrete the application; Simultaneously, the sub-district of travelling carriage/frequency range decision unit is positioned within the main control unit, and it also can be set directly within the baseband processing unit of travelling carriage in concrete the application.Those skilled in the art can know in addition, and the present invention is suitable for comprising any cdma system of cdma2000, WCDMA and TD-SCDMA.Therefore be appreciated that the foregoing description is the concrete introduction to spirit of the present invention, not in order to restriction the present invention.
Claims (12)
1. a multiband cell selection system is characterized in that, comprises base station frequency band selected cell that is positioned at the base station and the travelling carriage Frequency Band Selection unit that is positioned at travelling carriage, and described base station frequency band selected cell comprises:
Be positioned at the Frequency Band Selection parameter maintenance unit of base station main control unit or baseband processing unit, be used to be provided with and safeguard the Frequency Band Selection parameter of each frequency range sub-district; With
Be positioned at the Frequency Band Selection control unit of base station baseband processing unit, be used to receive the set Frequency Band Selection parameter in Frequency Band Selection parameter maintenance unit, and encapsulate and send to travelling carriage;
Described travelling carriage Frequency Band Selection unit comprises:
Be positioned at the multiband pilot measurement unit of travelling carriage radio frequency part pilot measurement unit, be used for according to the pilot frequency intensity value and the received signal strength indicator value that receive from the Frequency Band Selection parameter measurement different frequency range sub-district of base station;
Be positioned at the Frequency Band Selection control unit of travelling carriage baseband processing unit, the pilot frequency intensity value that is used for measuring according to described multiband pilot measurement unit is calculated the pilot channel carrier/interface ratio of different frequency range sub-district; With
Be positioned at the sub-district/frequency range decision unit of travelling carriage main control unit or baseband processing unit, be used for received signal strength indicator value of measuring through multiband pilot measurement unit and the pilot channel carrier/interface ratio of calculating through the Frequency Band Selection control unit, and determine current switching cell in conjunction with the Frequency Band Selection parameter according to the different frequency range sub-district.
2. multiband cell selection system according to claim 1 is characterized in that the radio frequency unit of described travelling carriage comprises the radio-frequency unit corresponding to system's number of frequency bands.
3. the multiband cell selecting method based on above-mentioned multiband cell selection system comprises the steps:
A. will send to travelling carriage through Frequency Band Selection control unit encapsulation back from the base station by the predefined Frequency Band Selection parameter in base station;
B. the travelling carriage baseband processing unit is analyzed described by the predefined Frequency Band Selection parameter in base station;
C. the pilot frequency intensity and the received signal strength indicator value of adjacent area measured in multiband pilot measurement unit according to the analysis result of step b;
D. the travelling carriage baseband processing unit calculates the carrier/interface ratio of adjacent area according to the pilot frequency intensity that step c measures;
E. sub-district/frequency range decision unit is determined current switching cell with received signal strength indicator value that obtains and carrier/interface ratio by predetermined multiband selection principle according to the Frequency Band Selection parameter that comprises the Frequency Band Selection parameter that is set in advance by the base station.
4. multiband cell selecting method according to claim 3, it is characterized in that, close on band information, frequency range priority, relative skew, the interim skew of access relatively, minimum thresholding and the minimum carrier/interface ratio that inserts of being pressed into of inserting by the sub-district in the described Frequency Band Selection parameter of base station sets.
5. multiband cell selecting method according to claim 3, it is characterized in that, closed on band information, frequency range priority, inserted skew and interim relative accesss skew relatively by the sub-district in the described Frequency Band Selection parameter of base station sets, the while inserts thresholding by minimum in the travelling carriage setting Frequency Band Selection parameter and the minimum carrier/interface ratio that inserts is the default value that is stored in the travelling carriage.
6. multiband cell selecting method according to claim 3, it is characterized in that, described multiband selection principle is to select the sub-district of carrier/interface ratio maximum to register under the situation of system's received signal intensity indication and the requirement of carrier/interface ratio parameter compliance with system at the travelling carriage that open state carries out sub-district primary election.
7. multiband cell selecting method according to claim 6, it is characterized in that, measure in step c multiband pilot measurement unit before the pilot frequency intensity and received signal strength indicator value of adjacent area, further comprise the step of judging the travelling carriage current state, if travelling carriage is in open state, then multiband pilot measurement unit is measured at the highest sub-district of Mid Frequency priority, adjacent area; If travelling carriage is in idle condition, then multiband pilot measurement unit is measured at all adjacent areas.
8. multiband cell selecting method according to claim 7, it is characterized in that, if travelling carriage is in open state, if and do not have proper cell to satisfy system requirements at step e, repeated execution of steps c then, measure at the sub-district that adjacent area Mid Frequency priority is taken second place, till a sub-district of having determined to meet the demands.
9. multiband cell selecting method according to claim 3, it is characterized in that, described multiband selection principle is to select the adjacent area of frequency range judgement reference value maximum to register under the situation of system's received signal intensity indication and the requirement of carrier/interface ratio parameter compliance with system at the travelling carriage that carries out the sub-district gravity treatment under the idle condition.
10. multiband cell selecting method according to claim 9, it is characterized in that, the computational methods of described frequency range judgement reference value are: 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.
11. multiband cell selecting method according to claim 10, it is characterized in that, described chronon is 1 at travelling carriage timer internal timing during the time less than predefined Frequency Band Selection thresholding, be 0 during the time greater than described Frequency Band Selection thresholding, after travelling carriage is whenever finished once idle the switching, described timer zero clearing.
12., it is characterized in that described compliance with system requires to be meant that indication of received signal intensity and carrier/interface ratio are respectively greater than minimum thresholding and the minimum carrier/interface ratio that inserts of inserting in the described Frequency Band Selection parameter according to claim 6 or 9 described multiband cell selecting methods.
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| JP4770146B2 (en) * | 2004-09-14 | 2011-09-14 | 日本電気株式会社 | Information processing apparatus and information processing method |
| US20060194610A1 (en) * | 2005-02-25 | 2006-08-31 | Mediatek Inc. | Band selection methods and related devices in a mobile communication system |
| EP1802152B1 (en) * | 2005-12-20 | 2009-05-27 | Nokia Siemens Networks Gmbh & Co. Kg | Call set-up in radio communication systems |
| CN101005324B (en) * | 2006-01-18 | 2010-07-14 | 中兴通讯股份有限公司 | System and method for searching frequency band information |
| CN100433929C (en) * | 2006-01-19 | 2008-11-12 | 华为技术有限公司 | Method for implementing service of wireless communication system |
| US7725106B2 (en) * | 2006-01-26 | 2010-05-25 | Qualcomm Incorporated | Methods, devices and systems relating to reselecting cells in a cellular wireless communications system |
| CN101677449A (en) * | 2008-09-19 | 2010-03-24 | 中兴通讯股份有限公司 | Cell reselecting method and terminal |
| CN101932078A (en) * | 2009-06-24 | 2010-12-29 | 鼎桥通信技术有限公司 | Selecting method of multiband TD-SCDMA system block |
| CN102111812B (en) * | 2009-12-24 | 2014-09-10 | 中兴通讯股份有限公司 | Method, equipment and system for allocating balanced access resources |
| CN102196511A (en) * | 2010-03-15 | 2011-09-21 | 中国移动通信集团公司 | Method, system and device for optimizing cell parameters |
| CN101951649B (en) * | 2010-07-20 | 2013-08-14 | 华为终端有限公司 | Method and terminal for switching base stations |
| CN109121169B (en) * | 2017-06-23 | 2021-04-13 | 中国移动通信有限公司研究院 | System information sending method, system information receiving method, base station and mobile communication terminal |
| CN107872821A (en) * | 2017-11-30 | 2018-04-03 | 广东欧珀移动通信有限公司 | The detection method and device of LTE network access result, computer-readable storage medium |
| CN110136823B (en) * | 2019-05-06 | 2020-05-19 | 江南大学 | Apparatus for wireless intelligent diagnosis of diabetic nephropathy and computer-readable storage medium |
| CN112994860B (en) * | 2019-12-18 | 2022-07-12 | 深圳市万普拉斯科技有限公司 | Frequency band path configuration method, device, terminal and storage medium |
| CN114430555B (en) * | 2020-10-29 | 2023-09-19 | 中国移动通信集团吉林有限公司 | Network capacity expansion method, electronic equipment and storage medium |
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