CN101076181B - Method for selecting access frequency point N frequency-point domain in TD-SCDMA system - Google Patents
Method for selecting access frequency point N frequency-point domain in TD-SCDMA system Download PDFInfo
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- CN101076181B CN101076181B CN200610081031XA CN200610081031A CN101076181B CN 101076181 B CN101076181 B CN 101076181B CN 200610081031X A CN200610081031X A CN 200610081031XA CN 200610081031 A CN200610081031 A CN 200610081031A CN 101076181 B CN101076181 B CN 101076181B
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Abstract
The method comprises: deciding if some frequency points whose load is lower than a preset frequency point exist in the cell; if yes, then allocates in priority the users to the frequency point in said frequency points with least residue code resources; if not, allocating user to the frequency point with least power or interference. When all frequency points are evenly distributed, allocating the low rate user to the frequency point with most unbalanced level of time slot, and allocating the high rate user to the frequency point with least unbalanced level of time slot; when the time slot load of each frequency point is evenly distributed, the low rate user is allocated to the frequency point with highest code channel fragments level, and the high rate user is allocated to the frequency point with least code channel fragment level.
Description
Technical field
The present invention relates to wireless communication system portable terminal access technology, relate in particular to a kind of access frequency point selection method of the TD-SCDMA N of system frequency point cell.
Background technology
In the TD-SCDMA system, the theoretical heap(ed) capacity of single subdistrict is the voice user of 23 CS12.2k, need satisfy the demand of capacity with regard to many cloth base station at the bigger hot zones of telephone traffic, need to introduce multi-transceiver technology, traditional multi-transceiver technology is made up of the identical alien-frequency district of a plurality of coverings, because the TD-SCDMA system is a time-division system,, then can cause Primary Common Control Physical Channel serious interference in the time slot zero if use traditional multi-transceiver technology.
In order to address this problem, Datang Mobile and Siemens organize the technology that proposes to use the N frequency in the 5th plenary session in the TD-SCDMA system in June, 2004 at CCSA TC5WG1.On September 13rd, 2004, overloading each large equipment manufacturer of technical specification frequently reached an agreement in the tenth meeting of WG1.The N frequency system that is different from other cdma systems for its characteristics of N frequency point cell of TD-SCDMA system.The N frequency point cell of TD-SCDMA system is divided into a main carrier frequency and several assistant carrier frequencies, all shared cover S-CCPCH, the PRACH of the UE on all carrier frequency, common signal channels such as DwPCH, PICH, and these common signal channels only are carried on the main carrier frequency.So in fact, all frequencies in N frequency point cell all belong to a sub-district, so the switching between frequency do not belong to the switching on the ordinary meaning, and can only belong to the category that cell re-configuration is put.After introducing N frequency technology, after UE resides in a frequency point cell, set up dedicated channel if desired, just relate at the N frequency point cell how to carry its business for UE selects a suitable frequency.
If introduce N frequency technology, then the capacity of sub-district then for being N times under single carrier frequency situation originally, has solved TD-SCDMA system cell capacity drawback less than normal in theory to a certain extent.But after introducing N frequency technology, behind subscriber access system, need to select suitable access frequency point for the user, improve the call completion ratio of system, reduce access delay, the alleviate congestion situation of calling out according to certain principle.
The cdma system of present other standards, for overloading frequency technology is that UE selects access frequency point based on a kind of strategy of load balancing mostly, but because the Capacity Ratio of the single frequency point of TD-SCDMA system own is less, better at wireless environment, when the N frequency point cell presents the resource-constrained feature of sign indicating number, if adopt balanced allocation strategy with user equilibrium be assigned on each carrier frequency, will cause the surplus resources of each carrier frequency all fewer after a period of time, and each carrier frequency all can't satisfy the service access of two-forty or the demand of the professional raising speed of PS, and this system that makes can't provide good support to the data business; On the other hand, if it is relatively poor at wireless environment, when the N frequency point cell presents power or interference-limited feature, if not guaranteeing the load balancing of each frequency distributes, higher frequency inserts if UE selects load, then increase the probability of access failure, caused the congested of whole N frequency point cell.
Therefore select and to combine with the mode of lack of balance by balanced way for the frequency of the N of TD-SCDMA system frequency point cell, use different technology in the different stages.Even based on the method for salary distribution of load balancing, modal method is that travelling carriage is selected a carrier frequency at random according to hash algorithm between a plurality of carrier frequency, and the balance between the overloading frequency is guaranteed by hash algorithm.Though this method can guarantee the load balancing on each carrier frequency on the long-time statistical meaning, but may appear in a period of time in a certain certain base station coverage most of travelling carriage and all select same carrier frequency by hash algorithm, thus cause load between carrier frequency the sub-district in unbalanced.
In addition, record accurate N frequency load equalization method from the base station and mainly contain, be assigned to the carrier frequency of using the OVSF channel number minimum newly calling out according to minimal chain way principle; Another kind is a minimum power expense principle, selects to take the minimum power carrier frequency and is assigned to new calling use.
And the unbalanced situation of load can occur between carrier frequency for the N of TD-SCDMA system frequency point cell but also have in the single carrier frequency the unbalanced situation of load between each time slot, and the ovsf code resource of the single carrier frequency of TD-SCDMA system is less, and also having the restriction of user maximum channel number in a time slot for up direction, the code channel fragment in the ovsf code tree can greatly influence the available capacity of system.Therefore, need be at the more reasonable load balancing strategy between carrier frequency more targetedly of these characteristics design of the N frequency point cell of TD-SCDMA system.
Summary of the invention
Main purpose of the present invention is to provide a kind of access frequency point selection method of the TD-SCDMA of the being used for N of system frequency point cell, is used to overcome the high speed business that limitation and defective owing to prior art cause and supports problems such as limited and the increase of access failure probability.
To achieve these goals, according to a first aspect of the invention, the invention provides a kind of access frequency point selection method of the TD-SCDMA of the being used for N of system frequency point cell.Access frequency point selection method may further comprise the steps: determining step, judge the frequency that whether exists the frequency load to be lower than preset value in the sub-district, and if exist, then carry out the lack of balance allocation step, if there is no, then carry out balanced allocation step; The lack of balance allocation step preferentially is dispensed to the user the minimum frequency of residue code channel resource in all frequencies that the frequency load is lower than preset value; Balanced allocation step preferentially is dispensed to the user power or disturbs minimum frequency.
In the sub-district, do not exist the frequency load to be lower than the frequency of preset value, and when the frequency Load distribution of each frequency is balanced, if there is the unbalanced frequency of Load distribution between time slot, then preferentially low speed user is dispensed to the highest frequency of time-slot load inequality extent, the highspeed user is dispensed to the minimum frequency of time-slot load inequality extent.
In the sub-district, do not exist the frequency load to be lower than the frequency of preset value, and when the frequency Load distribution of each frequency is balanced, if Load distribution equilibrium between the time slot of all frequencies, then preferentially low speed user is dispensed to the highest frequency of code channel fragment degree, the highspeed user is dispensed to the minimum frequency of code channel fragment degree.
In the sub-district, exist the frequency load to be lower than the frequency of preset value, and frequency load is lower than the frequency Load distribution of each frequency of preset value when balanced, if each frequency residue code channel number of resources distributing equilibrium, then preferentially low speed user is dispensed to the highest frequency of code channel fragment degree, the highspeed user is dispensed to the minimum frequency of code channel fragment degree.
When all frequencies all transshipped in the sub-district, the portable terminal that is in idle condition by the system broadcast message restriction carried out cell selecting and gravity treatment to current area.
For the access request of switching the user, the preferential selection frequency different with cell-of-origin user job frequency inserts.
To achieve these goals, according to a second aspect of the invention, the invention provides a kind of access frequency point selection method of the TD-SCDMA of the being used for N of system frequency point cell.When the frequency Load distribution of each frequency in the sub-district is balanced, if there is the unbalanced frequency of Load distribution between time slot, then preferentially low speed user is dispensed to the highest frequency of time-slot load inequality extent, the highspeed user is dispensed to the minimum frequency of time-slot load inequality extent.
To achieve these goals, according to a third aspect of the invention we, the invention provides a kind of access frequency point selection method of the TD-SCDMA of the being used for N of system frequency point cell.When the frequency Load distribution of each frequency in the sub-district is balanced,, the highspeed user is dispensed to the minimum frequency of code channel fragment degree if Load distribution equilibrium between the time slot of all frequencies then preferentially is dispensed to the highest frequency of code channel fragment degree with low speed user.
By technique scheme, the present invention has realized following technique effect.The present invention can be that UE selects best access frequency point according to different frequency selection strategies according to the wireless network environment self adaptation, raising system call completion ratio, enhanced system is to the support of high-speed data service, load between each time slot in effective each carrier frequency of balance of energy, and the probability that reduces code channel fragment appearance in each carrier frequency simultaneously.Because the integrated operation of load balancing operation and time slot internal fragment code channel all is extremely complicated systematic procedure between time slot, and by reducing the frequency that calls of these complication system processes after use this method greatly.Therefore, use this method to have the raising power system capacity, cover and efficient, reduced, improve handover success rate effectively with the frequency switch instances.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the access frequency point selection method of the TD-SCDMA N of system frequency point cell of the present invention;
Fig. 2 is three ascending time slot code tree schematic diagrames in the TD-SCDMA system;
Fig. 3 is the overall flow figure according to the embodiment of the invention;
Fig. 4 is according to the total candidate carrier frequencies aggregation process of the structure of embodiment of the invention sub-process figure;
Fig. 5 is the phase I frequency selection course sub-process figure according to the embodiment of the invention; And
Fig. 6 is the second stage frequency selection course sub-process figure according to the embodiment of the invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
With reference to Fig. 1, may further comprise the steps according to the access frequency point selection method of the TD-SCDMA N of system frequency point cell of the present invention:
S202 judges the frequency that whether exists the frequency load to be lower than preset value in the sub-district, if exist, then carries out S204, if there is no, then carries out S206;
S204 preferentially is dispensed to the user the minimum frequency of residue code channel resource in all frequencies that the frequency load is lower than preset value;
S206 preferentially is dispensed to the user power or disturbs minimum frequency.
The technical problem to be solved in the present invention is to provide a kind of TD SDMA that is applicable to insert the frequency selection algorithm of N frequency point cell in (TD-SCDMA) system, when dedicated channel resource is set up in the travelling carriage application, for only carrier frequency of mobile station in selecting carries its dedicated channel resource, the access frequency point selection strategy that the present invention proposes is divided into two stages.
Phase I: in the N frequency point cell, have the not high frequency of some loads (frequency is loaded to be lower than and pre-seted thresholding), can think that then these frequencies temporarily also do not present power and interference-limited trend, only present the resource-constrained radio characteristics of sign indicating number, for example, inter-frequency networking or user distribution are balanced and nearer from the base station.Because TD-SCDMA system single frequency point finite capacity, if the user is dispersed in each frequency in the N frequency point cell, then may cause the residue RU resource of each frequency can't satisfy the demand that single high speed business inserts, but the total residue RU resource of all frequencies of N frequency point cell is to satisfy the high speed business demand.Therefore,, adopt the lack of balance allocation strategy, under the prerequisite that resource satisfies the demands, preferentially the user is dispensed to the minimum carrier frequency of residue RU resource if when the frequency in the N frequency point cell only presents the resource-constrained radio characteristics of sign indicating number.When the frequency Load distribution of each frequency is balanced,, the highspeed user is dispensed to the minimum frequency of code channel fragment degree if each frequency residue code channel number of resources distributing equilibrium then preferentially is dispensed to the highest frequency of code channel fragment degree with low speed user.
Second stage: when the load of all carrier frequency in the N frequency point cell all acquires a certain degree (the frequency load is higher than the thresholding that pre-sets), think that then all frequencies current all presenting disturb or the radio characteristics of power limited, for example, identical networking or user distribution are unbalanced or far away from the base station, adopt balanced allocation strategy, under the prerequisite that resource satisfies the demands, preferentially the user is dispensed to power or disturbs minimum carrier frequency to keep load balancing between each carrier frequency, and under the relatively balanced situation of each frequency Load distribution, then further consider time-slot load distribution situation in each frequency, in fact often can in single time slot or two time slots, insert for low rate traffic, situation about being more or less the same at the load of each carrier frequency allows the unbalanced frequency of low speed service access time-slot load as paying the utmost attention to, so according to the operation principle of DCA, can allow the professional preferential the lightest time slot of access frequency point internal loading, admit this user to be difficult for causing that the load of time slot surpasses the admittance thresholding on the one hand, play the load effect of each time slot of balance on the other hand to a certain extent, thereby reduced the frequency of calling of time-slot load equalization operation, improved the efficient of system.If time-slot load distributes also relatively more balanced in each frequency, then can further consider code channel fragment degree in each frequency, its needs take the bigger code channel of spreading factor for low speed is professional, be fit to it is dispensed to the higher frequency of code channel fragment degree, can reserve how continuous code channel resource for later high speed business; And high speed business need take the spreading factor code channel, is fit to that it is dispensed to the lower frequency of code channel fragment degree and reaches raising access success rate.
Main innovation part of the present invention be following some:
1. the lack of balance allocation strategy combines with balanced allocation strategy is effective, can select to use different strategies according to current wireless environment self-adaption ground in real time.When system only presents the resource-constrained radio characteristics of sign indicating number, adopt the lack of balance allocation strategy, improve of the support of N frequency point cell to high speed business; And disturb or during power limited dangerous, adopt balanced allocation strategy when system presents, guarantee that user priority selects to load underloading frequently, reduce the call failure probability.
2. select to adopt to have introduced under the balanced allocation strategy prerequisite in system and more preferably select strategy one: based on the principle of balanced time-slot load.Promptly load and be more or less the same when each frequency of N frequency point cell, but there is Load distribution inequality between the time slot of some frequencies, then with the low speed user priority allocation to the highest frequency of time-slot load inequality extent, and with highspeed user's priority allocation to the minimum frequency of time-slot load inequality extent.
3. select to adopt to have introduced under the balanced allocation strategy prerequisite in system and more preferably select strategy two: based on the principle of filling the code channel fragment.Promptly be more or less the same when each frequency of N frequency point cell load, and each frequency time-slot load distribute balanced, then with the low speed user priority allocation to the highest carrier frequency of code channel fragment degree, with highspeed user's priority allocation to the minimum carrier frequency of code channel fragment degree.
4. when all carrier frequency all transshipped in the N frequency point cell, the UE that is in the IDLE state by the system broadcast message restriction carried out cell selecting and gravity treatment to current N frequency point cell.
5. for the access request of switching the user, the preferential selection frequency different with cell-of-origin user job carrier frequency inserts, and under the situation that does not have other available carrier frequencies resources, just considers to select the frequency identical with cell-of-origin user job carrier frequency to insert.
Several individual callings are defined as follows among the present invention:
1. the effective RU (Resource Unit) in the up direction carrier frequency counts: the up direction unique user can distribute two different channels (ovsf code) at most in the TD-SCDMA system in a time slot, and the RU number that two code channels of spreading factor minimum can carry in the current time slots is the maximum load-carrying capacity that provides for unique user in this time slot.If have a plurality of ascending time slots the carrier frequency in the N frequency point cell, then the effective RU number of up direction is that the effective RU of each ascending time slot counts sum.
2. the dispersion ratio of code channel: 1-(residue RU sum in the interior effectively RU number/up direction list carrier frequency of the single carrier frequency of up direction) in the up direction carrier frequency shows that then the code channel fragment is many more in interior each ascending time slot of this carrier frequency if dispersion ratio is high more; Otherwise the code channel fragment is few, and the utilance height of code channel more helps admitting the business of big speed.
Fig. 2 is three ascending time slot code tree schematic diagrames in the TD-SCDMA system, white portion is represented the idle code channel that gets among the figure, black part divides expression by the code channel of CU, and the gray shade part is represented then that its descendants's code channel or ancestors' code channel are occupied and caused it to get clogged.As can be seen from the figure, as can be seen from the figure, the total residue RU number of time slot 1 this code tree is 9, and the basic RU number that two code channels that effective RU is a minimal frequency spreading factor can carry is 4+2=6 not; Time slot 2 total surplus RU numbers are 12, and effectively remaining the RU number is 6; Time slot 3 total residue RU numbers are 10, and effectively remaining the RU number also is 10; Then the interior code channel of the up direction carrier frequency of this frequency up direction is discrete
3. time-slot load is poor in the carrier frequency: (up/descending) time-slot load difference is meant (up/descending) time slot and the load difference of loading between minimum (up/descending) time slot that the carrier frequency internal loading is the highest in the carrier frequency.
4. carrier frequency is loaded: the load of a carrier frequency is meant the mean value of each (up/descending) time-slot load in this frequency in the N frequency point cell of TD-SCDMA system.
Need to prove that in the TD-SCDMA system basic RU represents that a spreading factor is the capacity of 16 code channel.
In addition, frequency is selected the frequency load of foundation in the present invention, time slot symbol lotus, and information such as residue RU number can be the relevant informations of up direction, also can be the relevant informations of down direction, but simultaneously can only be according to the information of a direction.
The present invention includes following steps, as shown in Figure 3:
A. obtain and call out relevant information, comprise RAB, UE supports multi-carrier frequency ability information, and type of call etc. empty and insert the candidate carrier frequencies set.
B. obtain the load condition sign of main carrier frequency and each assistant carrier frequency, the load condition of each time slot in the carrier frequency, the ovsf code tree dispersion ratio information of total surplus RU resource and up direction.
C. according to calling out relevant information and each frequency information on load, make up total candidate carrier frequencies set that the user can insert.
If D. total candidate carrier frequencies set then enters step e for empty; Otherwise, enter step F.
E. judge whether that all carrier frequency all are in overload? if, return admission reject simultaneously by revising the relevant information restriction UE cell selecting gravity treatment in the system broadcast message 3.Otherwise, directly return admission reject.
F. the load of each frequency in total candidate carrier frequencies set is lower than the frequency adding phase I candidate carrier frequencies set of the phase I candidate carrier frequencies load thresholding that pre-sets.
G. do you judge that phase I candidate carrier frequencies set is for empty? if be not sky then enter step H; Otherwise, enter step I.
H. enter phase I frequency selection course.
I. enter second stage frequency selection course.
In step C, comprise following 6 steps:
C1. judge whether UE supports the N frequency,, then enter step C2 if do not support; Otherwise, enter step C3.
C2. judge whether that main carrier frequency traffic overload or main carrier frequency residue RU resource does not satisfy the resource requirement of calling out? if then main carrier frequency is added in total candidate carrier frequencies set; Otherwise total candidate carrier frequencies set is constant.
C3. with all load nonoverloads, and the carrier frequency that uplink and downlink direction residue RU number can both satisfy the call resources demand adds in total candidate carrier frequencies set.
C4. do you judge that this user is new the calling or the switching user? if switch the user, then enter step C5; Otherwise, keep total candidate carrier frequencies set constant.
C5. do you judge and exist in the candidate carrier frequencies set and the identical carrier frequency of the switching former cell frequency in user place? if no, then keep time always to select the carrier frequency set constant; Otherwise, enter step C6.
C6. judge to wait the carrier frequency number that always selects in the carrier frequency set greater than 1? if then there is the carrier frequency of same frequency deletion and the former sub-district of switching user; Otherwise, keep waiting and always select the carrier frequency set constant.
In step H, comprise following 3 steps:
H1. do you judge whether the carrier frequency number in the phase I candidate carrier frequencies set unique? if directly export this carrier frequency; Otherwise, enter step H2.
H2. judge the phase I candidate carrier frequencies gather the residue RU number of the up direction of each carrier frequency or down direction distribute whether balanced, if then enter step H3; Otherwise, export the access carrier sequence from few to big order according to residue RU number.
H3. whether judge the RU demand that inserts the user uplink direction greater than the RU thresholding 1 that pre-sets, if, then according to code channel dispersion ratio order output access frequency point sequence from small to large; Otherwise, according to code channel dispersion ratio order output access frequency point sequence from big to small.
Comprise following 4 steps among the step I:
Whether the load of I1. judging the carrier frequency upstream or downstream direction in the set of total candidate carrier frequencies distributing equilibrium? if then enter step I2; Otherwise, according to each carrier frequency load order output access frequency point sequence from small to large.
I2. do you judge whether balanced the interior time-slot load of each carrier frequency distributes in total candidate carrier frequencies set? if then enter step I4; Otherwise, enter step I3;
I3. do you judge that the RU demand of the up/down direction that inserts the user is greater than the high speed business RU demand thresholding that pre-sets? if greater than, then export the access carrier sequence according to the time-slot load difference order from small to large of each frequency; Otherwise, according to each frequency time-slot load difference order output access carrier sequence from big to small;
I4. whether judge the RU demand that inserts the user uplink direction greater than the RU thresholding that pre-sets, if, then according to code channel dispersion ratio order output access frequency point sequence from small to large; Otherwise, according to dispersion ratio order output access frequency point sequence from big to small.
With reference to Fig. 3 to Fig. 6, concrete implementation step of the present invention is as follows:
Step 101:RNC obtains the relevant information of calling, comprises the UE ability information, resource requirement information, and type of call is if the words of switch call also need obtain the former cell frequency information at UE place.
Step 102: obtain the load of each time slot in main carrier frequency and each assistant carrier frequency load condition sign and the carrier frequency, on, the code channel dispersion ratio information of descending residue RU resource and up direction.
Step 103: judge that UE supports the N frequency? if do not support, then enter step 104; Otherwise, enter step 105.
Step 104: judge whether that the traffic overload of main carrier frequency or main carrier frequency residue RU resource do not satisfy the resource requirement of calling out? if then main carrier frequency is added in total candidate carrier frequencies set; Otherwise total candidate carrier frequencies set is constant.
Step 105: on all, the downlink load nonoverload, and on, the carrier frequency that descending residue RU number can satisfy the call resources demand adds in total candidate carrier frequencies set.
Step 106: judge that this user is new the calling or the switching user? if switch the user, then enter step 107; Otherwise, keep the candidate carrier frequencies set constant.
Step 107: judge to exist in the candidate carrier frequencies set and the identical carrier frequency of the switching former cell frequency in user place? if no, then keep always selecting the carrier frequency set constant; Otherwise, enter step 108.
Step 108: judge whether the carrier frequency number in the candidate carrier frequencies set unique? if keep total candidate carrier frequencies set constant; Otherwise there is the carrier frequency of same frequency deletion and the former sub-district of switching user.
Step 109: judge that total candidate carrier frequencies set is empty? if be empty, then enter step 110; Otherwise enter step 111.
Is step 110: what judge whether all carrier frequency all in overload? if, then revise the cell Cell Access Restriction (restriction is inserted in the sub-district) in the system broadcast message 3, cell " Cell Status (cell status) " is changed to barred (obstruction), cell " Intra-frequency Cell-Reselection Indicatior (co-frequency cell gravity treatment indication) " is set to allow (permission), notify all UE current area states that are in idle pulley for blocking by system broadcast message 3, UE can not select and gravity treatment current area in a period of time like this, returned refusal simultaneously and inserted; Otherwise, directly return refusal and insert.
Step 111: judge whether carrier frequency unique in total candidate carrier frequencies set? if then indicate UE to insert this carrier frequency; Otherwise, enter step 112.
Step 112: direction carrier frequency in total candidate carrier frequencies set is loaded in the carrier frequency adding phase I candidate carrier frequencies set of the phase I candidate carrier frequencies load thresholding that pre-sets.
Step 113: judge that the phase I candidate carrier frequencies is empty? if be empty, then enter step 117; Otherwise enter step 114.
Step 114: judge whether the carrier frequency number unique in the phase I candidate carrier frequencies set? if then indicate UE to insert this carrier frequency; Otherwise, enter step 115.
Is step 115: the difference of judging the residue RU number between residue RU number is maximum in the phase I candidate carrier frequencies set the carrier frequency carrier frequency minimum with remaining the RU number counted thresholding less than the residue RU that pre-sets? if then enter step 116; Otherwise, export the carrier frequency sequence that can insert according to residue RU number order from small to large.
Step 116: judge current calling in the RU of up direction demand greater than the professional RU demand of the low speed that pre-sets thresholding? if then carrier frequency in the phase I candidate carrier frequencies set is exported the carrier frequency sequence that can insert according to code channel dispersion ratio order from low to high; Otherwise, export the carrier frequency sequence that can insert according to code channel dispersion ratio order from high to low.
Step 117: calculate load in the set of total candidate carrier frequencies high carrier frequency and the carrier frequency load difference of loading between the minimum carrier frequency.
Does step 118: whether the carrier frequency load difference of calculating in the determining step 117 surpass the carrier frequency load difference thresholding that pre-sets? if, then according to carrier frequency load order output access carrier sequence from low to high; Otherwise, enter step 119.
Step 119: the time-slot load that calculates each carrier frequency in total candidate carrier frequencies is poor.
Step 120: judge to have the time-slot load difference of maximum time-slot load difference carrier frequency greater than pre-seting time-slot load difference thresholding? if then enter step 121; Otherwise, enter step 122;
Step 121: judge and call out in the RU of upstream or downstream direction demand less than pre-seting high speed business RU demand thresholding? if, then according to time-slot load difference order output access carrier sequence from big to small.Otherwise, according to time-slot load difference order output access carrier sequence from small to large.
Step 122: judge current calling in the RU of up direction demand greater than the professional RU demand of the low speed that pre-sets thresholding? if then element in the phase I candidate carrier frequencies set is exported the carrier frequency sequence that can insert according to code channel dispersion ratio order from low to high; Otherwise, export the carrier frequency sequence that can insert according to code channel dispersion ratio order from high to low.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the access frequency point selection method of the N of a TD-SCDMA system frequency point cell is characterized in that, may further comprise the steps:
Determining step is judged the frequency that whether exists the frequency load to be lower than preset value in the described sub-district, if exist, then carries out the lack of balance allocation step, if there is no, then carries out balanced allocation step;
The lack of balance allocation step preferentially is dispensed to the user the minimum frequency of residue code channel resource in all frequencies that the frequency load is lower than preset value;
Balanced allocation step preferentially is dispensed to the user power or disturbs minimum frequency.
2. access frequency point selection method according to claim 1, it is characterized in that, in described sub-district, do not exist the frequency load to be lower than the frequency of preset value, and when the frequency Load distribution of each frequency is balanced, if there is the unbalanced frequency of Load distribution between time slot, then preferentially low speed user is dispensed to the highest frequency of time-slot load inequality extent, the highspeed user is dispensed to the minimum frequency of time-slot load inequality extent.
3. access frequency point selection method according to claim 1, it is characterized in that, in described sub-district, do not exist the frequency load to be lower than the frequency of preset value, and when the frequency Load distribution of each frequency is balanced, if Load distribution equilibrium between the time slot of all frequencies, then preferentially low speed user is dispensed to the highest frequency of code channel fragment degree, the highspeed user is dispensed to the minimum frequency of code channel fragment degree.
4. access frequency point selection method according to claim 1, it is characterized in that, in described sub-district, exist the frequency load to be lower than the frequency of preset value, and frequency load is lower than the frequency Load distribution of each frequency of preset value when balanced, if each frequency residue code channel number of resources distributing equilibrium, then preferentially low speed user is dispensed to the highest frequency of code channel fragment degree, the highspeed user is dispensed to the minimum frequency of code channel fragment degree.
5. access frequency point selection method according to claim 1 is characterized in that, when all frequencies all transshipped in the described sub-district, the portable terminal that is in idle condition by the system broadcast message restriction carried out cell selecting and gravity treatment to current area.
6. access frequency point selection method according to claim 1 is characterized in that, for the access request of switching the user, the preferential selection frequency different with cell-of-origin user job frequency inserts.
7. the access frequency point selection method of the N of a TD-SCDMA system frequency point cell, it is characterized in that, when the frequency Load distribution of each frequency in the described sub-district is balanced, if there is the unbalanced frequency of Load distribution between time slot, then preferentially low speed user is dispensed to the highest frequency of time-slot load inequality extent, the highspeed user is dispensed to the minimum frequency of time-slot load inequality extent.
8. the access frequency point selection method of the N of a TD-SCDMA system frequency point cell, it is characterized in that, when the frequency Load distribution of each frequency in the described sub-district is balanced, if Load distribution equilibrium between the time slot of all frequencies, then preferentially low speed user is dispensed to the highest frequency of code channel fragment degree, the highspeed user is dispensed to the minimum frequency of code channel fragment degree.
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| CN101730240B (en) * | 2008-10-14 | 2012-01-04 | 鼎桥通信技术有限公司 | Method for selecting access carrier of N-frequency point cell |
| CN101742599B (en) * | 2008-11-27 | 2014-08-13 | 华为技术有限公司 | Method, device and system for selecting target cell |
| CN101801030B (en) * | 2009-02-05 | 2012-11-14 | 电信科学技术研究院 | Method, device and system for realizing load balancing |
| CN102264133B (en) * | 2010-05-31 | 2014-09-24 | 鼎桥通信技术有限公司 | Resource distribution method |
| WO2012159354A1 (en) * | 2011-07-29 | 2012-11-29 | 华为技术有限公司 | Hard assignment method and radio access network device |
| CN103747488B (en) * | 2014-01-28 | 2017-02-22 | 大唐移动通信设备有限公司 | carrier balancing method, device and system |
| CN103813347B (en) | 2014-02-28 | 2018-01-26 | 电信科学技术研究院 | A kind of base station frequency resource allocation method and the network equipment |
| CN106535232B (en) * | 2016-12-16 | 2019-11-19 | 京信通信系统（中国）有限公司 | A kind of frequency point optimization method and device |
| CN109819482B (en) * | 2017-11-21 | 2020-08-25 | 大唐移动通信设备有限公司 | Data processing method and device |
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