CN1564495A - Load balancing method in system of broad band CDMA - Google Patents
Load balancing method in system of broad band CDMA Download PDFInfo
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- CN1564495A CN1564495A CN 200410029830 CN200410029830A CN1564495A CN 1564495 A CN1564495 A CN 1564495A CN 200410029830 CN200410029830 CN 200410029830 CN 200410029830 A CN200410029830 A CN 200410029830A CN 1564495 A CN1564495 A CN 1564495A
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Abstract
The method includes steps: RNC obtains measured values of reflecting load condition from base stations in sub zones in same coverage and in different frequencies; after receiving message from CN of building wireless access bearing power for UE, comparing loads among current sub zone with sub zones in same coverage and in different frequencies; based on preset condition for even loading, selecting a target sub zone for UE; after accepting action of the target sub zone, command of building wireless access bearing power with envelop open and resources information of the target sub zone being carried are sent to UE; after completing wireless bearing, UE returns the information. The invention ensures that UE switches to sub zone with lower load in same coverage earlier in order to realize balanced load.
Description
Technical field
The present invention relates to a kind of load equalization method in Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access is hereinafter to be referred as the WCDMA) system, particularly to load equalization method between the frequency that covers alien-frequency district together.
Background technology
Extensive use and fast development along with mobile communcations system, a lot of key technologies in the mobile system also are gradually improved, when realizing user's proper communication, also must consider how to obtain best performance, make system and subscriber equipment can both obtain gratifying effect, from the angle of system, wish to insert as far as possible more user.
The WCDMA system has compared many special characters with other system (as gsm system and cdma system), and soft capacity, support variable Rate business are the big features of one.In the WCDMA system, subscriber equipment (User Equipment, hereinafter to be referred as UE) in the process that moves, residing wireless environment is engraved in when being and is changing, when UE degenerates away from base station or wireless environment, if still keep original speed rates, in order to guarantee its service quality QoS (Quality of Service), under the effect of closed power control, the base station will inevitably send signal with bigger power, and the capacity of system also can change thereupon.If can make UE receive service by adequate measure in proper cell, for system, on the one hand power system capacity is utilized fully, guarantee the smooth access of follow-up UE, for the user, also can obtain relative good quality of service on the other hand.
For the zone of adopting with the alien-frequency district that covers, a plurality ofly constituted the total capacity that should the zone can reach with the capacity sums that cover different carrier cell, the equilibrium of load between how carrying out frequently realizes the overloading maximization of regional capacity frequently, is a problem that is worth research.
There is not specific implementation method in the prior art standard at the equilibrium of WCDMA system loading.In number of patent application is 00127302.7 Chinese patent application, " the pretreated method of load balance in a kind of mobile communication system " disclosed, this method is in mobile communication system, by measuring the load condition of adjacent each sub-district, revise system information parameters, promptly control the parameter that the user selects the sub-district, reach the guiding user and in the relatively low sub-district of load, insert.But, the technical scheme that load balancing is carried out in this patent application can only be used for the processing of co-frequency cell, at be the potential user of connecting system not as yet, do not have explanation to specifically how handling, not at the user's of connecting system processing method with the situation that covers alien-frequency district yet.
Summary of the invention
The technical problem to be solved in the present invention provides the load equalization method in a kind of broadband CDMA system, when business is set up, can carry out the equilibrium of load between frequency with the load that covers alien-frequency district based on each.
In order to solve the problems of the technologies described above, the invention provides the load equalization method in a kind of broadband CDMA system, may further comprise the steps:
(a) radio network controller obtains the measured value of each cell load situation of reflection from each with the base station that covers alien-frequency district;
(b) radio network controller receives after core net sets up message to the RAB of subscriber equipment, and relatively current area and its are with the load that covers alien-frequency district, and the load balancing switching condition in conjunction with setting is described subscriber equipment selected target sub-district;
(c) admit action at described Target cell, send radio bearer to described subscriber equipment after finishing and set up order, carry the information of Target cell and the information of Resources allocation;
(d) after the radio bearer of described user equipment side foundation action is finished, in Target cell, return radio bearer foundation and finish message.
Said method can have following characteristics: described step (a) further can may further comprise the steps:
Described radio network controller sends sub-district public-measurement control command with the base station that covers alien-frequency district to each, comprises the measuring amount of setting and the parameter relevant with reporting mode;
Described base station is measured after receiving described public-measurement control command as requested, when satisfying report condition, to described radio network controller reporting measurement result;
The measurement result that described radio network controller storage base station reports, supply and demand will the time use.
Said method can have following characteristics: described measured value perhaps is the emission carrier power for receiving total wideband power, perhaps for receiving total wideband power and emission carrier power.
Said method can have following characteristics: described base station is that periodic report mode or Event triggered report mode to the mode of radio network controller reporting measurement value.
Said method can have following characteristics: in the described step (b), radio network controller further may further comprise the steps according to the process of cell load select target sub-district:
(b1) described each load condition with the covering alien-frequency district of radio network controller inquiry judges whether to exist load to be lower than the same covering alien-frequency district of current area load, if exist, carries out next step, otherwise, execution in step (b3);
(b2) will load lower same covering alien-frequency district as setting up professional Target cell, execution in step (c);
(b3) with the Target cell of current area as the foundation business, execution in step (c).
For fear of the frequent equilibrium treatment that may occur, effectively reduce the possibility of the call drop that causes owing to direct-cut operation between taking place frequently, in the process of above-mentioned radio network controller according to cell load select target sub-district, described step (b1) can further comprise step before: judge whether the current area load is lower than default threshold value, if, execution in step (b3), otherwise execution in step (b1).
For fear of the frequent equilibrium treatment that may occur, safeguard the service quality of current accessed user's equipment to greatest extent, in the said method, can further comprise step after the described step (b1): judge that the current area load exceeds it and whether reaches default sluggish thresholding with the difference that covers the alien-frequency district load, if, execution in step (b2), otherwise execution in step (b3).
Said method can have following characteristics: when carrying out the comparison of minizone load, only receive the comparison of total wideband power or emission carrier power, perhaps to receiving total wideband power and launching carrier power and comprehensively compare.
Said method can have following characteristics: in the described step (c), radio network controller comprises following action when Target cell is admitted, give described user equipment allocation resource, finish and described base station between Radio Link foundation or reshuffle preparation, determine the time point that will set up or reshuffle; The information of described Target cell comprises the frequency information and the scrambling code information of Target cell.
Said method can have following characteristics: described step (d) also comprises step afterwards: after radio network controller receives that message is finished in described radio bearer foundation, set up response message to RAB of core net feedback, enter normal communication process then.
As from the foregoing, the inventive method is simple, logic is reasonable, efficient is high, can guarantee well that the WCDMA system is when the UE business is set up, earlier part UE is cut acceptance service to the lower same coverage cell of load, make a plurality of loads realize the equilibrium of loading preferably with the covering alien-frequency district, thereby realize the maximization of overall system capacity, also can make things convenient for the smooth access of follow-up UE.
In addition, the inventive method can also be avoided the frequent equilibrium treatment that may occur from two aspects.On the one hand be to be lower than one when setting thresholding,, think that the current area of this moment also has preferably ability to admit new user no matter with the load condition that covers alien-frequency district how it all needn't make equilibrium treatment at the current area load; On the other hand, two sub-districts are done duty ratio in, by setting a sluggish thresholding, only when current area exceeds this sluggishness thresholding with its load difference with the covering alien-frequency district, just do load balancing and handle, thereby safeguard the current service quality that has inserted UE to greatest extent.
Description of drawings
Fig. 1 is the main flow chart of embodiment of the invention load balance control method;
Fig. 2 is the flow chart of public-measurement between embodiment of the invention RNC and the Node B;
Message flow chart when Fig. 3 is embodiment of the invention public-measurement;
Fig. 4 is the flow chart of embodiment of the invention RNC select target sub-district process;
Fig. 5 is the message flow chart of embodiment of the invention business when setting up.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
The present invention is applied to the WCDMA system that is made up of core net (CN), land radio access web (UTRAN) and subscriber equipment (UE), UTRAN comprises and manyly is connected to the RNS collection (RNS) of CN by the Iu interface that a RNS comprises a radio network controller (RNC) and one or more base station (Node B).Node B comprises one or more sub-districts, is connected on the RNC by Iub interface.Also can pass through Iur interactive interfacing information between the RNC among each RNS.
The main flow of present embodiment load balance control method may further comprise the steps as shown in Figure 1:
After step 130, UE side are finished radio bearer foundation action, in Target cell, return radio bearer foundation and finish message.
In the step 100, RTWP is an amount that directly reflects the cell uplink disturbed condition, and TCP is an amount that directly reflects the cell downlink transmitting power, and under the condition that plot planning is determined, two measuring amount can represented the load condition of the uplink and downlink of a sub-district respectively.In 3GPP TS 25.331 standards, the public-measurement report reporting of Node B can selection cycle reports or Event triggered reports mode in the WCDMA system, and present embodiment adopts the periodic report mode.
Shown in Figure 2 is the idiographic flow of the public-measurement between RNC and Node B, may further comprise the steps:
Step 200, RNC sends sub-district public-measurement control command to Node B, requires Node B period measurement and reports RTWP and the measured value of TCP, except that measuring amount, also comprises the information such as gap, filtration coefficient of periodic report in the measurement control order that sends;
Step 210, Node B receives the public-measurement control command that RNC sends, and measures as requested, and regularly to RNC reporting measurement result, promptly each is with the RTWP and the TCP measured value that cover alien-frequency district;
Step 220, the measurement result that RNC storage Node B reports is used during for needs.
Fig. 3 shows corresponding to the message flow between the RNC of above-mentioned public-measurement flow process and Node B:
Step 300, RNC sends public-measurement to Node B and initiates request (Common MeasurementInitiation Request);
Step 310 when Node B thinks that in inspection the ability of oneself can be competent at measurement, is returned public-measurement initial communication (Common Measurement Initiation Response) to RNC, and is begun to measure;
Step 320, Node B sends public-measurement report (Common Measurement Report) to RNC when reaching report condition;
Step 330, for the periodic report mode, Node B reports the one-shot measurement result to RNC at set intervals.
The public-measurement report of Node B also can adopt Event triggered to report mode, for reporting events, RNC in the public-measurement order that each Node B sends except that measuring amount, also need to set parameters such as the thresholding that reports, triggered time, when Node B satisfies in the incident of setting, to RNC reporting measurement result.
Insert as UE, the idiographic flow when business is set up may further comprise the steps as shown in Figure 4:
Step 400, when RNC receives and sets up message (RAB AssignmentRequest) from the RAB of CN, trigger frequently between balanced judgement action;
Step 410, relatively each judges with the load condition that covers alien-frequency district whether the current area load is lower than default threshold value to RNC, if, execution in step 440, otherwise carry out next step;
Step 420 judges whether to exist load to be lower than the same covering alien-frequency district of current area, if, carry out next step, otherwise, execution in step 440;
Step 430, the same covering alien-frequency district that load is lower is as setting up professional Target cell, execution in step 450;
Step 440 is with the Target cell of current area as the foundation business;
Step 450, RNC action such as admits at Target cell, sends radio bearer to this UE after finishing and sets up order;
After step 460, UE side are finished radio bearer foundation action, in Target cell, return radio bearer foundation and finish message.
Above-mentioned flow process judges whether the load of current area is lower than a threshold value that sets in advance earlier in step 410, if, think that then the load of this sub-district is in a lower level, directly the Target cell that current area is set up as business needn't carry out the judgement of load balancing between frequency.Can effectively reduce the possibility of the call drop that causes owing to direct-cut operation between taking place frequently like this.
In the above-mentioned steps 420, carry out load condition when judgement, present embodiment is that the uplink and downlink direction is taken all factors into consideration, simultaneously with the TCP value of the RTWP value of up direction and down direction as duty ratio reference between each sub-district.The decision rule of payload has multiple, and a simple example is to think that just the load of this sub-district is bigger when two measured values are all big, and two measured values all hour think that just the load of this sub-district is less.
Be limited as in the main system at up direction or down direction, the TCP value that also can only select the RTWP value of up direction or down direction is as duty ratio reference between each sub-district.Accordingly, in both cases, the measuring amount of RNC in the public-measurement control command that Node B sends can only comprise RTWP or TCP.
Further, two sub-districts are done duty ratio than the time, can also set a sluggish thresholding, when current area load exceeds it and reaches this sluggishness thresholding with the difference that covers alien-frequency district load, the hand-off process of ability execution in step 430, otherwise still execution in step 440, thereby safeguard the current service quality that has inserted UE to greatest extent.
In the step 450, when RNC action such as admits at Target cell, need to give corresponding UE to distribute adequate resources, finish and the base station between Radio Link foundation or reshuffle preparation, determine the time point that will set up or reshuffle etc.; After wireless access network (RAN) side is finished all preparation, send radio bearer by RNC to UE and set up message, in this command messages with on the relevant information (frequency information, scrambling code information) of Target cell and the resource information of being distributed, if Target cell is that then this radio bearer is set up message and come down to direct-cut operation command messages between a frequency with the covering alien-frequency district.
In the step 460, RNC receives radio bearer that UE returns and sets up and finish message from Target cell, and the radio bearer of expression UE side is set up action and finished smoothly.RNC also can feed back the response message that a RAB is set up to CN, enters normal communication process then.
Message flow when Fig. 5 shows the present embodiment business and sets up between UE, RNC, the CN:
Step 520 sends radio bearer to UE and sets up message (Radio Bearer Setup);
Step 530 after the radio bearer foundation action of UE side is finished, is returned radio bearer foundation to RNC and is finished message (Radio Bearer Setup Complete);
In addition, if in current area, can not admit the time, also can attempt admitting with covering in the alien-frequency district, and the sub-district that can admit is as Target cell at it owing to reasons such as sign indicating number resources.
In sum, the present invention makes full use of the measurement result that Node B reports in the WCDMA system, in RNC, according to current area and with the load measurement value that covers alien-frequency district, be the situation of each sub-district reception total wideband power and/or emission carrier power, whether professional UE is being set up in decision needs equilibrium to cover alien-frequency district together to other.The inventive method is simple, logic is reasonable, efficient is high, can guarantee well that the WCDMA system is when the UE business is set up, earlier part UE is cut acceptance service to the lower same coverage cell of load, make a plurality of loads realize load balancing preferably with the covering alien-frequency district, thereby realize the maximization of overall system capacity, also can make things convenient for the smooth access of follow-up UE.
Claims (10)
1, the load equalization method in a kind of broadband CDMA system may further comprise the steps:
(a) radio network controller obtains the measured value of each cell load situation of reflection from each with the base station that covers alien-frequency district;
(b) radio network controller receives after core net sets up message to the RAB of subscriber equipment, and relatively current area and its are with the load that covers alien-frequency district, and the load balancing switching condition in conjunction with setting is described subscriber equipment selected target sub-district;
(c) admit action at described Target cell, send radio bearer to described subscriber equipment after finishing and set up order, carry the information of Target cell and the information of Resources allocation;
(d) after the radio bearer of described user equipment side foundation action is finished, in Target cell, return radio bearer foundation and finish message.
2, the method for claim 1 is characterized in that, described step (a) further may further comprise the steps:
Described radio network controller sends sub-district public-measurement control command with the base station that covers alien-frequency district to each, comprises the measuring amount of setting and the parameter relevant with reporting mode;
Described base station is measured after receiving described public-measurement control command as requested, when satisfying report condition, to described radio network controller reporting measurement result;
The measurement result that described radio network controller storage base station reports, supply and demand will the time use.
3, method as claimed in claim 2 is characterized in that, described measured value perhaps is the emission carrier power for receiving total wideband power, perhaps for receiving total wideband power and emission carrier power.
4, method as claimed in claim 2 is characterized in that, described base station is that periodic report mode or Event triggered report mode to the mode of radio network controller reporting measurement value.
5, the method for claim 1 is characterized in that, in the described step (b), radio network controller further may further comprise the steps according to the process of cell load select target sub-district:
(b1) described each load condition with the covering alien-frequency district of radio network controller inquiry judges whether to exist load to be lower than the same covering alien-frequency district of current area load, if exist, carries out next step, otherwise, execution in step (b3);
(b2) will load lower same covering alien-frequency district as setting up professional Target cell, execution in step (c);
(b3) with the Target cell of current area as the foundation business, execution in step (c).
6, method as claimed in claim 5, it is characterized in that, in the process of described radio network controller according to cell load select target sub-district, also comprise step before in described step (b1): judge whether the current area load is lower than default threshold value, if, execution in step (b3), otherwise execution in step (b1).
7, as claim 5 or 6 described methods, it is characterized in that, also comprise step after the described step (b1): judge that the current area load exceeds it and whether reaches default sluggish thresholding with the difference that covers the alien-frequency district load, if, execution in step (b2), otherwise execution in step (b3).
8, method as claimed in claim 5 is characterized in that, when carrying out the comparison of minizone load, only receives the comparison of total wideband power or emission carrier power, perhaps to receiving total wideband power and launching carrier power and comprehensively compare.
9, the method for claim 1, it is characterized in that, in the described step (c), radio network controller comprises following action when Target cell is admitted: give described user equipment allocation resource, finish and described base station between Radio Link foundation or reshuffle preparation, determine the time point that will set up or reshuffle; The information of described Target cell comprises the frequency information and the scrambling code information of Target cell.
10, the method for claim 1, it is characterized in that, described step (d) also comprises step afterwards: radio network controller is set up response message to RAB of core net feedback after receiving that message is finished in described radio bearer foundation, enters normal communication process then.
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| WO2017185880A1 (en) * | 2016-04-26 | 2017-11-02 | 中兴通讯股份有限公司 | Cell switching method and device |
| CN107318124A (en) * | 2016-04-26 | 2017-11-03 | 中兴通讯股份有限公司 | A kind of cell switching method and device |
| CN107801214A (en) * | 2016-09-07 | 2018-03-13 | 上海中兴软件有限责任公司 | A kind of traffic put-on method and device for balanced load |
| CN111356179A (en) * | 2018-12-21 | 2020-06-30 | 中兴通讯股份有限公司 | Load balancing method, device, equipment and storage medium |
| CN111356179B (en) * | 2018-12-21 | 2023-10-17 | 中兴通讯股份有限公司 | Load balancing method, device, equipment and storage medium |
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