CN100407851C - Loading balancing method in layering zone structure - Google Patents
Loading balancing method in layering zone structure Download PDFInfo
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- CN100407851C CN100407851C CN2004100307694A CN200410030769A CN100407851C CN 100407851 C CN100407851 C CN 100407851C CN 2004100307694 A CN2004100307694 A CN 2004100307694A CN 200410030769 A CN200410030769 A CN 200410030769A CN 100407851 C CN100407851 C CN 100407851C
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Abstract
The present invention discloses a loading balancing method in a layering subzone structure, which comprises the main processing steps: a. setting load target values and load margins for all the subzones in the layering subzone structure; b. monitoring the current load level of all the subzones, and judging whether subzones whose load level exceeds the load target value exist, if existing, using the subzones as source subzones and executing step c; else, executing step b; c. judging whether subzones whose load difference values are larger than the load margins exist in the subzones covering the source subzones, if existing, executing step d, else, returning to step b; d. selecting target subzones in the subzones conforming to the condition in step c according to a predefined principle, and selecting a user having highest mobile speed in the source subzones as a switching user; e. switching the switching user to a selected target subzone. The method of the present invention can meet requirements for user dispatching among the subzones in different layers when a system having the layering subzone structure can realize the balanced load of subzones.
Description
Technical field
The present invention relates to a kind of balancing method of loads, the balancing method of loads in particularly a kind of layered cell structure.
Background technology
In CDMA, CDMA2000 and WCDMA system, for the purpose that improves power system capacity, can set up macrocell and the Microcell that the overlay area varies in size simultaneously at the hot zones that traffic carrying capacity is high, even picocell.Wherein, the coverage of a macrocell comprises the coverage of a plurality of Microcells, and a Microcell has covered a plurality of picocells again, Here it is so-called layered cell structure (HCS).
Fig. 1 is the layered cell structure schematic diagram.As shown in Figure 1, the cell structure of system is divided into three layers.Wherein, the 3rd layer is macrocell, is mainly used to satisfy on a large scale cover continuously; The second layer is a Microcell, and capacity mainly is provided; Ground floor is a picocell, is used for realizing coverings more among a small circle such as indoor, escalator.Here, macrocell X has covered Microcell A, B and C; Microcell A has covered picocell 1,2,3,4 and 5 again, and Microcell B has also covered picocell 6,7 and 8.Such layered cell structure can satisfy big capacity and the big requirement that covers originally with lower one-tenth.The business demand situation is different in the frequency resource that obtains according to operator and the network, and layered cell structure can be divided into the different numbers of plies, and the different layers in the hierarchy can dispose identical or different carrier frequency.
In addition, at the system applies initial stage, because telephone traffic is little, often a sub-district covers a certain zone.Increasing along with the user, the covering of a sub-district is difficult to satisfy growing telephone traffic demand, and tend to increase one or more sub-districts at hot zones and absorb telephone traffic this moment, and disposed different carrier frequency for different districts.A plurality of alien-frequency districts so just occur and cover same area, be i.e. the situation of " alien frequencies is with covering ".
Fig. 2 is the schematic diagram that a plurality of alien-frequency districts cover same area.As shown in Figure 2, in the i layer of layered cell structure, at the system applies initial stage, carrier frequency is A1 overlay area, the sub-district A of f1, and carrier frequency is B1 overlay area, the sub-district B of f1, and carrier frequency is the cell coverage area C of f1; When sub-district A1 can not satisfy traffic demand, having increased carrier frequency again at regional A was that the sub-district A2 of f2 and sub-district A3 that carrier frequency is f3 absorb telephone traffic.Therefore in the i layer, carrier frequency occurred and be respectively sub-district A1, the A2 of f1, f2 and f3 and the A3 phenomenon of overlay area A simultaneously.
System in reality is in service, because new access of calling out, location of mobile station change the switching that causes, the factors such as variation, external interference and environmental change of terminal transmission/receiving velocity all can cause the load generation change at random of each sub-district, therefore the situation of laod unbalance can appear.The sub-district that has is may load heavier and communication quality is had a strong impact on, and because cdma system is the soaring mutually system of self-interference, in case acquiring a certain degree, the load of system will systematic function be worsened rapidly, cause in the system professional service quality (QoS) not to be met, even serious consequence such as a large number of users call drop occurs; But simultaneously, the possible again load in other sub-district is very light, and like this, system resource just is not fully used.For avoiding the appearance of this situation, system need control the selection and the utilization of resource, to reach the load balance of each sub-district, effectively utilizes Radio Resource as far as possible.
Therefore, in the system of layered cell structure, need take certain balancing method of loads, systematic function is optimized.The main design philosophy of existing balancing method of loads is: in the unified level of cell structure, if there are a plurality of alien-frequency districts to cover same area, then the user in the overweight sub-district of load is switched in the light sub-district of load, make load be evenly distributed in the different sub-districts.
Fig. 3 is a prior art balancing method of loads handling process schematic diagram, and its key step is as follows:
Step 301: for each sub-district is provided with absolute thresholding of load (Tabs) and load difference thresholding (Trel).
Step 302: the load state of each sub-district is periodically monitored and obtained to the network equipment, judged whether cell load greater than Tabs, if having, the sub-district that then will meet this condition is decided to be the cell-of-origin, execution in step 303; Otherwise return step 302.
Step 303: whether judge to be in other identical all sub-districts of the overlay area of same level with the cell-of-origin has the sub-district to satisfy condition: the difference of the load of cell-of-origin load and this sub-district is greater than Trel, if having, then execution in step 304; Otherwise return step 302.
Step 304: the network equipment selects the mobile subscriber who is in communications status in the cell-of-origin to switch to the minimum sub-district of load in all sub-districts that meet the described condition of step 303.
Here owing to only switch covering between the alien-frequency district of same area, therefore, execution be the alien frequencies direct-cut operation, promptly before switching, Target cell is not measured, but is directly switched in the past in the mode of " blind switching ".
As seen described by Fig. 3, the method for prior art is only carried out the load balance processing in the sub-district of same level, do not consider the load balance between each layer in the layered cell structure, can not effectively solve the load balance problem of whole system.And the method for prior art is not considered in the layered cell structure user's scheduling requirement between the different layers sub-district, does not just make full use of layered cell structure provides covering for different translational speed users advantage yet.Therefore, the described method of Fig. 3 balance sysmte load effectively.
In layered cell structure, for different translational speed users provide covering, also can adopt certain user's scheduling strategy in addition for better.Prior art adopts the user's scheduling strategy based on user moving speed usually, the user that system's high speed is moved is assigned to the high-rise sub-district with bigger covering, as macrocell, most of user that low speed is moved is assigned to the low layer sub-district that can improve power system capacity, as Microcell, the user rationally is distributed in the different levels in the layered cell structure.
Fig. 4 is a prior art user scheduling strategy handling process schematic diagram, and its key step is as follows:
Step 401: maximum speed (VH) and minimum speed (VL) that user moving speed in each layer sub-district is set.
Step 402: the network equipment carries out velocity estimation to all mobile subscribers that are in communications status in each sub-district.
Step 403: whether judge user moving speed greater than VH or less than VL, if greater than VH, then this user is in high-speed moving state, execution in step 404; If less than VL, then this mobile subscriber is in the low speed mobile status, execution in step 406; If between VH and VL, then return step 402.
Step 404: judge whether that more high-rise sub-district is covered with the sub-district at active user place, if having, then execution in step 405; Otherwise return step 402.
Step 405: this user is switched to more high-rise sub-district, end process.
Step 406: judge whether that more the sub-district of low layer is covered with by current area, if having, then execution in step 407; Otherwise return step 402.
Step 407: determine the Target cell that to insert, and this user is switched to the more Target cell of low layer, end process.
Adopt the described processing method of Fig. 4 by user's translational speed being estimated and being carried out user's scheduling according to user moving speed, reasonablely solved in the layered cell structure user frequent the switching caused the too much problem of signaling in the minizone, but this user's scheduling strategy itself is not considered between layered cell structure middle level and the layer or the load balance between each carrier frequency, therefore can not solve the problem of laod unbalance in the layered cell structure.
Therefore, how providing a kind of method can not only satisfy user's scheduling requirement between the different layers sub-district but also can guarantee the load balance of minizone, is problem demanding prompt solution in the present layered cell structure load balancing techniques.
Summary of the invention
In view of this, main purpose of the present invention is to provide the balancing method of loads in a kind of layered cell structure, can make the system of layered cell structure, when realizing the cell load balance, satisfies the needs of user's scheduling between the different layers sub-district.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses the balancing method of loads in a kind of layered cell structure, its main treatment step is as follows:
A. for all sub-districts in the layered cell structure load target value and load surplus are set;
B. the network equipment is monitored the current load level in all sub-districts, and has judged whether its load target value of cell load horizontal exceeding, if having, with this sub-district as the cell-of-origin, execution in step c; Otherwise continue execution in step b;
C. judge the load difference that in all overlay cell that cover the cell-of-origin whether the sub-district is arranged greater than the load surplus, if having, execution in step d; Otherwise return step b; Described load difference is that the load target value of this sub-district deducts the difference that its load level obtains; D. in the sub-district that meets the described condition of step c by predetermined principle select target sub-district, and in the cell-of-origin, select the fastest user of translational speed as switching the user;
E. will switch the user and switch to selected Target cell.
Wherein, described step a can for, for the sub-district that is in the same level is provided with identical load target value and load surplus, for the sub-district that is in different levels is provided with identical load target value and load surplus, for the sub-district that is in different levels is provided with different load target value and identical load surplus, for the sub-district that is in different levels is provided with identical load target value and different load surpluses, perhaps, for the sub-district that is in different levels different load target value and different load surpluses are set.
Among the step c, described all overlay cell are all last layer sub-districts.
In the steps d, described predetermined principle can for, in the described qualified sub-district of step c, select any one sub-district as Target cell.
In the steps d, described predetermined principle can for, in the described qualified sub-district of step c, select the minimum sub-district of load as Target cell.
Among the step c,, can further include step when the load difference that does not have the sub-district in all overlay cell of judging the cell-of-origin during greater than the load surplus:
A1. in the cell-of-origin, select the slowest user of translational speed as the switching user, and the underlay cell that the cell-of-origin covers is carried out signal measurement by this user;
B1. judge whether in steps according to the signal measurement result that the described underlay cell of a1 can insert and switch the user, if, by predetermined principle select to insert switch the user the sub-district as Target cell, change step e again over to; Otherwise return step b.
Among the step b1, described predetermined principle can for, in can inserting the sub-district of switching the user, select any one sub-district as Target cell.
Among the step b1, described predetermined principle can also for, in can inserting the sub-district of switching the user, select a best sub-district of signal as Target cell.
In the steps d, described predetermined principle can also for, in step c in qualified all sub-districts, any one sub-district of sub-district of selecting to be arranged in lowermost layer is as Target cell.
In the steps d, described predetermined principle can also for, in step c in qualified all sub-districts, select to be arranged in the minimum sub-district of the load of sub-district of lowermost layer as Target cell.
Among the step e, described the user is switched to after the Target cell, can further include, return step b.
By such scheme as can be seen, key of the present invention is:
For each level in the layered cell structure is provided with different cell load desired values and load surplus, and monitor the load level of each sub-district in real time; When monitoring active cell load level when exceeding load target value, judge in the sub-district that covers the cell-of-origin and whether the load difference of sub-district is arranged greater than the load surplus, and from qualified sub-district, determine Target cell, then the fastest user of translational speed in the cell-of-origin is switched to Target cell.
Therefore, the inventive method can be when certain cell load be overweight, the user who considers different levels in the layered cell structure dispatches needs, selecting suitable Target cell and mobile subscriber to carry out interlayer switches, not only can give the lighter sub-district of other load with the load allocating of this sub-district, and can make the high-speed mobile user insert high-rise sub-district, make the low speed mobile subscriber be in the low layer sub-district, promptly when realizing the system load balance, give full play to layered cell structure for the advantage of covering is provided without the translational speed user.
Therefore, the balancing method of loads in the layered cell structure provided by the present invention can be realized the load balance in the layered cell structure, and can satisfy the needs of user's scheduling between the different layers sub-district, thereby systematic function is improved greatly.
Description of drawings
Fig. 1 is the layered cell structure schematic diagram;
Fig. 2 is the schematic diagram that a plurality of alien-frequency districts cover same area;
Fig. 3 is a prior art balancing method of loads handling process schematic diagram;
Fig. 4 is a prior art user scheduling strategy handling process schematic diagram;
Fig. 5 is first preferred embodiment handling process schematic diagram of the inventive method;
Fig. 6 is second preferred embodiment handling process of the inventive method schematic diagram;
Fig. 7 is the 3rd preferred embodiment handling process schematic diagram of the inventive method.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 5 is first preferred embodiment handling process schematic diagram of the inventive method.In the present embodiment, when system monitoring when active cell load level exceeds load target value, judge in the last layer sub-district of cell-of-origin and whether the load difference of sub-district is arranged greater than the load surplus, and from qualified last layer sub-district, determine Target cell, the faster user of translational speed in the cell-of-origin is switched to Target cell.Load difference described in the inventive method is that the load target value of sub-district deducts the difference that its load level obtains.
As shown in Figure 5, its concrete treatment step is:
Step 501:, but the sub-district that is in different levels is provided with different load target value and load surplus for the sub-district that is in identical level in the layered cell structure is provided with identical load target value and load surplus.
Set in embodiment of the present invention, have N layer sub-district in the layered cell structure, then the load target value of i layer sub-district is expressed as T
i, the load surplus is expressed as M
iHere, i and N are the integer more than or equal to 1, and the span of i is 1 to N.
In the methods of the invention, load target value and the load surplus that is in the sub-district of identical level also can be set to different, and the load target value of different layers sub-district and load surplus can be the same or different.In order to satisfy the different needs of different layers sub-district, for the sub-district that is in identical level is provided with identical load target value and load surplus, and the load target value of different layers sub-district is set to different with the load surplus in embodiments of the present invention.For example, macrocell is in order to satisfy high-speed mobile user's covering, and then all macrocell load target value need be provided with smallerly, to guarantee that the highspeed user can insert smoothly; And Microcell is for the covering of satisfying low speed user and improves power system capacity, and then all Microcell load target value can be provided with more greatly.
Step 502: the network equipment is monitored the load of all sub-districts in the i layer, obtains the current load level in each sub-district, and and the corresponding T in this layer sub-district
iCompare.
Wherein, load monitoring generally adopts the method for period measurement, but specifically adopts what method not belong to content of the present invention and also do not influence validity of the present invention, does not therefore do detailed description here.
Step 503: judged whether that the sub-district satisfies load level＞T
iWhether condition promptly has its load target value of load horizontal exceeding of sub-district, if having, then execution in step 504; Otherwise, return step 502.
Here, satisfy load level＞T
iThe sub-district of condition is called the cell-of-origin, and the cell-of-origin can be macrocell, Microcell or picocell etc.
Step 504: check the loading condition of last layer sub-district, cell-of-origin, promptly check the loading condition that the i+1 layer covers the sub-district of cell-of-origin.
This audit process is specially, and has judged whether that the last layer sub-district satisfies T
I+1-load level＞M
I+1Condition, the load difference of last layer sub-district that promptly judges whether to cover the cell-of-origin is greater than the load surplus, if having, then execution in step 505; Otherwise return step 502.
Step 505: from the sub-district that meets the described condition of step 504,, obtain user moving speed information in the cell-of-origin simultaneously, and select the fastest user of translational speed as switching the user by predetermined principle select target sub-district.
Describe as can be known by background technology, in the same level of layered cell structure, a plurality of sub-districts of different carrier frequency of having distributed may occur and cover identical zone, therefore may occur one or more sub-districts in step 504 meets described condition, the predetermined principle of so described select target sub-district is: if qualified sub-district has only one, then this sub-district is decided to be Target cell; If it is a plurality of that qualified sub-district has, then can select a sub-district as Target cell or select the minimum sub-district of present load level arbitrarily as Target cell.
Because, the Target cell that switches is the last layer sub-district of cell-of-origin, and mainly be to provide bigger coverage, thereby solved the highspeed user because of frequent the switching makes signaling too much cause the problem of system resource waste in the low layer minizone for the high-speed mobile user in layered cell structure sub-district on the middle and senior level.Therefore in the present embodiment, when from the cell-of-origin, selecting to switch the user, select the fastest user of those translational speeds to switch to the last layer sub-district.
Here, translational speed information can be collected by velocity estimation.Speed estimation method at present commonly used is to measure the number of times that the user switches between the sub-district in some cycles, and switching times is many more, illustrates that then the speed that the user moves is fast more.Do not belong to the problem of the present invention's design owing to realize the distinct methods of velocity estimation, therefore do not do detailed description here.
Step 506: the described switching of step 505 user is switched to described Target cell, return step 502 again.
Because Target cell is that the last layer sub-district of cell-of-origin has covered the cell-of-origin fully, and system can obtain to switch required Target cell relevant information, as scrambling code information and timing information etc., therefore, adopts the mode of " blind switching " to switch here.
Wherein, step 502 to step 506 is handled for the load balance that present embodiment carries out for all sub-districts of i layer in the layered cell structure; Wherein, step 504 to step 506 is handled for the load balance that present embodiment carries out above the sub-district of desired value for a load of i layer in the layered cell structure, when having occurred a plurality of loads in the i layer and exceed the sub-district of desired value, all can walk abreast to wherein each sub-district and to carry out step 504 to the described processing of step 506; And when a user in finishing a sub-district is switched, system also can turn back to step 502 and again the loading condition of all sub-districts in the i layer be monitored, so present embodiment can carry out real-time load monitoring and load balance processing to all sub-districts in the i layer.
When moving in system simultaneously, in the layered cell structure, from the 1st layer to the equal executed in parallel of N layer step 502 to the described load balance handling process of step 506, like this, guaranteed load monitoring is carried out in each sub-district in each layer, and when certain cell load is overweight with the load allocating of this sub-district to its last layer sub-district, to reach the effect of load balance.
By the described embodiment of Fig. 5 as seen, use present embodiment and can guarantee the load balance of each layer minizone, and can satisfy layered cell structure for user's scheduling requirement between the different layers sub-district.
Fig. 6 is second preferred embodiment handling process of the inventive method schematic diagram.In the present embodiment, when system monitoring when active cell load level exceeds load target value, judge in all overlay cell of cell-of-origin and whether the load difference of sub-district is arranged greater than the load surplus, and from all qualified overlay cell, determine Target cell, the faster user of translational speed in the cell-of-origin is switched to Target cell.
As shown in Figure 6, its concrete treatment step is:
Step 601:, but the sub-district that is in different levels is provided with different load target value and load surplus for the sub-district that is in identical level in the layered cell structure is provided with identical load target value and load surplus.
Step 602: the network equipment is monitored the load of all sub-districts in the i layer, obtains the current load level in each sub-district, and and the corresponding T in this layer sub-district
iCompare.
Step 603: judged whether that the sub-district satisfies load level＞T
iWhether condition promptly has its load target value of load horizontal exceeding of sub-district, if having, then execution in step 604; Otherwise, return step 602.
Here, satisfy load level＞T
iThe sub-district of condition is called the cell-of-origin, and the cell-of-origin can be macrocell, Microcell or picocell etc.
Step 604: check the loading condition of all overlay cell of cell-of-origin, promptly check the loading condition that covers all sub-districts of cell-of-origin in i+1 to the N layer.Here, the load target value that covers the overlay cell of this cell-of-origin is expressed as T
j, the load surplus is expressed as M
jWherein, j is an integer, and its span is i+1 to N.
This audit process is specially, and has judged whether that overlay cell satisfies T
j-load level＞M
jCondition is promptly judged the load difference that in all overlay cell that cover the cell-of-origin whether the sub-district is arranged greater than the load surplus, if having, and execution in step 605; Otherwise return step 602.
Step 605: from the sub-district that meets the described condition of step 604 by predetermined principle select target sub-district.
Because, in step 605, may have one or more sub-districts and meet the described condition of step 604.If a plurality of sub-districts are arranged, cover identical zone owing in one deck sub-district, may have a plurality of sub-districts of different carrier frequency of having distributed, then each sub-district may be distributed in the identical or different level, and the sub-district that is distributed in same level also has one or more, the predetermined principle of select target sub-district is so: if qualified sub-district has only one, then this sub-district is decided to be Target cell; If it is a plurality of that qualified sub-district has, then select a sub-district as Target cell or select the minimum sub-district of present load level arbitrarily as Target cell from the sub-district that is arranged in lowermost layer.
Step 606: from the cell-of-origin, select the fastest user of translational speed as switching the user.
Because the Target cell of switching is the overlay cell of cell-of-origin, and mainly be that user for high-speed mobile provides bigger coverage in layered cell structure sub-district on the middle and senior level.Therefore in the present embodiment, when from the cell-of-origin, selecting to switch the user, select the fastest user of those translational speeds to switch to overlay cell.
Step 607: the described switching of step 606 user is switched to the selected Target cell of step 605, return step 602 again.
Because Target cell is that the overlay cell of cell-of-origin has covered the cell-of-origin fully, and system can obtain to switch required Target cell relevant information, as, therefore scrambling code information and timing information etc., adopt the mode of " blind switching " to switch here.
Wherein, step 602 to step 607 is handled for the load balance that present embodiment carries out for all sub-districts of i layer in the layered cell structure; Wherein, step 604 to step 607 is handled for the load balance that present embodiment carries out above the sub-district of desired value for a load of i layer in the layered cell structure, when having occurred a plurality of loads in the i layer and exceeded the sub-district of desired value, all can walk abreast to wherein each sub-district and to carry out step 604, and a user in finishing a sub-district is when switching to the described processing of step 607; System also can turn back to step 602 and again the loading condition of all sub-districts in the i layer be monitored, so present embodiment can carry out real-time load monitoring and load balance processing to all sub-districts in the i layer.
When moving in system simultaneously, in the layered cell structure, from the 1st layer to the equal executed in parallel of N layer step 602 to the described load balance handling process of step 607, like this, guaranteed load monitoring is carried out in each sub-district in each layer, and when certain cell load is overweight with the load allocating of this sub-district to its overlay cell, to reach the effect of load balance.
In addition, in the step 604 of present embodiment, check the overlay cell loading condition and be not limited to the last layer sub-district of cell-of-origin, but all overlay cell of cell-of-origin are all checked, select target sub-district again, so just enlarged the scope of balanced source cell load, also just increased the possibility of cell-of-origin load allocating, thereby the efficient of system load balance is improved greatly to other sub-district.
By the described embodiment of Fig. 6 as seen, use present embodiment and can realize the load balance of each layer minizone, and can satisfy layered cell structure for user's scheduling requirement between the different layers sub-district.
Fig. 7 is the 3rd preferred embodiment handling process schematic diagram of the inventive method.In the present embodiment, when system monitoring when active cell load level exceeds load target value, judge in all overlay cell of cell-of-origin and whether the load difference of sub-district is arranged greater than the load surplus, perhaps from all qualified overlay cell, determine Target cell, again the fastest user of translational speed in the cell-of-origin is switched to Target cell, perhaps do not having under the situation of qualified overlay cell, from underlay cell, determine Target cell, the slower user of translational speed in the cell-of-origin is switched to Target cell.
As shown in Figure 7, its concrete treatment step is:
Step 701:, but the sub-district that is in different levels is provided with different load target value and load surplus for the sub-district that is in identical level in the layered cell structure is provided with identical load target value and load surplus.
Step 702: the network equipment is monitored the load of all sub-districts in the i layer, obtains the current load level in each sub-district, and and the corresponding T in this layer sub-district
iCompare.
Step 703: judged whether that the sub-district satisfies load level＞T
iWhether condition promptly has its load target value of load horizontal exceeding of sub-district, if having, then execution in step 704; Otherwise, return step 702.
Here, satisfy load level＞T
iThe sub-district of condition is called the cell-of-origin, and the cell-of-origin can be macrocell, Microcell or picocell etc.
Step 704: check the loading condition of all overlay cell of place, cell-of-origin layer, promptly check the loading condition that covers all sub-districts of cell-of-origin in i+1 to the N layer.Here, the load target value of the overlay cell of this covering cell-of-origin is expressed as T
j, the load surplus is expressed as M
jWherein, j is an integer, and its span is i+1 to N.
This audit process is specially, and has judged whether that overlay cell satisfies T
j-load level＞M
jCondition is promptly judged the load value that in all overlay cell that cover the cell-of-origin whether the sub-district is arranged greater than the load surplus, if having, and execution in step 705; Otherwise execution in step 708.
Step 705: from the sub-district that meets the described condition of step 704 by predetermined principle select target sub-district.
Because, in step 705, may have one or more sub-districts and meet the described condition of step 704.If a plurality of sub-districts are arranged, cover identical zone owing in one deck sub-district, may have a plurality of sub-districts of different carrier frequency of having distributed, then each sub-district may be distributed in the identical or different level, and the sub-district that is distributed in same level also has one or more, the predetermined principle of select target sub-district is so: if qualified sub-district has only one, then this sub-district is decided to be Target cell; If it is a plurality of that qualified sub-district has, then select a sub-district as Target cell or select the minimum sub-district of present load level arbitrarily as Target cell from the sub-district that is arranged in lowermost layer.
Step 706: from the cell-of-origin, select the fastest user of translational speed as switching the user.
Step 707: will switch the user and switch to Target cell, and return step 702 again.
Step 708: from the cell-of-origin, select the slowest user of translational speed as switching the user.
Step 709: by the switching user described in the step 708 to all underlay cell that the cell-of-origin covered, promptly signal measurement is carried out in the 1st layer of all sub-district that the cell-of-origin covered to the i-1 layer, and judge whether to insert this user's underlay cell according to measurement result, if have, then execution in step 706; Otherwise return step 702.
Here, can obtain the cell list that signal level can make this user insert to the measurement report of underlay cell,, illustrate that existence can insert this user's underlay cell, then changes step 710 over to if tabulation be empty according to the user; Otherwise tabulation illustrates not have the underlay cell that can insert this user for empty, then returns step 702.
Step 710: from the described cell list of step 709,, change step 707 again over to by predetermined principle select target sub-district.
Here, the predetermined principle of select target sub-district is: if in the tabulation sub-district is only arranged, then this sub-district is decided to be Target cell; If in the tabulation a plurality of sub-districts are arranged, then select a sub-district arbitrarily or select the best sub-district of signal as Target cell.Wherein, the signal quality of sub-district can obtain by switching the measurement report of user in step 709.
Because, in Hierarchical Cell Structure, the low speed mobile subscriber is mainly inserted to improve power system capacity in the low layer sub-district, high-rise sub-district is mainly the high-speed mobile user provides bigger coverage, therefore, in the present embodiment, in step 706, select the fastest user of translational speed to switch, and in step 708, select the slowest user of translational speed to switch to underlay cell to overlay cell.Like this, carry out also having satisfied the needs that the user dispatches between each layer in the layered cell structure when load balance is handled in system.
Wherein, step 702 to step 710 is handled for the load balance that present embodiment carries out for all sub-districts of i layer in the layered cell structure; Wherein, step 704 to step 710 is handled for the load balance that present embodiment carries out above the sub-district of desired value for a load of i layer in the layered cell structure, when having occurred a plurality of loads in the i layer and exceed the sub-district of desired value, all can walk abreast to wherein each sub-district and to carry out step 702 to the described processing of step 710; And when a user in finishing a sub-district is switched, system also can turn back to step 702 and again the loading condition of all sub-district of i layer be monitored, so present embodiment can carry out real-time load monitoring and load balance processing to all sub-districts in the i layer.
Simultaneously, when system moves, in the layered cell structure, from the 1st layer to the equal executed in parallel of N layer step 702 to the described load balance handling process of step 710, like this, guaranteed load monitoring is carried out in each sub-district in each layer, and when certain cell load is overweight with the load allocating of this sub-district to its upper strata or underlay cell, to realize load balance.
In addition, in the step 704 of present embodiment, check the last layer sub-district that the overlay cell loading condition is not limited to the cell-of-origin, but all overlay cell of cell-of-origin are all checked, again the select target sub-district; And if do not have overlay cell to meet the condition of checking also can to change step 709 pair underlay cell over to and select.Therefore, the cell-of-origin had been in toply also might have found suitable Target cell to share its load, the part low speed user of cell-of-origin had been switched away.That is to say that present embodiment has further enlarged the scope of balanced source cell load, increased, thereby make system high efficiency realize load balance the possibility of cell-of-origin load allocating to other sub-district.
By the described embodiment of Fig. 7 as seen, use present embodiment and can realize the load balance of each layer minizone, and can satisfy in the layered cell structure for user's scheduling requirement between the different layers sub-district.
In sum as seen, use three embodiment of the inventive method, all can make the system of layered cell structure realize load balance, and the user that can satisfy between the different layers sub-district dispatches needs, thereby make systematic function obtain efficient optimization.
Claims (11)
1. the balancing method of loads in the layered cell structure is characterized in that treatment step is as follows:
A. for all sub-districts in the layered cell structure load target value and load surplus are set;
B. the network equipment is monitored the current load level in all sub-districts, and has judged whether its load target value of cell load horizontal exceeding, if having, with this sub-district as the cell-of-origin, execution in step c; Otherwise continue execution in step b;
C. judge the load difference that in all overlay cell that cover the cell-of-origin whether the sub-district is arranged greater than the load surplus, if having, execution in step d; Otherwise return step b; Described load difference is that the load target value of this sub-district deducts the difference that its load level obtains;
D. in the sub-district that meets the described condition of step c by predetermined principle select target sub-district, and in the cell-of-origin, select the fastest user of translational speed as switching the user;
E. will switch the user and switch to selected Target cell.
2. method according to claim 1, it is characterized in that, described step a is, for the sub-district that is in the same level is provided with identical load target value and load surplus, for the sub-district that is in different levels is provided with identical load target value and load surplus, for the sub-district that is in different levels is provided with different load target value and identical load surplus, for the sub-district that is in different levels is provided with identical load target value and different load surpluses, perhaps, for the sub-district that is in different levels different load target value and different load surpluses are set.
3. method according to claim 1 and 2 is characterized in that, all overlay cell described in the step c are all last layer sub-districts.
4. method according to claim 1 is characterized in that, in the steps d, described predetermined principle is to select any one sub-district as Target cell in the described qualified sub-district of step c.
5. method according to claim 1 is characterized in that, in the steps d, described predetermined principle is to select the minimum sub-district of load as Target cell in the described qualified sub-district of step c.
6. method according to claim 1 and 2 is characterized in that, among the step c, the load difference that does not have the sub-district in judging all overlay cell that cover the cell-of-origin also further comprises step during greater than the load surplus:
A1. in the cell-of-origin, select the slowest user of translational speed as the switching user, and the underlay cell that the cell-of-origin covers is carried out signal measurement by this user;
B1. judge whether in steps according to the signal measurement result that the described underlay cell of a1 can insert and switch the user, if, by predetermined principle select to insert switch the user the sub-district as Target cell, change step e again over to; Otherwise return step b.
7. method according to claim 6 is characterized in that, described predetermined principle is to select any one sub-district as Target cell in can inserting the sub-district of switching the user.
8. method according to claim 6 is characterized in that, described predetermined principle is to select a best sub-district of signal as Target cell in can inserting the sub-district of switching the user.
9. method according to claim 1 is characterized in that, in the steps d, described predetermined principle is, in step c in qualified all sub-districts, any one sub-district of sub-district of selecting to be arranged in lowermost layer is as Target cell.
10. method according to claim 1 is characterized in that, in the steps d, described predetermined principle is, in step c in qualified all sub-districts, selects to be arranged in the minimum sub-district of the load of sub-district of lowermost layer as Target cell.
11. method according to claim 1 is characterized in that, among the step e, described the user is switched to after the Target cell, also further comprises, returns step b.
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