CN102857970B - The implementation method and device of a kind of inter-cell load balance - Google Patents
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
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- H04W28/086—Load balancing or load distribution among access entities
- H04W28/0861—Load balancing or load distribution among access entities between base stations
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- H—ELECTRICITY
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/08—Load balancing or load distribution
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Abstract
The invention discloses a kind of implementation method of inter-cell load balance, the method includes：It is determined that after needing to carry out load balance, base station determines the average value of the current information on load in all neighbor cells；According to the average value of the information on load and itself current information on load, it is determined that performing load balancing (LB) operation or mobility load balance (MLB) operation.Device is realized the present invention discloses a kind of inter-cell load balance, using the method for the present invention and device, can be according to the actual conditions of base station present load, effectively realize load balance, so as to both can guarantee that the success rate of switching, moreover it is possible in overload, rapidly realize load balance.
Description
Technical Field
The present invention relates to Long Term Evolution (LTE) technologies, and in particular, to a method and an apparatus for implementing inter-cell load balancing in an LTE system.
Background
The LTE system is a resource-limited system, the resource of each cell is limited, the load of the cell will gradually increase with the increase of the number of users and the number of services, and the increase of the load of the cell will affect the performance of the index of the user services, if the load of the cell cannot be effectively reduced in time, when the load of the system increases to the warning line of the system, the performance of the system will be rapidly deteriorated, and even the system will be crashed, which is mainly expressed as: low access success rate, low handover success rate, too high downlink power load, large interference between adjacent zones, and the like. Therefore, in order to make the load of each cell in a certain area within one horizontal line, thereby making the system more stable and efficient, it is necessary to balance the load between cells.
At present, in an LTE system, a method for implementing load balancing between cells mainly includes: load Balancing (LB) and Mobile Load Balancing (MLB) techniques. The task of the LB technology is to handle imbalance of traffic among multiple cells, and specifically, to implement traffic flow from a high-load cell to a low-load cell by using a cell switching or reselecting, so as to maintain a high utilization rate of radio resources, maintain a high quality of service to a certain extent, and effectively reduce the probability of a dropped call rate; the MLB technology, as a Self-optimization function in a Self-Organized Network (SON), mainly optimizes mobility parameters by automatic optimization, that is: and the cell reselection parameters or the switching parameters transfer part of the services of the cell with higher load to the adjacent cell with lower load, so that the uniform distribution of the load among the cells is realized, the system capacity is further improved, and the interference of manual network management is reduced.
Whether the technology is LB technology or MLB technology, the current load information of the adjacent area is used as an input condition to judge, and the current load information of the adjacent area of the LTE system is carried in an X2 port message to be transmitted; wherein the current load information includes: the method comprises the steps of obtaining current wireless resource utilization rate, current hardware load information, current transmission load indication information, available uplink and downlink comprehensive capacity information and uplink and downlink capacity grade indication information of a cell. Wherein the current radio resource utilization comprises: physical Resource Block (GBR PRB) utilization Rate of uplink and downlink Guaranteed Rate services, Physical Resource Block (non-GBR PRB) utilization Rate of uplink and downlink non-Guaranteed Rate services, and Physical Resource Block (PRB) utilization Rate of uplink and downlink total; the current hardware load information includes: uplink and downlink hardware load information; the current transmission load indication information includes: and uplink and downlink transmission load information. The output of the LB technology is User Equipment (UE) and a candidate handover cell that need to be handed over, and the output of the MLB technology is a modified handover parameter or reselection parameter, that is, in the LB technology, an evolved nodeb (eNB) issues a command to the UE to handover to a corresponding candidate handover cell, and in the MLB technology, the eNB issues the modified handover parameter or reselection parameter to the UE.
For the LB technique, since the UE directly performs handover after receiving the command, the LB technique can quickly achieve load balancing, but during handover, since the UE cannot know the signal quality of the corresponding candidate handover cell, the handover achieved by the LB technique is blind handover, and the success rate of the handover cannot be guaranteed; for the MLB technique, since the eNB issues the modified handover parameter or reselection parameter to the UE, at this time, the UE performs handover based on measurement, and in this case, the UE can acquire the signal quality of the candidate handover cell, so the success rate of handover can be ensured, but since the UE needs to perform handover based on measurement, the effect of implementing load balancing by the MLB technique is slow.
In summary, in the existing technical solutions for implementing load balancing between cells, some solutions have a drawback of low handover success rate, and some solutions have a drawback of slow effect of implementing load balancing.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for implementing load balancing between cells, which can effectively implement load balancing according to the actual situation of the current load of the base station.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for realizing load balance among cells, which comprises the following steps:
after determining that load balancing is needed, the base station determines the average value of the current load information of all adjacent cells;
and determining to execute LB operation or MLB operation according to the average value of the load information and the current load information of the load information.
In the foregoing solution, when determining an average value of current load information of all neighboring cells, the method further includes:
and acquiring the current load information of all the adjacent cells.
In the above scheme, the obtaining of the current load information of all neighboring cells includes:
and acquiring the current load information of all adjacent cells through a RESOURCE STATUS UPDATE (RESOURCE STATUS UPDATE) message of an X2 port.
In the above scheme, the load information is radio resource utilization rate, or hardware load information, or transmission load indication information.
In the foregoing solution, the radio resource utilization includes: the utilization rate of uplink and downlink GBR PRB and the utilization rate of uplink and downlink non-GBRPRB.
In the above solution, determining to execute the LB operation or the MLB operation according to the average value of the load information and the current load information of the load information is:
and judging whether the square of the difference value between the average value of the load information and the current load information of the load information is smaller than a preset threshold value or not, and executing LB operation or MLB operation according to the judgment result.
In the foregoing solution, the executing the LB operation or the MLB operation according to the determination result is:
and if the square of the difference value between the average value of the load information and the current load information is less than a preset threshold value, executing MLB operation, and if the square of the difference value between the average value of the load information and the current load information is more than or equal to the preset threshold value, executing LB operation.
The invention also provides a device for realizing load balance among cells, which comprises: a determining unit and an executing unit; wherein,
the determining unit is used for determining the average value of the current load information of all the adjacent cells after determining that the load balance is needed, and sending the determined average value to the executing unit;
and the execution unit is used for determining to execute the LB operation or the MLB operation according to the average value of the load information and the current load information of the execution unit after receiving the determined average value sent by the determination unit.
In the above scheme, the apparatus further comprises:
the acquiring unit is used for acquiring the current load information of all the adjacent cells and sending the acquired current load information of all the adjacent cells to the determining unit;
and the determining unit is further configured to receive the current load information of all the neighboring cells sent by the obtaining unit.
In the foregoing solution, the execution unit is specifically configured to:
and judging whether the square of the difference value between the average value of the load information and the current load information of the load information is smaller than a preset threshold value or not, and executing LB operation or MLB operation according to the judgment result.
According to the method and the device for realizing load balance among cells, the base station needing load balance determines to execute LB operation or MLB operation according to the average value of the load information and the current load information of the base station, namely: and when the base station determines that the current load is high load according to the average value of the load information and the current load information, executing MLB operation, and when the base station determines that the current load is overload according to the average value of the load information and the current load information, executing LB operation.
Drawings
FIG. 1 is a flow chart of a method for implementing load balancing among cells according to the present invention;
fig. 2 is a flowchart illustrating a method for implementing load balancing between cells according to an embodiment;
FIG. 3 is a flowchart illustrating a method for implementing load balancing between cells according to a second embodiment;
fig. 4 is a schematic flowchart of a method for implementing load balancing between three cells according to an embodiment;
fig. 5 is a schematic structural diagram of an apparatus for implementing load balancing between cells according to the present invention.
Detailed Description
The basic idea of the invention is: after determining that load balancing is needed, the base station determines the average value of the current load information of all adjacent cells; and determining to execute LB operation or MLB operation according to the average value of the load information and the current load information of the load information.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The method for realizing load balance among cells, as shown in fig. 1, includes the following steps:
step 101: after determining that load balancing is needed, the base station acquires current load information of all adjacent cells;
here, the base station may specifically be an eNB;
the base station acquiring the current load information of all the adjacent cells means that: a base station acquires current load information of all adjacent cells of the base station;
the acquiring current load information of all neighboring cells specifically includes:
acquiring current load information of all adjacent cells through a RESOURCE STATUS UPDATE message of an X2 port;
all adjacent cells are configured on a base station in advance, so that all adjacent cells can be known, and current load information of all adjacent cells can be acquired through a RESOURCE STATUS UPDATE message of an X2 port;
the load information may specifically be: radio resource utilization, hardware load information, or transmission load indication information.
Step 102: the average of the current load information of all neighboring cells is determined.
Step 103: the base station determines to execute LB operation or MLB operation according to the average value of the load information and the current load information of the base station;
specifically, the base station judges whether the square of the difference between the average value of the load information and the current load information of the base station is smaller than a preset threshold value, and executes LB operation or MLB operation according to the judgment result;
setting the size of the threshold value according to the requirement;
the executing the LB operation or the MLB operation according to the determination result specifically includes:
executing MLB operation if the square of the difference between the average value of the load information and the current load information is less than a preset threshold value, and executing LB operation if the square of the difference between the average value of the load information and the current load information is more than or equal to the preset threshold value;
here, the specific processing procedures for performing the MLB operation and performing the LB operation are prior art, and are not described herein again.
The present invention will be described in further detail with reference to examples.
The first embodiment is as follows:
the application scenario of this embodiment is as follows: the eNB acquires the current radio RESOURCE utilization rates of all neighboring cells through the RESOURCE STATUS UPDATE message of X2, that is: the load information is radio resource utilization. The method for implementing load balancing among cells in this embodiment, as shown in fig. 2, includes the following steps:
step 201: after determining that load balancing is needed, the eNB acquires the current wireless resource utilization rate of all adjacent cells through RESOURCESTATUS UPDATE information of an X2 port;
here, the radio resource utilization ratio includes: the utilization rate of uplink and downlink GBR PRBs and the utilization rate of uplink and downlink non-GBR PRBs; the radio resource utilization may further include: the total PRB utilization rate of the uplink and the downlink.
Step 202: the eNB determines the average value of the current wireless resource utilization rates of all adjacent cells;
specifically, the current radio resource utilization rate of each neighboring cell is determined by using formula (1):
RbLoadir1 × (uplink GBR PRB utilization)i+ r2 × (downlink GBR PRB utilization)i+ r3 × (uplink non-GBR PRB utilization)i+ r4 × (downstream non-GBR PRB utilization)i(1)
Then, the average value of the current radio resource utilization rates of all the adjacent cells is determined by adopting the formula (2):
RbLoadAver＝(RbLoad1+RbLoad2+..+RbLoadn)/n (2)
where i denotes the ith neighbor cell, RbLoad, of all neighbor cellsiThe current wireless resource utilization rate of the ith adjacent cell is shown, n represents the total n adjacent cells, RbLoadAverRepresents the average of the current radio resource utilization of all neighboring cells, i.e.: the average value of the current radio resource utilization rates of n adjacent cells, r1+ r2+ r3+ r4 is 1, and r1, r2, r3 and r4 represent radio load weight coefficients; in practical application, the values of r1, r2, r3 and r4 can be determined according to simulation results; the specific procedures for determining the values of r1, r2, r3, and r4 from the simulation results are routine to those skilled in the art;
when the radio resource utilization further includes the total uplink and downlink PRB utilization, the above method may also be used to determine the average value of the current radio resource utilization of all neighboring cells, that is: and determining the average value of the current wireless resource utilization rate of all adjacent cells by only utilizing the utilization rate of the uplink GBR PRB and the downlink non-GBR PRB.
Step 203: judging whether the formula is satisfied: (RbLoad)Aver-RbLaod)2< RbTh, if yes, go to step 204, otherwise, go to step 205;
here, the formula is expressed in language as: the square of the difference between the average value of the current wireless resource utilization rates of all the adjacent cells and the current wireless resource utilization rate of the eNB is smaller than a preset threshold value, wherein RbLaod represents the current wireless resource utilization rate of the eNB, and RbTh represents the preset threshold value; the value of RbLaod is determined using equation (1), i.e.: the method for determining the current wireless resource utilization rate of the eNB is the same as the method for determining the current wireless resource utilization rate of each adjacent cell;
if so (RbLoad)Aver-RbLaod)2If < RbTh, it indicates that the current load of the eNB needs to be load balanced, but the load has not reached the set overload threshold, that is: the UE does not need to be switched immediately, and the switching can be carried out through MLB operation; if not (RbLoad)Aver-RbLaod)2If the load is less than RbTh, the current load of the eNB needs to be load balanced, and the load reaches the set overload threshold value, that is: the UE is required to perform handover immediately, and the handover may be performed through an LB operation.
Step 204: an MLB operation is performed.
Step 205: the LB operation is performed.
Example two:
the application scenario of this embodiment is as follows: the eNB acquires the current hardware load information of all the neighboring cells through the RESOURCE STATUS UPDATE message of X2, that is: the load information is hardware load information. The method for implementing load balancing among cells in this embodiment, as shown in fig. 3, includes the following steps:
step 301: after determining that load balancing is needed, the eNB acquires the current hardware load information of all adjacent cells through RESOURCESTATUS UPDATE information of an X2 port;
here, the hardware load information includes: uplink hardware load information and downlink hardware load information.
Step 302: the eNB determines the average value of the current hardware load information of all adjacent cells;
specifically, the current hardware load information of each neighboring cell is determined by using formula (3):
HwLoadih1 × (uplink hardware load information)i+ h2 × (downstream hardware load information)i(3)
Then, the average value of the current hardware load information of all the adjacent cells is determined by adopting the formula (4):
HwLoadAver＝(HwLoad1+HwLoad2+..+HwLoadn)/n (4)
where i denotes the ith neighbor cell among all neighbor cells, HwLoadiRepresenting the current hardware load information of the ith adjacent cell; n represents a total of n neighboring cells; HwLoadAverThe average value of the hardware load information representing the current of all neighboring cells, namely: the average value of the current hardware load information of n adjacent cells, h1+ h2 is 1, and h1 and h2 represent hardware load weight coefficients; in practical application, the values of h1 and h2 can be determined according to simulation results; the specific process of determining the values of h1 and h2 from the simulation results is routine to those skilled in the art.
Step 303: judging whether the formula is satisfied: (HwLoad)Aver-HwLaod)2< HwTh, if yes, go to step 304, otherwise, go to step 305;
here, the formula is expressed in language as: the square of the difference between the average value of the current hardware load information of all the adjacent cells and the current hardware load information of the eNB is smaller than a preset threshold value, wherein HwLaod represents the current hardware load information of the eNB, and HwTh represents the preset threshold value; wherein, the value of HwLaod is determined by formula (3), i.e.: the method for determining the current hardware load information of the eNB is the same as the method for determining the current hardware load information of each adjacent cell;
if so (HwLoad)Aver-HwLaod)2If < HwTh, it indicates that the current load of the eNB needs to be load balanced, but the load has not yet reached the set overload threshold, that is: the UE does not need to be switched immediately, and the switching can be carried out through MLB operation; if not (HwLoad)Aver-HwLaod)2If the load is less than HwTh, it indicates that the current load of the eNB needs to be load balanced, and the load has reached the set overload threshold, that is: the UE is required to perform handover immediately, and the handover may be performed through an LB operation.
Step 304: performing an MLB operation;
step 305: the LB operation is performed.
Example three:
the application scenario of this embodiment is as follows: the eNB acquires the current transmission load indication information of all the neighboring cells through the RESOURCE STATUS UPDATE message of X2, that is: the load information is transmission load indication information. The method for implementing load balancing among cells in this embodiment, as shown in fig. 4, includes the following steps:
step 401: after determining that load balancing is needed, the eNB acquires current transmission load indication information of all adjacent cells through RESOURCESTATUS UPDATE information of an X2 port;
here, the transmission load indication information includes: uplink transmission load indication information and downlink transmission load indication information.
Step 402: the eNB determines the average value of the current transmission load indication information of all adjacent cells;
specifically, the current transmission load indication information of each neighboring cell is determined by using formula (5):
Tn1Loadit1 × (uplink transmission load indication information)i+ t2 × (Downlink load indication information)i(5)
Then, the average value of the current transmission load indication information of all the adjacent cells is determined by adopting the formula (6):
Tn1LoadAver＝(Tn1Load1+Tn1Load2+..+Tn1Loadn)/n (6)
where i denotes the ith neighbor cell of all neighbor cells, Tn1LoadiIndicating the current transmission Load indication information of the ith adjacent cell, n indicating the total n adjacent cells, Tn1LoadAverTo representThe average value of the current transmission load indication information of all the adjacent cells is as follows: the average value of the current transmission load indication information of the n adjacent cells, t1+ t2 is 1, and t1 and t2 represent transmission load weight coefficients; in practical application, the values of t1 and t2 can be determined according to simulation results; the specific process of determining the values of t1 and t2 from the simulation results is routine to those skilled in the art.
Step 403: judging whether the formula is satisfied: (Tn1 Load)Aver-Tn1Laod)2< Tn1Th, if yes, go to step 404, otherwise, go to step 405;
here, the formula is expressed in language as: the square of the difference between the average value of the current transmission load indication information of all the adjacent cells and the current transmission load indication information of the eNB is smaller than a preset threshold value, wherein Tn1 door represents the current transmission load indication information of the eNB, and Tn1Th represents the preset threshold value; the value of Tn1Laod is determined using equation (5), i.e.: the method for determining the current transmission load indication information of the eNB is the same as the method for determining the current transmission load indication information of each adjacent cell;
if it satisfies (Tn1 Load)Aver-Tn1Laod)2< Tn1Th, it indicates that the current load of eNB needs to be load balanced, but the load has not reached the set overload threshold, i.e.: the UE does not need to be switched immediately, and the switching can be carried out through MLB operation; if not (Tn1 Load)Aver-Tn1Laod)2< Tn1Th, it indicates that the current load of eNB needs to be load balanced and the load has reached the set overload threshold, i.e.: the UE is required to perform handover immediately, and the handover may be performed through an LB operation.
Step 404: performing an MLB operation;
step 405: the LB operation is performed.
In order to implement the above method, the present invention further provides an apparatus for implementing load balancing between cells, as shown in fig. 5, the apparatus includes: a determination unit 51 and an execution unit 52; wherein,
the determining unit 51 determines the average value of the current load information of all the adjacent cells after determining that load balancing is needed, and sends the determined average value to the executing unit 52;
and the executing unit 52 is configured to determine to execute the LB operation or the MLB operation according to the average value of the load information and the current load information of the executing unit after receiving the determined average value sent by the determining unit.
Wherein, the device can also further include: an obtaining unit, configured to obtain current load information of all neighboring cells, and send the obtained current load information of all neighboring cells to the determining unit 51;
the determining unit 51 is further configured to receive the current load information of all neighboring cells sent by the obtaining unit.
The obtaining unit is specifically configured to:
and acquiring the current load information of all adjacent cells through a RESOURCE STATUS UPDATE message of an X2 port.
The execution unit 52 is specifically configured to:
and judging whether the square of the difference value between the average value of the load information and the current load information of the load information is smaller than a preset threshold value or not, and executing LB operation or MLB operation according to the judgment result.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (9)
1. A method for implementing load balancing among cells is characterized in that the method comprises the following steps:
after determining that load balancing is needed, the base station determines the average value of the current load information of all adjacent cells;
and judging whether the square of the difference value between the average value of the load information and the current load information is smaller than a preset threshold value or not according to the average value of the load information and the current load information, if so, executing Mobile Load Balancing (MLB) operation, and if not, executing Load Balancing (LB) operation.
2. The method of claim 1, wherein in determining the average of the current load information of all neighboring cells, the method further comprises:
and acquiring the current load information of all the adjacent cells.
3. The method according to claim 2, wherein the obtaining current load information of all neighboring cells comprises:
and acquiring the current load information of all the adjacent cells through the resource state updating message of the X2 port.
4. The method of claim 1, wherein the load information is radio resource utilization, hardware load information, or transmission load indication information.
5. The method of claim 4, wherein the radio resource utilization comprises: the physical resource block (GBR PRB) utilization rate of the uplink and downlink guaranteed rate services, and the physical resource block (non-GBRPRB) utilization rate of the uplink and downlink non-guaranteed rate services.
6. An apparatus for implementing load balancing between cells, the apparatus comprising: a determining unit and an executing unit; wherein,
the determining unit is used for determining the average value of the current load information of all the adjacent cells after determining that the load balance is needed, and sending the determined average value to the executing unit;
and the execution unit is used for judging whether the square of the difference value between the average value of the load information and the current load information is smaller than a preset threshold value or not according to the average value of the load information and the current load information, executing MLB operation if the square of the difference value between the average value of the load information and the current load information is smaller than the preset threshold value, and executing LB operation if the square of the difference value between the average value of the load information and the current load information is larger than or equal to the preset threshold value.
7. The apparatus of claim 6, further comprising:
the acquiring unit is used for acquiring the current load information of all the adjacent cells and sending the acquired current load information of all the adjacent cells to the determining unit;
and the determining unit is further configured to receive the current load information of all the neighboring cells sent by the obtaining unit.
8. The apparatus of claim 6, wherein the load information is radio resource utilization, or hardware load information, or transmission load indication information.
9. The apparatus of claim 8, wherein the radio resource utilization comprises: the utilization rate of the uplink GBR PRB and the utilization rate of the uplink non-GBR PRB and the downlink non-GBR PRB.
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| PCT/CN2011/081454 WO2013000225A1 (en) | 2011-06-28 | 2011-10-27 | Method and apparatus for realizing load balancing among cells |
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| CN104105135B (en) * | 2013-04-02 | 2019-02-01 | 电信科学技术研究院 | A kind of mobility load balance, utilization rate of air interface resource statistical method and equipment |
| US9693262B2 (en) * | 2013-06-13 | 2017-06-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Load sharing in cellular networks |
| TWI572221B (en) * | 2014-12-01 | 2017-02-21 | 財團法人資訊工業策進會 | Central control server and load balancing method thereof |
| CN104918287B (en) * | 2015-06-15 | 2018-09-25 | 厦门大学 | A kind of method and device of load balancing |
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| CN107872825B (en) * | 2016-09-23 | 2022-09-13 | 中兴通讯股份有限公司 | Load balancing method and device, and base station |
| CN107124739B (en) * | 2017-04-14 | 2020-06-23 | 京信通信系统（中国）有限公司 | Load balancing method and device |
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| CN101686497B (en) * | 2008-09-24 | 2013-04-17 | 华为技术有限公司 | Cell load equalization method, and cell load evaluation method and device |
| CN101765153A (en) * | 2008-12-25 | 2010-06-30 | 中兴通讯股份有限公司 | Method and system for realizing load balance |
| CN101965012B (en) * | 2009-07-22 | 2014-08-13 | 中兴通讯股份有限公司 | Load balancing method and device |
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| CN102098728A (en) * | 2011-01-05 | 2011-06-15 | 北京邮电大学 | Mobile load balancing method |
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