CN108260166B - Load balancing method and device - Google Patents
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The embodiment of the invention provides a load balancing method and a device, wherein the load balancing method comprises the following steps: if receiving a high load state notification message from a serving cell, modifying a default value corresponding to an individualized offset parameter OCN of a target cell, wherein the target cell and the serving cell are adjacent cells, and the high load state notification message is sent to the target cell by the serving cell when the serving cell is detected to be in a high load state; and configuring the modified OCN to a new access user and/or a switching-in user, wherein the switching-in user is a user balanced to a target cell by a service cell. Therefore, the load balancing effect, the user perception and the network service quality are effectively improved.
Description
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a load balancing method and device.
Background
In the current mobile communication network, a TD-LTE (Time Division Long Term Evolution) network is developed rapidly, and in order to meet the requirement of rapidly increasing number of customers and gradually increasing service quality, an operator adopts a deployment strategy of simultaneous coverage of two-layer or even multi-layer networks. For example: in a network with double-layer coverage of the F frequency band and the D frequency band in china mobile, due to the difference of propagation characteristics, the F frequency band has the advantage of a wider coverage range than the D frequency band, but the frequency resources of the F frequency band are less than those of the D frequency band. And the D frequency band has frequency resource advantages, so that the aims of ensuring coverage through the F frequency band at the edge region, sharing load through the D frequency band at the central region and absorbing capacity can be achieved. In a scenario where two cells of an F + D dual-layer (or dual-layer D or dual-layer F) network are covered at the same time, in order to achieve efficient utilization of network resources of the two cells and optimal overall throughput, an algorithm for load balancing, such as a load balancing algorithm based on the number of users of the cells, a service load and a hardware CPU (Central Processing Unit) load, needs to balance part of users of a high-load cell to a low-load cell.
When the number of users, the service load or the load of a hardware CPU of a cell covered by the cell reaches a set threshold value, the cell is considered to be in a high load state, and at the moment, if other cells covered by the cell together with the cell are in a low load state, a load balancing algorithm is triggered, and partial users are selected from the high load cell to be switched and balanced to the low load cell.
In order to prevent ping-pong handover between handover based on load balancing and handover based on coverage, that is, after a user in a high load cell is balanced to a low load cell, handover back to the high load cell is performed immediately after meeting a handover condition based on coverage, therefore, in the low load cell, the prior art measures a5 of a user configuration switched based on load balancing to inhibit the handover back to the high load cell, and sets an inhibition time, and when the inhibition time is exceeded, the measurement of the inhibited a5 is replaced by the measurement based on the original coverage configuration, which may be A3 or a4 measurement.
However, the prior art embodiments have the following drawbacks:
1) by adopting the suppression strategy in the embodiment of the prior art, if a new access user exists in a low-load cell, the new access user may be quickly switched to the high-load cell after being accessed, so that the load of the high-load cell cannot be timely and effectively reduced, the load balancing effect is poor, and the customer perception and the network service quality are affected.
2) In the existing scheme, only the suppression strategy of the same-coverage neighbor cell is considered, so that the UE under the neighbor cell (the neighbor cell under the single-layer network) under the non-same coverage can be continuously switched to the high-load neighbor cell, the load balancing effect is also influenced, and the user perception and the network service quality are reduced.
3) The above two problems lead to an increase in the number of switches, and risk exists for KPI (Key Performance Indicator) indicators.
In view of the above technical problems, no effective solution has been proposed at present.
Disclosure of Invention
In order to solve the above problem, the present invention discloses a load balancing method, which is applied to a target cell, and the method includes:
if receiving a high load state notification message from a serving cell, modifying a default value corresponding to an individualized offset parameter OCN of a target cell, wherein the target cell and the serving cell are adjacent cells, and the high load state notification message is sent to the target cell by the serving cell when the serving cell is detected to be in a high load state;
and configuring the modified OCN to a new access user and/or a switching-in user, wherein the switching-in user is a user balanced to a target cell by a service cell.
In a preferred embodiment of the present invention, the step of modifying the personalized offset parameter OCN of the target cell itself specifically includes:
and modifying the OCN according to the preset range and the measurement type configured for the accessed user by the target cell.
In a preferred embodiment of the present invention, the step of modifying the personalized offset parameter OCN of the target cell itself specifically includes:
acquiring a trigger condition corresponding to the measurement type, wherein the trigger condition comprises a corresponding relation between the OCN and a specified threshold;
and modifying the OCN according to the preset range and the triggering condition so as to inhibit the triggering of the triggering condition.
In a preferred embodiment of the present invention, after the step of configuring the modified OCN to the new access subscriber and/or the handover access subscriber, the method further includes:
and if a non-high load state notification message from the service cell is received, modifying the modified OCN into a default value.
In a preferred embodiment of the invention, the method further comprises:
and configuring the default value to a new access user and/or a cut-in user after the OCN is modified to the default value.
In a preferred embodiment of the present invention, the serving cell and the target cell belong to the same base station or different base stations.
According to another aspect of the present invention, there is provided a load balancing apparatus applied to a target cell, the apparatus including:
a modification module, configured to modify a default value corresponding to an individual offset parameter OCN of a target cell if a high load state notification message from a serving cell is received, where the target cell and the serving cell are neighboring cells, and the high load state notification message is sent to the target cell by the serving cell when the serving cell detects that the serving cell is in a high load state;
and the configuration module is used for configuring the modified OCN to a new access user and/or a switched-in user, wherein the switched-in user is a user balanced to a target cell from a service cell.
In a preferred embodiment of the present invention, the modifying module is further configured to modify the OCN according to the predetermined range and the measurement type configured by the target cell for the accessed subscriber.
In a preferred embodiment of the present invention, the modification module is further configured to:
acquiring a trigger condition corresponding to the measurement type, wherein the trigger condition comprises a corresponding relation between the OCN and a specified threshold;
and modifying the OCN according to the preset range and the triggering condition so as to inhibit the triggering of the triggering condition.
In a preferred embodiment of the present invention, the modifying module is further configured to modify the modified OCN to a default value if a non-high load status notification message is received from the serving cell.
In a preferred embodiment of the present invention, the configuration module is further configured to configure the default value to a new access user and/or a hand-in user whose OCN is modified to the default value.
In a preferred embodiment of the present invention, the serving cell and the target cell belong to the same base station or different base stations.
Compared with the prior art, the method comprises the steps that if a high-load state notification message from a serving cell is received, a default value corresponding to the personalized offset parameter OCN of the target cell is modified, wherein the target cell and the serving cell are adjacent cells, and the high-load state notification message is sent to the target cell by the serving cell when the serving cell is detected to be in the high-load state; and configuring the modified OCN to a new access user and/or a switching-in user, wherein the switching-in user is a user balanced to a target cell by a service cell. Therefore, the load balancing effect, the user perception and the network service quality are effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a flow chart of a load balancing method according to an embodiment of the present invention;
fig. 2 is a flowchart of a process of a high-load cell in an embodiment of the present invention;
FIG. 3 is a schematic diagram of data interaction in an embodiment of the invention;
fig. 4 is a process flow diagram of a target cell in an embodiment of the invention;
FIG. 5 is a diagram illustrating configuration definitions in an embodiment of the present invention;
fig. 6 is a block diagram of a load balancing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a flowchart of a load balancing method according to an embodiment of the present invention is shown, where the method is applied to a target cell, and specifically includes the following steps:
Specifically, in the embodiment of the present invention, when the serving cell detects that it is in a high load state, it detects whether there is a neighboring cell with the same coverage and/or different coverage around the serving cell, that is, a target cell. And if so, sending a high load state notification message to the target cell to notify that the current service cell of the adjacent cell is in the high load state.
And the target cell receives a high-load state notification message from the service cell, and modifies a default value corresponding to the personalized offset parameter OCN according to the notification message. In one embodiment of the invention, the default value is 0 dB. The target cell can suppress the triggering probability of the measurement event by making the OCN value larger or smaller.
And 102, configuring the modified OCN to a new access user and/or a switching-in user, wherein the switching-in user is a user balanced to a target cell from a serving cell.
Specifically, in the embodiment of the present invention, the target cell configures the modified OCN to a new access user and/or a handover access user. The switched-in user is a user of which the serving cell is balanced to the target cell according to a load balancing method in the prior art.
In summary, in the technical solution in the embodiment of the present invention, if a high load state notification message from a serving cell is received, a default value corresponding to an individualized offset parameter OCN of a target cell is modified, where the target cell and the serving cell are neighboring cells, and the high load state notification message is sent to the target cell by the serving cell when the serving cell detects that the serving cell is in a high load state; and configuring the modified OCN to a new access user and/or a switching-in user, wherein the switching-in user is a user balanced to a target cell by a service cell. Therefore, the load balancing effect, the user perception and the network service quality are effectively improved.
In addition, in a preferred embodiment of the present invention, the step of modifying the personalized offset parameter OCN of the target cell itself specifically includes:
and modifying the OCN according to the preset range and the measurement type configured for the accessed user by the target cell.
In a preferred embodiment of the present invention, the step of modifying the personalized offset parameter OCN of the target cell itself specifically includes:
acquiring a trigger condition corresponding to the measurement type, wherein the trigger condition comprises a corresponding relation between the OCN and a specified threshold;
and modifying the OCN according to the preset range and the triggering condition so as to inhibit the triggering of the triggering condition.
In a preferred embodiment of the present invention, after the step of configuring the modified OCN to the new access subscriber and/or the handover access subscriber, the method further includes:
and if a non-high load state notification message from the service cell is received, modifying the modified OCN into a default value.
In a preferred embodiment of the invention, the method further comprises:
and configuring the default value to a new access user and/or a cut-in user after the OCN is modified to the default value.
In a preferred embodiment of the present invention, the serving cell and the target cell belong to the same base station or different base stations.
In order to make the load balancing method of the present invention better understood by those skilled in the art, the following detailed description is made with reference to specific embodiments.
Fig. 2 is a flowchart illustrating a process of a high-load cell (i.e. a serving cell in the embodiment of the present invention), where in fig. 2:
a serving cell belonging module (hereinafter referred to as a serving module) detects whether a current serving cell is in a high load state according to a predetermined load balancing cycle. After the balancing period is overtime, that is, when the triggering time of the determination period is reached, if the serving cell is in a high-load state, the serving module detects whether a neighboring cell (a target cell in the embodiment of the present invention) exists around the serving cell. The adjacent cell may be an intra-station adjacent cell or an inter-station adjacent cell. That is, the serving cell and the target cell may belong to the same base station or may belong to different base stations.
In an embodiment of the present invention, if the serving cell and the target cell belong to intra-station neighboring cells, that is, if the serving module corresponding to the serving cell and the target module corresponding to the target cell belong to the same base station, the serving module informs the target module of the load state of the current serving cell through an internal interface message.
In another embodiment of the present invention, if the serving cell and the target cell belong to an inter-station neighboring cell, that is, the serving module corresponding to the serving cell and the target module corresponding to the target cell belong to different base stations, the base station where the serving cell is located and the base station where the target cell is located may exchange load states through an X2 message. As shown in fig. 3, in fig. 3:
the serving cell base station eNB1(Evolved NodeB) transmits a response STATUS REQUEST message to the target cell base station eNB2, where the Registration REQUEST field in the response STATUS REQUEST message is set to start. eNB2 receives the message and detects that the Registration Request field is set to start, it can confirm that the current serving cell is in a high load state. eNB2 adjusts the personalized offset parameter OCN for the target cell and returns a RESOURCE STATUS RESPONSE message to eNB 1.
If the serving cell is in a non-high load state, the serving cell detects whether an overload state notification message is sent before, if so, the serving cell sends a RESOURCE STATUS REQUEST message to the target cell again, wherein a Registration REQUEST field in the RESOURCE STATUS REQUEST message is set to stop. In one embodiment, if the serving cell and the target cell are intra-site neighboring cells, interaction is performed through the belonging modules.
In one embodiment, the RESOURCE STATUS REQUEST message is sent again if the serving cell does not receive a response message from the target cell within a predetermined time
In the embodiment of the present invention, as shown in fig. 4, a flowchart of processing of a target cell in the embodiment of the present invention is shown, where in fig. 4:
the target cell receives the high load state message sent by the neighboring cell (service cell) and adjusts the personalized offset parameter OCN of the target cell. Specifically, the target module corresponding to the target cell defines the configuration of the measurement object according to the 36.331 protocol, as shown in fig. 5, where cellindividualOffset is a parameter corresponding to ocn. The aim of modifying the ocn can be achieved by modifying cellindividualOffset.
After the parameters are modified, take the a4 measurement event as an example, that is, the target cell is currently configured for a4 measurement. The trigger conditions for the a4 measurement are:
Mn+Ofn+Ocn-Hys>Thresh
wherein, Mn is a Reference Signal Receiving Power (RSRP) or a Reference Signal Receiving Quality (RSRQ) of the neighbor cell measurement; ofn is the frequency offset corresponding to the adjacent cell; hys is amplitude hysteresis; thresh is the handover threshold.
In this embodiment, the value range of the OCN is: -24dB, -22dB, -20dB, -18dB, -16dB, -14dB, -12dB, -10dB, -8dB, -6dB, -5dB, -4dB, -3dB, -2dB, -1dB, 0dB, 1dB, 2dB, 3dB, 4dB, 5dB, 6dB, 8dB, 10dB, 12dB, 14dB, 16dB, 18dB, 20dB, 22dB, 24 dB.
In the embodiment of the present invention, the default value of the OCN is 0dB, and the target cell may suppress the trigger probability of the a4 measurement event by adjusting the size of the OCN. For example: adjusting the value of the OCN to-4 dB suppresses the probability of triggering an a4 measurement event. In one embodiment, the operator may adjust the OCN value multiple times to correct the degree of suppression of the a4 measurement event, depending on actual demand and the field environment.
With continued reference to fig. 4, the target cell configures the modified OCN to the new access subscriber and/or the handover access subscriber.
And if the target cell receives the message of the non-high load state, modifying the OCN to a default value, and configuring the default value to a user newly accessed later and a user switched in, wherein the offset value of the user with the modified OCN configured earlier is still kept unchanged.
In summary, the technical solution in the embodiment of the present invention has the following advantages:
1) the low-load cell actively switches and inhibits the high-load cell, so that the load balancing efficiency is improved;
2) the user perception is improved, and the overall capacity of the network can be improved;
3) the service quality of the user is improved;
4) and improving the KPI of the cell.
Referring to fig. 6, a block diagram of a load balancing apparatus according to an embodiment of the present invention is shown, where the apparatus is applied to a target cell, and specifically includes the following modules:
a modifying module 601, configured to modify a default value corresponding to the personalized offset parameter OCN of the target cell if a high load state notification message from the serving cell is received, where the target cell and the serving cell are neighboring cells, and the high load state notification message is sent to the target cell by the serving cell when the serving cell is detected to be in a high load state.
A configuring module 602, configured to configure the modified OCN to a new access user and/or a handover user, where the handover user is a user balanced from a serving cell to a target cell.
In a preferred embodiment of the present invention, the modifying module 601 is further configured to modify the OCN according to the predetermined range and the measurement type configured by the target cell for the accessed user.
In a preferred embodiment of the present invention, the modification module 601 is further configured to:
acquiring a trigger condition corresponding to the measurement type, wherein the trigger condition comprises a corresponding relation between the OCN and a specified threshold;
and modifying the OCN according to the preset range and the triggering condition so as to inhibit the triggering of the triggering condition.
In a preferred embodiment of the present invention, the modifying module 601 is further configured to modify the modified OCN to a default value if a non-high load status notification message is received from the serving cell.
In a preferred embodiment of the present invention, the configuration module 602 is further configured to configure a default value to a new access user and/or a hand-in user after the OCN is modified to the default value.
In a preferred embodiment of the present invention, the serving cell and the target cell belong to the same base station or different base stations.
In summary, the apparatus in the embodiment of the present invention modifies the default value corresponding to the personalized offset parameter OCN of the target cell itself if receiving the high load state notification message from the serving cell, where the target cell and the serving cell are neighboring cells, and the high load state notification message is sent to the target cell by the serving cell when detecting that the serving cell itself is in the high load state; and configuring the modified OCN to a new access user and/or a switching-in user, wherein the switching-in user is a user balanced to a target cell by a service cell. Therefore, the load balancing effect, the user perception and the network service quality are effectively improved.
For the apparatus embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Embodiments of the invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The load balancing method and apparatus provided by the present invention are introduced in detail, and a specific example is applied in the description to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A load balancing method applied to a target cell, the method comprising:
if a high load state notification message from a serving cell is received, modifying a default value corresponding to an individualized offset parameter OCN of the target cell, wherein the target cell and the serving cell are adjacent cells, and the high load state notification message is sent to the target cell by the serving cell when the serving cell is detected to be in a high load state;
configuring the modified OCN to a new access user and/or a switching-in user, wherein the switching-in user is a user balanced to the target cell by the serving cell;
the step of modifying the personalized offset parameter OCN of the target cell itself specifically includes:
modifying the OCN according to a preset range and a measurement type configured for an accessed user by the target cell;
if a non-high load state notification message from the service cell is received, modifying the modified OCN to the default value;
and configuring the default value to a new access user and/or a cut-in user after the OCN is modified to the default value, wherein the offset value of the user of which the modified OCN is configured before is still kept unchanged.
2. The method according to claim 1, wherein the step of modifying the personalized offset parameter OCN of the target cell itself specifically includes:
acquiring a trigger condition corresponding to the measurement type, wherein the trigger condition comprises a corresponding relation between the OCN and a specified threshold;
and modifying the OCN according to the preset range and the triggering condition so as to inhibit the triggering of the triggering condition.
3. The method of claim 1, wherein the serving cell and the target cell belong to a same base station or different base stations.
4. A load balancing apparatus applied to a target cell, the apparatus comprising:
a modification module, configured to modify a default value corresponding to an individualized offset parameter OCN of a target cell if a high load state notification message from a serving cell is received, where the target cell and the serving cell are neighboring cells, and the high load state notification message is sent to the target cell by the serving cell when the serving cell detects that the serving cell is in a high load state;
a configuration module, configured to configure the modified OCN to a new access user and/or a handover access user, where the handover access user is a user balanced from the serving cell to the target cell;
the modifying module is further configured to modify the OCN according to a predetermined range and a measurement type configured for an accessed user by the target cell;
the modifying module is further configured to modify the modified OCN to the default value if a non-high load state notification message from the serving cell is received;
the configuration module is further used for configuring the default value to a new access user and/or a cut-in user after the OCN is modified to the default value, wherein the offset value of the user of the OCN which is configured and modified before is still kept unchanged.
5. The apparatus of claim 4, wherein the modification module is further configured to:
acquiring a trigger condition corresponding to the measurement type, wherein the trigger condition comprises a corresponding relation between the OCN and a specified threshold;
and modifying the OCN according to the preset range and the triggering condition so as to inhibit the triggering of the triggering condition.
6. The apparatus of claim 4, wherein the serving cell and the target cell belong to the same base station or different base stations.
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| CN101959243A (en) * | 2009-07-17 | 2011-01-26 | 大唐移动通信设备有限公司 | Method and device for balancing load |
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