WO2013000248A1

WO2013000248A1 - Method and device for implementing cell reselection

Info

Publication number: WO2013000248A1
Application number: PCT/CN2011/083951
Authority: WO
Inventors: 晏智
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-06-29
Filing date: 2011-12-14
Publication date: 2013-01-03
Also published as: CN102857981A; CN102857981B

Abstract

The present invention provides a method and device for implementing cell reselection. The method comprises: a first controller determining a first target neighbor cell set according to a measurement report sent by a mobile station, the first target neighbor cell set being a set of target neighbor cells capable of being selected by the mobile station during cell reselection; the first controller selecting, from the first target neighbor cell set, a first target neighbor cell meeting a preset selection condition; and the first controller sending information of the first target neighbor cell to the mobile station, and the mobile station selecting the first target neighbor cell during cell reselection. According to the technical solution provided by the present invention, the success rate of cell reselection of the mobile station can be improved and the overall network load is balanced.

Description

Method and device for realizing cell reselection

The present invention relates to the field of communications technologies, and in particular, to a method and apparatus for implementing cell reselection. Background technique

Modern mobile communication systems are usually established in a cellular networking mode. The so-called cellular networking mode, that is, a plurality of regular hexagonal cells as a basic unit, combines and covers the entire service area to form a mobile communication network shaped like a cellular. When mobile stations (MS, Mobile Station) move between cells in the mobile communication network, it is inevitable that cell reselection occurs due to the strength and interference of the reception level, and the serving cell is replaced, so that the user can enjoy better network quality.

In the packet service, a concept closely related to the cell reselection process is the Network Control mode. There are three types of network control modes, namely NC0, NCI and NC2. In the NC0 mode, the MS does not report the measurement report to the network side in the packet service process, and the MS autonomously controls the cell reselection process. In the NC1 mode, the MS reports the measurement report to the network side in the packet service process, but is still autonomous by the MS. Controlling the cell reselection process; in the NC2 mode, the network side controls the cell reselection process according to the measurement report reported by the MS, and the network side decides which target neighboring cell to reselect, and sends the cell to the MS through the cell reselection command. Trigger MS reselection to the target neighbor.

In the network side cell reselection algorithm in the existing NC2 mode, the target neighboring cell may be connected due to insufficient radio resources such as radio channel resources of the target neighboring cell and transmission resources such as interface bandwidth between the base station and the controller. Failure to enter, eventually leading to cell reselection failure. Even if the MS cell reselection is successful, the resource load of the entire wireless network may be unbalanced, so that some heavily loaded cells may not be able to access new users anymore, and some cells may have a small load and idle. The situation of multiple resources, thus affecting the quality of service of the entire wireless network. Summary of the invention

In view of the above, the technical problem to be solved by the present invention is to provide a method and apparatus for realizing cell reselection, thereby improving the success rate of a mobile station in cell reselection, and balancing the overall network load.

In order to solve the above technical problems, the present invention provides the following solutions:

An embodiment of the present invention provides a method for implementing cell reselection, including:

Determining, by the first controller, a first target neighbor set according to the measurement report sent by the mobile station, where the first target neighbor set is a set of target neighbors that the mobile station can select when the cell is reselected;

The first controller selects, in the first target neighboring cell set, a first target neighboring zone that meets a preset selection condition, where the preset selection condition is a first selection condition determined according to the comprehensive result calculation value, or the The preset condition is a second selection condition determined according to the level value parameter of the target neighboring area, and the comprehensive result calculation value is a reselection priority parameter of the cell reselection by the mobile station and a level value of the target neighboring area. Parameters, radio resource available capacity parameters, and transmission resource available capacity parameters are calculated and obtained;

The first controller sends the first target neighboring area information to the mobile station, and the mobile station selects the first target neighboring area when the cell is reselected.

Preferably, in the method, the first controller selects, in the first target neighboring cell set, a first target neighboring zone that meets a preset selection condition:

For the first target neighboring cell set, when the first controller acquires the target neighboring cell corresponding to the resource information, selecting the target neighboring zone that meets the first selection condition;

For the first target neighboring cell set, when the first controller cannot acquire the target neighboring cell corresponding to the resource information, the target neighboring cell that meets the second selection condition is selected.

Preferably, in the method, the first control is performed on the first target neighboring cell set Obtaining a target neighboring area corresponding to the resource information, and selecting a target neighboring area that meets the first selection condition: the first controller determines whether the second target neighboring area set exists in the first target neighboring area set, where the The second target neighboring cell set is a set of target neighboring cells that the first controller can acquire corresponding resource information;

Determining, by the first controller, whether there is a third target neighboring cell set in the second target neighboring cell set, where the third target neighboring cell set is in the second target neighboring cell set, and the value of the corresponding parameter meets a preset parameter value. a set of target neighboring areas of the threshold, where the parameter includes a level value parameter of the target neighboring area, a radio resource available capacity parameter, and a transmission resource available capacity parameter;

The first controller determines, as the first target neighboring cell, the target neighboring area in the third target neighboring cell set that meets the first selection condition.

Preferably, in the method, the first controller determines, in the third target neighboring cell set, a target neighboring zone that meets the first selection condition as the first target neighboring zone:

When the reselection priority parameter of the cell reselection of the mobile station is greater than a preset reselection priority threshold, the first controller selects the third target neighboring cell set that meets the first selection condition. The target neighboring area is determined as the first target neighboring area;

When the reselection priority parameter of the cell reselection of the mobile station is not greater than a preset reselection priority threshold, but the third target neighboring cell set, the cell that meets the first selection condition is not the mobile station. In the current serving cell, the first controller determines, as the first target neighboring cell, the target neighboring cell that meets the first selection condition in the third target neighboring cell set.

Preferably, in the method, the calculated result of the comprehensive result is:

Comprehensive results IR = aP + pRRAC + yTRAC + S _RW ;

Where α is the weight corresponding to the target neighboring cell level value P, β is the weight corresponding to the available radio resource available capacity RRAC of the target neighboring cell, and γ is the weight corresponding to the available capacity TRAC of the target neighboring cell transmission resource, and S _RW is the The mobile station reselects the profit and loss value of the current serving cell to the target neighboring cell. When calculating the comprehensive result calculation value of the mobile station's current serving cell, the value of S _RW is based on the mobile station's current cell. The reselected reselection priority parameter is determined, and the value of the S _RW decreases as the reselection priority parameter value increases; when the calculated result of the target neighboring region is calculated, the value of S _RW is 0.

Preferably, in the method, when the second target neighboring cell set is empty, or the third target neighboring cell set is empty, the method further includes:

When the reselection priority parameter of the cell reselection of the mobile station is greater than the preset reselection priority threshold, the first controller matches the second selection condition in the fourth target neighboring cell set and is not the first controller. The target neighboring cell that is being punished is determined as the first target neighboring cell, and the fourth target neighboring cell set is a set of target neighboring cells that the first controller cannot obtain corresponding resource information.

Preferably, in the method, the method further includes:

The first controller receives a cell reselection failure message sent by the mobile station, where the cell reselection failure message carries the second target neighboring area information and the cause information of the cell reselection failure, where the second target neighboring area is the The target neighboring area where the mobile station cell reselection fails;

The second target neighboring area is a target neighboring area in which the first controller cannot obtain the corresponding resource information, and the reason information of the cell reselection failure is that the radio resource or the transmission resource of the second target neighboring area does not meet the preset requirement. The first controller punishes the second target neighboring cell, and does not allow the serving cell controlled by the first controller to select the second target neighboring cell when the cell is reselected within a preset penalty time.

Preferably, in the method, after the first controller punishes the second target neighboring area, the method further includes:

The first controller sends a penalty message including the second target neighboring area information to the second controller, where the second controller punishes the second target neighboring area, within the corresponding penalty time, The serving cell controlled by the second controller is allowed to select the second target neighboring cell when the cell is reselected, and the second controller is connected to the controller by using an interconnection interface.

Preferably, in the method, the method further includes:

The first controller receives a penalty message sent by the third controller, where the penalty message includes the The third target neighboring area information, the third controller is connected to the first controller through the interconnection interface; and the third target neighboring area is the first controller when the first controller cannot obtain the target neighboring area corresponding to the resource information, the first controller The third target neighboring cell is punished, and the serving cell controlled by the first controller is not allowed to select the third target neighboring cell when the cell is reselected within the corresponding penalty time.

The embodiment of the present invention further provides an apparatus for implementing cell reselection, where the apparatus includes: a determining module, configured to determine, according to a measurement report sent by a mobile station, a first target neighboring cell set, where the first target neighboring cell set is a selection module of the target neighboring area that can be selected by the mobile station during cell reselection, configured to select, in the first target neighboring cell set, a first target neighboring cell that meets a preset selection condition, the preset selection The condition is a first selection condition determined according to the comprehensive result calculation value, or the preset condition is a second selection condition determined according to the level value parameter of the target neighborhood, the comprehensive result calculation value being passed by the mobile station The reselection priority parameter of the cell reselection and the level value parameter of the target neighboring cell, the available capacity parameter of the radio resource, and the available capacity parameter of the transmission resource are calculated and obtained;

And a sending module, configured to send the first target neighboring area information to the mobile station, where the mobile station selects the first target neighboring area when the cell is reselected.

Preferably, the selecting module further includes:

a first determining unit, configured to determine whether there is a second target neighboring cell set in the first target neighboring cell set, where the second target neighboring cell set is a target neighboring zone that can implement the cell reselection device to obtain corresponding resource information. Collection

a second determining unit, configured to determine, in the second target neighboring cell set, whether there is a third target neighboring cell set, where the third target neighboring cell set is in the second target neighboring cell set, and the value of the corresponding parameter is consistent with the pre- a set of target neighboring cells with a parameter value threshold, where the parameter includes a level value parameter of the target neighboring cell, a radio resource available capacity parameter, and a transmission resource available capacity parameter;

a first determining unit, configured to meet the first selection condition in the third target neighboring cell set The target neighborhood is identified as the first target neighborhood.

Preferably, the calculated result of the comprehensive result is:

Comprehensive results IR = aP + pRRAC + yTRAC + S _RW ;

Where α is the weight corresponding to the target neighboring cell level value P, β is the weight corresponding to the available radio resource available capacity RRAC of the target neighboring cell, and γ is the weight corresponding to the available capacity TRAC of the target neighboring cell transmission resource, and S _RW is the The mobile station reselects the profit and loss value of the current serving cell to the target neighboring cell. When calculating the comprehensive result calculation value of the mobile station's current serving cell, the value of S _RW is based on the reselection priority of the mobile station's current cell reselection. The parameter is determined, and the value of the S _RW decreases as the value of the reselection priority parameter increases; when the calculation result of the comprehensive result of the target neighborhood is calculated, the value of S _RW is 0.

Preferably, the selecting module further includes:

a second determining unit, where the second target neighboring cell set is empty or the third target neighboring cell set is empty, and the mobile station reselecting the priority parameter of the cell reselection is greater than a preset weight When the priority threshold is selected, the target neighboring area in the fourth target neighboring cell set that meets the second selection condition and is not the first controller being punished is determined as the first target neighboring zone, and the fourth target neighboring zone set A set of target neighbors that cannot obtain corresponding resource information for the first controller.

Preferably, the device further includes:

a receiving module, configured to receive a cell reselection failure message sent by the mobile station, where the message carries the second target neighboring area information, and the cause information of the cell reselection failure, where the second target neighboring area is the mobile station Target neighboring area where cell reselection fails;

a punishing module, configured to: when the second target neighboring area is a target neighboring area where the controller cannot obtain corresponding resource information, and the reason information that the cell reselection fails is a radio resource or a transmission resource of the second target neighboring area If the second target neighboring cell is not met, the serving cell controlled by the cell reselection device is not allowed to select the second target during cell reselection within a preset penalty time. Neighborhood.

Preferably, the sending module is further configured to: punish the information including the second target neighboring area The penalty message is sent to the second controller, where the second controller punishes the second target neighboring cell, and does not allow the serving cell controlled by the second controller to select during cell reselection within the corresponding penalty time. The second target neighboring cell, the second controller is connected to the implemented cell reselection device by using an interconnection interface.

Preferably, the receiving module is further configured to: receive a penalty message sent by the third controller, where the penalty message includes third target neighboring area information, where the third controller is heavy with the implemented cell by using an interconnection interface Select device connection;

The penalty module is further configured to: when the third target neighboring area is the target neighboring area that is unable to obtain the corresponding resource information by the cell reselection device, the third target neighboring area is punished, and the corresponding penalty time is The serving cell controlled by the cell reselection device is not allowed to select the third target neighboring cell during cell reselection.

It can be seen from the above that the method and device for implementing cell reselection according to the embodiment of the present invention determine, by the first controller, the first target neighboring cell set according to the measurement report sent by the mobile station, where the first target neighboring The area set is a set of target neighboring areas that the mobile station can select when the cell is reselected; the first controller selects, in the first target neighboring area set, a first target neighboring area that meets a preset selection condition, The preset selection condition is a first selection condition determined according to the comprehensive result calculation value, or the preset condition is a second selection condition determined according to the level value parameter of the target neighborhood, and the comprehensive result calculation value is passed through Obtaining, by the mobile station, the reselection priority parameter of the cell reselection, the level value parameter of the target neighboring cell, the radio resource available capacity parameter, and the transmission resource available capacity parameter, where the first controller sends the The first target neighbor information, so that the mobile station selects the first target neighbor when the cell is reselected. Thereby, the success rate of the mobile station in cell reselection is improved, and the overall network load is balanced. DRAWINGS

1 is a schematic flowchart 1 of a cell reselection method according to an embodiment of the present invention;

2 is a schematic diagram 1 of an application scenario of a cell reselection method according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a scenario of a cell reselection method according to an embodiment of the present invention; FIG. 4 is a schematic diagram of a scenario of a cell reselection method according to an embodiment of the present invention; FIG. FIG. 6 is a schematic flowchart 2 of a cell reselection method according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart 3 of a cell reselection method according to an embodiment of the present disclosure;

FIG. 8 is a schematic flowchart 4 of a cell reselection method according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram 1 of a cell reselection apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram 1 of a selection module in a cell reselection apparatus according to an embodiment of the present invention; FIG. 11 is a schematic structural diagram 2 of a cell reselection apparatus according to an embodiment of the present invention. detailed description

The basic idea of the present invention is: The first controller determines, according to the measurement report sent by the mobile station, the first target neighboring cell set, where the first target neighboring cell set is a target neighbor that the mobile station can select when the cell is reselected. The first controller selects, in the first target neighboring cell set, a first target neighboring zone that meets a preset selection condition, where the preset selection condition is a first selection condition determined according to the comprehensive result calculation value. Or the preset condition is a second selection condition determined according to a level value parameter of the target neighboring area, where the integrated result calculation value is reselected by the mobile station, and the target neighboring area is reselected by the mobile station. The level value parameter, the radio resource available capacity parameter, and the transmission resource available capacity parameter are calculated; the first controller sends the first target neighbor information to the mobile station, and the mobile station selects when the cell reselects The first target neighborhood.

The embodiment of the invention provides a method for implementing cell reselection. As shown in FIG. 1, the method may specifically include the following steps:

Step 101: The controller determines, according to the measurement report sent by the mobile station, a first target neighboring cell set, where the first target neighboring cell set is a set of target neighboring cells that the mobile station can select when the cell is reselected.

Step 102: The controller selects a preset target selection condition in the first target neighboring area set. First target neighborhood;

Specifically, the preset selection condition may be a first selection condition determined according to the comprehensive result calculation value, or the preset condition is a second selection condition determined according to a level parameter of the target neighborhood, the comprehensive result calculation The value may be obtained by calculating, by the mobile station, the reselection priority parameter of the cell reselection, the level value parameter of the target neighboring cell, the radio resource available capacity parameter, and the transmission resource available capacity parameter.

Step 103: The controller sends the first target neighboring area information to the mobile station, so that the mobile station selects the first target neighboring area when the cell is reselected.

The method for implementing cell reselection provided by the embodiment of the present invention can be applied to the field of GSM mobile network, mainly for the group service, in the network control mode 2 (NC2), after the network side determines that a certain reselection condition is reached. How to select a better target neighboring area, so as to improve the success rate of re-election and gradually balance the load of the entire wireless network. In fact, the method for implementing cell reselection provided by the embodiment of the present invention is not limited to the field of GSM mobile network, and can also be applied to the field of 3G mobile network. The following mainly introduces the GSM mobile communication system as an example.

When the method provided by the embodiment of the present invention is specifically implemented, the controller may first determine, according to the measurement report sent by the mobile station, the target neighboring area that the mobile station (MS) can select during the cell reselection, and the target neighboring area. The form of the collection is statistically managed.

The target neighboring area (which may include the target neighboring area in 2, 3, 4G) according to the embodiment of the present invention may be based on a controller (divided into a dual mode controller and a single mode controller, and the following is controlled for convenience of description) The devices generally refer to the two types of resources. According to the resource information corresponding to the target neighboring area, they are classified into the following two categories:

1. The controller can obtain the target neighboring area of the resource information. For convenience of description, the following is referred to as the class A target neighboring area.

Class A target neighborhoods also have two subtypes, namely:

(1) The target neighboring cell and the current serving cell of the MS are in the same controller. (2) The controller where the target neighboring area is located and the controller where the current serving cell of the MS is located (such as the lur-g interface, the A interface, etc.), because the lur-g interface is a relatively common interface for resource information synchronization. For convenience of description, the following unified description and examples of the lur-g interface are used, but not limited to the case where the lur-g interface is connected.

2. The controller cannot obtain the target neighboring area of the resource information. For convenience of description, the following is simply referred to as the B-type target neighboring area.

The relationship between the Class B target neighboring cell and the MS current serving cell may be expressed as a cross-controller but the lur-g interface is not used for interconnection between the two controllers.

The application scenarios involved in the embodiments of the present invention may be as shown in FIGS. 2 to 5. Figure 2 shows the application scenario of the Class A target neighboring cell and the MS current serving cell in the same dual-mode controller. Figure 3 shows the application scenario of the Class A target neighboring cell and the MS current serving cell in the same single-mode controller. Figure 4 shows the application scenario where the controller of the Class A target neighboring cell is connected to the controller of the current serving cell of the MS. Figure 5 shows the controller where the B-type target neighboring cell is located and the controller where the current serving cell of the MS resides. There is no application scenario for interconnecting interfaces.

In the embodiment of the present invention, a reselection priority Resel _priority may be set in the process of performing cell reselection on the MS, where the reselection priority indicates the urgency of the MS to perform cell reselection, and the Resel _priority may be in the range of 1. The larger the value of 2, n and Resel _priOTity , the higher the urgency of reselection. For example, if the current serving cell level of the MS is too small and the uplink and downlink interference is severe, then Resd _pri . _{The rity} will be very large, and there is no problem in all aspects of the MS's current serving cell itself, but in order to find a better service cell, this time Resd _pri . _Rity will be smaller.

The method for implementing cell reselection provided by the embodiment of the present invention may select different implementation processes based on the type of the target neighboring cell.

For the class A target neighboring cell, the embodiment of the present invention can comprehensively consider the level quality of the target neighboring cell, the available capacity of the radio resource, and the available capacity of the transmission resource by weighting (available capacity = total capacity * (100 - total load), total load =0, 1 , 100 ) parameter, select one of the three theoretical ones Excellent or closest to an ideal (target value) target neighborhood.

The selection process for the class A target neighborhood can be determined based on the specific numerical value of the integrated result IR( Integrative Result ), and the calculation process of the IR value can be completed based on the following formula:

IR=aP+ RRAC+yTRAC+5 _RW ( 1 )

In Equation 1, α, β, and γ are the level (P), the available capacity of the radio resource (RRAC), and the corresponding capacity of the available resource (TRAC) of the target neighbor (which may also be the current serving cell of the MS), respectively. value. S _RW is the profit and loss value of the MS from the current service d, the area is reselected to the target neighbor, and S _{RW is} not a constant, which can be followed by Resd _pri . _The value of _rity decreases as the _rity value increases. When the IR value of the serving cell is calculated, the value of S _RW is reselected by the MS to the current cell Resd _pri . _Rity determines; when calculating the IR value of the target neighbor, the value of S _RW is 0.

Based on the formula 1 provided by the embodiment of the present invention, the above parameters can be grouped into an order of magnitude, so that the IR values can be conveniently, accurately and effectively compared, and a class A with the largest IR value or closest to an ideal value is selected. The target neighboring area is the target neighboring area that the MS finally selects when the cell is reselected. Further, the specific numerical values of α, β, and γ are not limited in the embodiment of the present invention.

When selecting the target neighborhood of the Α class, it is also possible to first determine whether the P, RRAC, and TRAC of the target neighboring area exceed the preset corresponding threshold value.

RRACihreshold and

TRACTh _resh . _Ld . And when the above parameters of the target neighboring area exceed the corresponding threshold value, the value of the comprehensive result IR is calculated according to the formula 1. If any parameter does not meet the corresponding threshold requirements, the target neighbor may be directly ignored.

In the embodiment of the present invention, the parameter threshold value may be determined based on a selection criterion of a target neighboring area that the MS needs to reselect, or other reference values.

When there is a Class A target neighboring cell whose corresponding parameter exceeds the threshold value, the last method of selecting the Class A target neighboring zone may be:

(1) When the MS reselects the cell reselection priority Resd _pri . _When the value of _rity is greater than the preset reselection priority threshold Resdx^^d, the selected IR value conforms to the preset selection condition (subsequent The target neighboring cell whose selection condition may be referred to as an IR value selection condition is a reselected cell finally selected by the MS when the cell is reselected.

(2) When the MS reselects the cell reselection priority Resd _pri . _When the value of _rity is not greater than the reselection priority threshold Reselxhreshoid, and the cell whose IR value meets the preset IR value selection condition is not the current serving cell of the MS, the target neighbor whose IR value meets the preset IR value selection condition is selected. The district is the reselected community as the final choice; otherwise, the re-election is abandoned.

For the class B target neighboring cell, the controller of the current serving cell of the MS cannot obtain the resource information of the target neighboring cell. Therefore, the selection priority of the class B target neighboring cell is lower than that of the class A target neighboring cell. In addition, in order to reduce the probability that the reselection to the B-type target neighboring cell fails due to insufficient radio resources or transmission resources, the embodiment of the present invention may consider that when the MS reselects from the serving cell to the B-type target neighboring cell, the cell fails. If the cause of the failure is insufficient radio resources or insufficient transmission resources, the category B target neighboring area is punished in the global scope of the current controller, and the class B target neighboring area is added to the penalty list, and a penalty time T is preset. _punish (T _punish in that the target may both neighboring resources at a very high load state, T _punish embodiment of the present invention relates embodiment is not equivalent to the existing order to prevent ping-pong time reselection penalty provided, taking into account The duration of the resource occupancy rate, the _{throughput of the} embodiment of the present invention may be much larger than the duration set to prevent the occurrence of ping-pong reselection. Within the T _punish , the controller does not allow the serving cell controlled by the controller to _proceed . When the MS cell is reselected, the target neighbor is selected.

At the same time, the controller involved in the embodiment of the present invention can also pass the target neighboring cell penalty message (the dual-mode controller can adopt the ASN.1 encoded internal message format, and the Iur-g-connected controller can transmit the message through the SCCP. The penalty message may include the target neighbor information of the reselection failure, and notify other controllers connected to the controller through the interconnection interface to simultaneously punish the target neighboring area, and when other controllers determine the target neighbor of the reselection failure When the zone is the class B target neighbor zone included in the controller, the target neighbor zone is also given the penalty of the duration of the T _punish set by other controllers. In this way, the cell of these controllers is prevented from performing cell reselection to the target neighboring cell, resulting in reselection. Lost.

Moreover, the controller according to the embodiment of the present invention may further receive a penalty message sent by another controller, and punify the target neighboring area when the target neighboring cell specified in the penalty message is also a class B cell of the controller. During the set penalty time, the serving cell controlled by the controller is not allowed to select the target neighboring cell when the cell is reselected.

Since the controller's resource information for the B-type target neighboring area is unknown, considering the uncertainty after re-election to such target neighboring area, there may be no Class A target neighboring area or the Class A target whose corresponding parameter does not exceed the threshold. Neighbor, and reselect priority Resd _pri . The value of _rity is greater than the reselection priority threshold Resel _Thresh . _{When ld} , the class B target neighborhood is selected. Under the above preconditions, a selection condition that is determined according to the level value of the neighborhood of the class B target may be selected (the level value is at most or close to an ideal value, and the subsequent selection condition may be referred to as a P value selection condition), and It is not the target neighborhood that the controller is penalizing (ie, not within the penalty time) as the final reselected cell. In addition, in the embodiment of the present invention, only the P value exceeds P Th _resh . _In the class B target neighboring area of _ld , a cell that meets the P value selection condition is selected as the final reselected cell.

The specific implementation process of implementing the cell reselection method provided by the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

As shown in FIG. 6, the method may include the following processing steps when implementing the cell reselection process:

Step 601: Determine a candidate target neighbor set Cl.

In this step, the controller corresponding to the MS current serving cell that needs to perform cell reselection may determine the target neighboring cell set C1 that the MS can select during the cell reselection based on the measurement report reported by the MS, and the controller may also Determine the reselection priority Resd _pri . _Rity .

Step 602: Perform cell classification.

The controller divides C1 into a class A candidate target neighboring cell set C2 and a class B candidate target neighboring cell set C3 according to whether the corresponding resource information, that is, the target neighboring cell type, can be acquired. Step 603: Determine whether C2 is empty.

The controller determines whether C2 is an empty set, and if not, continues, otherwise proceeds to step 610.

Step 604: Determine a target neighbor set C4 whose parameter exceeds the corresponding threshold.

The controller can traverse the target neighboring area in C2 to check whether the P value, RRAC value, and TRAC value of the target neighboring areas exceed the corresponding threshold value _PThresh . _Ld , RRACxhre^oM and

TRACTh _resh . _Ld . If the above parameters exceed the corresponding threshold, the controller classifies the corresponding target neighboring area into the class A candidate target neighboring zone set and C4.

Step 605: Determine whether C4 is an empty set, if not, continue, otherwise go to step 610. Step 606: Calculate the IR value of the target collar in C4.

Specifically, the IR value of the target neighboring area in C4 can be calculated based on Equation 1.

In this step, the operation of calculating the current serving cell IR value of the MS may also be included.

Step 607: Determine the reselection priority Resd _pri . Whether _rity is greater than the reselection priority threshold Resel _Threshold , if it is not greater, continue, otherwise go to step 609.

Step 608: Determine whether the cell whose IR value meets the IR value selection condition is the MS current service cell, and if not, continue, otherwise, go to step 613.

Step 609: Select the target neighboring cell whose IR value meets the IR value selection condition as the final selected reselected cell, and go to step 612.

Step 610: Determine whether C3 is an empty set, if not, continue, otherwise go to step 613. Step 611: When Reselp _{riOTity is} greater than Resel Threshold, a reselected _cell in C3 that meets the P value selection condition and is not the target that the controller is penalizing is selected as the final selection.

Step 612: Send a cell reselection command carrying the selected target neighbor information to the MS.

Step 613: End the process of selecting the reselection target neighborhood.

As shown in FIG. 7, the process of the method after the MS cell reselection fails may specifically include the following steps:

Step 701: Receive a cell reselection failure message sent by the MS. The cell reselection failure message carries the target neighbor information and the failure reason information ( Cause ) of the cell reselection failure.

Step 702: Determine a reason for the cell reselection failure.

By checking the reason information carried in the cell reselection failure message, it is determined whether the reason for the cell reselection failure is that the target neighboring area has insufficient radio resources or insufficient transmission resources, and if yes, continue, otherwise, go to step 709.

Step 703: Determine whether the target neighboring cell that fails the cell reselection is a class B target neighboring cell, and if yes, continue, otherwise, go to step 709.

Step 704: _Apply a penalty in the T _punish period to the target neighboring cell that fails the cell reselection. In the T _punish time period, the serving cell controlled by the controller is prohibited from reselecting to the target neighboring cell.

Step 705: Determine whether the current controller is a dual mode controller. If it is continued, otherwise go to step 707.

Step 706: Send a target neighbor penalty message to another system of the current dual mode controller, so that another standard of the current dual-empty controller also punishes the target neighbor.

The penalty message includes the target neighbor information of the cell reselection failure.

Step 707: Determine whether there are other controllers connected to the current controller using an interconnection interface (such as Iur-g), and if yes, continue, otherwise go to step 709.

Step 708: Send a target neighboring cell penalty message to all other controllers that are connected to the current controller by using an interconnection interface, and punify the target neighboring cell.

Step 709: The cell reselection failure processing flow ends.

As shown in FIG. 8, when the controller receives the target neighboring cell penalty message sent by another controller connected by the interconnect interface, the specific processing procedure of the method may include the following steps:

Step 801: Receive a target neighbor penalty message.

In the target neighboring area penalty message, carrying the need to perform the re-election penalty due to insufficient resources Target neighborhood information.

Step 802: Determine whether the target neighboring cell is a Class B target neighboring cell in the controller, and if yes, continue, otherwise go to step 804.

Step 803: _Applying a penalty within the set period of the target neighboring cell to the target neighboring cell, and not allowing the serving cell controlled by the controller to reselect the target neighboring cell to be punished in the T _punish time period.

Step 804: The target neighboring area penalty message processing flow ends.

It can be seen from the above description that the method for implementing cell reselection provided by the embodiment of the present invention classifies the target neighboring cells that can be selected by the mobile station when the cell is reselected, and uses different targets for different types of target neighboring cells. The neighboring area reselection method selects the target neighboring area, thereby significantly improving the success rate of the mobile station cell reselection while ensuring the user's sensitivity. Moreover, the target neighboring area reselection method fully considers the target neighboring area. The comprehensive performance of the parameters allows the entire wireless network to be load balanced.

The embodiment of the present invention further provides a device for implementing cell reselection, and the device may be specifically a controller. As shown in FIG. 9, the device may specifically include:

The determining module 910 is configured to determine, according to the measurement report sent by the mobile station, the first target neighboring area set Cl.

The first target neighboring cell set C1 is a set of target neighboring cells that the mobile station can select when the cell is reselected.

The selecting module 920 is configured to select, in the first target neighboring cell set, a first target neighboring cell that meets a preset selection condition.

The preset selection condition is a first selection condition (hereinafter may be referred to as an IR value selection condition) determined according to the integrated result calculation value (IR), or the preset condition is a level value according to the target neighboring area (P) a second selection condition determined by the parameter (hereinafter may be referred to as a P value selection condition), wherein the integrated result calculation value is a reselection priority parameter and a target according to the mobile station's current cell reselection The neighboring level value parameter, the radio resource available capacity parameter, and the transmission resource available capacity parameter are calculated and obtained.

The sending module 930 is configured to send the first target neighboring cell information to the mobile station, so that the mobile station selects the first target neighboring cell when the cell is reselected.

The implementation of the cell reselection apparatus provided by the embodiment of the present invention can improve the success rate of the mobile station when the cell is reselected, and balance the overall network load.

The target neighboring area according to the embodiment of the present invention may be classified into the following two types based on whether the device can obtain the resource information corresponding to the target neighboring area:

In the embodiment of the present invention, a reselection priority Resel _priority may be set in the process of performing cell reselection on the MS, where the reselection priority indicates the urgency of the MS to perform cell reselection, and the Resel _priority may be in the range of 1. 2, n , the greater the value of Resel _priOTity , the higher the urgency of re-election.

The implementation of the cell reselection device provided by the embodiment of the present invention may be based on the type of the target neighboring cell, and different implementation processes may be selected.

For the class A target neighboring cell, the embodiment of the present invention can comprehensively consider the level quality of the target neighboring cell, the available capacity of the radio resource, and the available capacity of the transmission resource by weighting (available capacity = total capacity * (100 - total load), total load =0, 1 , 100 ) parameter, select a target neighboring area that is theoretically optimal or closest to an ideal value (target value).

IR=aP+ RRAC+yTRAC+5 _RW

In this formula, α, β, and γ are the level values ( P ), the available resources of the radio resources ( RRAC ), and the available capacity of the transmission resources ( TRAC ) of the target neighbor (which may also be the current serving cell of the MS). Corresponding weight. S _RW is the profit and loss value of the MS from the current service d, the area is reselected to the target neighbor, and S _{RW is} not a constant, which can be followed by Resd _pri . _The value of _rity decreases as the _rity value increases. When the IR value of the serving cell is calculated, the value of S _RW is reselected by the MS to the current cell Resd _pri . _Rity determines; when calculating the IR value of the target neighbor, the value of S _RW is 0.

Based on the above formula provided by the embodiment of the present invention, the above parameters can be grouped into an order of magnitude, so that the IR values can be conveniently, accurately, and effectively compared, and a class A with the largest IR value or closest to an ideal value is selected. The target neighboring area is the target neighboring area that the MS finally selects when the cell is reselected. Further, the specific numerical values of α, β, and γ are not limited in the embodiment of the present invention.

When selecting the target neighborhood of the Α class, it is also possible to first determine whether the target neighbor's P (level value), RRAC (radio resource available capacity), and TRAC (transmission resource available capacity) exceed the preset corresponding threshold. value

RRACihreshold and TRAC _Thresh . _Ld . And when the above parameters of the target neighboring area exceed the corresponding threshold value, the value of the comprehensive result IR is calculated according to the above formula. If any parameter does not meet the corresponding threshold requirements, the target neighbor may be directly ignored.

Based on the above description, in an optional embodiment of the present invention, as shown in FIG. 10, the selection module 920 may specifically include:

The determining unit 921 is configured to determine whether there is a second target neighboring cell set C2 in the C1 determined by the determining module 910, where the C2 is a set of target neighboring cells that can implement the cell reselection device to obtain corresponding resource information.

The determining unit 922 is configured to determine whether there is a third target neighboring cell set C3 in the C2, where the C3 is the set of the target neighboring zone whose value of the corresponding parameter meets a preset parameter value threshold, where the parameter includes the target The level value parameter of the neighboring cell, the available capacity parameter of the radio resource, and the available capacity parameter of the transmission resource.

The determining unit 923 is configured to: in the C3, the IR value meets the IR value selection condition (ie, the IR value is the largest) The target neighboring cell, or closest to an ideal value, determines the first target neighboring cell, that is, the target neighboring zone that is ultimately selected when the cell is reselected.

The method for determining unit 923 to finally select the class A target neighborhood may also be:

(1) When the MS reselects the cell reselection priority Resd _pri . _When the value of _rity is greater than the reselection priority threshold Reselxhreshoid, the target neighboring cell whose IR value meets the preset IR value selection condition is the reselected cell finally selected by the MS during cell reselection.

(2) When the MS reselects the cell reselection priority Resd _pri . _When the value of the _rity is not greater than the reselection priority threshold Reselxhreshoid, and the cell whose IR value meets the preset IR value selection condition is not the current serving cell of the MS, the target neighboring cell whose IR value meets the preset selection condition is selected. Reselect the cell for the final selection; otherwise, abandon this reselection.

When the cell reselection device provided by the embodiment of the present invention selects the B-type target neighboring cell, the controller of the current serving cell of the MS cannot obtain the resource information of the B-type target neighboring cell, and therefore the B-type target neighboring cell The selection priority is lower than the Class A target neighborhood. Considering the uncertainty after reselecting to the Class B target neighborhood, there may be no Class A target neighbors or Class A target neighbors whose corresponding parameters cannot exceed the threshold, and the priority Resd _{pri is} reselected. The value of _rity is greater than the reselection priority threshold Resel _Thresh . _{When ld} , the class B target neighbor is selected. Under the above preconditions, the selectable level value satisfies the P value selection condition (ie, the P value is the largest or the closest to an ideal value), and is not the target neighbor that realizes that the cell reselection device is punishing (ie, not within the penalty time). The district serves as the final reselected community.

Based on the above description, in an optional embodiment of the present invention, as shown in FIG. 10, the selection module 920 further includes:

a determining unit 924, configured to: when C2 is empty or the C3 is empty, and the reselection priority parameter of the mobile station reselecting the cell is greater than a preset reselection priority threshold, the fourth target neighboring cell is used In the set C4, the target value that meets the P value selection condition and is not the target neighboring area that the cell reselection device is penalizing is determined as the target neighboring area that is finally selected when the cell is reselected, and the fourth target neighboring cell set is selected. And the set of the target neighboring areas that the cell reselection device cannot obtain the corresponding resource information. In addition, in order to reduce the probability that the reselection to the B-type target neighboring cell fails due to insufficient radio resources or transmission resources, the embodiment of the present invention may consider that when the MS reselects from the serving cell to the B-type target neighboring cell, the cell fails. If the cause of the failure is insufficient radio resources or insufficient transmission resources, the category B target neighboring area is punished in the global scope of the current controller, and the class B target neighboring area is added to the penalty list, and a penalty time T is preset. _punish (T _punish in that the target may both neighboring resources at a very high load state, T _punish embodiment of the present invention relates embodiment is not equivalent to the existing order to prevent ping-pong time reselection penalty provided, taking into account duration share resources, embodiments of the present invention relates may be much larger than T _punish to prevent ping-pong duration reselection is provided), in which T _punish, to achieve cell reselection apparatus (controller) does not allow to achieve cell The serving cell controlled by the reselection device selects the target neighboring cell when performing MS cell reselection.

Based on the above description, in an optional embodiment of the present invention, the apparatus may further include:

The receiving module 940 is configured to receive a cell reselection failure message sent by the mobile station, where the message carries the second target neighboring area information, and the cause information of the cell reselection failure, where the second target neighboring area is the mobile The target neighboring area where the cell reselection failed;

The punishing module 950 is configured to: when the second target neighboring area is a target neighboring area where the controller cannot obtain corresponding resource information, and the reason information that the cell reselection fails is the wireless resource or transmission of the second target neighboring area The resource does not meet the preset requirement, and the second target neighboring cell is punished. The serving cell controlled by the cell reselection device is not allowed to select the second target neighbor in the cell reselection within a preset penalty time T _punish . Area.

In addition, the cell reselection device provided by the embodiment of the present invention may also notify other devices connected to the device through an interconnection interface (for example, an Iur-g interface) through the target neighboring cell penalty message. If the other controller determines that the target neighboring area of the reselection failure is a Class B target neighboring area included in other controllers, the target neighboring area will also be given a setting. The punishment of the time of T _punish . In this way, the cells of other controllers are prevented from performing cell reselection to the target neighboring cell, resulting in reselection failure.

Based on the foregoing description, in an optional embodiment of the present invention, the sending module 930 is further configured to: send a target neighboring cell penalty message including the second target neighboring cell information to the second controller, so that the second The controller punishes the second target neighboring cell, and does not allow the serving cell controlled by the second controller to select the second target neighboring cell when the cell is reselected within the set penalty time, the second The controller is coupled to the implemented cell reselection device via an interconnection interface.

Moreover, the implementation of the cell reselection apparatus provided by the embodiment of the present invention may further receive a penalty message sent by another controller, and when the target neighboring zone specified in the penalty message is also the class B target neighboring zone of the device, The target neighboring cell is punished, and within the set penalty time, the serving cell controlled by the device is not allowed to select the target neighboring cell when the cell is reselected.

Based on the foregoing description, in an optional embodiment of the present invention, the receiving module 940 is further configured to: receive a penalty message sent by the third controller, where the penalty message includes third target neighbor information, the third The controller is coupled to the implemented cell reselection device via an interconnection interface.

The penalty module 950 may be further configured to: if the third target neighboring area is the target neighboring area where the implementing cell reselection device cannot obtain the corresponding resource information, the third target neighboring area is punished, and the penalty is set. During the time, the serving cell controlled by the cell reselection device is not allowed to select the third target neighboring cell during cell reselection.

A complete structural diagram of a cell reselection apparatus provided by an embodiment of the present invention can be as shown in FIG.

It can be seen from the above description that the cell reselection device provided by the embodiment of the present invention classifies the target neighboring cells that can be selected by the mobile station during cell reselection, and uses different targets for different types of target neighboring cells. The neighboring area reselection method selects the target neighboring area, thereby significantly improving the success rate of the mobile station cell reselection while ensuring the user's sensitivity. Moreover, the target neighboring area reselection method fully considers the target neighboring area. The comprehensive performance of the parameter The entire wireless network is load balanced.

The above description is only an embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. These improvements and retouchings should also be considered. It is the scope of protection of the present invention.

Claims

Claim

A method for implementing cell reselection, characterized in that:

The method according to claim 1, wherein the first controller selects, in the first target neighboring cell set, a first target neighboring zone that meets a preset selection condition:

The method according to claim 2, wherein, in the first target neighboring cell set, when the first controller acquires the target neighboring cell corresponding to the resource information, selecting the first selection condition is met. The target neighborhood is:

Determining, by the first controller, whether there is a second target neighboring cell set in the first target neighboring cell set, where the second target neighboring cell set is a set of target neighboring cells that the first controller can obtain corresponding resource information; Determining, by the first controller, whether there is a third target neighboring cell set in the second target neighboring cell set, where the third target neighboring cell set is in the second target neighboring cell set, and the value of the corresponding parameter meets a preset parameter value. a set of target neighboring areas of the threshold, where the parameter includes a level value parameter of the target neighboring area, a radio resource available capacity parameter, and a transmission resource available capacity parameter;

The method according to claim 3, wherein the first controller determines, in the third target neighboring cell set, a target neighboring zone that meets the first selection condition as the first target neighboring zone:

The method according to any one of claims 1 to 4, characterized in that the calculated result is:

Comprehensive results IR = aP + pRRAC + yTRAC + S _RW ;

The method according to claim 3, wherein, when the second target neighboring cell set is empty, or the third target neighboring cell set is empty, the method further includes:

The method according to claim 1, wherein the method further comprises: receiving, by the first controller, a cell reselection failure message sent by the mobile station, where the cell reselection failure message carries the second target neighboring cell Information and cause information of cell reselection failure, the second target neighboring cell is a target neighboring cell that fails to reselect the mobile station cell;

The method according to claim 7, wherein after the first controller punishes the second target neighboring area, the method further includes:

The method according to claim 2 or 8, wherein the method further comprises: receiving, by the first controller, a penalty message sent by the third controller, where the penalty message includes third target neighboring area information, where The third controller is connected to the first controller through the interconnection interface;

The third target neighboring area is a target neighboring area where the first controller cannot obtain corresponding resource information. The first controller punishes the third target neighboring cell, and does not allow the serving cell controlled by the first controller to select the third target neighboring cell when the cell is reselected within the corresponding penalty time.

10. A device for implementing cell reselection, characterized in that the device comprises:

a determining module, configured to determine, according to the measurement report sent by the mobile station, a first target neighboring cell set, where the first target neighboring cell set is a selection module of the target neighboring cell that the mobile station can select when the cell is reselected, And selecting, in the first target neighboring cell set, a first target neighboring zone that meets a preset selection condition, where the preset selection condition is a first selection condition determined according to the comprehensive result calculation value, or the preset condition a second selection condition determined according to a level value parameter of the target neighboring area, the integrated result calculation value is a reselection priority parameter of the cell reselection by the mobile station, and a level value parameter of the target neighboring cell, wireless The resource available capacity parameter and the transmission resource available capacity parameter are calculated and obtained;

The device according to claim 10, wherein the selecting module further comprises:

The first determining unit is configured to determine, as the first target neighboring cell, the target neighboring cell that meets the first selection condition in the third target neighboring cell set.

12. The apparatus according to claim 11, wherein the calculated result of the comprehensive result is:

Comprehensive results IR = aP + pRRAC + yTRAC + S _RW ;

The device according to claim 11, wherein the selecting module further comprises: a second determining unit, configured to: the second target neighboring cell set is empty or the third target neighboring cell set is empty And when the reselection priority parameter of the cell reselection of the mobile station is greater than a preset reselection priority threshold, the fourth target neighboring cell set meets the second selection condition and is not the first controller is punishing The target neighboring area is determined as the first target neighboring area, and the fourth target neighboring area set is a set of target neighboring areas in which the first controller cannot obtain corresponding resource information.

The device according to claim 10 or 13, wherein the device further comprises: a receiving module, configured to receive a cell reselection failure message sent by the mobile station, where the message carries the second target neighboring area information And the cause information of the cell reselection failure, where the second target neighboring cell is the target neighboring cell where the mobile station cell reselection fails;

The device according to claim 14, wherein the sending module is further configured to: Sending a penalty message including the second target neighboring area information to the second controller, where the second controller punishes the second target neighboring area, and does not allow the second control within the corresponding penalty time The serving cell controlled by the device selects the second target neighboring cell when the cell is reselected, and the second controller is connected to the implemented cell reselecting device by using an interconnection interface.

The device according to claim 14, wherein the receiving module is further configured to: receive a penalty message sent by the third controller, where the penalty message includes third target neighboring area information, and the third The controller is connected to the implemented cell reselection device through an interconnection interface;