WO2015169238A1

WO2015169238A1 - Cell selection method and device and control method and device therefor

Info

Publication number: WO2015169238A1
Application number: PCT/CN2015/078461
Authority: WO
Inventors: 梁靖; 杨义
Original assignee: 电信科学技术研究院
Priority date: 2014-05-08
Filing date: 2015-05-07
Publication date: 2015-11-12
Also published as: CN105101344B; CN105101344A

Abstract

Disclosed are a cell selection method and device and a control method and device therefor, which are used for enabling UEs in an idle state to evenly reside in cells in different RATs, thereby avoiding the overload of a cell in a single RAT. The cell selection control method provided in the present application comprises: determining, by a base station, correlations between a plurality of frequency points and resident factors, wherein the resident factors corresponding to at least two frequency points in different radio access technologies (RATs) are different; and notifying, by the base station, a user equipment (UE) of the correlations between the plurality of frequency points and the resident factors.

Description

Cell selection and control method and device thereof

The present application claims priority to Chinese Patent Application No. 201410193278.5, filed on May 8, 2014, the entire disclosure of which is incorporated herein by reference. In this application.

Technical field

The present application relates to the field of communications technologies, and in particular, to a cell selection and control method and apparatus thereof.

Background technique

In the prior art, cell selection between E-UTRAN (Evolved Universal Terrestrial Radio Access Network) and other systems is based on an absolute priority mechanism. When the UE (User Equipment) re-selects an inter-frequency/different technology, it needs to be treated according to the relationship between its priority and the current service frequency priority (higher, equal, lower than). Different systems are not allowed to have the same priority. Moreover, the current protocol stipulates that the UE can only perform cell selection evaluation if the E-UTRAN frequency or the different technology frequency point is provided by the system information and there is priority for this frequency point.

In a certain geographical range, a cell with multiple RATs (Radio Access Technology) may be deployed for coverage. A UE with access to multiple RATs may detect multiple cells at the same time. It will perform cell selection and reselection according to the rules described above, that is, a cell selection scheme based on frequency priority may cause the geographical range. A large number of multi-mode UEs are camped on a certain RAT, resulting in an unbalanced number of idle state UEs camping between different RATs. If a large number of idle state UEs under a certain RAT initiate a large amount of services in a short time, the RAT may be overloaded.

To sum up, at present, the cell selection scheme based on the absolute priority of the frequency point is adopted between different RATs, and the frequency priorities of different RATs cannot be the same or cross. This configuration may result in a large number of UEs being camped on a certain RAT, resulting in an unbalanced UE load in the idle state between different RATs. If a large number of UEs initiate services at the same time, a certain RAT may be overloaded.

Summary of the invention

An embodiment of the present application provides a cell selection and a control method and apparatus thereof, so that an idle state UE can be uniformly camped on a cell of a different RAT to avoid cell overload of a single RAT.

A cell selection control method provided by an embodiment of the present application includes:

The base station determines a correspondence between the multiple frequency points and the camping factor, wherein the frequency points corresponding to the frequency points of the at least two different radio access technology RATs are different;

The base station notifies the user equipment UE of the correspondence between the multiple frequency points and the camping factor.

In this method, the base station can notify the UE of the corresponding relationship between the multiple frequency points and the camping factor, so that the idle state UE can be uniformly camped on different RATs according to the correspondence between the multiple frequency points and the camping factors. In a cell, the cell overload of a single RAT is avoided.

Optionally, all frequency points in any RAT correspond to the same camping factor; or, at least two frequency points in any RAT correspond to different camping factors.

Optionally, the base station notifies the UE of the correspondence between the multiple frequency points and the camping factors, including:

The base station notifies the UE of the correspondence between multiple frequency points and the camping factor in a broadcast manner or through a dedicated signaling manner.

Optionally, when the base station notifies the UE of the corresponding relationship between the multiple frequency points and the camping factor by using the broadcast mode, the base station notifies the UE of the corresponding relationship between the multiple frequency points and the resident factor by using the system information; When the base station notifies the UE of the correspondence between the multiple frequency points and the camping factor by using the dedicated signaling manner, the base station uses the RRC connection release message or the RRC connection reconfiguration message to locate multiple frequency points. The correspondence of the retention factors is notified to the UE.

Optionally, the method further includes:

The base station adjusts a camping factor corresponding to any frequency point, and notifies the UE of the corresponding relationship between the frequency point and the adjusted camping factor.

A cell selection method provided by an embodiment of the present application includes:

The user equipment UE determines a correspondence between a plurality of frequency points and a camping factor, wherein the frequency points corresponding to the frequency points of the at least two different radio access technologies RATs are different;

The UE performs cell selection according to a correspondence between multiple frequency points and a camping factor.

In this method, the UE performs cell selection according to the correspondence between the multiple frequency points and the camping factor, so that the idle state UE can be equally camped on the cells of different RATs according to the correspondence between the multiple frequency points and the camping factors. In the case, the cell overload of a single RAT is avoided.

Optionally, the dwell factor is a value within a preset range;

The UE performs cell selection according to a correspondence between multiple frequency points and a camping factor, including:

The UE sorts the candidate cells according to the highest priority of the absolute priority corresponding to each frequency point, and sequentially selects the candidate cells according to the order from highest to lowest and determines whether to camp on the currently selected candidate. Community

The determining, by the UE, whether to camp on the currently selected candidate cell includes: the UE is in the preset A random number is generated, and the random number is compared with a dwell factor corresponding to the frequency point of the currently selected candidate cell, and it is determined according to the comparison result whether to camp on the currently selected candidate cell.

Optionally, the UE determines, according to the comparison result, whether to camp on the currently selected candidate cell, including:

When the random number is less than or equal to a camping factor corresponding to a frequency point of the currently selected candidate cell, determining to camp in the currently selected candidate cell; otherwise, the UE is sorted according to the candidate cell in descending order The next ordered candidate cell is selected and it is determined whether to camp on the candidate cell.

Optionally, the UE performs cell selection according to a correspondence between multiple frequency points and a camping factor, including:

For each candidate cell, the UE multiplies the camping factor corresponding to the frequency point where the candidate cell is located by the absolute priority of the frequency point where the candidate cell is located, and uses the obtained product as the evaluation value corresponding to the candidate cell;

The UE selects the camping candidate cell according to the order of the evaluation values corresponding to the candidate cells.

For each candidate cell, the UE adds the camping factor corresponding to the frequency point where the candidate cell is located to the signal quality of the candidate cell, and uses the obtained sum value as the evaluation value corresponding to the candidate cell;

Optionally, the method further includes:

Update the dwell factor for any frequency point.

A cell selection control apparatus provided by an embodiment of the present application includes:

a resident factor determining unit, configured to determine a correspondence between multiple frequency points and a camping factor, where frequency points corresponding to frequency points in at least two different radio access technology RATs are different;

And a notification unit, configured to notify the user equipment UE of the correspondence between the multiple frequency points and the camping factor.

The device is notified to the user equipment UE by the corresponding relationship between the multiple frequency points and the camping factor, so that the idle state UE can be uniformly camped on the cells of different RATs according to the correspondence between the multiple frequency points and the camping factors. In the case, the cell overload of a single RAT is avoided.

Optionally, the notification unit is specifically configured to:

The corresponding relationship between multiple frequency points and the camping factor is notified to the UE by broadcast or by dedicated signaling.

Optionally, when the notification unit notifies the UE of the correspondence between the multiple frequency points and the resident factor by using a broadcast manner, the notification unit notifies the corresponding relationship between the multiple frequency points and the resident factor by using the system information. a UE, when the notification unit notifies the UE of the correspondence between the multiple frequency points and the camping factor by using a dedicated signaling manner, the notification unit may control the RRC connection release message or the RRC connection reconfiguration message by using the RRC connection Frequency and dwell factor The correspondence is notified to the UE.

Optionally, the camping factor determining unit is further configured to: adjust a dwell factor corresponding to any frequency point;

The notification unit is further configured to: notify the UE of the correspondence between any frequency point and the adjusted resident factor.

A cell selection apparatus provided by an embodiment of the present application includes:

And a reselecting unit, configured to perform cell selection according to a correspondence between multiple frequency points and a dwell factor.

The cell selection is performed by the device according to the corresponding relationship between the multiple frequency points and the camping factor, so that the idle state UE can be uniformly camped on the cells of different RATs according to the corresponding relationship between the multiple frequency points and the camping factor. Avoid cell overload of a single RAT.

Optionally, the dwell factor is a value within a preset range;

The reselecting unit is specifically configured to: sort the candidate cells according to the highest priority of the absolute priority corresponding to each frequency point, and select the candidate cells in order from highest to lowest and determine whether to camp. Retained to the currently selected candidate cell;

The reselection unit determines whether to camp on the currently selected candidate cell, and the method includes: the reselection unit generates a random number in the preset range, and the random number and the frequency of the currently selected candidate cell The dwell factor corresponding to the point is compared, and it is judged according to the comparison result whether to camp on the currently selected candidate cell.

Optionally, the reselecting unit determines, according to the comparison result, whether to camp on the currently selected candidate cell, including:

Determining camping in the currently selected candidate cell when the random number is less than or equal to a camping factor corresponding to a frequency point at which the currently selected candidate cell is located; otherwise, the reselecting unit is sorted according to the candidate cell from high to low. The order selects the next ordered candidate cell and determines whether to camp on the candidate cell.

Optionally, the reselecting unit is specifically configured to:

For each candidate cell, the reselection unit multiplies the camping factor corresponding to the frequency point where the candidate cell is located with the absolute priority of the frequency point where the candidate cell is located, and uses the obtained product as the evaluation corresponding to the candidate cell. value;

The resident candidate cells are selected in descending order of the evaluation values corresponding to the candidate cells.

Optionally, the reselecting unit is specifically configured to:

For each candidate cell, the camping factor corresponding to the frequency point where the candidate cell is located is added to the signal quality of the candidate cell, and the obtained sum value is used as an evaluation value corresponding to the candidate cell;

Optionally, the camping factor determining unit is further configured to: update a camping factor corresponding to any frequency point.

DRAWINGS

FIG. 1 is a schematic flowchart of a cell selection control method according to an embodiment of the present application;

2 is a schematic flowchart of a cell selection method according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a cell selection control apparatus according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a cell selection apparatus according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of another cell selection apparatus according to an embodiment of the present application.

detailed description

The cell selection in the embodiment of the present application may be the initial cell selection or the cell reselection.

Referring to FIG. 1 , on the network side, a cell selection control method provided by an embodiment of the present application includes:

S101. The base station determines a correspondence between the multiple frequency points and the camping factor, where the frequency of the frequency points corresponding to the at least two different radio access technologies RATs is different.

In this embodiment, the hopping factors corresponding to the frequency points in all RATs cannot all be the same. If this is not meaningful, for example, there are three frequency points, which are the first frequency point, the second frequency point, and the third. Frequency point, where the first frequency point belongs to LTE (Long Term Evolution), the second frequency point belongs to UMTS (Universal Mobile Telecommunications System), and the third frequency point belongs to GERAN (GSM/EDGE Radio Access Network) , GSM/EDGE radio access network; GSM, Global System for Mobile Communications, Global System for Mobile Communications; EDGE, Enhanced Data rates for GSM Evolution, enhanced data rate for GSM evolution), but each of these three frequencies The factors cannot be the same.

S102. The base station notifies the user equipment UE of the correspondence between the multiple frequency points and the camping factor.

The camping factor in the embodiment of the present application is a parameter that the UE refers to when performing cell selection.

The base station notifies the UE of the correspondence between the frequency point and the camping factor, and is used to indicate that the UE performs cell selection by referring to the correspondence between the frequency point and the camping factor when the cell selection is required.

The camping factor can be RAT level, that is, there is one for each RAT, and the UE is for all frequency points in the RAT, This dwell factor is used. The camping factor can also be at the frequency level, ie each frequency point in each RAT can have a dwell factor for which the UE uses the dwell factor.

Optionally, all the frequency points in any RAT correspond to the same camping factor, that is, all frequency points in each RAT correspond to one camping factor; or, at least two frequency points in any RAT correspond to The dwell factor is different. For example, each frequency point in a certain RAT corresponds to a different dwell factor, or the dwell factor corresponding to two frequency points in a certain RAT is the same, but the dwell factor corresponding to other frequency points. different.

When all frequency points in each RAT correspond to one camping factor: the frequency factors corresponding to the frequency points in different RATs are different, for example, LTE, UMTS, and GERAN have three RATs, respectively, corresponding to one camping factor, respectively. The dwell factors are different, but the dwell factor corresponding to each frequency point in LTE is the same, the dwell factor corresponding to each frequency point in UMTS is the same, and the dwell factor corresponding to each frequency point in GERAN is the same. Or, the RATs of all the RATs are not unique. For example, LTE, UMTS, and GERAN have three RATs, respectively corresponding to one camping factor, and the camping factor corresponding to the frequency point in LTE is corresponding to the frequency point in the UMTS. The factors are different, but the dwell factor corresponding to the frequency point under UMTS is the same as the dwell factor corresponding to the frequency point under GERAN.

Similarly, when each frequency point of each RAT corresponds to one dwell factor: the dwell factors corresponding to different frequency points are different; or, the dwell factors corresponding to all frequency points are not unique, that is, at least two under any RAT The frequency of the corresponding frequency is different, and there are cases where the frequency of the corresponding frequency is the same.

Optionally, the base station notifies the UE of the correspondence between the multiple frequency points and the camping factor, including:

The base station notifies the UE of the correspondence between multiple frequency points and the camping factor by using a broadcast method or a dedicated signaling manner.

Optionally, when the base station notifies the UE of the corresponding relationship between the multiple frequency points and the camping factor by using the broadcast mode, the base station notifies the UE of the correspondence between the multiple frequency points and the camping factor by using the system information; When the signaling mode notifies the UE of the corresponding relationship between the multiple frequency points and the camping factor, the base station notifies the UE of the correspondence between the multiple frequency points and the camping factor by using the RRC connection release message or the RRC connection reconfiguration message. .

Optionally, the method further includes:

The base station adjusts the camping factor corresponding to any frequency point, and notifies the UE of the corresponding relationship between the frequency point and the adjusted camping factor.

For example, the base station may adjust the dwell factor corresponding to any frequency point according to the load condition of the cell and the neighboring access technology cell, and notify the UE of the corresponding relationship between the frequency point and the adjusted dwell factor.

The base station can adjust the camping factor corresponding to any frequency point according to the load condition of the cell and the neighboring access technology cell. For example, the RAT load to which the currently camped cell belongs is higher, and the RAT load of the neighboring cell belongs to the RAT load. If the base station is lower, the base station can adjust the camping factor of the RAT to which the own cell belongs to a direction that is not favorable for camping, and the neighboring cell The resident factor of the associated RAT is adjusted in a direction more favorable to the camping to achieve the purpose of idle state load balancing.

Correspondingly, on the terminal side, referring to FIG. 2, a cell selection method provided by the embodiment of the present application includes:

S201: The user equipment UE determines a correspondence between a plurality of frequency points and a camping factor, where a frequency corresponding to a frequency point of at least two different radio access technologies RATs is different;

S202. The UE performs cell selection according to a correspondence between multiple frequency points and a camping factor.

The corresponding relationship between the frequency point and the stagnation factor in the embodiment of the present application may be notified to the UE by the network side, or may be pre-configured on the UE side, and the UE may perform frequency and dwell factor according to the notification of the network side. The correspondence is updated or the correspondence between the frequency and the resident factor is updated as needed.

In this embodiment, the UE may perform cell selection only according to the correspondence between the frequency point and the camping factor, or may perform cell selection according to the correspondence between the frequency point and the camping factor and combined with other parameters, where other parameters, for example, : RAT's absolute priority, cell signal quality, etc.

Optionally, the dwell factor is a value within a preset range;

The UE performs cell selection according to the correspondence between multiple frequency points and the camping factor, including:

The UE sorts the candidate cells according to the highest priority of the absolute priority corresponding to each frequency point, and sequentially selects the candidate cells according to the order from high to low and determines whether to camp on the currently selected candidate cell;

If the UE determines whether to camp on the currently selected candidate cell, the UE generates a random number in a preset range, and compares the random number with a resident factor corresponding to the frequency point of the currently selected candidate cell, according to the The comparison result determines whether to camp on the currently selected candidate cell.

When the random number is less than or equal to the camping factor corresponding to the frequency point of the currently selected candidate cell, it is determined to camp in the currently selected candidate cell; otherwise, the UE selects the next sort according to the candidate cell order from highest to lowest. The candidate cell and determine whether to camp on the candidate cell.

For each candidate cell, the UE multiplies the camping factor corresponding to the frequency point where the candidate cell is located by the absolute priority of the frequency point where the candidate cell is located (or other operation mode, not limited to multiplication), and The product of the product is the evaluation value corresponding to the candidate cell;

The UE selects the candidate cell to camp according to the order of the evaluation values corresponding to the candidate cells.

For each candidate cell, the UE adds the camping factor corresponding to the frequency point where the candidate cell is located to the signal quality of the candidate cell (other operations may be performed, not limited to adding), and the obtained sum value is used as the The evaluation value corresponding to the candidate cell;

Optionally, the method further includes:

Update the dwell factor for any frequency point.

An illustration of several specific embodiments is given below.

Example 1: The dwell factor represents the probability.

For example, in a certain geographical area, the operator deploys several frequency points of three RATs of LTE, UMTS, and GERAN, and the absolute priority of the LTE frequency is set to be the highest, and the UMTS is second, and the GERAN has the lowest priority. The base station (including the base stations of LTE, UMTS, and GERAN) sets the dwell factor corresponding to all frequency points in LTE to 0.5, sets the dwell factor corresponding to all frequency points in UMTS to 0.8, and corresponds to all frequency points in GERAN. The retention factor is set to 1 and sent to the UE via a broadcast message.

The dwell factor in this embodiment is a value within a preset range, which is [0, 1]. Of course, the preset range may also be other numerical ranges, such as [10, 20] or [20, 30], etc., as long as the effect of the probability is exhibited.

Then, when the UE camping on the local cell performs selection and evaluation on the candidate cells of different RATs, the LTE candidate cell will be determined by the probability of 0.5, and for the UMTS candidate cell, the probability of 0.8 will be determined. For the GERAN candidate cell, the camping discrimination will be performed with probability 1.

The candidate cell in the embodiment of the present application may be a cell whose signal quality is higher than a preset signal quality threshold, where the signal quality threshold may be set according to actual needs, for example, may be set to -50 dB.

Assuming that a certain UE is performing cell selection, the UE generates a random number between [0, 1] for the LTE candidate cell with the highest absolute priority, and compares it with 0.5. If the random number is less than or equal to 0.5, the UE The camping is selected in the LTE candidate cell; if the random number is greater than 0.5, the second candidate cell with absolute priority is evaluated. If the candidate cell whose current absolute priority ranks in the second is a UMTS cell, the UE generates a random number between [0, 1], and compares with 0.8. If the random number is less than or equal to 0.8, the UE selects The cell camps; if the random number is greater than 0.8, the candidate cell with the absolute priority ranked third is evaluated. And so on. Until the cell selection is completed, a suitable cell is found for the UE to camp on.

In the embodiment of the present application, in addition to the system information broadcast mode, the base station may further notify the correspondence between the UE frequency point and the camping factor in the RRC connection release message (dedicated signaling), and the UE will release the camping factor and the RRC connection release message. The absolute priority corresponding to each RAT in the RAT or the absolute priority corresponding to each RAT in the system information is comprehensively considered to perform the selection of the cells of each frequency point in the subsequent different RATs.

Specifically, the absolute priority of the RAT lower frequency point may be sent to the UE by:

Common signaling (ie, system information broadcast) mode: common signaling provides absolute priority information of the current serving frequency, respective absolute priority information of other frequency points of E-UTRAN, and various frequency points of other RATs (segment ) their respective absolute priority information. Specifically, the E-UTRAN broadcasts the absolute priority of cell reselection at each frequency point on the air interface. These frequency points include frequency points of RATs such as E-UTRA, UTRA, and GERAN. For example, the eNB broadcasts the absolute priority information of the E-UTRA frequency in the SIB3/SIB4/SIB5, broadcasts the absolute priority information of the UTRA frequency in the SIB6, and broadcasts the absolute priority information of the GERAN frequency in the SIB7, in the SIB8. Absolute priority information for broadcasting CDMA2000 frequencies. The absolute priority of the frequency point is represented by the numbers 0 to 7, with 7 being the highest priority and 0 being the lowest priority. The absolute priorities of the frequency points inside the same RAT can be configured to be the same or different. The absolute priorities of the frequencies of different RATs cannot be the same. For example, a certain frequency of E-UTRA is configured with a priority of 6, and the absolute priority of the frequency of other RATs cannot be configured to 6. In addition, the absolute priorities of the frequencies between different RATs cannot be mutually high or low, so that ping pong reselection is avoided.

Dedicated signaling mode: The RRC Connection Release message optionally carries an absolute priority list of other system frequency points and a corresponding validity period timer length. Compared with the information provided in the system information, the corresponding information unit content lacks the absolute priority of the service frequency, and the absolute priority effective time timer T320 is added. Specifically, when the E-UTRAN releases the UE connection, the cell reselection information used by the UE in the idle state may be sent in the RRC Connection Release message, where the absolute priority information of each RAT frequency point may be included. After the UE receives the absolute priority information of the frequency point sent by the RRC Connection Release message, the frequency absolute priority information in the system broadcast is ignored. When a certain condition is met, the UE deletes the absolute priority information of the frequency information delivered by the RRC Connection Release message, for example, when the UE enters the connected state, or the validity period of the absolute priority information of these frequency points has expired (T320 timeout).

Example 2: The dwell factor is multiplied by the priority.

For example, in a certain geographical area, the operator deploys several frequency points of three RATs of LTE, UMTS, and GERAN, and the absolute priority of the UMTS frequency is set to the highest (for example, 6), and the absolute priority of the LTE frequency is set. Secondly (for example, 5), the GERAN frequency has the lowest absolute priority (for example, 4). The base station (including the LTE, UMTS, and GERAN base stations) sets the dwell factor corresponding to all frequency points in UMTS to 0.8, sets the dwell factor corresponding to all frequency points in LTE to 1, and sets the corresponding frequency of all frequency points in GERAN. The retention factor is set to 1 and notified to the UE by a broadcast message.

A higher version of the UE residing in the cell (capable of acquiring a camping factor and using), in candidate cells for different RATs For the UMTS candidate cell, the evaluation value is 6*0.8=4.8, and for the LTE candidate cell, the evaluation value is 5*1=5, and for the GERAN candidate cell, the evaluation value is 4 *1=4. At this time, for a higher version of the UE, the LTE candidate cell has the highest priority, the UMTS is the second, and the GERAN is the lowest. Therefore, the UE selects the LTE candidate cell to camp according to the priority order determined by the foregoing evaluation value. The high version UE refers to a UE that can identify and use a camping factor, such as a UE of version 13 (Rel-13).

For a lower version of the UE, the cell selection is still performed according to the absolute priority of the frequency point. Therefore, the priority of the UMTS candidate cell is the highest, the priority of the LTE candidate cell is the second, and the priority of the GERAN candidate cell is the lowest. Therefore, the UE subsequently sorts according to the priority, and uses the traditional cell selection evaluation process to perform cell selection and camping. The lower version of the UE refers to a UE that cannot identify and use the camping factor, such as version 12 (Rel-12) and previous versions of the UE.

Since the camping factor is introduced, the candidate cells of the same RAT have different priorities for different versions of the UE. Therefore, different versions of the UE can be dispersed and camped in different RAT cells, thereby achieving load balancing. purpose.

Example 3: The dwell factor is superimposed on the signal quality.

For example, in a certain geographical area, the operator deploys several frequency points of three RATs of LTE, UMTS, and GERAN. The absolute priority of the LTE frequency is set to the highest, and the absolute priority of the UMTS frequency is followed by the GERAN frequency. The absolute priority of the point is the lowest. The base station (including the base stations of LTE, UMTS, and GERAN) sets the dwell factor corresponding to all frequency points in LTE to -3, sets the dwell factor corresponding to all frequency points in UMTS to -1, and corresponds all frequency points in GERAN. The resident factor is set to 0 and sent to the UE via a broadcast message.

a UE of a higher version residing in the cell (capable of acquiring a camping factor and using), when performing selection and evaluation on candidate cells of different RATs, the signal quality of the candidate cell and the dwell factor corresponding to the frequency point of the candidate cell The addition is performed, and the obtained sum value is taken as the evaluation value of the candidate cell. For LTE candidate cells, the signal quality will be reduced by 3 dB, and for UMTS candidate cells, the signal quality will be reduced by 1 dB, and for GERAN candidate cells, the signal quality will be unchanged. That is, the UE performs cell selection according to the signal quality adjusted by the camping factor, that is, performs cell selection according to the evaluation value corresponding to the candidate cell, and preferentially selects the candidate cell with the largest evaluation value to camp.

In this embodiment, the UE comprehensively considers the signal quality of the candidate cell and the camping factor corresponding to the frequency point of the candidate cell, performs cell selection evaluation on the cells of different access technologies, and then selects a suitable cell to camp.

Referring to FIG. 3, on the network side, a cell selection control apparatus provided by an embodiment of the present application includes:

a stagnation factor determining unit 301, configured to determine a correspondence between multiple frequency points and a stagnation factor, where frequency points corresponding to at least two different radio access technology RATs are different;

The notification unit 302 is configured to notify the user equipment UE of the correspondence between the multiple frequency points and the camping factor.

Optionally, the notification unit 302 is specifically configured to:

Optionally, when the notification unit 302 notifies the UE of the corresponding relationship between the multiple frequency points and the resident factor by the broadcast mode, the notification unit 302 notifies the UE of the correspondence between the multiple frequency points and the resident factor by using the system information; When the notification unit 302 notifies the UE of the correspondence between the multiple frequency points and the camping factor by using the dedicated signaling manner, the notification unit 302 connects the multiple frequency points with the RRC connection release message or the RRC connection reconfiguration message by the RRC connection reconfiguration message. The correspondence of the retention factors is notified to the UE.

Optionally, the camping factor determining unit 301 is further configured to: adjust a dwell factor corresponding to any frequency point;

The notification unit 302 is further configured to: notify the UE of the correspondence between any frequency point and the adjusted resident factor.

Optionally, the camping factor determining unit 301 may be a module such as a processor, and the notification unit 302 may be a module such as a transceiver.

Optionally, the cell selection control device provided by the embodiment of the present application may be a network device such as a base station.

Referring to FIG. 4, a cell selection apparatus according to an embodiment of the present application includes:

a resident factor determining unit 401, configured to determine a correspondence between multiple frequency points and a camping factor, where frequency points corresponding to frequency points in at least two different radio access technology RATs are different;

The reselecting unit 402 is configured to perform cell selection according to a correspondence between multiple frequency points and a camping factor.

Optionally, the dwell factor is a value within a preset range;

The reselecting unit 402 is specifically configured to: sort the candidate cells according to the highest to lowest order of the absolute priorities corresponding to each frequency point, and sequentially select the candidate cells in order from highest to lowest and determine whether to camp. To the currently selected candidate cell;

The reselecting unit 402 determines whether to camp on the currently selected candidate cell, and the method includes: the reselecting unit 402 generates a random number in the preset range, and the random number corresponds to the frequency point where the currently selected candidate cell is located. The retention factor is compared, and it is judged based on the comparison result whether to camp on the currently selected candidate cell.

Optionally, the reselecting unit 402 determines, according to the comparison result, whether to camp on the currently selected candidate cell, including:

When the random number is less than or equal to the camping factor corresponding to the frequency point of the currently selected candidate cell, determining to camp in the currently selected candidate cell; otherwise, the reselecting unit selects the order from the highest to the lowest according to the candidate cell ordering. A ranked candidate cell and determining whether to camp on the candidate cell.

Optionally, the reselecting unit 402 is specifically configured to:

For each candidate cell, the reselection unit multiplies the camping factor corresponding to the frequency point where the candidate cell is located by the absolute priority of the frequency point where the candidate cell is located, and uses the obtained product as the evaluation value corresponding to the candidate cell;

Optionally, the reselecting unit 402 is specifically configured to:

Optionally, the camping factor determining unit 401 is further configured to: update a camping factor corresponding to any frequency point.

Optionally, the camping factor determining unit 401 and the reselecting unit 402 may be modules such as a processor.

Optionally, the cell selection device provided by the embodiment of the present application may be a user equipment such as a UE.

As shown in FIG. 5, another cell selection apparatus provided by the embodiment of the present application includes:

The processor 701 is configured to read a program in the memory 704 and perform the following process:

Determining a correspondence between the multiple frequency points and the camping factor, wherein the frequency points corresponding to the frequency points of the at least two different radio access technology RATs are different; the cell selection is performed according to the correspondence between the multiple frequency points and the camping factors.

The transceiver 702 is configured to receive and transmit data under the control of the processor 701.

Optionally, the dwell factor is a value within a preset range;

The processor 701 is specifically configured to: sort the candidate cells according to the highest to lowest order of the absolute priorities corresponding to each frequency point, and sequentially select the candidate cells according to the order from highest to lowest and determine whether to camp on the candidate cells. Currently selected Candidate cell

The processor 701 is specifically configured to: when determining whether to camp on the currently selected candidate cell, generate a random number in a preset range, and the resident of the random number corresponding to the frequency point of the currently selected candidate cell The factors are compared, and it is judged based on the comparison result whether to camp on the currently selected candidate cell.

Optionally, the processor 701 is specifically configured to: when determining, according to the comparison result, whether to camp on the currently selected candidate cell, when the random number is less than or equal to a camping factor corresponding to a frequency point of the currently selected candidate cell, determining Residing in the currently selected candidate cell; otherwise, the reselecting unit selects the next ordered candidate cell in descending order of the candidate cell order and determines whether to camp on the candidate cell.

Optionally, the processor 701 is specifically configured to:

Optionally, the processor 701 is further configured to: update a camping factor corresponding to any frequency point.

In FIG. 7, a bus architecture (represented by bus 700), which may include any number of interconnected buses and bridges, will include one or more processors and memory 704 represented by general purpose processor 701. The various circuits of the memory are linked together. The bus 700 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art and, therefore, will not be further described herein. Bus interface 703 provides an interface between bus 700 and transceiver 702. Transceiver 702 can be an element or a plurality of elements, such as multiple receivers and transmitters, providing means for communicating with various other devices on a transmission medium. For example, transceiver 702 receives external data from other devices. The transceiver 702 is configured to send the processed data of the processor 701 to other devices. Depending on the nature of the computing system, a user interface 705 can also be provided, such as a keypad, display, speaker, microphone, joystick.

The processor 701 is responsible for managing the bus 700 and the usual processing, as described above for running a general purpose operating system. The memory 704 can be used to store data used by the processor 701 in performing operations.

Optionally, the processor 701 may be a CPU (Central Embedded Device), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or CPLD (Complex Programmable Logic Device).

In summary, in the embodiment of the present application, the base station notifies the UE of the camping factor corresponding to the frequency point of the different radio access technologies, and the UE considers the absolute priority and the camping factor of the cell frequency point when performing the inter-system cell selection evaluation. The result of the cell selection evaluation is obtained. The base station notifies the UE of the resident factor parameters of different access technologies by means of broadcast or dedicated signaling; wherein the broadcast is system information, and the dedicated signaling is an RRC connection release message or an RRC connection reconfiguration message; and different access technologies The camping factor may be RAT level or frequency level; the UE comprehensively considers the absolute priority and the camping factor of the cell frequency point, performs evaluation of cell selection of different access technologies, and the UE performs cell selection according to the evaluation result. And the camping, in addition, the base station may also adjust the camping factor corresponding to the frequency point according to the load condition of the cell and the neighboring access technology cell, and notify the UE.

Therefore, the embodiment of the present application can implement an offloading of an idle state UE to each RAT cell appropriately, and avoid a potential overload problem caused by a UE that resides in a high priority RAT/frequency point. The technical solutions provided by the embodiments of the present application can be applied to wireless communication systems such as LTE, UMTS, TD-SCDMA, CDMA2000, and GERAN.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing, such as a computer or other The instructions executed on the programmable device provide steps for implementing the functions specified in one or more blocks of the flowchart or in a flow or block of the flowchart.

It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

A cell selection control method, the method comprising:

The base station determines a correspondence between the multiple frequency points and the camping factor, wherein the frequency points corresponding to the frequency points of the at least two different radio access technology RATs are different;

The base station notifies the user equipment UE of the correspondence between the multiple frequency points and the camping factor.
The method according to claim 1, wherein all frequency points in any RAT correspond to the same camping factor; or, at least two frequency points in any RAT correspond to different camping factors.
The method according to claim 1, wherein the base station notifies the UE of the correspondence between the multiple frequency points and the camping factor, including:

The base station notifies the UE of the correspondence between multiple frequency points and the camping factor in a broadcast manner or through a dedicated signaling manner.
The method according to claim 3, wherein when the base station notifies the UE of the correspondence between the plurality of frequency points and the camping factor by broadcasting, the base station uses the system information to set a plurality of frequency points with the station Notifying the UE of the correspondence of the retention factors;

When the base station notifies the UE of the correspondence between the multiple frequency points and the camping factor by using the dedicated signaling manner, the base station uses the RRC connection release message or the RRC connection reconfiguration message to locate multiple frequency points. The correspondence of the retention factors is notified to the UE.
The method of claim 1 further comprising:

The base station adjusts a camping factor corresponding to any frequency point, and notifies the UE of the corresponding relationship between the frequency point and the adjusted camping factor.
A cell selection method, the method comprising:

The user equipment UE determines a correspondence between a plurality of frequency points and a camping factor, wherein the frequency points corresponding to the frequency points of the at least two different radio access technologies RATs are different;

The UE performs cell selection according to a correspondence between multiple frequency points and a camping factor.
The method according to claim 6, wherein all frequency points in any RAT have the same dwell factor; or, at least two frequency points in any RAT correspond to different dwell factors.
The method according to claim 6, wherein the dwell factor is a value within a preset range;

The UE performs cell selection according to a correspondence between multiple frequency points and a camping factor, including:

The UE sorts the candidate cells according to the highest priority of the absolute priority corresponding to each frequency point, and sequentially selects the candidate cells according to the order from highest to lowest and determines whether to camp on the currently selected candidate. Community

The determining, by the UE, whether to camp on the currently selected candidate cell includes: the UE is in the preset A random number is generated, and the random number is compared with a dwell factor corresponding to the frequency point of the currently selected candidate cell, and it is determined according to the comparison result whether to camp on the currently selected candidate cell.
The method according to claim 8, wherein the UE determines whether to camp on the currently selected candidate cell according to the comparison result, including:

When the random number is less than or equal to a camping factor corresponding to a frequency point of the currently selected candidate cell, determining to camp in the currently selected candidate cell; otherwise, the UE is sorted according to the candidate cell in descending order The next ordered candidate cell is selected and it is determined whether to camp on the candidate cell.
The method according to claim 6, wherein the UE performs cell selection according to a correspondence between multiple frequency points and a camping factor, including:

For each candidate cell, the UE multiplies the camping factor corresponding to the frequency point where the candidate cell is located by the absolute priority of the frequency point where the candidate cell is located, and uses the obtained product as the evaluation value corresponding to the candidate cell;

The UE selects the camping candidate cell according to the order of the evaluation values corresponding to the candidate cells.
The method according to claim 6, wherein the UE performs cell selection according to a correspondence between multiple frequency points and a camping factor, including:

For each candidate cell, the UE adds the camping factor corresponding to the frequency point where the candidate cell is located to the signal quality of the candidate cell, and uses the obtained sum value as the evaluation value corresponding to the candidate cell;

The UE selects the camping candidate cell according to the order of the evaluation values corresponding to the candidate cells.
The method of any of claims 6-11, wherein the method further comprises:

Update the dwell factor for any frequency point.
A cell selection control device, the device comprising:

a resident factor determining unit, configured to determine a correspondence between multiple frequency points and a camping factor, where frequency points corresponding to frequency points in at least two different radio access technology RATs are different;

And a notification unit, configured to notify the user equipment UE of the correspondence between the multiple frequency points and the camping factor.
The apparatus according to claim 13, wherein all frequency points in any RAT correspond to the same camping factor; or, at least two frequency points in any RAT correspond to different camping factors.
The device according to claim 13, wherein the notification unit is specifically configured to:

The corresponding relationship between multiple frequency points and the camping factor is notified to the UE by broadcast or by dedicated signaling.
The device according to claim 15, wherein the notification unit is further configured to:

When the notification unit notifies the UE of the corresponding relationship between the multiple frequency points and the resident factor by the broadcast mode, the corresponding information of the multiple frequency points and the resident factor is notified to the UE by using the system information;

When the notification unit notifies the UE of the correspondence between the multiple frequency points and the camping factor by using a dedicated signaling manner, Notifying the UE of the correspondence between the multiple frequency points and the camping factor by the RRC connection release message or the RRC connection reconfiguration message.
The apparatus according to claim 13, wherein the camping factor determining unit is further configured to: adjust a dwell factor corresponding to any frequency point;

The notification unit is further configured to: notify the UE of the correspondence between any frequency point and the adjusted resident factor.
A cell selection device, the device comprising:

a resident factor determining unit, configured to determine a correspondence between multiple frequency points and a camping factor, where frequency points corresponding to frequency points in at least two different radio access technology RATs are different;

And a reselecting unit, configured to perform cell selection according to a correspondence between multiple frequency points and a dwell factor.
The apparatus according to claim 18, wherein all frequency points in any RAT correspond to the same camping factor; or, at least two frequency points in any RAT correspond to different camping factors.
The apparatus according to claim 18, wherein said dwell factor is a value within a preset range;

The reselecting unit is specifically configured to: sort the candidate cells according to the highest priority of the absolute priority corresponding to each frequency point, and select the candidate cells in order from highest to lowest and determine whether to camp. Retained to the currently selected candidate cell;

The reselection unit determines whether to camp on the currently selected candidate cell, and the method includes: the reselection unit generates a random number in the preset range, and the random number and the frequency of the currently selected candidate cell The dwell factor corresponding to the point is compared, and it is judged according to the comparison result whether to camp on the currently selected candidate cell.
The apparatus according to claim 20, wherein the reselecting unit is specifically configured to:

Determining whether to camp on the currently selected candidate cell when determining whether to camp on the currently selected candidate cell, when the random number is less than or equal to the camping factor corresponding to the frequency point of the currently selected candidate cell, determining to camp in the currently selected candidate cell; Otherwise, the reselection unit selects the next ordered candidate cell in order of candidate cell ordering from high to low and determines whether to camp on the candidate cell.
The device according to claim 18, wherein the reselecting unit is specifically configured to:

For each candidate cell, the reselection unit multiplies the camping factor corresponding to the frequency point where the candidate cell is located with the absolute priority of the frequency point where the candidate cell is located, and uses the obtained product as the evaluation corresponding to the candidate cell. Value; select the candidate cell to camp according to the order of the evaluation values corresponding to the candidate cells.
The device according to claim 18, wherein the reselecting unit is specifically configured to:

For each candidate cell, the camping factor corresponding to the frequency point of the candidate cell is added to the signal quality of the candidate cell, and the obtained sum value is used as an evaluation value corresponding to the candidate cell; according to the evaluation value corresponding to the candidate cell Select the candidate cell to camp from the largest to the smallest.
The apparatus according to any one of claims 18 to 23, wherein the resident factor determining unit is further configured to: update a resident factor corresponding to any frequency point.