WO2009138014A1

WO2009138014A1 - A cell reselection method and apparatus

Info

Publication number: WO2009138014A1
Application number: PCT/CN2009/071647
Authority: WO
Inventors: 秦钧; 赵旸; 王济勇; 余勇军
Original assignee: 华为技术有限公司
Priority date: 2008-05-12
Filing date: 2009-05-05
Publication date: 2009-11-19
Also published as: CN101583167A; BRPI0912543B1; CN101583167B; BRPI0912543A2

Abstract

A cell reselection method and apparatus comprise: after a terminal is residing in a target cell, performing the cell reselection based on the user priority parameters which is received by the terminal from the source cell before obtaining the user priority parameters distributed by the target cell. Because the embodiment of the present invention utilizes performing the priority cell reselection based on the user priority parameters distributed by the source cell before obtaining the user priority parameters distributed by the target cell, thereby enables the corresponding priority cell reselection procedure to choose more appropriate priority parameters accurately, and further enables the corresponding priority cell reselection procedure to choose the desired residence cell for the user.

Description

Method and device for cell reselection

[1] This application claims priority to Chinese Patent Application No. 200810106368.0, entitled "Cell Re-election Method and Apparatus", filed on May 12, 2008, the entire contents of In this application.

[2] Technical field

[3] The present invention relates to the field of wireless communication technologies, and in particular, to a cell reselection technique.

[4] Background of the invention

[5] Users in the wireless communication system, in order to carry out business needs, after starting up, need to select a PLMN

(Public Land Mobile

Network, public mobile network), and select a suitable cell to camp in the selected PLMN, and select the cell as the current serving cell. In the case where the various conditions do not change much, the terminal will remain in the selected cell unchanged, and continue to detect the cell reselection neighbor cell information indicated by the system message of the current serving cell. The user terminal sequentially measures the neighboring cells according to the received neighbor cell information, and searches for a more suitable cell in the neighboring cells (eg, the signal strength and signal quality are better than the signal strength and signal quality of the current serving cell, etc.) The user terminal will trigger a cell reselection to select a more suitable cell and camp when:

[6] (1) If a more suitable cell is found;

[7] (2) The current serving cell is prohibited;

[8] (3) The downlink of the current serving cell is faulty;

[9] (4) The signal variation of the current serving cell cannot guarantee the service, and so on.

[10] With the advent of 3G and LTE (Long Term Evolution) networks, in the case of multi-RAT (radio access technology) peer coverage, there has been a question of how users choose different RATs. Specifically, in the process of performing cell reselection, cell reselection may also be performed according to the corresponding priority parameter, and the corresponding priority parameter may include priorities of different RATs and priorities of different frequencies in the same RAT, and the like. The user (terminal) can perform a corresponding priority cell reselection operation according to the predetermined priority parameter and the threshold value of the relevant cell, thereby selecting the camped destination cell. [11] In the process of implementing the present invention, the inventors found that at least the following problems exist in the prior art:

[12] In the above prior art, only an implementation scheme that can perform priority cell reselection operations by using corresponding priority parameters is proposed, but does not provide after the terminal camps on a new cell (ie, a target cell). How to obtain the corresponding priority parameters that need to be applied in the cell reselection process in the target cell, and how to select and apply various obtained priority parameters, and the like.

[13] Summary of the invention

[14] Embodiments of the present invention provide a method and apparatus for cell reselection, so that a terminal camped on a new cell can obtain and use a corresponding priority parameter to reliably perform a corresponding priority cell weight. Select the operation.

[15] A method of cell reselection, comprising:

[16] After the terminal camps on the target cell, the cell reselection is performed according to the user priority parameter delivered by the source cell saved by the terminal before the user priority parameter sent by the target cell is obtained.

[17] A cell reselection device, comprising:

[18] The source cell parameter obtaining unit is configured to obtain a user priority parameter delivered by the source cell.

[19] The first cell reselection unit is configured to send, according to the source cell received by the source cell parameter acquiring unit, the source cell, after the terminal is camped on the target cell, before acquiring the user priority parameter sent by the target cell. The user priority parameter performs cell reselection.

[20] It can be seen from the technical solution provided by the foregoing embodiment of the present invention that the user priority parameter that is sent by the source cell is used before the user priority parameter that is sent by the target cell. The priority cell reselection operation is performed, so that a more suitable priority parameter can be accurately selected in the corresponding priority cell reselection process, so that the desired camping cell can be selected for the user by the corresponding priority cell reselection process.

[21] BRIEF DESCRIPTION OF THE DRAWINGS

[22] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those skilled in the art without any inventive labor.

FIG. 1 is a schematic diagram of a cell reselection process according to Embodiment 1; FIG. [24] FIG. 2 is a schematic diagram of a cell reselection process provided by Embodiment 2;

FIG. 3 is a schematic structural diagram 1 of a cell reselection apparatus according to an embodiment of the present invention; FIG.

FIG. 4 is a schematic structural diagram 2 of a cell reselection apparatus according to an embodiment of the present invention.

[27] Mode for carrying out the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

[29] After the terminal enters a certain cell, it can calculate whether to initiate the cell reselection process according to the cell reselection related parameters sent by the network and the measurement result of the neighboring cell in the neighbor cell list. In the embodiment of the present invention, before reselecting the terminal that is camped on the target cell, before acquiring the user priority parameter sent by the target cell, the cell reselection operation may be performed according to the user priority parameter delivered by the source cell obtained by the terminal.

[30] The priority parameter that can be obtained by the terminal may be, but is not limited to, including the public priority parameter, in addition to the user priority parameter. For this reason, the terminal camping in the new cell is different according to the obtained priority parameter. Specifically, the following scheme can be used for cell reselection:

[31] If the terminal has a valid user priority parameter delivered by the source cell, the cell reselection process is performed according to the user priority parameter delivered by the valid source cell in the target cell;

[32] The terminal determines whether the user priority parameter sent by the target cell is received, and if yes, performs cell reselection according to the user priority parameter delivered by the destination cell, otherwise, further determines whether the terminal has a valid source cell. The user priority parameter that is delivered: if yes, the cell reselection is performed according to the user priority parameter delivered by the valid source cell, otherwise, the cell reselection is performed according to the public priority parameter delivered by the target cell obtained by the terminal, That is, if the terminal only receives the public priority parameter delivered by the target cell, and there is no valid user priority parameter delivered by the source cell, the cell weight is determined according to the public priority parameter delivered by the target cell received by the terminal. selected.

[33] In the foregoing process, if the terminal has not received the user priority parameter or the common priority parameter delivered by the corresponding target cell in the target cell, that is, the priority parameter delivered in the target cell is not obtained. ), and the terminal does not have a valid user priority parameter delivered by the source cell, the terminal may specifically The common priority parameter delivered in the source cell performs cell reselection, or may also use a cell reselection mechanism that is not based on the priority parameter, for example, directly performs cell reselection according to the neighbor cell measurement result in the related neighbor cell list. , and many more.

[34] Optionally, in the foregoing process, for a terminal that is expected to camp in a new cell (the target cell), the public priority parameter sent by the source cell in the priority parameter that is sent by the source cell Specifically, after the terminal enters the target cell, the public priority parameter delivered by the corresponding source cell is deleted; or the priority parameter is received in the terminal, and the public priority parameter delivered by the corresponding source cell is deleted.

[35] Optionally, in the foregoing process, the user priority parameter delivered by the source cell in the priority parameter delivered by the source cell that is maintained by the terminal that is to be camped on the new cell (the target cell) Specifically, after the user priority parameter sent by the corresponding source cell is invalid, the user priority parameter sent by the source cell is deleted, or the user priority parameter that is sent by the target cell is deleted. The user priority parameter delivered by the corresponding source cell.

In the embodiment of the present invention, if the terminal does not support the priority-based cell reselection decision mechanism, the existing cell reselection mechanism may be used for cell reselection.

In order to facilitate the understanding of the embodiments of the present invention, the specific implementation process of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[38] Embodiment 1

[39] In this embodiment, the corresponding cell reselection process is as shown in FIG. 1 , and specifically includes:

[40] Step 101: The terminal that enters the target cell deletes the public priority parameter A delivered by the source cell.

[41] The terminal obtains only the common priority of the cell at the source cell, that is, the public priority parameter delivered by the source cell.

A, and after entering the destination cell, the public priority parameter A delivered by the source cell needs to be deleted;

[42] Step 102, determining whether the priority parameter is received, and if yes, performing step 104, otherwise, performing the step

103;

[43] Step 103: Perform an cell reselection operation by using an existing cell reselection mechanism.

[44] The existing cell reselection mechanism may be used before receiving any one of the public priority parameter B delivered by the destination cell or the user priority parameter Ub delivered by the destination cell. The terminal performs cell reselection. [45] Step 104: If it is determined that the priority parameter delivered by the target cell is received, it is determined whether the user priority parameter Ub delivered by the valid destination cell is received, and the user priority delivered by the corresponding destination cell is received. If the parameter Ub is valid, and the user priority parameter Ub delivered by the target cell is valid, step 105 is performed. Otherwise, the user priority parameter Ub delivered by the target cell is not received, or the user sent by the destination cell is received. The priority parameter Ub is invalid, and step 106 is performed;

[46] Step 105: Perform a corresponding cell reselection operation by using the user priority parameter Ub delivered by the target cell.

[47] That is, the public priority parameter B delivered by the destination cell and the user priority parameter Ub delivered by the destination cell are received, or the user priority parameter Ub delivered by the destination cell is received, and then the destination cell is delivered in the destination cell. The user priority parameter Ub during the lifetime of the Ub is used for cell reselection using the user priority parameter Ub delivered by the destination cell;

[48] In the process of performing the corresponding cell reselection operation by using the user priority parameter Ub delivered by the target cell, if the user priority parameter Ub delivered by the target cell is invalid (for example, the parameter corresponding to the parameter is super吋, etc., then step 108 is performed.

[49] Step 106, determining whether the user priority parameter Ua delivered by the source cell is valid, if yes, executing step 107, otherwise performing step 108;

[50] Step 107: Perform a cell reselection operation by using the user priority parameter Ua delivered by the source cell.

[51] After the terminal enters the target cell, the user priority parameter Ua delivered by the source cell in the source cell is still in the lifetime, and the user priority parameter Ua delivered by the source cell is still used. The corresponding cell reselection operation is performed until the user priority parameter Ua delivered by the corresponding source cell is no longer valid (if the corresponding timer T320 is exceeded), step 108 is performed.

[52] Step 108: Determine whether there is a public priority parameter B delivered by the destination cell. If yes, execute step 109. Otherwise, go to step 103.

[53] Step 109: Perform a cell reselection operation by using the public priority parameter B delivered by the corresponding destination cell. [54] Steps 108 and 109 show that the corresponding priority parameter is delivered by the corresponding destination cell. B is effective only after the user priority parameter Ub delivered by the destination cell or the user priority parameter Ua delivered by the source cell passes the lifetime, that is, the user priority parameter Ub delivered by the destination cell or the source cell is delivered. After the user priority parameter Ua has passed the lifetime, the target cell public priority B is used for cell reselection; if not received If the public priority parameter B delivered by the target cell does not exist, and the user priority parameter Ub delivered by the source cell or the user priority parameter Ua delivered by the source cell does not exist, the existing cell reselection mechanism may be used to perform the cell. Reselect the operation.

[55] It should be noted that, in the foregoing process, if the terminal does not obtain the public priority parameter A delivered by the source cell and the user priority parameter Ua delivered by the source cell in the source cell, the terminal I enters the destination in the terminal. After the cell, the public priority parameter B sent by the target cell carried in the system broadcast information is obtained, and the parameter is selected as the priority cell reselection, and if the target cell related to the user is also obtained from the dedicated signaling, The user priority parameter Ub is used as a parameter applied in the priority-based cell reselection process by using the user priority parameter Ub delivered by the target cell during the lifetime of the user priority parameter Ub delivered by the target cell.

[56] Example 2

[57] In this embodiment, the corresponding cell reselection process is as shown in FIG. 2, and specifically includes:

[58] Step 201, the terminal obtains the public priority parameter A delivered by the source cell in the source cell, and retains the public priority parameter A delivered by the source cell after entering the target cell;

[0] Step 202: Determine whether the priority parameter (including the user priority parameter and the public priority parameter delivered by the target cell) delivered by the target cell is received. If yes, go to step 204. Otherwise, go to step

203;

[60] Step 203: Perform cell reselection using the public priority parameter A delivered by the source cell before receiving the priority parameter delivered by the target cell.

[015] The processing procedure provided in step 204 to step 209 is similar to the processing procedure described in step 104 to step 109 in the first embodiment, and thus the description will not be repeated here.

[62] In the foregoing process, after the user priority parameter Ub delivered by the target cell is invalid, the cell priority re-selection is performed by using the user priority parameter Ua delivered by the source cell, and the user delivered by the source cell is preferentially selected. If the level parameter Ua is also invalid, the common priority parameter B delivered by the destination cell is used for cell reselection. If there is no public priority parameter B delivered by the destination cell, the public priority parameter A delivered by the source cell is used. Perform cell reselection.

[63] It should be noted that the sequence of the corresponding processing steps in the first embodiment and the second embodiment does not constitute the only limitation of the implementation provided by the embodiment of the present invention, that is, the embodiment of the present invention may also use other sequences. Process steps to achieve the same purpose. The embodiment of the present invention further provides a cell reselection device, and the specific implementation structure is as shown in FIG. 3, and may include:

[65] The source cell parameter obtaining unit 301 is configured to obtain a user priority parameter that is sent by the source cell, and may also be used to obtain a public priority parameter that is sent by the source cell.

[66] The first cell reselection unit 302 is configured to: after the terminal camps on the target cell, before acquiring the user priority parameter sent by the target cell, according to the source cell received by the source cell parameter acquiring unit 301 The user priority parameter is sent for cell reselection.

Optionally, as shown in FIG. 4, the apparatus further includes a target cell parameter obtaining unit 303, configured to acquire at least one of a user priority parameter and a public priority parameter delivered by the target cell; The device can also include:

[68] The first determining unit 304 is configured to determine whether the target cell parameter obtaining unit 301 receives the user priority parameter delivered by the target cell. Further, if the user priority parameter delivered by the target cell is valid and invalid, The first determining unit 304 is further configured to determine whether the user priority parameter sent by the target cell currently received by the target cell parameter acquiring unit is valid.

[69] The second cell reselecting unit 305 is configured to: after the first determining unit 304 determines the user priority parameter that is sent by the target cell, perform cell reselection according to the user priority parameter delivered by the target cell. Further, if the user priority parameter of the target cell is valid and invalid, the second cell reselecting unit 305 further determines that the user priority parameter delivered by the target cell is valid, according to the target cell. Sending user priority parameters for cell reselection;

[70] The second determining unit 306 is configured to determine, by the first determining unit 304, that the user priority parameter that is delivered by the target cell is not received, and determine whether there is a user priority parameter delivered by the valid source cell.

[71] The third cell reselecting unit 307 is configured to notify the first cell reselecting unit 302 when the second determining unit 306 determines that there is a user priority parameter delivered by the valid source cell, otherwise, according to The public priority parameter delivered by the target cell received by the target cell parameter acquiring unit 303 performs cell reselection.

[72] Further, as shown in FIG. 4, the apparatus may further include:

[73] The third determining unit 308 is configured to determine, in the second determining unit 306, that the user priority parameter that is sent by the target cell is not received by the target cell parameter acquiring unit 303, and that there is no user priority delivered by the active source cell. In the case of the level parameter, it is further determined whether it receives the public priority parameter delivered by the target cell. Number

[74] The fourth cell reselecting unit 309 is configured to determine, by the third determining unit 308, that the target cell parameter acquiring unit 303 does not receive the public priority parameter delivered by the target cell, and the second determining unit 306 determines There is no valid user priority parameter 下 delivered by the source cell, the cell reselection is performed according to the predetermined cell reselection mechanism based on the priority parameter, or the cell reselection is performed according to the common priority parameter delivered by the source cell.

[75] In order to facilitate the effective management of the corresponding priority parameters, as shown in FIG. 4, the device may also include at least one of the following units:

[76] The public priority parameter management unit 310 is configured to: after the terminal enters the target cell, delete the public priority parameter delivered by the source cell; or retain the public priority parameter delivered by the source cell, and only receive at the terminal And deleting at least one of a public priority parameter or a user priority parameter that is sent by the target cell, and deleting the public priority parameter delivered by the source cell.

[77] The user priority parameter management unit 311 is configured to: when the user priority parameter sent by the source cell of the terminal is invalid, delete the user priority parameter sent by the source cell; or, in the terminal receiving the priority parameter, User priority parameter 下 delivered by the destination cell, deleting the user priority parameter delivered by the source cell

[78] The foregoing cell reselection device may be specifically but not limited to being disposed in the terminal.

[79] It should be noted that those skilled in the art can understand that all or part of the steps of implementing the foregoing embodiments may be performed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. The program is executed in the steps including the above embodiments. The corresponding storage medium can be a read only memory, a magnetic disk or an optical disk.

[80] In summary, in the embodiment of the present invention, the cell reselection based on the priority cell reselection mechanism may be used, and the appropriate priority parameter may be selected for the cell reselection process. a priority parameter or a priority parameter, etc., so that the user (terminal) can reside in the desired cell as much as possible to carry out the corresponding service, for example, can enable the user to reside as much as possible to match the user's business habits. In the small area, and so on.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of within the technical scope disclosed by the present invention. Changes or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim

[1] A method for cell reselection, comprising:

After the terminal camps on the target cell, the cell reselection is performed according to the user priority parameter delivered by the source cell saved by the terminal before the user priority parameter sent by the target cell is obtained.

[2] The method according to claim 1, wherein the method further comprises:

After receiving the user priority parameter delivered by the target cell, the terminal performs cell reselection according to the user priority parameter delivered by the target cell; or, if the terminal only receives the public priority parameter delivered by the target cell, and If there is no valid user priority parameter delivered by the source cell, the cell reselection is performed according to the public priority parameter delivered by the target cell received by the terminal.

[3] The method according to claim 2, wherein the method further comprises:

If the terminal does not receive the user priority parameter and the public priority parameter delivered by the target cell, and the user does not have the user priority parameter delivered by the source cell, the terminal selects a cell reselection mechanism based on the predetermined non-priority parameter. The cell reselection is performed, or the cell reselection is performed according to the public priority parameter delivered by the source cell.

[4] The method according to claim 1, 2 or 3, wherein the method further comprises:

After the terminal enters the target cell, the public priority parameter sent by the source cell is deleted; or the terminal receives at least one of the public priority parameter or the user priority parameter delivered by the target cell, and deletes the source cell. Public priority parameter.

[5] The method according to claim 1, 2 or 3, wherein the method further comprises:

After the user priority parameter delivered by the source cell of the terminal is invalid, the user priority parameter sent by the source cell is deleted, or the user priority parameter sent by the target cell in the priority parameter is deleted. The user priority parameter delivered by the source cell.

[6] A cell reselection device, comprising:

The source cell parameter obtaining unit is configured to obtain a user priority parameter that is sent by the source cell, and the first cell reselecting unit is configured to: before the terminal camps on the target cell, before acquiring the user priority parameter sent by the target cell, The cell reselection is performed according to the user priority parameter delivered by the source cell received by the source cell parameter obtaining unit.

[7] The device according to claim 6, wherein the device further comprises a target cell parameter acquisition a unit, configured to acquire at least one of a user priority parameter and a public priority parameter delivered by the target cell;

And the device further includes:

a first determining unit, configured to determine whether the target cell parameter obtaining unit receives a user priority parameter delivered by the target cell;

a second cell reselection unit, configured to: after the first determining unit determines that the user priority parameter sent by the target cell is received, perform cell reselection according to the user priority parameter delivered by the target cell; And determining, by the first determining unit, that the user priority parameter that is sent by the target cell is not received, determining whether there is a valid user priority parameter delivered by the source cell; and the third cell reselecting unit is configured to Determining, by the second determining unit, that the user priority parameter sent by the source cell is valid, notifying the first cell reselecting unit, otherwise, according to the publicity delivered by the target cell received by the target cell parameter acquiring unit The priority parameter performs cell reselection.

[8] The device according to claim 7, wherein the device further comprises:

a third determining unit, configured to determine, by the first determining unit, that the target cell parameter acquiring unit does not receive the user priority parameter delivered by the target cell, and the second determining unit determines that there is no valid source cell delivered In the case of the user priority parameter, it is further determined whether it receives the public priority parameter delivered by the target cell;

a fourth cell reselecting unit, configured to determine, by the third determining unit, that the target cell parameter acquiring unit does not receive the public priority parameter that is sent by the target cell, and that there is no valid user priority parameter delivered by the source cell. And performing cell reselection according to a predetermined cell reselection mechanism that is not based on the priority parameter, or performing cell reselection according to a common priority parameter delivered by the source cell obtained by the source cell parameter acquiring unit.

[9] The device according to claim 6, 7 or 8, wherein the device further comprises:

a common priority parameter management unit, configured to: after the terminal enters the target cell, delete the public priority parameter sent by the source cell obtained by the source cell parameter acquiring unit; or retain the public priority parameter delivered by the source cell, and The public priority parameter delivered by the source cell is deleted only when the terminal receives at least one of the public priority parameter or the user priority parameter that is sent by the target cell.

[10] The method according to claim 6, 7 or 8, wherein the device further comprises: a user priority parameter management unit, configured to: after the user priority parameter sent by the source cell obtained by the source cell parameter acquiring unit is invalid, delete a user priority parameter sent by the source cell; or The user priority parameter 下 delivered by the target cell in the level parameter deletes the user priority parameter delivered by the source cell.