WO2009012678A1

WO2009012678A1 - Method, user terminal, network side device and wireless communication system for re-selection from a macro cell to a limited network

Info

Publication number: WO2009012678A1
Application number: PCT/CN2008/071374
Authority: WO
Inventors: Boyun Xie; Yinghui Yu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-07-25
Filing date: 2008-06-19
Publication date: 2009-01-29
Also published as: CN101355783A

Abstract

A method for re-selection from a macro cell to a limited network. The method includes the steps of: obtaining a re-selection threshold value of the limited network (101); measuring the limited network in the macro cell, and obtaining signal quality information of the limited network (102); determining if a user terminal UE should re-select to the limited network according to the signal quality information of the limited network and the re-selection threshold value of the limited network (103). And a user terminal, network side device and wireless communication system for re-selection from a macro cell to a limited network. Embodiments of this invention ensure UE could re-select to the limited network according to the re-selection threshold value in the greatest degree. If UE should re-select mainly depends on the situation of the limited network, and it is impossible to unable to re-select to the limited network because of the good signal quality of the macro cell.

Description

Method for reselecting from macro cell to restricted network, user terminal, network side device, and wireless communication system

The present invention relates to the field of mobile communication technologies, and in particular, to a method for reselecting from a macro cell to a restricted network, a user terminal, a network side device, and a wireless communication system.

Background technique

With the development of mobile communication systems, the quality of services that the system can provide is getting higher and higher. To keep

The long-term competitive advantage of 3GPP (The 3rd Generation Partnership Project), the standardization of Long Term Evolution (LTE) is underway.

In the LTE system, user requirements are becoming more and more diversified with the development of the system. System equipment has also diversified in order to meet this demand. The home indoor coverage base station, the enterprise-level internal coverage base station, and some other Limited network equipment came into being. These devices and their corresponding networks include: Home NodeB/Home eNodeB, Home Cell, Access Point, Private Network, Private Cell, Signing User groups (CSG, Closed Subscriber Group), etc., as well as restricted networks at specific frequency layers. These networks/cells only allow certain users with corresponding network rights to camp/access, and also require these users to camp/access in the public network, collectively referred to as restricted networks.

The coverage of such a restricted network is small and the number is relatively large, especially the number of indoor indoor coverage base stations is large. In this case, users belonging to the restricted network need to be effectively managed while minimizing the limited network. The impact of the increase in the public network load and other aspects. An important aspect of effective management of users belonging to a restricted network is the management of the user from the macro cell reselection to the restricted network.

A reselection scheme currently in the UMTS (Universal Mobile Telecommunications System) is when camped in a serving cell and is in an idle state. When the user equipment (UE) measures that the signal quality of the serving cell is lower than a certain threshold, the UE starts to measure the neighboring cell of the same-frequency/inter-frequency/extra-frequency system, and judges the neighboring cell signal according to the R criterion. , thereby determining whether to perform cell reselection. The R criterion is mainly: when the UE measures the neighboring cell, if the neighboring cell is considered to be better than the serving cell, or the signal quality is stronger, the neighboring cell is reselected.

In the process of implementing the present invention, the inventors have found that when the restricted network reselection is performed using the above reselection scheme, if the restricted network is located close to the center of the macro cell, the signal of the macro cell measured by the UE in the macro cell is The quality is almost higher than the threshold for starting the neighboring cell measurement, so the UE does not initiate measurements on the restricted network, and it is impossible to reselect the restricted network.

In addition, even if the signal quality of the serving cell is lower than the threshold for starting the neighbor cell measurement, and the UE initiates the measurement of the restricted network, the UE may not be stronger than the serving cell because the signal quality of the restricted network is not Reselect to a restricted network.

In the above two cases, the UE may not be able to reselect the restricted network signal quality even if the quality of the restricted network signal in or near the macro cell can meet the normal working needs of the UE. The internet.

In summary, there is currently no reselection method for the restricted network, which enables the UE to reselect to the restricted network with maximum priority when the macro cell has a strong signal quality when approaching the restricted network. Summary of the invention

The main technical problem to be solved by the embodiments of the present invention is to provide a method for reselecting from a macro cell to a restricted network, so that the UE can preferentially reselect to the restricted network when approaching the restricted network.

Embodiments of the present invention also provide a user terminal, a network side device, and a wireless communication system. In order to solve the above problems, the embodiments of the present invention provide the following technical solutions:

A method for reselecting a macro cell to a restricted network according to an embodiment of the present invention, the method includes: Whether the user terminal UE reselects to the restricted network.

A user terminal according to an embodiment of the present invention, where the user terminal includes: a reselection threshold acquisition module, a signal quality acquisition module, and a reselection determination module, where

a reselection threshold acquisition module, configured to acquire a reselection threshold of the restricted network;

a signal quality obtaining module, configured to measure a restricted network cell in a macro cell, to obtain signal quality information of the restricted network;

And a reselection determining module, configured to determine, according to the restricted network signal quality information of the signal quality acquiring module and the reselection threshold of the restricted network, whether the UE is reselected to the restricted network.

A network side device according to an embodiment of the present invention, where the network side device includes: a reselection threshold setting module and a sending module, where

A reselection threshold setting module is configured to set a reselection threshold of the restricted network, and send the reselection threshold through the sending module.

A wireless communication system according to an embodiment of the present invention, the system includes a user terminal UE, where the user terminal is configured to acquire a reselection threshold of a restricted network, and measure a restricted network cell in a macro cell, The signal quality information of the restricted network, and determining whether the UE is reselected to the restricted network according to the reselection threshold of the restricted network and the restricted network signal quality information.

In the embodiments of the present invention, the UE determines whether the UE needs to reselect to the restricted network according to the measured restricted network signal quality information and the reselection threshold of the restricted network acquired by the UE, thereby ensuring the UE. The reselection threshold is reselected to the restricted network to the greatest extent, and whether the UE is reselected depends mainly on the condition of the restricted network, and cannot be reselected to the restricted network because the macro cell signal quality is good.

Moreover, the UE prefers to the restricted network cell, and also reduces the load on the public network, and enables the user to enjoy the charging preferential service initiated by the service in the restricted network cell.

DRAWINGS

FIG. 1 is a schematic flowchart of a method for reselecting from a macro cell to a restricted network according to Embodiment 1 of the present invention; FIG. 2 is a schematic structural diagram of a user terminal according to Embodiment 3 of the present invention.

detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1

The implementation process of the method embodiment of the present invention is as shown in FIG. 1 , which corresponds to the following steps:

Step 101: Obtain a reselection threshold for reselecting to a restricted network.

The reselection threshold may specifically be a signal quality threshold.

If the obtained signal quality threshold is obtained, there are many ways to obtain it.

For example, the signal quality threshold that allows the reselection to the restricted network may be set by the network side of the public network, and the signal quality threshold is sent by the network side in the macro cell; the UE may send the message from the macro cell. Obtain the signal quality threshold in . The macro cell is a cell in which the UE currently camps. Specifically, the macro cell may broadcast the signal quality threshold in the range of the cell, and may broadcast the signal quality threshold by using a system message, where the signal quality threshold may be specifically set in the P-BCH or D- of the broadcast information. BCH. The network side of the public network can specifically set the same threshold for multiple restricted networks. The restricted network can also be classified, and a threshold is set for each type of restricted network. The network sets thresholds separately.

The signal quality threshold may also be set by the network side of the restricted network, and the signal quality threshold is sent by the network side in the restricted network cell, and the UE obtains the signal quality from the message sent by the restricted network. Threshold. Similarly, the specific sending manner may also be to broadcast the signal quality threshold, and the signal quality threshold may also be broadcast through a system message, and the signal quality threshold may be specifically set in the P-BCH or D-BCH of the broadcast information. in. Of course, the network side of the restricted network can also set the signal quality threshold of the other restricted network, and send the signal quality threshold to the UE. In this case, multiple restricted networks may be set to correspond to the same threshold; the restricted network may be classified, and a threshold is predefined for each type of restricted network; The network pre-defined thresholds. The threshold value may also be predefined for the restricted network in the UE, and the UE may directly acquire the signal quality threshold in the UE. The signal quality threshold can be modified according to the commands issued by the public network or the restricted network, or modified manually or by other means. In the case that the threshold is predefined in the UE, multiple restricted networks may be set to correspond to the same threshold. The restricted network may also be classified, and a threshold is predefined for each type of restricted network. ; You can also predefine thresholds for each of the restricted networks.

Whether it is set by the network side of the public network, the network side of the restricted network, or the predefined signal quality threshold in the UE, the signal quality threshold can be determined by the operator or through the network management. The setup can of course be jointly developed by the operator and the network administrator. For both the network side setting of the restricted network and the predefined threshold in the UE, the signal quality threshold may also be determined by the user based on the characteristics of the restricted network.

In addition, when the signal quality threshold is specifically set, it may be set according to information such as the transmit power and coverage of the restricted network cell. For example, the set threshold is to ensure that the transmit power and/or coverage of the restricted network can be Meet the normal use needs of the UE.

It should be noted that, in various embodiments of the present invention, the signal quality is collectively referred to as the measurement object (such as signal strength, signal quality, etc.) of the neighbor cell. There are different measurement objects for different wireless communication systems, not here - enumeration.

Step 102: Perform measurement on the restricted network cell in the macro cell, and obtain signal quality information of the restricted network cell.

This step is different from the prior art in that the prior art measures the restricted network cell when the signal quality of the macro cell is lower than a certain threshold; however, this step 102 does not need to perform the processing and is directly started.

In a specific implementation, in order to avoid unnecessary measurement by the UE when there is no restricted network in the vicinity, the UE may further determine whether there is a restricted network adjacent to the macro cell by using a correspondence between the macro cell and the neighboring restricted network cell, and After determining that there is an adjacent restricted network, the adjacent restricted network is determined to be a restricted network to be measured, and the determined restricted network is measured. For the LTE system, it replaces the LA (Location Area) in the UMTS system with a TA (Tracking Area). In this case, it is necessary to make unnecessary measurements when the UE has no restricted network nearby. The identifier of the TA where the macro cell adjacent to the restricted network cell that is allowed to access is located in the terminal may be recorded in the terminal. When the terminal determines that the information recorded by the terminal includes the identifier of the TA where the macro cell is located, the current need may be determined. The restricted network is measured and the restricted network cells around the macro cell are measured.

Step 103: Determine, according to the measured signal quality of the restricted network cell and the signal quality threshold obtained in step 101, whether the UE reselects to the restricted network.

Specifically, if the obtained signal quality threshold is obtained, step 103 is: determining whether the measured signal quality of the restricted network cell is greater than the acquired signal quality threshold, and if yes, determining the UE Reselect to the restricted network.

In addition, if a plurality of restricted networks that allow the UE to access are measured in step 103, the plurality of restricted network cell measurements may be compared and reselected to the optimal cell. Of course, it is also possible to reselect other options depending on the circumstances of these restricted networks.

Through the above process, the UE can be reselected to the restricted network according to the signal quality threshold, and whether the UE is reselected mainly depends on the condition of the restricted network, and the signal quality of the macro cell is not good. It is not possible to reselect to a restricted network.

And the UE prefers to the restricted network cell, which also reduces the load on the public network and enables the user to enjoy the charging preferential service for starting the service in the restricted network cell.

In addition, the order of the above steps 101 and 102 is not strictly limited, that is, step 101 may be performed first, or step 102 may be performed first, or both steps may be performed simultaneously.

Embodiment 2

Another method embodiment of the present invention is to determine based on an offset value (Qoffset) between a restricted network and a neighboring macro cell.

Specifically, the signal reselection threshold value obtained in the foregoing step 101 may specifically be an offset value (Qoffset) between the restricted network and the neighboring macro cell. In this case, due to the limited network The number is usually large, and the number of macro cells is small. Therefore, a preferred implementation is to set the Qoffset between the restricted network cell and the neighboring macro cell by the network side of the restricted network, and deliver the Qoffset. Similar to the foregoing signal quality threshold, the Qoffset can also be set and recorded in the UE. The Qoffset value can also be modified according to the information delivered by the restricted network, and can also be modified in other ways.

The specific setting of the Qoffset is also similar to the signal quality threshold, which can be determined by the operator, can also be set by the network management, or can be determined by the user according to the characteristics of the restricted network.

In the method embodiment, in addition to performing the foregoing step 102, that is, measuring the restricted network cell in the macro cell to obtain the signal quality information of the restricted network cell, it is also required to perform measurement on the macro cell signal quality.

Correspondingly, in the foregoing step 103, it is determined whether the UE reselects to the restricted network according to the measured signal quality and the reselection threshold of the restricted network cell, and specifically needs to perform judgment according to the signal quality of the macro cell. In this embodiment, the operations to be performed in the foregoing step 103 are specifically: determining the signal quality of the restricted network cell, the signal quality of the macro cell, and the acquired Qoffset according to the R criterion, and determining whether the UE is reselected to the Restricted network. Specifically, Rn may be calculated according to the signal quality of the restricted network and Qoffset, that is, Rn=Qmeasure, n-Qoffset, and Rs is calculated according to the signal quality of the macro cell, that is, Rs=Qmeasure, s+Qhyst, and if Rn>Rs, reselection is performed. .

In addition, similar to the method embodiment of the first embodiment, the foregoing obtaining the signal quality of the restricted network cell and the macro cell, and obtaining the Qoffset value are not particularly limited.

Through the above processing, the UE can be guaranteed to reselect to the restricted network according to the Qoffset between the restricted network and the macro cell, and whether the UE is reselected depends mainly on the limited network, and not because of the macro. The cell signal quality is good and cannot be reselected to the restricted network.

Similarly, the UE reduces the load on the public network from the macro cell preference to the restricted network cell, and the user enjoys the charging preference for starting the service in the restricted network cell as much as possible.

Those skilled in the art can understand that all or part of the steps in implementing the above method embodiments can be completed by program-related hardware. The software corresponding to the embodiment can be stored in a A computer can store the read media, such as ROM/RAM, disk, CD, and so on.

Embodiment 3

The user terminal structure of the device embodiment of the present invention is as shown in FIG. 2, and includes a reselection threshold acquisition module 201, a signal quality acquisition module 203, and a reselection determination module 202.

The reselection threshold acquiring module 201 is configured to acquire a reselection threshold of the restricted network cell. As described above, the reselection threshold may be a signal quality threshold of the restricted network cell, or may be a Qoffset value between the restricted network cell and the macro cell. The specific settings of the two reselection thresholds are as described above and will not be described here.

The signal quality obtaining module 203 is configured to measure the restricted network cell in the macro cell to obtain signal quality information of the restricted network.

For the signal quality acquisition module, in order to prevent the UE from performing measurement when there is no restricted network nearby, the module may further determine whether there is a neighbor adjacent to the macro cell by the correspondence between the macro cell and the neighboring restricted network cell. Limiting the network, and after determining that there are adjacent restricted networks, measuring the determined restricted network. In the LTE system, the TA identifier of the macro cell adjacent to the restricted network cell that is allowed to access may also be recorded in the terminal, so that the module may determine that the recorded information includes the TA where the macro cell is located. Identify, identify the current need to measure the restricted network.

In addition, for the signal quality acquisition module, if the reselection threshold acquisition module obtains the Qoffset value, the signal quality acquisition module also needs to perform measurement on the macro cell signal quality.

The reselection determining module 202 is configured to determine whether the UE is reselected to the restricted network according to the signal quality information of the restricted network cell measured by the signal quality acquiring module and the reselection threshold of the restricted network.

For the reselection decision module 202, if the reselection threshold of the restricted network is the signal quality threshold of the restricted network cell, the reselection determining module may specifically perform: determining the measured restricted network cell Whether the signal quality is greater than the obtained signal quality threshold, and if so, determine this If the reselection threshold of the restricted network is a Qoffset value between the restricted network cell and the macro cell, correspondingly, the signal quality acquiring module is further required to obtain the signal quality of the current macro cell, and the reselection determining module is specific. The method may be performed: determining, according to the R criterion, whether the UE is reselected to the restricted network according to the measured signal quality of the restricted network cell, the signal quality of the macro cell, and the acquired Qoffset.

In addition, for the reselection threshold acquisition module in the user terminal shown in FIG. 2, the reselection threshold of the restricted network may be saved by the UE itself, that is, the UE itself further includes a storage module, where Save the reselection threshold for the restricted network.

The reselection threshold of the restricted network may also be: obtained by using a message sent by the network side, and the network side may be the network side of the macro cell or the network side of the restricted network.

Through the UE shown in FIG. 2, the UE can be guaranteed to reselect to the restricted network to the greatest extent, and whether the UE is reselected depends mainly on the condition of the restricted network, and cannot be heavy because the quality of the macro cell signal is good. Select to a restricted network. Moreover, the UE prefers to the restricted network cell, and also reduces the load on the public network, and enables the user to enjoy the charging preferential service for starting the service in the restricted network cell.

In the case that the reselection threshold is sent through the network side, the network side device of the macro cell/restricted network of the device embodiment of the present invention needs to include a sending module and a reselection threshold determining module. The reselection threshold determining module of the network side device is configured to determine a reselection threshold of the restricted network, and send the threshold to the UE through the sending module. The network side device may specifically send the reselection threshold value by using a broadcast message. The reselection threshold may be sent in other manners. The specific delivery manner is not the focus of the embodiments of the present invention.

The reselection threshold determining module may specifically determine a signal quality threshold of the restricted network, and may also determine a Qoffset value between the restricted network and the macro cell. The specific settings of the signal quality threshold and the Qoffset value are as described above, and are not described here.

The UE provides a reselection threshold for the UE by using the network side device, and the UE may reselect to the restricted network according to the reselection threshold, and whether the UE is reselected depends mainly on the restricted network. It is not possible to reselect a restricted network because of the good quality of the macro cell signal. And, the UE prefers to The restricted network cell also reduces the load on the public network and allows the user to enjoy the charging preferential service for starting the service in the restricted network cell.

Embodiment 4

The present invention also provides an embodiment of a wireless communication system, and the user terminal in the embodiment of the wireless communication system is configured to acquire a reselection threshold of the restricted network, and measure the restricted network cell in the macro cell to obtain the received Limiting the signal quality information of the network, and determining whether the UE is reselected to the restricted network according to the reselection threshold of the restricted network and the restricted network signal quality information.

The user terminal may specifically include a reselection threshold acquisition module, a signal quality acquisition module, and a reselection determination module, and the connection relationship between the modules is as shown in FIG. 2 . The specific description of each module is as described above, and will not be described here.

In addition, the user terminal may further include a storage module, and the user terminal may obtain a reselection threshold from the storage module.

If the user terminal cannot obtain the reselection threshold from the UE, the reselection threshold needs to be obtained from the network side device. The network side device is used to set a reselection threshold of the restricted network, and sends the set reselection threshold. As described above, the network side device may specifically include a reselection threshold setting module and a sending module. The network side device may be a network side device of the macro cell or a network side device of the restricted network.

The reselection threshold set by the network side device may be a signal quality threshold of the restricted network or a Qoffset value between the restricted network and the macro cell, as described above. The specific setting manner is also as described above, and details are not described herein again.

Through the above system embodiment, the UE can be reselected to the restricted network to the greatest extent, and whether the UE is reselected depends mainly on the condition of the restricted network, and cannot be re-selected because the macro cell signal quality is good. Restricted network.

Although the invention has been illustrated and by reference to certain preferred embodiments of the invention It will be apparent to those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the invention.

Claims

Claim

A method for reselecting a macro cell to a restricted network, the method comprising: obtaining a reselection threshold of the restricted network;

Measure the restricted network in the macro cell to obtain signal quality information of the restricted network; determine the user terminal UE according to the signal quality information of the restricted network and the reselection threshold of the restricted network Whether to reselect to the restricted network.

The method for reselecting a macro cell to a restricted network according to claim 1, wherein the reselection threshold of the restricted network is: a signal quality threshold of the restricted network;

Determining whether the UE reselects to the restricted network according to the signal quality information of the restricted network and the reselection threshold of the restricted network is: if the measured signal quality of the restricted network is greater than the And a signal quality threshold, determining that the UE reselects to the restricted network.

The method for reselecting a macro cell to a restricted network according to claim 2, wherein the acquiring a signal quality threshold of the restricted network includes:

Transmitting, by the network side of the macro cell, a signal quality threshold allowing reselection to the restricted network within the macro cell;

Obtaining, by the UE, a signal quality threshold of the restricted network from a message sent by the macro cell; or

Sending, by the network side of the restricted network, a signal quality threshold that allows reselection to the restricted network in the restricted network;

Obtaining, by the UE, a signal quality threshold value of the restricted network from a message sent by the restricted network cell;

Or the method includes: the UE directly acquiring a signal quality threshold value of the restricted network saved in the UE.

The method for reselecting from a macro cell to a restricted network according to claim 2 or 3, wherein the signal quality threshold is set according to a transmit power and a coverage of the restricted network cell.

The method for reselecting from a macro cell to a restricted network according to claim 1, wherein the reselection threshold of the restricted network is: an offset between a macro cell and a restricted network. Qoffset; The method further includes: performing measurement on the macro cell in a macro cell, to obtain signal quality information of the macro cell;

Determining whether the UE reselects to the restricted network according to the restricted network signal quality information and the reselection threshold: according to the measured signal quality of the restricted network cell, the signal quality of the macro cell, and the Qoffset And determining whether the UE reselects to the restricted network.

The method for reselecting a macro cell to a restricted network according to claim 5, wherein the obtaining a Qoffset value between the macro cell and the restricted network includes:

Transmitting, by the network side of the restricted network, a Qoffset value between the restricted network and the macro cell in the restricted network cell;

Obtaining, by the UE, the Qoffset value from a message sent by the restricted network cell;

Or the method includes: the UE directly acquiring a Qoffset value between the restricted network and the macro cell saved in the UE.

The method for reselecting from a macro cell to a restricted network according to claim 1, wherein the reselection threshold of the restricted network is set by the network side, or set by a user, or set by the network management system. .

The method for reselecting from a macro cell to a restricted network according to claim 1, wherein the measuring the restricted network in the macro cell comprises: saving the macro cell and the adjacent restricted network Corresponding relationship of the cell determines whether there is a restricted network adjacent to the macro cell, and after determining that there is an adjacent restricted network, performing measurement on the restricted network;

Or the method of: searching for the identifier of the tracking area TA where the macro cell adjacent to the restricted network cell that the UE is allowed to access, and determining the identifier of the surrounding area of the macro cell when the identifier of the TA where the macro cell is located is found. Limit the network to measure.

A user terminal, comprising: a reselection threshold acquisition module (201), a signal quality acquisition module (203), and a reselection determination module (202), wherein

The reselection threshold acquisition module (201) is configured to acquire a reselection threshold of the restricted network; the signal quality acquisition module (203) is configured to measure the restricted network cell in the macro cell, Obtaining signal quality information of the restricted network;

The reselection determination module (202) is configured to determine whether the UE is reselected to the restricted network according to the restricted network signal quality information of the signal quality acquisition module and the reselection threshold of the restricted network.

10. The user terminal according to claim 9, wherein:

The reselection threshold obtaining module (201) is configured to acquire a signal quality threshold value of the restricted network; the reselection determining module (202) is configured to use the restricted network signal quality information and the restricted A signal quality threshold of the network, determining whether the UE is reselected to the restricted network.

11. The user terminal according to claim 9, wherein:

The reselection threshold acquisition module (201) is configured to acquire an offset value Qoffset between the restricted network and the macro cell;

The signal quality obtaining module (203) is further configured to acquire a signal quality of the macro cell; the reselection determining module (202) is configured to use the limited network signal quality information and the macro measured by the signal quality acquiring module. The signal quality information of the cell and the offset value Qoffset between the restricted network and the macro cell determine whether the UE is reselected to the restricted network.

12. The user terminal according to claim 9, 10 or 11, wherein

The signal quality obtaining module (203) is configured to determine, by using a correspondence between the saved macro cell and the neighboring restricted network cell, whether there is a restricted network adjacent to the macro cell, and determining that there is an adjacent restricted network. After performing measurement on the restricted network, obtaining signal quality of the restricted network;

Or for finding an identifier of a TA where a macro cell adjacent to a restricted network cell that allows the UE to access, and a limitation of the surrounding of the macro cell when finding the identifier of the TA where the macro cell is located The network performs measurements to obtain the signal quality of the restricted network.

13. The user terminal according to claim 9, 10 or 11, wherein

The reselection threshold obtaining module (201) is configured to obtain a reselection threshold of the restricted network from a message sent by the network side; or, to obtain a restricted network from a storage module of the UE Reselect the threshold.

A network side device, the network side device includes: a reselection threshold setting module and a sending module, where The reselection threshold setting module is configured to set a reselection threshold of the restricted network, and send the reselection threshold by using the sending module.

15. The network side device according to claim 14, wherein:

The reselection threshold setting module is further configured to set a signal quality threshold of the restricted network, and send the signal quality threshold of the restricted network through the sending module;

Or used to set Qoffset between the restricted network and the macro cell, and send the Qoffset through the sending module.

A wireless communication system, the system comprising a user terminal UE, the UE, configured to acquire a reselection threshold of a restricted network, and measure the restricted network cell in the macro cell, The signal quality information of the restricted network, and determining whether the UE is reselected to the restricted network according to the reselection threshold of the restricted network and the restricted network signal quality information.

17. The wireless communication system according to claim 16, wherein the system further comprises a network side device,

The network side device is configured to set a reselection threshold of the restricted network, and send the reselection threshold.