CN106793004B - MTC terminal network access control method and device - Google Patents
MTC terminal network access control method and device Download PDFInfo
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- CN106793004B CN106793004B CN201510823458.1A CN201510823458A CN106793004B CN 106793004 B CN106793004 B CN 106793004B CN 201510823458 A CN201510823458 A CN 201510823458A CN 106793004 B CN106793004 B CN 106793004B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
An MTC terminal network access control method and device are provided, the method comprises the following steps: sending an RRC connection reestablishment request to a network side to access a serving cell; when an RRC connection reestablishment rejection message sent by the network side is received, acquiring a neighbor cell list supporting MTC communication from the RRC connection reestablishment rejection message, wherein the neighbor cell list comprises neighbor cells of the service cell supporting MTC communication; attempting to access a cell in the neighbor cell list. By adopting the method and the device, the problem of high power consumption caused by frequent network finding and residing operations of the MTC terminal can be effectively avoided.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to an MTC terminal network access control method and device.
Background
In the existing scheme, in a Radio Resource Control (RRC) connection reestablishment process of a User Equipment (UE), if a network side does not correctly store context information of the UE, or when a current load of a cell is large, an RRC connection reestablishment request of the UE may be rejected. After detecting the connection reestablishment failure, the UE finds the network to camp on as soon as possible.
To meet the development of the Internet of Things (IoT), 3GPP introduced Machine Type Communication (MTC) technology on L TE technology evolution for Communication of low-power, low-cost electronic devices.
However, for the MTC terminal, when the MTC terminal is camped on a network, the cell on the high-priority frequency point included in the dedicated priority information is unavailable, and when the MTC terminal is unavailable, the MTC terminal needs to camp on a network again, and frequent network-seeking camping operation of the MTC terminal results in higher power consumption.
Disclosure of Invention
The invention solves the problem of high power consumption caused by frequent network finding and residing operations of the MTC terminal.
In order to solve the above technical problem, an embodiment of the present invention provides an MTC terminal network access control method, including:
sending an RRC connection reestablishment request to a network side to access a serving cell;
when an RRC connection reestablishment rejection message sent by the network side is received, acquiring a neighbor cell list supporting MTC communication from the RRC connection reestablishment rejection message, wherein the neighbor cell list comprises neighbor cells of the service cell supporting MTC communication;
attempting to access a cell in the neighbor cell list.
Optionally, the attempting to access the cell in the neighbor cell list includes: and trying to access the cells in the neighbor cell list according to the sequence of the priority of each cell in the neighbor cell list from high to low.
Optionally, the priority of each cell is set by the network side according to the load value of each cell, and the priority of each cell is inversely related to the corresponding load value.
Optionally, the method further includes: and when the attempt of accessing the cells in the neighbor cell list fails, performing full-frequency scanning operation to attempt to access the searched cells.
Optionally, the MTC terminal network access control method further includes: and when the neighbor cell list is not acquired from the RRC connection reestablishment rejection message, performing full-frequency scanning network operation to try to access the searched cell.
The embodiment of the invention also provides another MTC terminal network access control method, which comprises the following steps:
receiving an RRC connection reestablishment request of an access serving cell sent by the MTC terminal;
judging whether to reject the access of the MTC terminal;
when the access of the MTC terminal is rejected, generating a neighbor cell list, wherein the neighbor cell list comprises neighbor cells of the service cell supporting MTC communication;
and sending an RRC connection reestablishment rejection message to the MTC terminal, wherein the RRC connection reestablishment rejection message comprises the neighbor cell list.
Optionally, the generating the neighbor cell list includes: acquiring a load value corresponding to a neighbor cell supporting MTC communication corresponding to the serving cell; and adding the neighbor cell with the load value lower than the preset value into the neighbor cell list.
Optionally, the MTC terminal network access control method further includes: and setting the priority corresponding to each adjacent cell in the adjacent cell list, wherein the priority is inversely related to the load value corresponding to the adjacent cell.
The embodiment of the invention also provides an MTC terminal network access control device, which includes:
a first sending unit, configured to send an RRC connection reestablishment request to a network side to access a serving cell;
a first receiving unit, configured to receive an RRC connection reestablishment reject message sent by the network side;
an obtaining unit, configured to obtain a neighbor cell list supporting MTC communication from the RRC connection reestablishment reject message, where the neighbor cell list includes neighbor cells of the serving cell supporting MTC communication;
and the access unit is used for trying to access the cells in the neighbor cell list.
Optionally, the access unit is further configured to: and trying to access the cells in the neighbor cell list according to the sequence of the priority of each cell in the neighbor cell list from high to low.
Optionally, the priority of each cell is set by the network side according to the load value of each cell, and the priority of each cell is inversely related to the corresponding load value.
Optionally, the access unit is further configured to: and when the attempt of accessing the cells in the neighbor cell list fails, performing full-frequency scanning operation to attempt to access the searched cells.
Optionally, the access unit is further configured to: and when the neighbor cell list is not acquired from the RRC connection reestablishment rejection message, performing full-frequency scanning network operation to try to access the searched cell.
The embodiment of the invention also provides another MTC terminal network access control device, which includes:
a second receiving unit, configured to receive an RRC connection reestablishment request for accessing to a serving cell, where the request is sent by the MTC terminal;
the judging unit is used for judging whether to reject the access of the MTC terminal;
a generating unit, configured to generate a neighboring cell list when access of the MTC terminal is denied, where the neighboring cell list includes neighboring cells of the serving cell that support MTC communication;
a second sending unit, configured to send an RRC connection reestablishment reject message to the MTC terminal, where the RRC connection reestablishment reject message includes the neighbor cell list.
Optionally, the generating unit is configured to: acquiring a load value of a neighbor cell supporting MTC communication of the serving cell; and adding the neighbor cell with the load value lower than the preset value into the neighbor cell list.
Optionally, the MTC terminal network access control apparatus further includes: and the priority setting unit is used for setting the priority corresponding to each adjacent cell in the adjacent cell list, and the priority is inversely related to the load value corresponding to the adjacent cell.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
when receiving an RRC connection reestablishment reject message sent by a network side, namely when the network side rejects access, cell residence is tried according to a neighbor cell list carried in the RRC connection reestablishment reject message. Since the RRC connection reestablishment reject message carries the neighbor cell list, the MTC terminal does not need to perform full-frequency network scanning. Because the cells in the neighbor cell list support MTC communication, the MTC terminal does not need to blindly try to reside in all the cells on each frequency point, so that the network finding residence times of the MTC terminal can be reduced, and the power consumption of the MTC terminal is further reduced.
Further, the priority corresponding to each neighboring cell is set in the neighboring cell list, and the priority of the neighboring cell is inversely related to the load value, that is, the smaller the load value of the neighboring cell is, the higher the corresponding priority is. The MTC terminal preferentially tries to access the cell with high priority, namely preferentially tries to access the cell with low load value, so that the MTC terminal is prevented from being refused to access again due to the fact that the load value of the adjacent cell is large.
Drawings
Fig. 1 is a flowchart of an MTC terminal network access control method according to an embodiment of the present invention;
fig. 2 is a flowchart of another MTC terminal network access control method in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an MTC terminal network access control device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another MTC terminal network access control device in an embodiment of the present invention.
Detailed Description
In the existing scheme, after RRC connection reestablishment is rejected, the MTC terminal performs network finding and camping according to the existing cell selection method. However, in practical applications, the number of cells supporting MTC communications deployed by an operator is small, and an MTC terminal may search for a large number of cells not supporting MTC communications in a network searching process. The MTC terminal camps on the cells that do not support MTC communication, and obviously, the MTC terminal cannot camp on the cells that do not support MTC communication. If the MTC terminal frequently performs network discovery and camping on a cell that does not support MTC communication, power consumption of the MTC terminal may increase.
In the embodiment of the invention, when an RRC connection reestablishment rejection message sent by a network side is received, namely the network side rejects access, cell residence is tried according to a neighbor cell list carried in the RRC connection reestablishment rejection message. Since the RRC connection reestablishment reject message carries the neighbor cell list, the MTC terminal does not need to perform full-frequency network scanning. Because the cells in the neighbor cell list support MTC communication, the MTC terminal does not need to blindly try to reside in all the cells on each frequency point, so that the network finding residence times of the MTC terminal can be reduced, and the power consumption of the MTC terminal is further reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
An embodiment of the present invention provides an MTC terminal network access control method, which is described in detail below with reference to fig. 1 through specific steps.
Step S101, judging whether to send RRC connection reestablishment request to the network side.
In a specific implementation, when the MTC terminal fails to connect with the serving cell, a Radio Resource Control (RRC) connection reestablishment request may be initiated to the network side to request to re-access to the serving cell.
After sending the RRC connection reestablishment request to the network side, when the RRC connection reestablishment is not completed yet, that is, when the MTC terminal is waiting for the RRC connection reestablishment response message of the network side, step S102 may be executed; when receiving an RRC connection reestablishment response message from the network side or when not initiating an RRC connection reestablishment request to the MTC terminal, the operation procedure may be ended.
Step S102, judging whether receiving RRC connection reestablishment refusing information sent by the network side.
In specific implementation, the network side may determine whether to reject the operation of reestablishing the MTC terminal in the serving cell, that is, determine whether to reject the MTC terminal from accessing the serving cell, according to the current load state of the serving cell or the service priority of the MTC terminal. When the network side rejects the reestablishment operation of the MTC terminal in the serving cell, an RRC connection reestablishment reject message may be issued to the MTC terminal to inform the MTC terminal that the current serving cell rejects the reestablishment operation.
For example, when the MTC terminal is in the RRC connection reestablishment process, if the network side does not correctly store the context information of the UE, the network side may reject the RRC connection reestablishment request of the MTC terminal. For another example, when the network side detects that the current load value of the serving cell is high, in order to ensure that the service of the non-MTC terminal is performed normally, the re-establishment operation of the MTC terminal may be rejected.
After receiving the RRC connection reestablishment reject message sent by the network side, the MTC terminal may execute step S103; otherwise, the operation flow is ended.
Step S103, obtaining the adjacent cell list supporting MTC communication from the RRC connection reestablishment rejection message.
In the embodiment of the present invention, after determining to reject the connection reestablishment operation of the MTC terminal, the network side may carry, in the RRC connection reestablishment reject message, a frequency point supporting MTC communication around the serving cell and a cell list on the frequency point supporting MTC communication, that is, a neighbor cell list of the serving cell, where the neighbor cell list may include neighbor cells of one or more serving cells.
After receiving the RRC connection reestablishment reject message sent by the network side, the MTC terminal may obtain a neighbor list supporting MTC communication from the RRC connection reestablishment reject message. After the neighbor list is saved, step S104 is executed.
Step S104, trying to access the cell in the neighbor cell list.
In a specific implementation, after the neighbor cell list carried in the RRC connection reestablishment reject message is obtained, the access to the cells in the neighbor cell list may be sequentially attempted.
In the embodiment of the present invention, the cells in the neighbor cell list may be set with corresponding priorities. When trying to access to a cell in the neighbor cell list, the MTC terminal may preferentially select a cell with a high priority for trying to access according to the priority order. When the cell with the highest priority successfully tries to access, the cell does not need to continuously try to access other cells in the neighbor cell list. When the cell at the highest priority fails to attempt access, access may be attempted at the next highest priority cell. And repeating the steps until the MTC terminal is successfully accessed to a certain cell in the neighbor cell list.
The priority of the cells in the neighbor cell list may be preset by the network side. In the embodiment of the present invention, the network side may set the priority corresponding to each cell according to the current load value of the cell in the neighbor cell list. The priority corresponding to each cell may be inversely related to its current load value, where the meaning of the inverse relation is: the larger the current load value of the cell is, the lower the priority setting of the cell is; conversely, the smaller the current load value of the cell, the higher the priority setting.
The benefit of setting the cell priority according to the cell load value is: in the neighbor cell list, there may be a cell with a larger current load value, and in this case, if the cell with the larger current load value is set as a cell with a high priority, when there are multiple MTC terminals accessing, there may be a situation that network congestion is caused again, and there is still a possibility that access is denied. Therefore, by setting the cell with a lower load value as a high priority, the possibility that the MTC terminal is denied access because the cell load value is higher can be reduced.
In the embodiment of the present invention, when attempting to access a cell in a neighbor cell list, there may be a scenario where the MTC terminal fails to attempt to access all cells in the neighbor cell list, that is, the MTC terminal cannot access any cell in the neighbor cell list. In addition, a scene that the RRC connection reestablishment reject message does not carry the neighbor cell list may also exist, and at this time, the MTC terminal cannot obtain the neighbor cell list from the message.
Aiming at the two scenes, the MTC terminal can perform full-frequency network scanning only according to the existing scheme, and network residence operation is performed on the scanned frequency points in sequence. However, since many cells scanned by the MTC terminal do not support MTC communications, the MTC terminal needs to determine whether the cell supports MTC communications after finding the cell. If the MTC communication is supported, attempting to camp on; and if the MTC communication is not supported, selecting the next frequency point, and judging whether the selected frequency point supports the MTC communication again. Therefore, by adopting the existing scheme, the MTC terminal may find the cell residence supporting MTC communication after trying to camp in multiple cells, which results in larger power consumption of the MTC terminal.
In the embodiment of the present invention, when receiving an RRC connection reestablishment reject message sent by the network side, that is, when the network side rejects access, cell camping is attempted according to the neighbor cell list carried in the RRC connection reestablishment reject message. Since the RRC connection reestablishment reject message carries the neighbor cell list, the MTC terminal does not need to perform full-frequency network scanning. Because the cells in the neighbor cell list support MTC communication, the MTC terminal does not need to blindly try to reside in all the cells on each frequency point, so that the network finding residence times of the MTC terminal can be reduced, and the power consumption of the MTC terminal is further reduced.
An embodiment of the present invention provides another MTC terminal network access control method, which is described below with reference to fig. 2 through specific steps.
Step S201, determining whether an RRC connection reestablishment request for accessing to a serving cell sent by the MTC terminal is received.
In a specific implementation, before performing step S201, it may also be determined whether the current serving cell is a cell supporting MTC communication. Step S201 is executed when the serving cell is a cell supporting MTC communication; otherwise, when the serving cell is a cell that does not support MTC communication, the operation procedure in the embodiment of the present invention cannot be executed.
When receiving an RRC connection reestablishment request sent by the MTC terminal, step S202 may be performed; otherwise, when the RRC connection reestablishment request initiated by the MTC terminal is not received, step S201 may be repeatedly executed to detect whether the RRC connection request sent by the MTC terminal is received in real time.
Step S202, judging whether to reject the access of the MTC terminal.
In the embodiment of the invention, when the network side learns that the load value of the service cell is larger or the service level of the current MTC terminal is lower, the service is better provided for the non-MTC terminal, and the access of the MTC terminal can be rejected.
When the access of the MTC terminal is rejected, step S203 is performed; when the access of the MTC terminal is allowed, the service connection may be directly established with the MTC terminal, thereby ending the operation procedure.
Step S203, a neighbor list is generated.
In a specific implementation, the neighbor cell list may include neighbor cells of a serving cell supporting MTC communication.
In the embodiment of the present invention, when the network side generates the neighbor cell list, the network side may first obtain the load values of all the neighbor cells supporting MTC communications corresponding to the serving cell, then sequentially compare the load values of all the neighbor cells supporting MTC communications with a preset value, and add the neighbor cell having a load value lower than the preset value to the neighbor cell list, thereby generating the neighbor cell list.
The neighbor cell list may further include priority information corresponding to each cell. The network side can set the corresponding priority of each cell according to the current load value of the cell in the neighbor cell list. The larger the current load value of the cell is, the lower the priority setting of the cell is; conversely, the smaller the current load value of the cell, the higher the priority setting.
After the neighbor list is generated, step S204 is executed.
Step S204, an RRC connection reestablishment refusing message is sent to the MTC terminal.
In a specific implementation, the RRC connection reestablishment reject message sent to the MTC terminal may include the neighbor cell list generated in step S203. After receiving the neighbor cell list, the MTC terminal may attempt to access a cell in the neighbor cell list.
Referring to fig. 3, an MTC terminal network access control device 30 in the embodiment of the present invention is provided, including: a first sending unit 301, a first receiving unit 302, an obtaining unit 303, and an accessing unit 304, wherein:
a first sending unit 301, configured to send an RRC connection reestablishment request to a network side to access a serving cell;
a first receiving unit 302, configured to receive an RRC connection reestablishment reject message sent by the network side;
an obtaining unit 303, configured to obtain a neighboring cell list supporting MTC communication from the RRC connection reestablishment reject message, where the neighboring cell list includes a neighboring cell of the serving cell supporting MTC communication;
an accessing unit 304, configured to attempt to access a cell in the neighbor cell list.
In a specific implementation, the access unit 304 may further be configured to: and trying to access the cells in the neighbor cell list according to the sequence of the priority of each cell in the neighbor cell list from high to low.
In a specific implementation, the priority of each cell is set by the network side according to the load value of each cell, and the priority of each cell is inversely related to the corresponding load value.
In a specific implementation, the access unit 304 may further be configured to: and when the attempt of accessing the cells in the neighbor cell list fails, performing full-frequency scanning operation to attempt to access the searched cells.
In a specific implementation, the access unit 304 may further be configured to: and when the neighbor cell list is not acquired from the RRC connection reestablishment rejection message, performing full-frequency scanning network operation to try to access the searched cell.
Referring to fig. 4, another MTC terminal network access control apparatus 40 in the embodiment of the present invention is provided, including: a second receiving unit 401, a judging unit 402, a generating unit 403, and a second transmitting unit 404, wherein:
a second receiving unit 401, configured to receive an RRC connection reestablishment request for accessing to a serving cell, where the request is sent by the MTC terminal;
a determining unit 402, configured to determine whether to deny access of the MTC terminal;
a generating unit 403, configured to generate a neighboring cell list when access of the MTC terminal is denied, where the neighboring cell list includes neighboring cells of the serving cell that support MTC communication;
a second sending unit 404, configured to send an RRC connection reestablishment reject message to the MTC terminal, where the RRC connection reestablishment reject message includes the neighbor cell list.
In a specific implementation, the generating unit 403 may be configured to: acquiring a load value of a neighbor cell supporting MTC communication of the serving cell; and adding the neighbor cell with the load value lower than the preset value into the neighbor cell list.
In a specific implementation, the MTC terminal network access control device 40 may further include: a priority setting unit 405, configured to set a priority corresponding to each neighboring cell in the neighboring cell list, where the priority is inversely related to a load value corresponding to the neighboring cell.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. An MTC terminal network access control method is characterized by comprising the following steps:
sending an RRC connection reestablishment request to a network side to access a serving cell;
when an RRC connection reestablishment rejection message sent by the network side is received, acquiring a neighbor cell list supporting MTC communication from the RRC connection reestablishment rejection message, wherein the neighbor cell list comprises neighbor cells of the service cell supporting MTC communication;
attempting to access a cell in the neighbor cell list, comprising: trying to access the cells in the neighbor cell list according to the sequence of the priority of each cell in the neighbor cell list from high to low; the priority of each cell is set by the network side according to the load value of each cell, and the priority of each cell is inversely related to the corresponding load value.
2. The MTC terminal network access control method of claim 1, further comprising: and when the attempt of accessing the cells in the neighbor cell list fails, performing full-frequency scanning operation to attempt to access the searched cells.
3. The MTC terminal network access control method of claim 1, further comprising: and when the neighbor cell list is not acquired from the RRC connection reestablishment rejection message, performing full-frequency scanning network operation to try to access the searched cell.
4. An MTC terminal network access control method is characterized by comprising the following steps:
receiving an RRC connection reestablishment request of an access serving cell sent by the MTC terminal;
judging whether to reject the access of the MTC terminal;
when the access of the MTC terminal is rejected, generating a neighbor cell list, wherein the neighbor cell list comprises neighbor cells of the service cell supporting MTC communication; the generating the neighbor cell list comprises: acquiring a load value corresponding to a neighbor cell supporting MTC communication corresponding to the serving cell; adding the neighbor cell with the load value lower than a preset value into the neighbor cell list; setting the priority corresponding to each adjacent cell in the adjacent cell list, wherein the priority is inversely related to the load value corresponding to the adjacent cell;
and sending an RRC connection reestablishment rejection message to the MTC terminal, wherein the RRC connection reestablishment rejection message comprises the neighbor cell list.
5. An MTC terminal network access control apparatus, comprising:
a first sending unit, configured to send an RRC connection reestablishment request to a network side to access a serving cell;
a first receiving unit, configured to receive an RRC connection reestablishment reject message sent by the network side;
an obtaining unit, configured to obtain a neighbor cell list supporting MTC communication from the RRC connection reestablishment reject message, where the neighbor cell list includes neighbor cells of the serving cell supporting MTC communication;
an access unit, configured to attempt to access a cell in the neighbor cell list, including: trying to access the cells in the neighbor cell list according to the sequence of the priority of each cell in the neighbor cell list from high to low; the priority of each cell is set by the network side according to the load value of each cell, and the priority of each cell is inversely related to the corresponding load value.
6. The MTC terminal network access control device of claim 5, wherein the access unit is further configured to: and when the attempt of accessing the cells in the neighbor cell list fails, performing full-frequency scanning operation to attempt to access the searched cells.
7. The MTC terminal network access control device of claim 5, wherein the access unit is further configured to: and when the neighbor cell list is not acquired from the RRC connection reestablishment rejection message, performing full-frequency scanning network operation to try to access the searched cell.
8. An MTC terminal network access control apparatus, comprising:
a second receiving unit, configured to receive an RRC connection reestablishment request for accessing to a serving cell, where the request is sent by the MTC terminal;
the judging unit is used for judging whether to reject the access of the MTC terminal;
a generating unit, configured to generate a neighboring cell list when access of the MTC terminal is denied, where the neighboring cell list includes neighboring cells of the serving cell that support MTC communication; the generating the neighbor cell list comprises:
acquiring a load value corresponding to a neighbor cell supporting MTC communication corresponding to the serving cell; adding the neighbor cell with the load value lower than a preset value into the neighbor cell list; setting the priority corresponding to each adjacent cell in the adjacent cell list, wherein the priority is inversely related to the load value corresponding to the adjacent cell;
a second sending unit, configured to send an RRC connection reestablishment reject message to the MTC terminal, where the RRC connection reestablishment reject message includes the neighbor cell list.
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