CN102209391A - Random access resource configuration method and device - Google Patents

Abstract

The embodiment of the present invention discloses a method and device for allocating random access resources, relates to the field of communication technology, and reduces the probability of conflicts between MTC devices in a group when randomly accessing a network. Including: receiving the first message sent by the MME that includes a target group identifier and a parameter of the number of MTC terminals for machine type communication, the target group identifier is used to identify the target group, and the parameter of the number of MTC terminals in the cell is used to indicate the the number of MTC terminals in the target group; adjust random access resources according to the number of MTC terminals in the first message; send a second message to all MTC terminals belonging to the target group identifier in the cell, and the second The message is used to instruct the MTC terminal to select and access from the adjusted random access resources. The embodiments of the present invention are mainly used in the technical field of communication.

Description

Method and device for allocating random access resources

technical field

The present invention relates to the field of communication technologies, in particular to a method and device for allocating random access resources.

Background technique

MTC (Machine Type Communications) applications refer to the network communication between one or more network elements without human participation, such as traffic control and management, factory monitoring, remote meter reading and other applications. In the above MTC application, when multiple MTC devices belong to one subscriber, all these MTC devices constitute a group of this subscriber.

The prior art realizes the above-mentioned group-based paging process as follows: MME (mobility management entity, mobile management entity) sends a paging message to a wireless access network node, and the wireless access network node broadcasts the random access resource allocated by it through a system broadcast message All terminal devices in the cell, and then, the terminal device will select a random access resource from the received broadcast message to initiate an access request to the network.

However, the inventors found that in the above-mentioned group-based paging process, when the MME pages all the MTC devices covered by the above-mentioned wireless access network point, a large number of MTC devices will randomly access the network in response to the paging. If access resources are limited, access conflicts will result.

Contents of the invention

Embodiments of the present invention provide a method and device for allocating random access resources, so as to reduce the probability of collisions when MTC devices randomly access a network.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

A method for allocating random access resources, comprising:

Receiving a first message sent by the MME that includes a target group identifier and a parameter of the number of MTC terminals, the target group identifier is used to identify the target group, and the parameter of the number of MTC terminals is used to indicate the MTCs belonging to the target group in the cell number of terminals;

adjusting random access resources according to the MTC terminal number parameter in the first message;

Sending a second message to all MTC terminals belonging to the target group in the cell, where the second message is used to instruct the MTC terminal to select and access from the adjusted random access resources.

A device for allocating random access resources, comprising:

The receiving unit is configured to receive a first message sent by the MME that includes a target group identifier and a parameter of the number of MTC terminals, the target group identifier is used to identify the target group, and the parameter of the number of MTC terminals is used to indicate that the cell belongs to the The number of MTC terminals in the target group;

An allocating unit, configured to adjust random access resources according to the MTC terminal number parameter in the first message;

a sending unit, configured to send a second message to all MTC terminals belonging to the target group in the cell, where the second message is used to instruct the MTC terminal to select from adjusted random access resources and access .

From the embodiment of the present invention described by the above technical solution, it can be known that the number of the MTC terminals belonging to the target group in the cell can be known from the target group identifier and the number of MTC terminal parameters in the received first message, Furthermore, the random access resources in the cell can be adjusted so that the adjusted random access resources can meet the access requests of all MTC terminals in the target group, reducing the occurrence of MTC terminals in the prior art when accessing. probability of conflict.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a flowchart of a method for allocating random access resources in Embodiment 1;

FIG. 2 is a structural diagram of an apparatus for allocating random access resources in Embodiment 1;

FIG. 3 is a flowchart of a method for allocating random access resources in Embodiment 2;

FIG. 4 is a flowchart of a method for allocating random access resources in Embodiment 2;

FIG. 5 is a flowchart of a method for allocating random access resources in Embodiment 2;

FIG. 6 is a flowchart of a method for allocating random access resources in Embodiment 2;

Fig. 7 is a structural diagram of an apparatus for allocating random access resources in Embodiment 2.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1:

In the application scenario of the embodiment of the present invention, multiple MTC terminals belonging to the same subscriber form a target group, and each target group of this type has a unique target group identifier, that is, the target group identifier is used to identify the target group . Multiple MTC terminals belonging to the same target group may be located in the same cell, or may be dispersed in multiple different cells. In the prior art, in the group-based paging process, the MME only sends a paging message to a radio access node to page all devices in the group, and the paging message only contains the group identifier, so From this group identifier alone, the wireless access node cannot know how many terminal devices will be paged in the area covered by the wireless access node, so there is not enough information to decide how many contention-based Random access resources are used by terminal devices to reduce the probability of random access collisions.

As shown in FIG. 1, an embodiment of the present invention provides a method for allocating random access resources, which includes the following steps:

101. Receive a first message including a target group identifier and a parameter of the number of MTC terminals, where the parameter of the number of MTC terminals is used to indicate the number of MTC terminals belonging to the target group in the current cell.

In an embodiment, the first message may be delivered by the MME. Since MTC terminal devices generally do not move, or move less frequently, or only move within a small area, MME can know the target when paging all MTC terminal devices belonging to the same target group Which wireless access network node each MTC terminal device in the group is currently within the coverage of.

The above-mentioned first message may be a trigger message. In one embodiment, the trigger message may be a paging message. For example, when the MME sends a paging message to a wireless access network point, the paging message will carry the target group identifier and the wireless access point. The number of MTC terminals belonging to the target group identifier within the network coverage area.

In one embodiment, the trigger message can also be a broadcast message or an MBMS (Multimedia Broadcasting/Multicast Service, Multimedia Broadcast Service) message or a CBS (cell broadcast service, cell broadcast service) message, so that the wireless access network point can transmit the message through the broadcast message or the MBMS message. or a CBS message to enable the MTC device to access the network. Of course, it can be understood that, in another embodiment, the trigger message may also be other messages that can trigger the terminal.

Of course it can be understood that, in another embodiment, the wireless access network point may also obtain the first message from a CBC (CellBroadcast Center, cell broadcast service center).

102. After the first message is received, the target group identifier and the parameter of the number of MTC terminals belonging to the target group may be obtained from the first message. Then, the random access resources are adjusted according to the parameter of the number of MTC terminals. The adjusted random access resources can meet the access requirements of all MTC terminal devices belonging to the above target group in the cell.

103. Send a second message to all MTC terminals belonging to the target group in the local cell, so as to wake up all the MTC terminals belonging to the target group in the local cell, and the second message may be a paging message. The second message is used to instruct the MTC terminal to select and access from adjusted random access resources.

It can be seen from the implementation process of the above method that after receiving the second message, the MTC terminal will select and access from the adjusted random access resources. Compared with the prior art where the MTC terminal still selects and accesses from the original limited random access resources, the collision probability when the MTC terminal initiates random access in response is reduced.

Correspondingly, the embodiment of the present invention also provides a device for allocating random access resources. As shown in FIG. 2 , the device includes: a receiving unit 21 , an allocating unit 22 and a sending unit 23 .

The receiving unit 21 is configured to receive the first message including the target group identifier and the parameters of the number of MTC terminals. The target group identifier and the number of MTC terminals can be obtained from the first message. The target group identifier is used to identify the target group, and the parameter of the number of MTC terminals is used to indicate the number of MTC terminals belonging to the target group in the current cell. The first message may be a trigger message, and the specific form of the trigger message has been described in detail in the foregoing embodiments, and will not be repeated here. In an embodiment, the first message may be delivered by the MME.

The allocating unit 22 is configured to adjust random access resources according to the parameter of the number of MTC terminals in the first message. The adjusted random access resources can satisfy the access requests of all MTC terminals belonging to the target group in the cell.

The sending unit 23 is configured to send a second message to all MTC terminals belonging to the target group identifier in the cell, the second message may be a paging message, and is used to instruct the MTC terminal to start from the adjusted random access Select and access resources.

The device for allocating random access resources in the embodiment of the present invention can adjust the random access resources according to the target group identifier and the number of MTC terminals, and notify the MTC terminals belonging to the target group in the cell through a second message The device performs access from the adjusted random access resources. Compared with the prior art, the probability of collision occurring when the MTC terminal accesses is reduced.

Example 2:

An embodiment of the present invention provides a method for allocating random access resources, as shown in FIG. 3 , the method includes the following steps:

301. The radio access network node receives the first message sent by the MME and includes the target group identifier (Group ID) and the MTC terminal number parameter (number).

Since MTC terminal devices generally do not move, or move less frequently, or only move within a small area, MME can know the target when paging all MTC terminal devices belonging to the same target group Which wireless access network node each MTC terminal device in the group is currently within the coverage of.

In one embodiment, the first message may be a trigger message. In one embodiment, the trigger message may be a paging message, for example, when the MME sends a paging message to a wireless access network point, it will carry the target group identifier and the number of MTC terminals in the paging message parameter. The number of MTC terminals belonging to the target group in the current cell is represented by the parameter of the number of MTC terminals. The parameter of the number of MTC terminals is a number or an index value representing a range. For example, if there are 20 MTC terminal devices belonging to this group within the area covered by the above-mentioned wireless access network point, then the MME may carry 20 to the wireless access network point in the above-mentioned first paging message, or may carry an index Value, this index value represents a number ranging from 10 to 30.

In an embodiment, the trigger message may also be a broadcast message or an MBMS message or a CBS message, so that the wireless access network point enables the MTC device to access the network through the broadcast message or the MBMS message or the CBS message. Of course, it can be understood that, in another embodiment, the trigger message may also be other messages that can trigger the terminal. Of course it can be understood that, in another embodiment, the wireless access network point may also obtain the first message from the CBC.

302. After receiving the first message, the wireless access network point may obtain the target group identifier and the parameter of the number of MTC terminals belonging to the target group from the first message. Then, the random access resources are adjusted according to the parameter of the number of MTC terminals.

In the specific implementation process, the following method can be adopted: first, the wireless access network point adaptively adjusts the random access resources in the system broadcast message according to the parameter of the number of MTC terminals in the first message, for example, the number of MTC terminals If the parameter is 20, then the random access resources in the system broadcast message can be increased accordingly, so that the adjusted random access resources can meet the access requirements of the 20 MTC terminals in the cell.

Then, the wireless access network point updates the system broadcast message, and notifies all terminal devices in the cell to obtain the updated system broadcast message.

303. The wireless access network point sends a second message to all MTC terminals belonging to the target group in the local cell, thereby waking up all the MTC terminals in the cell belonging to the target group, and the second message may be a paging message . The second message is used to instruct the MTC terminal to select and access from random access resources in the updated system broadcast message. In the specific implementation process, the system broadcast message notifying all terminal devices in the cell to obtain the update can be sent through an independent paging message, and the second message can also be sent through a paging message, Instructing the MTC terminal to select and access from the random access resources in the updated system broadcast message. Alternatively, in the same paging message, it is also possible to notify all terminal devices in the cell to obtain the updated system broadcast message and instruct the MTC terminal to select from the random access resources in the updated system broadcast message and access. Specifically, several paging messages are used to notify the update of the system broadcast message and instruct the terminal to intervene from the updated system broadcast message. There is no limitation here, as long as the above two operations can be realized. After receiving the second message, all the MTC terminals belonging to the target group in the local cell will select an appropriate random access resource from the random access resources in the updated system broadcast message to access.

In addition, in the specific implementation process, it is also possible to first send the second message to all MTC terminals belonging to the target group in the cell, and then adaptively adjust the random access rate in the system broadcast message according to the parameter of the number of MTC terminals. input resources, and update the system broadcast message. After the MTC terminal receives the second message, it will select and access from the random access resources in the updated system broadcast message. No matter which order is adopted to adjust the random resources, the access conflict of the MTC terminal can be reduced.

In the embodiment of the present invention, while reducing the access conflicts of the above-mentioned MTC devices, in order to reduce the paging of more terminal devices due to the update of the above-mentioned system broadcast messages, the above-mentioned method can also be changed, as shown in FIG. 4 , the above-mentioned Step 302 and step 303 in the method can also be replaced by the following step 302A and step 303A, so as to realize the adjustment of random access resources.

302A: The wireless access network point allocates dedicated random access resources according to the parameter of the number of MTC terminals in the first message. The dedicated random access resources are only provided to all MTC terminals belonging to the target group in the cell. In an embodiment, the above-mentioned dedicated random access resources may include: time-frequency resources, or preamble resources, or a combination of the former two.

303A: Then, the wireless access network point sends a second message including the dedicated random access resource to all MTC terminals in the cell belonging to the target group, where the second message may be a paging message.

For example, in an LTE system, the wireless access network point may be an eNB. In the second message, the eNB may use the parameter prach-configIndex to indicate which time domain and frequency domain resources are available, and use the parameter numberofRA-Preambles to indicate which preambles are available. The above-mentioned second message may also carry parameters for indicating that the allocated dedicated random access resource expires or how many consecutive radio frames are used for the dedicated random access and other parameters. When the dedicated random access resource expires, it will be released, so as to facilitate reuse by other terminal devices.

The second message is used to instruct the MTC terminal to select and access from the dedicated random access resources included in the second message. After receiving the second message, the MTC terminal will select a suitable access resource from the dedicated random access resources included in the second message to access the network.

The device for allocating random access resources in the embodiment of the present invention can adjust the random access resources according to the target group identifier and the number of MTC terminals, and notify the MTC terminals belonging to the target group in the cell through a second message The device performs access from the adjusted random access resources. Compared with the prior art, the probability of collision occurring when the MTC terminal accesses is reduced. Further, the method reduces the access conflicts of the MTC terminals by providing dedicated random access resources for all the MTC terminals in the target group, and at the same time reduces the updating of system broadcast messages by the wireless access network points.

In order to better reduce the random access conflicts that occur when a large number of MTC terminal devices in the target group respond to messages, and at the same time try to reduce the update of system messages, as shown in Figure 5, step 303A in the above method can also use the following step 303B to replace:

303B: The wireless access network point sends a second message including the dedicated random access resource to all MTC terminals in the cell belonging to the target group, the second message may be a paging message, and is used to indicate the The MTC terminal selects and accesses from the set consisting of the dedicated random access resources in the second message and the random access resources in the current system broadcast message.

For example, the subframes available for random access broadcast in the current system broadcast message are 0, 1, 2, and 3, and the subframes allocated by the radio access network node for this target group in the second message Frames are 4, 5, 6. In this way, after the MTC device terminals in the target group receive the second message, they can determine that the subframes they can select for random access are 0, 1, 2, 3, 4, 5, and 6. For the terminal devices in the non-target group, the random access subframes 0, 1, 2, and 3 in the current system broadcast message are still used as optional random access subframes. The above-mentioned second message may also carry parameters for indicating that the allocated dedicated random access resource expires or how many consecutive radio frames are used for the dedicated random access and other parameters. When the dedicated random access resource expires, it will be released, so as to facilitate reuse by other terminal devices.

In addition, the embodiment of the present invention also considers that in the method using the above step 303A or 303B, the MTC terminal equipment in the target group under the wireless access network node (that is, in the local cell) is in the optional random access resource Conflicts may also occur when a random access resource is selected, that is, several MTC terminal devices select the same resource for random access. Therefore, this embodiment also provides an improved method, as shown in FIG. 6, in the above steps Improvements are made on the basis of step 303A or step 303B to obtain the following step 303C.

303C: The wireless access network point B sends a second message including the dedicated random access resource and preset parameters to all MTC terminals in the cell belonging to the target group, the second message may be a paging message, The preset parameters are used for randomly accessing the network by the MTC terminal in a time domain.

In one embodiment, for example, in an LTE system, the wireless access network point may be an eNB. After the MTC terminal receives the second message, it can select according to the following method one: select a target access resource from the dedicated random access resources contained in the second message according to the preset parameters to perform access. The preset parameter may be a modulo parameter or a time parameter. For example, the MTC terminal device may perform M modulo on one of its own identifiers, and use the result as a basis for selecting random access resources. For example, when the obtained result is 5, it means that subframe 5 is selected. Alternatively, the MTC terminal device may perform M modulo on one of its own identifiers, and as a result, perform random access after delaying several radio frames. The first way is an improvement corresponding to step 303A.

Or, after the MTC terminal receives the second message, it can make a selection according to the following method two: according to the preset parameters, select from the dedicated random access resources contained in the second message and the current system broadcast message The target access resource is selected from the set of random access resources in the target access resource for access. The preset parameter may be a modulo parameter or a time parameter. The second method is an improvement corresponding to step 303B.

The device for allocating random access resources in the embodiment of the present invention can adjust the random access resources according to the target group identifier and the number of MTC terminals, and notify the MTC terminals belonging to the target group in the cell through a second message The device performs access from the adjusted random access resources. Compared with the prior art, the probability of collision occurring when the MTC terminal accesses is reduced. Further, the method reduces the access conflicts of the MTC terminals by providing dedicated random access resources for all the MTC terminals in the target group, and at the same time reduces the updating of system broadcast messages by the wireless access network points. Further, the second message instructs the MTC terminal to select and access from the set composed of the dedicated random access resource in the second message and the random access resource in the current system broadcast message, so as to better reduce the A large number of MTC terminal devices respond to random access collisions of messages, and at the same time try to reduce the update of system messages. Further, by including the preset parameters in the second message, the random access conflicts caused by a large number of MTC terminal devices in the target group responding to the message are further reduced.

Correspondingly, the embodiment of the present invention also provides a device for allocating random access resources. As shown in FIG. 7 , the device includes a receiving unit 41 , an allocating unit 42 and a sending unit 43 .

Wherein, the receiving unit 41 is configured to receive the first message sent by the MME including the target group identifier and the number of MTC terminal parameters. The first message may be a trigger message, and the form of the trigger message has been described in detail in the foregoing embodiments, and will not be repeated here.

The allocation unit 41 includes a first allocation module 41A, configured to adaptively adjust the random access resources in the system broadcast message according to the MTC terminal number parameter in the first message; update the system broadcast message; then the sending unit 43 is used to send a message notifying all terminal devices in the cell to acquire the updated system broadcast message. At this time, the sending unit 43 is also configured to send a second message to all MTC terminals belonging to the target group in the cell, and the second message may be a paging message, which is used to indicate that the MTC terminal is updated from Select and access from the random access resources in the system broadcast message. In a specific implementation process, the sending unit 43 may also send a paging message to notify the update of the system broadcast message and instruct the terminal to access from the updated system broadcast message.

Or, optionally, the allocating unit 41 includes a second allocating module 41B, configured to allocate dedicated random access resources according to the parameter of the number of MTC terminals in the first message. Correspondingly at this time, the sending unit 43 is configured to send a second message including the dedicated random access resource to all MTC terminals belonging to the target group in the cell, and at this time, the second message is used for Instructing the MTC terminal to select and access from the dedicated random access resources included in the second message. The device using the second allocation module 41B can reduce the frequency of updating system broadcast messages.

Or, optionally, after the above-mentioned second allocation module 41B allocates dedicated random access resources according to the MTC terminal number parameter in the first message, the sending unit 43 is configured to send the All MTC terminals send a second message containing the dedicated random access resource, at this time, the second message is used to instruct the MTC terminal to use the dedicated random access resource contained in the second message and the current system broadcast message Select and access from a set composed of random access resources in .

Or, optionally, after the above-mentioned second allocation module 41B allocates dedicated random access resources according to the MTC terminal number parameter in the first message, the sending unit 43 is configured to send the All the MTC terminals send the second message including the dedicated random access resources and preset parameters, and the preset parameters are used to distribute the MTC terminals randomly accessing the network in the time domain.

At this time, the second message is used to instruct the MTC terminal to select a target access resource to access from the dedicated random access resources contained in the second message according to the preset parameters, or to indicate the The MTC terminal selects a target access resource to access from the set consisting of the dedicated random access resource included in the second message and the random access resource in the current system broadcast message according to the preset parameter.

The device for allocating random access resources above can be a base station, etc., by adjusting the random access resources in the system broadcast message or reallocating dedicated random access resources, the access rate of all MTC terminal devices in the same group in the cell is reduced. conflict.

The embodiment of the present invention is mainly applied in the field of communication technology. The wireless access network node realizes the adaptive allocation of random access resources according to the number of MTC devices in the same group in the cell, reducing the number of MTC devices in the random access network. probability of a conflict occurring.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be realized by means of software plus necessary general-purpose hardware, and of course also by hardware, but in many cases the former is a better embodiment . Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, such as a floppy disk of a computer , a hard disk or an optical disk, etc., including several instructions for enabling a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (15)

1. A method for allocating random access resources, comprising: Receiving a first message including a target group identifier and a machine type communication MTC terminal number parameter, the target group identifier is used to identify the target group, and the MTC terminal number parameter is used to indicate the MTC terminals belonging to the target group in the cell number; adjusting random access resources according to the MTC terminal number parameter in the first message; Sending a second message to all MTC terminals belonging to the target group in the cell, where the second message is used to instruct the MTC terminal to select and access from the adjusted random access resources. 2. The method for allocating random access resources according to claim 1, characterized in that, the parameter of the number of MTC terminals is a number or an index value representing a range. 3. The method for allocating random access resources according to claim 1, characterized in that, The adjusting the random access resource according to the MTC terminal number parameter in the first message includes: adaptively adjusting the random access resource in the system broadcast message according to the MTC terminal number parameter in the first message; updating the System broadcast message; The method further includes: notifying all terminal devices in the cell to acquire updated system broadcast messages; The second message is used to instruct the MTC terminal to select and access from the adjusted random access resource, including: the second message is used to instruct the MTC terminal to select the random access resource in the updated system broadcast Choose from access resources and access them. 4. The method for allocating random access resources according to claim 1, characterized in that, The adjusting random access resources according to the parameter of the number of MTC terminals in the first message includes: allocating dedicated random access resources according to the parameter of the number of MTC terminals in the first message. 5. The method for allocating random access resources according to claim 4, characterized in that, The sending the second message to all the MTC terminals belonging to the target group in the local cell is: sending the second message including the dedicated random access resource to all the MTC terminals belonging to the target group in the local cell, The second message is used to instruct the MTC terminal to select and access from the dedicated random access resources included in the second message. 6. The method for allocating random access resources according to claim 4, characterized in that, The sending the second message to all the MTC terminals belonging to the target group in the local cell is: sending the second message including the dedicated random access resource to all the MTC terminals belonging to the target group in the local cell, The second message is used to instruct the MTC terminal to select and access from the set consisting of the dedicated random access resource in the second message and the random access resource in the current system broadcast message. 7. The method for allocating random access resources according to claim 4, characterized in that, The sending the second message to all MTC terminals belonging to the target group in the local cell is: sending a message containing the dedicated random access resources and preset parameters to all MTC terminals belonging to the target group in the local cell In the second message, the preset parameters are used to distribute the MTC terminal to randomly access the network in the time domain, The second message is used to instruct the MTC terminal to select a target access resource to access from the dedicated random access resources contained in the second message according to the preset parameters, or to instruct the MTC terminal to Selecting a target access resource for access according to the preset parameter from the set consisting of the dedicated random access resource included in the second message and the random access resource in the current system broadcast message. 8. The method for allocating random access resources according to any one of claims 5-7, wherein the second message further includes a parameter indicating that the use of the dedicated random access resources has expired , or a parameter used to indicate that a continuous preset number of radio frames are used as dedicated random access resources; The dedicated random access resources include time-frequency resources, or preamble resources, or a combination of the former two. 9. The method for allocating random access resources according to claim 1, wherein the first message includes a trigger message; and the trigger message includes: a paging message or a cell broadcast service message or a multimedia broadcast service message. 10. A device for allocating random access resources, comprising: A receiving unit, configured to receive a first message including a target group identifier and a parameter of the number of MTC terminals, the target group identifier is used to identify the target group, and the parameter of the number of MTC terminals is used to indicate that the number of MTC terminals in the cell belongs to the target group Number of MTC terminals; An allocating unit, configured to adjust random access resources according to the MTC terminal number parameter in the first message; a sending unit, configured to send a second message to all MTC terminals belonging to the target group in the cell, where the second message is used to instruct the MTC terminal to select from adjusted random access resources and access . 11. The apparatus for allocating random access resources according to claim 10, wherein the allocating unit includes a first allocating module for adaptively adjusting the system according to the parameter of the number of MTC terminals in the first message Random access resources in the broadcast message; updating the system broadcast message; The sending unit is also used to send a message notifying all terminal devices in the cell to obtain the updated system broadcast message; The second message sent by the sending unit is used to instruct the MTC terminal to select and access from the random access resources in the updated system broadcast message. 12. The device for allocating random access resources according to claim 10, wherein the allocating unit includes a second allocating module for allocating dedicated random access resources according to the parameter of the number of MTC terminals in the first message resource. 13. The device for allocating random access resources according to claim 12, characterized in that, The sending unit is configured to send a second message including the dedicated random access resource to all MTC terminals belonging to the target group in the cell, The second message is used to instruct the MTC terminal to select and access from the dedicated random access resources included in the second message. 14. The apparatus for allocating random access resources according to claim 12, characterized in that, The sending unit is configured to send a second message including the dedicated random access resource to all MTC terminals belonging to the target group in the cell, The second message is used to instruct the MTC terminal to select and access from the set consisting of the dedicated random access resources included in the second message and the random access resources in the current system broadcast message. 15. The apparatus for allocating random access resources according to claim 12, characterized in that, The sending unit is configured to send a second message including the dedicated random access resources and preset parameters to all MTC terminals belonging to the target group in the cell, and the preset parameters are used to send the MTC terminals to randomly accessing the network in time domain, The second message is used to instruct the MTC terminal to select a target access resource to access from the dedicated random access resources contained in the second message according to the preset parameters, or to instruct the MTC terminal to Selecting a target access resource for access according to the preset parameter from the set consisting of the dedicated random access resource included in the second message and the random access resource in the current system broadcast message.

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