WO2019026324A1

WO2019026324A1 - Base station device for establishing connection with terminal device, control method, and program

Info

Publication number: WO2019026324A1
Application number: PCT/JP2018/009116
Authority: WO
Inventors: 泰樹鈴木; 洋樹武田
Original assignee: Kddi株式会社
Priority date: 2017-07-31
Filing date: 2018-03-09
Publication date: 2019-02-07
Also published as: JP6738307B2; JP2019029850A

Abstract

A base station device for executing processes for establishing a connection between a terminal device and a network in a radio resource control (RRC) layer, wherein the base station device receives a connection request including a connection establishment cause from the terminal device and processes the connection request on the basis of the establishment cause. Values indicating establishment causes are categorized into any of multiple groups, each corresponding to one or more causes. When the base station device does not support the establishment cause included with the connection request, a prescribed cause supported by the base station device and categorized in the group containing the value indicating the unsupported establishment cause is treated as the establishment cause. Accordingly, the base station device executes the processes for a connection with the terminal device.

Description

Base station apparatus for establishing connection with terminal apparatus, control method, and program

The present invention relates to a base station apparatus, a control method, and a program, and more particularly to connection control between a base station apparatus and a terminal apparatus.

A base station apparatus in a cellular communication system such as LTE (long term evolution) or 5G establishes a connection with a terminal apparatus in response to a connection request transmitted from the terminal apparatus. For example, when there is data to be transmitted, the terminal device transmits a connection request message to the base station device for transmission of the data. Also, when the terminal apparatus receives voice or data arrival to the own apparatus, the terminal apparatus transmits a connection request message to the base station apparatus in response to receiving a paging message from the network (for example, Mobility Management Entity (MME)). Send. The connection request is, for example, an RRC Connection Request message of a radio resource control (RRC) layer.

The RRC Connection Request message includes a connection establishment reason (Establishment Cause). According to this, for example, in a predetermined case such as disaster occurrence, the base station apparatus preferentially establishes connection of the establishment reason with high urgency, and establishes the connection of the establishment reason with low urgency. Connection control such as suppression can be executed.

At present, emergency calls, high priority access, access to terminals, call origination from terminals, transmission of data from terminals, etc. are defined as establishment reasons, and further establishment reasons according to future functional enhancements. Is expected to be added. In such a case, when the terminal device transmits an RRC Connection Request message for a newly defined establishment reason, the base station device can not interpret the contents and may not be able to establish a connection with the terminal device. is there. On the other hand, in the cited reference 1, when the base station apparatus receives the RRC Connection Request message of the establishment reason not supported, the connection reason is established by treating the establishment reason as data transmission from the terminal. It describes a technique to prevent it from becoming impossible.

JP, 2017-103536, A

In the technique described in reference document 1, for example, a new establishment reason for an incoming call to a terminal is defined, and the base station apparatus can not interpret the establishment reason when the new establishment reason is used. , May be treated as originating from the terminal. In this case, for example, although the MME has transmitted the paging message to the terminal device, communication may not be possible due to the connection for the incoming call to the terminal device being not established.

The present invention enables a base station apparatus to establish a connection by an appropriate procedure even when receiving a connection request for an uninterpretable establishment reason.

A base station apparatus according to an aspect of the present invention is a base station apparatus that executes a process for establishing a connection with a terminal apparatus in a radio resource control (RRC) layer, and is connected from the terminal apparatus A receiving unit that receives a connection request for which an establishment reason is set; and a processing unit that processes the connection request based on the establishment reason, the establishment reasons respectively correspond to one or more reasons When the base station apparatus does not support the establishment reason set in the connection request, the processing means is classified into any one of a plurality of groups, and the predetermined reason in the group including the establishment reason is The present invention is characterized in that the processing is executed using as a reason for establishing a connection with the terminal device.

According to the present invention, even when the base station apparatus receives a connection request for an uninterpretable establishment reason, the connection can be established by an appropriate procedure.

Other features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings. In the attached drawings, the same or similar configurations are denoted by the same reference numerals.

The accompanying drawings are included in the specification, constitute a part thereof, show embodiments of the present invention, and are used together with the description to explain the principle of the present invention.
FIG. 1 is a diagram illustrating an exemplary configuration of a wireless communication system. FIG. 2 is a diagram for explaining the flow of conventional connection processing. FIG. 3A is a diagram showing an establishment reason and a configuration example of SST. FIG. 3B is a diagram showing an establishment reason and a configuration example of SST. FIG. 3C is a diagram showing an establishment reason and a configuration example of SST. FIG. 3D is a diagram illustrating an establishment reason and a configuration example of SST. FIG. 3E is a diagram showing an establishment reason and a configuration example of SST. FIG. 3F is a diagram showing an establishment reason and a configuration example of SST. FIG. 4 is a diagram illustrating an example of a hardware configuration of a base station apparatus. FIG. 5 is a diagram showing an example of a functional configuration of a base station apparatus. FIG. 6 is a diagram showing an example of the flow of processing performed by the base station apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Network configuration)
FIG. 1 shows an example of the configuration of a wireless communication system according to the present embodiment. The present wireless communication system is configured to include, for example, a base station apparatus, a terminal apparatus, and a network node (for example, Mobility Management Entity (MME)). A connection is established wirelessly between the base station device and the terminal device, and the base station device and the network node are connected by a line including, for example, wired and / or wireless. The terminal device is configured to be communicable with the network node via the base station device in one example. In addition, although a network node may be referred to as MME below in some cases, a network node other than MME may be used, and more broadly, the network node is read as a network such as a core network, for example. It is also good. That is, the function of the network node shown in FIG. 1 can be realized by one or more logical entities in the network.

In a wireless communication system, a base station apparatus performs processing for establishing a connection with a terminal apparatus in a radio resource control (RRC) layer. For example, the terminal device transmits a connection request (RRC Connection Request), and the base station device establishes an RRC connection with the terminal device accordingly. Note that a connection establishment reason (Establishment Cause) is set in the connection request, and the base station apparatus executes connection establishment processing based on the establishment reason.

When the base station apparatus does not support the establishment reason established in the connection request, the base station apparatus can perform connection processing by treating the establishment reason as another establishment reason. For example, the base station apparatus handles an unsupported establishment reason as data transmission (mo-Data) from the terminal apparatus. This allows the base station apparatus to establish a connection even for an establishment reason not supported. However, in this case, disadvantages may arise if, for example, a new establishment reason for an incoming call to a terminal is used.

For example, the incoming voice call at the terminal device is not currently defined as the establishment reason, but it is assumed that this is defined as the establishment reason, while the base station apparatus does not support this establishment reason. Do. In this case, as shown in FIG. 2, first, the MME notifies (through the base station apparatus) the terminal apparatus that there is an incoming voice call by a paging message (PCH, Paging Channel). After that, the MME waits for the connection for the incoming call at the terminal device to be established between the terminal device and the base station device. When receiving the PCH message, the terminal device transmits, to the base station device, a connection request (RRC Connection Request) in which a voice incoming call (mt-VoiceCall) in the own device is set as the establishment reason. Since the base station apparatus does not support this establishment reason, it is treated as data transmission (mo-Data) by the terminal and proceeds with the process, and finally, by the Initial UE message, the establishment reason is "mo-Data" and RRC Notify that a connection has been established. On the other hand, the MME does not determine that the connection notified by the base station apparatus and established with the establishment reason “mo-Data” is a connection by a paging message. That is, the MME is waiting for establishment of a connection for incoming call in the terminal device, and even if the connection for call origination by the terminal device is established, the connection is caused by the paging message transmitted earlier. Can not be judged. Therefore, for example, a time-out may occur in the MME, or an error may occur by receiving a service request message of an incoming call from a terminal device for which a connection for an incoming call should not be established in the MME.

In the present embodiment, the configuration of the establishment reason is changed so that such an error does not occur. That is, the values indicating the current state and the reason for establishment include values for which the corresponding reason for establishment is not defined for future function expansion and the like. This value is assigned in advance to the first group regarding the transmission of the terminal device and the second group regarding the incoming call in the terminal device. That is, under the present circumstances, the value indicating the establishment reason takes eight values from 0 to 7, and while the establishment reason is not defined in 6 and 7, the value "6" is assigned to the first group concerning transmission, Assign the value "7" to the second group for incoming calls. In addition, part of the values are already defined in establishment reasons (mo-Signalling, mo-Data) for origination of the terminal device and establishment reason (mt-Access) for arrival at the terminal device. Therefore, these establishment reasons are also classified into the first group and the second group, respectively. That is, a group including the already defined establishment reason and the undefined establishment reason is configured for each of the outgoing and incoming of the terminal device.

Then, when the base station apparatus does not support the establishment reason set in the connection request, the base station apparatus itself in the group including the establishment reason is supported by the predetermined reason supported by the terminal apparatus. Treat as the establishment reason and establish the connection. According to this, when the terminal apparatus sets a new establishment reason and transmits a connection request, the base station apparatus can respond to the establishment reason corresponding to the transmission by the terminal apparatus even if the base station apparatus does not support the establishment reason. For the establishment reason corresponding to the incoming call to the terminal apparatus, the connection process can be performed for the establishment reason corresponding to the other incoming call. As a result, in response to the paging message, the MME recognizes that at least the connection for the call reception has been established in the terminal device in order to receive the Initial UE message in which the establishment reason for the call reception in the terminal device is set. Can. At this time, the MME strictly recognizes that the connection having a reason different from the establishment reason transmitted in the paging message has been established. However, for example, by negotiating processing when the establishment reason is changed between the base station apparatus and the MME, the MME recognizes that the established connection is due to a paging message. it can. As a result, it is possible to prevent the occurrence of an error as described above.

In addition, when a new establishment reason is defined, according to these groups, for example, regarding the establishment reason for an incoming call at the terminal device, a value whose corresponding establishment reason for the second group is undefined is the new To be associated with the reason for establishing Here, it should be noted that although the establishment reason currently has only a value of 0 to 7, it may be expanded in the future and may have more values. That is, there may be many values for which the establishment reason is undefined. Therefore, the establishment reasons are classified into a plurality of groups so as to correspond to a large number of establishment reasons to be defined in the future, and the base station apparatus not supporting the establishment reasons is also suitable for the group It is beneficial to keep the connection established.

An example configuration of the establishment reason in the case of defining the group for outgoing call and the group for incoming call is shown in FIG. FIGS. 3A and 3B respectively show an example where the establishment reason is represented by 3 bits as in the present case and a case where the establishment reason is expanded to 4 bits. In addition, the element which is not underlined is an item currently defined as the establishment reason, and the item which is underlined shows the item for adapting to grouping by this embodiment.

In FIG. 3A, for example, mo-Data exists as an existing establishment reason when transmitting from a terminal device. On the other hand, mo-spare is defined as an item related to transmission from a terminal apparatus whose establishment reason is undefined. Although mo-spare is defined to be an establishment reason for transmission from a terminal device, the detailed establishment reason is an item for which the definition is not defined. In this embodiment, a group including mo-Data and mo-spare, which are establishment reasons for transmission from these terminal devices, is formed. The terminal can use the mo-spare's detailed establishment reason (for example, a terminal originating voice call) when it is newly defined in the future. When the base station apparatus receives a connection request for an establishment reason not supported by the own apparatus newly defined for mo-spare, the establishment reason is assumed to be mo-Data belonging to the same group It can be handled and proceeded. In this case, the base station apparatus transmits, to the MME, an Initial UE message including mo-Data as the establishment reason. Further, in FIG. 3A, mt-Access exists as the existing establishment reason for receiving a call at the terminal device. On the other hand, mt-spare is defined as an item related to an incoming call at a terminal whose establishment reason is not defined, and a group including mt-Access and mt-spare is formed. Thus, when the base station apparatus receives a connection request for an establishment reason not supported by the own apparatus newly defined for mt-spare, the establishment reason is mt-Access belonging to the same group It can be treated as a thing and processing can proceed. In this case, the base station apparatus transmits, to the MME, an Initial UE message including mt-Access as the establishment reason.

FIG. 3B is an example in which the establishment reason is expressed by 4 bits. In this case, ten reasons can be expressed in addition to the existing six reasons. In the example of FIG. 3B, the values corresponding to these ten reasons are five reasons each of which are undefined reasons (mo-spare) for origination by the terminal device and reasons for undefined termination at the terminal device ( mt-spare) and assigned. Note that the number of values to be assigned to the undefined reasons of each group may not be equal, and may be appropriately set according to the future availability. Also, values may be assigned to undefined reasons other than for outgoing and incoming calls. Furthermore, although FIGS. 3A and 3B show an example where the existing establishment reasons remain, it should be noted that these reasons may be deleted. That is, even in the case of FIG. 3A, three or more reasons which are undefined may be included. However, in this case as well, grouping is performed such that at least a part of the values indicating the undefined reasons belong to the same group as the values corresponding to the defined reasons.

Note that multiple groups do not have to be classified into outgoing and incoming groups, and classification may be performed on other measures. For example, as shown in FIG. 3C, the plurality of groups may include one or more groups classified according to connection priority. That is, for example, a plurality of first groups with high connection priority, a second group with low connection priorities, and a third group regarding the priorities not belonging to the first group and the second group are plural. It may be included in the group of In the example of FIG. 3C, “High-Priority-spare”, “Low-Priority-spare”, and “Mid−,” for the undefined reasons for the first group, the second group, and the third group, respectively. “Priority-spare” is shown. Note that the priorities may be determined, for example, in two or four or more steps, and the number of undefined reasons for each of the plurality of priorities may be different from one another.

Also, as shown in FIG. 3D, the plurality of groups may include, for example, one or more groups classified according to the application of communication. For example, for each application such as high-speed, large-capacity communication (for example, eMBB, enhanced mobile broad band), connection with multiple terminals (mMTC, massive machine type communication), ultra-reliable low-latency communication (URLLC, ultra-reliable and low latency communication) , Groups may be formed. In the example of FIG. 3D, “eMBB-spare”, “mMTC-spare” and “mTC-spare” are undefined reasons for the group of high-speed large-capacity communication, the group of connections by multiple terminals, and the group of ultra-reliable low-delay communication, respectively. And “URLLC-spare”. As applications, other applications may be used, and the number of undefined reasons for each of a plurality of applications may be different from each other.

Furthermore, as shown in FIG. 3E, the plurality of groups may include one or more groups classified according to the type of terminal to which a connection is to be established. For example, a group such as a group related to smartphones, a group related to wireless LAN routers, and a group related to subscriber premises equipment may be formed. In the example of FIG. 3E, “SP-spare”, “wRouter-spare”, and “CPE-spare” are the reasons for undefined regarding the group of smartphones, the group of wireless LAN routers, and the group of subscriber premises equipment, respectively. It shows by. In addition, the form of a terminal device may be classified into forms other than these, and the number of undefined reasons for each of a plurality of forms may be different from each other.

In addition, the above-mentioned various groups may coexist. For example, connection reasons where incoming and outgoing should be clearly distinguished are classified into groups regarding either outgoing or incoming, and connection reasons where incoming and outgoing do not need to be distinguished are classified into groups regarding priority etc. May be In addition, for example, only a group with high priority may be formed as the group regarding priority, and other connection reasons with low priority may be classified into groups not based on priority. Similarly, the group relating to the application of the communication and the form of the terminal device does not necessarily have to form a plurality of groups relating to the viewpoint if the viewpoint is used, but it is sufficient if one or more groups are formed.

Even if any group configuration is used, the value indicating the establishment reason is classified such that the value for which the establishment reason is not defined belongs to at least some of the groups. Then, when the base station apparatus receives a connection request in which a value for which the establishment reason is not defined is set, the base station apparatus receives it as a connection request for a predetermined reason supported by the base station apparatus itself in the group to which the value belongs. Handle the connection request and execute connection establishment processing. Thus, even if the base station does not support the establishment reason set by the terminal device, the connection is established for a predetermined reason corresponding to the establishment reason.

Although the reason for establishment has been described above, for example, the same method can be used for Slice Service Type (SST). That is, the network transmits, for example, a paging message in which SST is set to the terminal apparatus via the base station apparatus. Thereafter, RRC connection processing is performed between the terminal device and the base station device, and in the processing, the terminal device transmits, for example, the value of SST set in the paging message in an RRC Connection Setup Complete message . At this time, if the base station apparatus supports the SST in the message, it transmits an Initial UE message in which the SST is configured, but if the SST is not supported, the other supported apparatuses are supported. It is possible to transmit an Initial UE message in which SST is configured. However, if the SST set in the Initial UE message at this time is unrelated to the SST set in the paging message, an error may occur because a conflict with the SST managed by the network occurs.

Therefore, as in the case of the above-mentioned establishment reason, the values indicating the SST are classified into a plurality of groups relating to the same or related SSTs. When the base station apparatus receives a message in which the value of SST not supported is set, the message assumes that another SST supported by the apparatus is set in the group to which the value of SST belongs. Handle and continue the connection process. SST may, for example, relate to the above-mentioned communication application. In this case, as shown in FIG. 3F, for example, SSTs can be classified into high-speed large-capacity communication, connection by multiple terminals, ultra-reliable low-delay communication, etc., and can be grouped by classification. Also, SSTs may be classified, for example, by services such as voice calls, streaming of video and music, and grouped by classification. Note that various measures other than these measures can form a plurality of groups, each corresponding to at least one SST.

According to this, when the terminal apparatus sets up a new SST and transmits a message, the base station apparatus handles it as another SST corresponding to that SST, even if it does not support that SST, Connection processing can be performed. As a result, the network receives the Initial UE message in which the SST corresponding to the SST set in the paging message is set. At this time, the network strictly recognizes that a connection for an SST different from the SST transmitted in the paging message has been established. However, the network can recognize that the established connection is due to a paging message, for example, by negotiating processing when the SST is changed between the base station apparatus and the network. .

The establishment reason and the SST may be associated with each other. In this case, when a terminal apparatus requests connection in a certain SST, the terminal apparatus transmits, to the base station apparatus, a connection request in which an establishment reason corresponding to the SST is set. For example, SST related to voice call service may correspond to a high priority establishment reason, and SST related to video streaming service may correspond to a low priority establishment reason. Note that this association may be performed, for example, for each network operator. Thereby, the network operator can customize the relationship between the service and the connection establishment reason, and for example, it is possible to realize service differentiation such as facilitating the use of communication for a predetermined service. . In addition, for example, in a mixed situation such as a concert venue, the priority of the voice call service may be lowered to increase the priority of the messaging service, or the relationship between the establishment reason and the SST may be changed according to the situation. . The association information between the establishment reason and the SST is notified to the terminal device, for example, by broadcast transmission from the base station device. Thereby, the terminal device sets the establishment reason and the SST based on the notified association information. The base station apparatus can select whether to accept or reject the connection request according to, for example, the degree of priority indicated by the establishment reason and the degree of congestion of the network.

Moreover, although application of the above-mentioned method to SST was described, it is also possible to apply this method to Call type, and it is also possible to associate an establishment reason with Call Type. In this case, when connecting with a certain Call type, the terminal apparatus transmits, to the base station apparatus, a connection request in which an establishment reason corresponding to that Call type is set. The association of the call type and the establishment reason may be performed, for example, for each network operator. In that case, the association information between the establishment reason and the Call type can be notified to the terminal device, for example, by being broadcasted from the base station device, as in the case of the above-mentioned SST.

(Device configuration)
Subsequently, a configuration of a base station apparatus that performs connection processing with a terminal apparatus based on the establishment reason and the like configured as described above will be described. FIG. 4 shows an example of the hardware configuration of the base station apparatus. In one example, the base station apparatus has a hardware configuration as shown in FIG. 4 and includes, for example, a CPU 401, a ROM 402, a RAM 403, an external storage device 404, and a communication device 405. In the base station apparatus, a program for realizing the functions of the base station apparatus as described above, which is recorded, for example, in any of the ROM 402, the RAM 403, and the external storage device 404, is executed by the CPU 401. The CPU 401 may be replaced by one or more processors such as an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), and a DSP (digital signal processor).

And a base station apparatus controls the communication apparatus 405, for example by CPU401, and communicates between a terminal device and a network node. In addition, in FIG. 4, although the base station apparatus has shown the schematic as it has one communication apparatus 405, it is not restricted to this. For example, the base station apparatus may have a communication device for communication with the terminal device and a communication device for communication with the network node.

The base station apparatus may be provided with dedicated hardware for executing each function, or may execute a part of the hardware and a computer that operates a program to execute the other part. Also, all functions may be performed by a computer and a program.

Subsequently, a functional configuration example of the base station apparatus will be described using FIG. The base station apparatus includes, in one example, a wireless communication unit 501, a determination unit 502, and a connection processing unit 503. The wireless communication unit 501 performs wireless communication for establishing a wireless connection with at least a terminal device. The determination unit 502 determines whether the base station apparatus itself supports the establishment reason set in the RRC Connection Request received from the terminal apparatus or the SST set in the RRC Connection Setup Complete. Based on the determination result of determination unit 502, connection processing unit 503 belongs to the same group as the establishment reason or SST and supports the base station apparatus itself as necessary as described above. Treat it as another establishment reason or SST, and execute the wireless connection process with the terminal device. For example, the connection processing unit 503 holds a value indicating the establishment reason or SST in the message received from the terminal device by the wireless communication unit 501. Then, if the determination unit 502 determines that the establishment reason or the SST is not supported, the connection processing unit 503 belongs to the same group as the unsupported establishment reason or the value of the SST by the base station apparatus while belonging to the same group. Replace with a value indicating other supported establishment reasons or SST. In addition, the base station apparatus is, for example, a correspondence table of a value corresponding to an unsupported establishment reason or SST and a value indicating a supported establishment reason and SST to be replaced when the value is received. May be held, and conversion processing may be performed according to the received establishment reason or the value indicating the SST. In this case, as in the determination unit 502, the function of determining whether the establishment reason or the SST is supported may be omitted.

(Flow of processing)
The example of the flow of the process which a base station apparatus performs to FIG. 6 is demonstrated. The base station apparatus first obtains, from the terminal apparatus, for example, an establishment reason in RRC Connection Request, and SST in RRC Connection Setup Complete (S601). Here, the base station apparatus may acquire both the establishment reason and the SST, or may acquire only one. Note that the terminal device can, for example, obtain and hold, in advance, information on the association between the establishment reason and the SST from the network. In this case, the terminal apparatus can notify both the establishment reason and the SST to the base station apparatus by being notified of one of the SST and the establishment reason, for example, by a paging message from the network.

After that, the base station apparatus determines whether the own apparatus supports the establishment reason or SST acquired in S601 (S602). Then, when the acquired establishment reason or SST is not supported (NO in S602), the base station apparatus belongs to the same group as the establishment reason or SST and the establishment reason supported by the base station apparatus itself or SST Execute / continue the corresponding connection process (S603). For example, it is assumed that the establishment reason is classified into a group regarding origination by the terminal device and a group regarding termination. In this case, if the base station apparatus does not support a new establishment reason for origination by the terminal apparatus, the base station apparatus performs connection processing based on another establishment reason for origination by the terminal apparatus supported by the own apparatus. sell. On the other hand, if the establishment reason or SST acquired in S601 is supported (YES in S602), the base station apparatus can execute / continue the connection process based on the acquired establishment reason or SST (S604).

As described above, the base station apparatus according to the present embodiment can appropriately establish a connection with a terminal apparatus even if it does not support a new establishment reason or SST, for example, establishment It is possible to prevent the occurrence of an error in the network due to a plagiarism of reason.

As mentioned above, although the typical composition and flow of processing concerning this embodiment were explained, these are only examples and various with respect to the embodiment described in this specification in the range described in the claim. Such variations and modifications are naturally included in the scope of the present invention.

The present invention is not limited to the above embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Accordingly, the following claims are attached to disclose the scope of the present invention.

The present application claims priority based on Japanese Patent Application No. 2017-148000 filed on July 31, 2017, the entire content of which is incorporated herein by reference.

Claims

A base station apparatus that executes a process for establishing a connection with a terminal apparatus in a radio resource control (RRC) layer,
A receiving unit configured to receive, from the terminal device, a connection request in which a connection establishment reason is set;
Processing means for processing the connection request based on the establishment reason;
Have
The value indicating the establishment reason is classified into one of a plurality of groups each corresponding to one or more reasons,
The processing means, when the base station apparatus does not support the establishment reason set in the connection request, a predetermined value supported by the base station apparatus in a group including a value indicating the establishment reason. Execute the process by treating the reason as the reason for establishing the connection with the terminal device;
A base station apparatus characterized in that.
The plurality of groups include a first group regarding origination by the terminal device and a second group regarding termination of the terminal device.
The base station apparatus according to claim 1, characterized in that:
The plurality of groups include one or more groups classified according to connection priority.
The base station apparatus according to claim 1 or 2, characterized in that:
The plurality of groups include one or more groups classified according to the use of communication,
The base station apparatus according to any one of claims 1 to 3, characterized in that:
The plurality of groups include one or more groups classified according to the form of a terminal to which a connection is to be established.
The base station apparatus according to any one of claims 1 to 4, characterized in that:
If the base station apparatus supports the establishment reason set in the connection request, the processing means executes the process based on the establishment reason.
The base station apparatus according to any one of claims 1 to 5, characterized in that:
A control method of a base station apparatus performing processing for establishing a connection between a terminal apparatus and a network in a radio resource control (RRC) layer,
Receiving from the terminal device a connection request in which a connection establishment reason is set;
Processing the connection request based on the establishment reason;
Including
The value indicating the establishment reason is classified into one of a plurality of groups each corresponding to one or more reasons,
When the base station apparatus does not support the establishment reason set in the connection request, the terminal apparatus supports a predetermined reason supported by the base station apparatus in a group including a value indicating the establishment reason. The above process is executed by being treated as a reason for establishing a connection with
Control method characterized by
In a computer provided in a base station apparatus that executes a process for establishing a connection between a terminal apparatus and a network in a radio resource control (RRC) layer,
A connection request with a connection establishment reason set is received from the terminal device,
Processing the connection request based on the establishment reason;
A program for
The value indicating the establishment reason is classified into one of a plurality of groups each corresponding to one or more reasons,
When the base station apparatus does not support the establishment reason set in the connection request, the terminal apparatus supports a predetermined reason supported by the base station apparatus in a group including a value indicating the establishment reason. The above process is executed by being treated as a reason for establishing a connection with
A program characterized by