JP5977128B2 - Wireless communication system and wireless communication control method - Google Patents

Description

  The present invention relates to a wireless communication system and a wireless communication control method.

  M2M (Machine-to-Machine) is a system in which machines connected to a computer network exchange information with each other without human intervention, and automatic optimum control is performed. M2M is widespread, and it is expected that the number of M2M chips embedded in devices that do not have a handset will increase in the future.

  Patent Document 1 describes a method and apparatus for routing a message between an end node and an access node via another access node.

  Non-Patent Document 1 and the like have raised the problem of MTC (Machine Type Communication). The number of usage forms in which M2M chips are incorporated into devices is increasing, and base stations that communicate with portable devices also communicate with devices equipped with M2M chips (hereinafter referred to as M2M devices). Concentration of access to base stations is a concern.

Special table 2009-521846

3GPP R2-104550

  Here, it is assumed that the M2M device accesses the network on the assumption that the frequency of communication is not so high. When it is assumed that M2M devices have started accessing all at once for some reason, the resources of the control channel are insufficient, and the user terminal becomes difficult to access. Communication is not possible even though there is enough information channel capacity.

  The present invention has been made in view of such problems, and an object of the present invention is to prevent centralized access to a base station and to give priority to user terminals when crowded. An object of the present invention is to provide a wireless communication system and a wireless communication control method capable of performing a transmission process.

  To achieve the above object, the wireless communication system of the present invention is a wireless communication system including a dedicated terminal for wireless communication between devices, a user terminal used by a user, and a base station. When the communication via the base station is in a congested state, the base station once rejects the calling process of the user terminal and the dedicated terminal, and then receives the calling process of the user terminal with priority, and then the dedicated terminal. Is configured to accept outgoing calls.

  The radio communication system according to the present invention is configured such that each of the dedicated terminals is assigned to any of a plurality of groups, and the base station accepts the transmission processing of the dedicated terminals in the order of each group.

  The wireless communication control method of the present invention is a wireless communication control method of a wireless communication system including a dedicated terminal for wireless communication between devices, a user terminal used by a user, and a base station. When the communication via the network is in a congested state, the base station temporarily refuses the calling process of the user terminal and the dedicated terminal, and then accepts the calling process of the user terminal with priority, and then Receiving a call originating process of the terminal.

  The wireless communication system and the wireless communication control method of the present invention can prevent concentrated access to a base station and perform call processing with priority on a user terminal when crowded.

It is a figure which shows the structure of the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows operation | movement of the radio | wireless communications system which concerns on embodiment of this invention. It is a figure which shows the flowchart of operation | movement of the base station which concerns on embodiment of this invention. It is a figure which shows the information content of a connection request signal and a connection rejection signal.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a radio communication system according to an embodiment of the present invention.

  The radio communication system according to the embodiment of the present invention includes a base station 10, an M2M device 20, and a mobile device 30. In FIG. 1, a vehicle incorporating an M2M device 20 is shown. It is assumed that the number of M2M devices 20 is larger than that of the mobile device 30. Normally, it is assumed that the M2M device 30 performs communication with a lower frequency than the mobile device 30.

  First, if M2M devices start to access the base station 10 all at once due to some factor, the control channel resource becomes insufficient and the network becomes congested. Hereinafter, a case where communication via the base station 10 is in a congested state will be described.

  FIG. 2 is a diagram illustrating an operation of the radio communication system according to the embodiment of the present invention.

  When access concentrates on the base station (for example, when there is a predetermined number of accesses per second), the state of the base station becomes a congestion state (Busy). In addition, as shown in FIG. 2, when there is a notification from the network side, the base station 10 may be in a congestion state. Thereafter, the base station receives a connection request signal (Connection Request) transmitted from the terminal (M2M device 20 or portable device 30 in FIG. 1) as shown in FIG.

  FIG. 3 is a diagram showing a flowchart of the operation of the base station according to the embodiment of the present invention.

  When the base station receives the connection request signal (S1), the base station determines whether the terminal that transmitted the connection request signal is an M2M device (S2).

  When the terminal that transmitted the connection request signal is an M2M device, the base station sets the corresponding group number to the waiting group number (Waiting Group num) indicating the waiting group (S3), and includes the waiting group number in this terminal. A connection rejection signal (Connection Reject) is transmitted (S5).

  Updating may be performed by updating (incrementing) the corresponding group number once every several tens of seconds to several minutes. Further, the base station may give the same waiting group number to the M2M device according to the degree of congestion. For example, when not so crowded, the same waiting group number may be given to several tens of M2M devices, and when heavily crowded, one waiting group number may be given to only one M2M device. Even when the number of terminals to be accessed is large, the same waiting group number may be given to the M2M device, and the number of terminals assigned to one group may be varied according to the number of terminals to be accessed.

  If the terminal that transmitted the connection request signal is not an M2M device, the base station sets 0 as the waiting group number (S4), and sends a connection rejection signal including the waiting group number to this terminal (S5). In addition, the base station may set a waiting time (WaitTime) in addition to the waiting group number for the connection rejection signal.

  However, in the case of an emergency call transmission, the base station may be able to transmit a terminal that is not an M2M device. Here, the base station starts a timer (time T1) when a connection rejection signal is transmitted. The information contents of the connection request signal and the connection rejection signal are shown in FIG.

  When the T1 time of the timer has elapsed, the base station sets the target group number to the call group number (Call Group num) (S11) and broadcasts broadcast information (Broadcast Message) including the call group number (S12). ). Here, the target group number is initially set to 0, and increases by 1 every time the next time elapses. Therefore, since a terminal that is not an M2M device is assigned to No. 0, the call processing can be performed with priority. Note that the congestion state (Busy) of the base station can be canceled.

  As shown in FIG. 2, when a waiting group number is given to the message of the connection refusal signal, the terminal holds the waiting group number as long as it is registered in the base station or until a predetermined time is timed out. To do.

  The terminal monitors the call group number of the broadcast information broadcast. A terminal having the same waiting group number and calling group number (a terminal belonging to the same waiting group) transmits a connection request signal again to perform a calling process.

  As described above, when access is concentrated in the base station, the base station distributes the terminals to a plurality of waiting groups by adding a device to the signal between the base station and the terminal, so that the terminal can wait for itself. Since outgoing calls are processed in group order, concentration of access can be prevented. At this time, the call processing can be performed with priority given to the user terminal (mobile device 30).

  Since the ratio of emergency calls is different between the concentration of communication during a disaster and the concentration of communication during the year-end and New Year holidays and events, a standby group is specified because communication is concentrated only for emergency calls when communication is concentrated during a disaster. Unless it is made, it is impossible to make a call, but avoiding a situation where an emergency call cannot be made by frequently switching the designated standby group.

10 Base station 20 M2M equipment (dedicated terminal)
30 Mobile devices (user terminals)

Claims (3)

In a wireless communication system including a dedicated terminal for wireless communication between devices, a user terminal used by a user, and a base station,
If the communication through the base station is in a congested state, the base station once rejects the calling process of the user terminal and the dedicated terminal, and then after giving priority to the calling process of the user terminal, A wireless communication system that accepts a calling process of the dedicated terminal.   The wireless communication system according to claim 1, wherein each of the dedicated terminals is assigned to any of a plurality of groups, and the base station receives a transmission process of the dedicated terminals in order of each group. In a wireless communication control method for a wireless communication system including a dedicated terminal for wireless communication between devices, a user terminal used by a user, and a base station,
When communication via the base station is in a congested state, the base station temporarily rejects the calling process of the user terminal and the dedicated terminal, and then receives the calling process of the user terminal with priority. And a step of accepting a calling process of the dedicated terminal.

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