Mobile communication system and mobile unit

Abstract

In a plurality of communication networks managed by different communication providers, when a roaming mobile unit communicates with a communication network PLMN in which the mobile unit roams, that communication network, disadvantageously, can know, as to the radio performance of the mobile unit, only the radio performance as informed by the mobile unit. If there exists any difference in possible radio performance between the communication network and the mobile unit, there may occur problems, such as a failure of or reduced possibility of user data channel establishment by the mobile unit and unintended operations on the network side, during the loaming operation. A mobile unit has an internal list of PLMN determination (30) and an internal list of radio performance (31). A network determining part (12) outputs detailed information of the communication network PLMN to which the mobile unit is to be connected, and the detailed information is used to decide the communication network PLMN to which the mobile unit is to be connected. A radio performance selecting part (13) selects, from the internal list of radio performance (31), radio performance values, and informs a radio performance report list to the decided communication network to which the mobile unit is to be connected.

Description

technical field [0001] The present invention relates to mobile communication systems and mobile devices. It relates in detail to a mobile communication system and a mobile device reporting wireless capabilities to a communication network. Background technique [0002] When a mobile device establishes a wireless link and a user data channel from a standby state (including power-on), in order to allocate radio resources corresponding to the wireless capability of the mobile device, the communication network needs to know the wireless capability of the mobile device. [0003] In order for the user to utilize various services, as a procedure of establishing a wireless link and establishing a user data channel, the mobile device reports its wireless capability to the communication network (Non-Patent Document 1). For example, according to the 3GPP specification, the information of the mobile device is reported to the communication network side (for example, Non-Patent Document 1...

AI Technical Summary

Problems solved by technology

[0016] In addition, in mobile devices, there are also cases where the supported wireless capabilities are slightly different due to the period when the mobile device manufacturer shipped the mobile device.

In the network on the roaming side, it is difficult to know the detailed differences in the radio capabilities of such mobile devices in detail

In this case, there is also a problem that the user data channel cannot be normally set, or the success rate of the user data channel establishment is lowered.

Moreover, even after the wireless link is established, there is a possibility that the mobile device will perform actions not intended by the network side.

[0017] The object of the present invention is to solve the following problem: as described above, the mobile device when roaming is caused by the difference in wireless capabilities between the communication network and the mobile device. Failure in the establishment of the user data channel, or a decrease in the success rate of the establishment of the user data channel, or the problem that the mobile device performs an operation not intended by the network side

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