Communication system
A communication system is provided that can improve the communication capability of a communication terminal device in the case where a large number of small cells in addition to a macro cell are installed and operated. A communication terminal device (UE) is connected with a macro cell configured by a MeNB and a small cell configured by a SeNB, so that dual connectivity is performed. When receiving information for small cells, for example, emergency information from a CBC via an MME, at least one cell of the macro cell and the small cell notifies the communication terminal device connected with the at least one cell of the information for small cells.
1. A communication system comprising:
a communication terminal device; and
base station devices configuring cells capable of radio communication with said communication terminal device,
wherein
said cells include
a macro cell having a coverage in which communication with said communication terminal device is enabled, said coverage being relatively large, and
a small cell provided such that at least a part of said coverage of said small cell overlaps the coverage of said macro cell, said coverage of said small cell being relatively small, and
when said communication terminal device is connected to both of said macro cell and said small cell for dual connectivity, upon receipt of information for small cells directed to said small cell from a higher-layer device, at least one cell of said macro cell and said small cell notifies said communication terminal device connected with said at least one cell of said information for small cells, and
at least one cell of said macro cell and said small cell notifies said communication terminal device of broadcast indication information by a paging message before said communication terminal device is notified of said information for small cells, said broadcast indication information indicating that said information for small cells has been broadcast.
2. The communication system according to claim 1 , wherein said small cell notifies said communication terminal device of said broadcast indication information.
3. The communication system according to claim 1 , wherein said small cell notifies said communication terminal device of said broadcast indication information via said macro cell.
4. The communication system according to claim 1 , wherein said macro cell notifies said communication terminal device of said broadcast indication information.
5. The communication system according to claim 1 , wherein the information for small cells includes a Public Warning System (PWS) message that notifies the communication terminal device in a specific area of a warning message.