Small base station apparatus, base station apparatus, mobile station apparatus, and mobile communication system

A mobile station apparatus connected to a base station apparatus, the mobile station comprising:

• a receiving unit configured to receive, from the base station apparatus, a connection release message instructing release of the connection, the message including cell information for causing the mobile station apparatus to start an initial access procedure for another preferable cell,
• wherein the cell information includes
• cell ID information and frequency information for specifying the preferable cell,
• broadcast information applied to the preferable cell detected by performing cell search, and
• preamble information used for the initial access procedure on the preferable cell;
• and
• a setting unit configured to apply the broadcast information to the preferable cell specified by the cell ID information and the frequency information in case where the preferable cell is detected by performing the cell search after release of the connection, wherein
• the broadcast information includes access restriction information,
• in a case where the access restriction information indicates an access restriction associated with Closed Subscriber Group (CSG) cell, and
• the CSG cell is configured to restrict the access of the mobile station apparatus that are not being registered.

A communication method performed by a base station apparatus, wherein the base station apparatus is connected to a mobile station apparatus, the communication method comprising:

• releasing a connection of the mobile station apparatus being wirelessly connected, and
• transmitting, to the mobile station apparatus, a connection release message instructing release of the connection, the message including cell information for causing the mobile station apparatus to start an initial access procedure for another preferable cell, wherein the cell information includes
• cell ID information and frequency information for specifying the preferable cell,
• broadcast information applied to the preferable cell detected by performing cell search, and
• preamble information used for the initial access procedure on the preferable cell, and wherein
• the broadcast information includes access restriction information,
• in a case where the access restriction information indicates an access restriction associated with Closed Subscriber Group (CSG) cell, and
• the CSG cell is configured to restrict the access of the mobile station apparatus that are not being registered.

A communication method performed by a mobile station apparatus, wherein the mobile station apparatus is connected to a base station apparatus, the communication method comprising:

• receiving, from the base station apparatus a connection release message instructing release of the connection, the message including cell information for causing the mobile station apparatus to start an initial access procedure for another preferable cell,
• wherein the cell information includes
• cell ID information and frequency information for specifying the preferable cell,
• broadcast information applied to the preferable cell detected by performing cell search, and
• preamble information used for the initial access procedure on the preferable cell;
• and
• applying the broadcast information to the preferable cell specified by the cell ID information and the frequency information in case where the preferable cell is detected by performing the cell search after release of the connection, wherein
• the broadcast information includes access restriction information,
• in a case where the access restriction information indicates an access restriction associated with Closed Subscriber Group (CSG) cell, and
• the CSG cell is configured to restrict the access of the mobile station apparatus that are not being registered.