Communication system for supporting carrier aggregation and method and apparatus for updating system information thereof

An apparatus of providing system information in a communication system supporting carrier aggregation, comprising:

• an information generating device, configured to generate, when there is a change in system information of the communication system, first information which comprises information indicating that there is a change in system information;
• a cell determining device, configured to determine a first cell of a user equipment involved in the change in system information, wherein the first cell is one of cells to which the user equipment is connected and corresponds to a component carrier which is being used by the user equipment and is kept in connection with a base station of the communication system;
• and
• a transmitting device, configured to transmit the first information to the user equipment via the first cell,
• wherein the change in system information comprises adding a component carrier for the user equipment, the first information further comprises system information associated with the component carrier to be added, and
• wherein the information generating device is further configured to encapsulate the first information in a second dedicated signaling;
• and the transmitting device is further configured to transmit the second dedicated signaling to the user equipment via the first cell,
• the system information comprises configuration information on transmission bandwidth and information indicating frequency bands associated with the component carrier to be added, and
• when the component carrier to be added is for downlink transmission, the system information further comprises configuration information for downlink channels of the component carrier to be added.

A method of receiving system information in a communication system supporting carrier aggregation, comprising:

• receiving first information which comprises information indicating that there is a change in system information of the communication system via a first cell corresponding to a component carrier which is being used by a user equipment of the communication system and is kept in connection with a base station of the communication system;
• and
• parsing the first information, to obtain the information indicating that there is a change in system information,
• wherein the change in system information comprises adding a component carrier for the user equipment, the first information further comprises system information associated with the component carrier to be added, and
• wherein receiving the first information via the first cell comprises:
• receiving a second dedicated signaling in which the first information is encapsulated via the first cell, and
• parsing the first information comprises:
• parsing the second dedicated signaling, to obtain the system information associated with the component carrier to be added from the first information, and
• wherein the method further comprises:
• configuring the component carrier to be added based on the system information associated with the component carrier to be added,
• wherein the system information comprises configuration information on transmission bandwidth and information indicating frequency bands associated with the component carrier to be added, and
• when the component carrier to be added is for downlink transmission, the system information further comprises configuration information for downlink channels of the component carrier to be added.

An apparatus of receiving system information in a communication system supporting carrier aggregation, comprising:

• a receiving device, configured to receive first information which comprises information indicating that there is a change in system information of the communication system via a first cell corresponding to a component carrier which is being used by the apparatus and is kept in connection with a base station of the communication system;
• and
• a control device, configured to parse the first information, to obtain the information indicating that there is a change in system information,
• wherein the change in system information comprises adding a component carrier for the apparatus, the first information further comprises system information associated with the component carrier to be added, and
• wherein the receiving device is further configured to receive a second dedicated signaling in which the first information is encapsulated via the first cell, and
• the control device is further configured to parse the second dedicated signaling to obtain the system information associated with the component carrier to be added from the first information, and configure the component carrier to be added according to the system information associated with the component carrier to be added,
• wherein the system information comprises configuration information on transmission bandwidth and information indicating frequency bands associated with the component carrier to be added, and
• when the component carrier to be added is for downlink transmission, the system information further comprises configuration information for downlink channels of the component carrier to be added.