Pucch resource allocation for carrier aggregation in lte-advanced

A base station comprising:

• a transmitter to transmit user data on one or more downlink component carriers to a first user terminal and a second user terminal;
• and
• a controller to schedule downlink transmissions to the first user terminal and the second user terminal, the controller configured to:
• schedule downlink transmissions to the first user terminal on a single downlink component carrier associated with a primary cell and schedule downlink transmissions to the second user terminal on multiple downlink component carriers or on a downlink component carrier associated with a non-primary cell;
• receive, on a first set of radio resources, control information associated with the downlink transmissions to the first user terminal, wherein the first set of radio resources is reserved for user terminals scheduled to receive downlink transmissions on a single downlink component carrier associated with the primary cell;
• and
• receive, on a second set of radio resources, control information associated with the downlink transmissions to the second user terminal, wherein the second set of radio resources is reserved for user terminals scheduled to receive downlink transmissions on multiple downlink component carriers or on a downlink component carrier associated with a non-primary cell, the first and second sets of radio resources being on a same uplink component carrier associated with the primary cell.

A method implemented by a user terminal of transmitting control information in a mobile communication network, the method comprising:

• receiving an assignment of radio resources for downlink transmissions from a base station;
• transmitting, on a first set of radio resources, control information associated with the downlink transmissions responsive to being assigned radio resources on a single downlink component carrier associated with the primary cell for the downlink transmission, wherein the first set of radio resources is reserved for user terminals scheduled to receive downlink transmissions on a single downlink component carrier associated with the primary cell;
• and
• transmitting, on a second set of radio resources, control information associated with the downlink transmissions responsive to being assigned radio resources on multiple downlink component carriers or on a downlink component carrier associated with a non-primary cell for the downlink transmission, wherein the second set of radio resources is reserved for user terminals scheduled to receive downlink transmissions on multiple downlink component carriers or on a downlink component carrier associated with a non-primary cell, the first and second sets of radio resources being on a same uplink component carrier associated with the primary cell.

A user terminal for mobile communications, the user terminal comprising:

• a receiver to receive downlink transmissions from a base station;
• a transmitter to transmit control information associated with the downlink transmission to a base station;
• and
• a controller to select radio resources for transmission of control information associated with the downlink transmissions, the controller configured to:
• select a first set of radio resources responsive to being assigned radio resources on a single downlink component carrier associated with the primary cell for the downlink transmission, wherein the first set of radio resources is reserved for user terminals scheduled to receive downlink transmissions on a single downlink component carrier associated with the primary cell;
• and
• select a second set of radio resources responsive to being assigned radio resources on multiple downlink component carriers or on a downlink component carrier associated with a non-primary cell for the downlink transmissions, wherein the second set of radio resources is reserved for user terminals scheduled to receive downlink transmissions on multiple downlink component carriers or on a downlink component carrier associated with a non-primary cell, the first and second sets of radio resources being on a same uplink component carrier associated with the primary cell.