Reconfiguration of active component carrier set in multi-carrier wireless systems
In a multi-carrier wireless system, potential problems from reconfiguring mobile station resources to accommodate changes in component-carrier configuration are mitigated by inserting a guard period each time the configuration of component carriers changes, so that transceiver reconfiguration can be carried out without interfering with ongoing transmission. A base station is configured to transmit data to a mobile station according to a first configuration of two or more component carriers, to determine that a change of configuration to a second component-carrier configuration is required, and to signal the change of configuration to the mobile station, using the first configuration of component carriers. The base station then refrains from transmitting data to the mobile station during a pre-determined guard interval of at least one transmission-time interval subsequent to the signaling of the change of configuration. After the guard interval, data is transmitted to the mobile station according to the second component-carrier configuration.
1. A wireless mobile station configured for multi-carrier operation, the wireless mobile station comprising a control circuit configured to:
receive first data from a base station according to a first configuration of two or more component carriers;
receive signaling information indicating that a change of configuration to a second component-carrier configuration is pending, the change of configuration comprising a change in the number of component carriers to be used for data transmission or a change to a set of active component carriers, with the number of active component carriers remaining the same;
selectively activate, de-activate, or reconfigure one or more transceiver components during a pre-determined guard interval of greater than one subframe, based on the signaling information; and
receive second data from the base station according to the second component-carrier configuration, after the guard interval.
2. The wireless mobile station of claim 1 , wherein the pre-determined guard interval immediately follows the subframe in which the signaling information is received.
3. The wireless mobile station of claim 1 , wherein the control circuit is further configured to delay an automatic-repeat-request process corresponding to the mobile station by a number of subframes equal to the pre-determined guard interval.
4. The wireless mobile station of claim 1 , wherein the control circuit is further configured to determine that an outgoing data transmission is scheduled for the guard interval and to defer the outgoing data transmission until after the pre-determined guard interval.
5. The wireless mobile station of claim 4 , wherein deferring the data transmission until after the pre-determined guard interval comprises performing a HARQ retransmission of the outgoing data transmission.
6. The wireless mobile station of claim 1 , wherein the change of configuration comprises an assignment for the mobile station of at least one component carrier that was previously unutilized to carry data for the mobile station.
7. The wireless mobile station of claim 1 , wherein the change of configuration comprises a discontinuation of an assignment for the mobile station of at least one component carrier that was previously utilized to carry data for the mobile station.
8. A method in a wireless mobile station configured for multi-carrier operation, the method comprising:
receiving first data from a base station according to a first configuration of two or more component carriers;
receiving signaling information indicating that a change of configuration to a second component-carrier configuration is pending, the change of configuration comprising a change in the number of component carriers to be used for data transmission or a change to a set of active component carriers, with the number of active component carriers remaining the same;
selectively activating, de-activating, or reconfiguring one or more transceiver components during a pre-determined guard interval of greater than one subframe, based on the signaling information; and
receiving second data from the base station according to the second component-carrier configuration, after the guard interval.
9. The method of claim 8 , wherein the pre-determined guard interval immediately follows the subframe in which the signaling information is received.
10. The method of claim 8 , further comprising delaying an automatic-repeat-request process corresponding to the mobile station by a number of subframes equal to the pre-determined guard interval.
11. The method of claim 8 , further comprising determining that an outgoing data transmission is scheduled for the guard interval and deferring the outgoing data transmission until after the pre-determined guard interval.
12. The method of claim 11 , wherein deferring the data transmission until after the pre-determined guard interval comprises performing a HARQ retransmission of the outgoing data transmission.
13. The method of claim 8 , wherein the change of configuration comprises an assignment for the mobile station of at least one component carrier that was previously unutilized to carry data for the mobile station.
14. The method of claim 8 , wherein the change of configuration comprises a discontinuation of an assignment for the mobile station of at least one component carrier that was previously utilized to carry data for the mobile station.