System and method for carrier activation

1. A method for receiving data using a user agent (UA) configured to communicate with a wireless communications network using a first and second communication carrier, comprising:

receiving, from a base station, resource information on a physical downlink control channel (PDCCH) at a first time interval using the first communication carrier, the PDCCH on the first communication carrier is designated to allocate physical downlink shared channel (PDSCH) resources for both the first communication carrier and the second communication carrier, the resource information allocating a PDSCH resource on at least one of the first communication carrier or the second communication carrier and indicating to the UA a carrier switch is required via an explicit designated carrier switch indication or an implicit carrier switch indication; wherein the explicit carrier switch indication is defined as:

receiving at least one of a carrier switch indication field in the resource information to a value indicative of a carrier switch, the carrier switch designating that the second communication carrier allocates PDSCH resources for both the first communication carrier and the second communication carrier;

and wherein the implicit carrier switch indication is defined as:

receiving resource information in the first time interval that allocates resources on the second communication carrier; and receiving resource information in the first time interval that does not allocate resources on the first communication carrier.

2. The method of claim 1 , further comprising, when the resource information indicates a carrier switch is required:

ceasing signal reception on the first communication carrier; and

receiving a signal on the second communication carrier.

3. The method of claim 2 , including sending an acknowledgement after reception of the resource information indicating a carrier switch is required.

4. The method of claim 3 , wherein the acknowledgement is transmitted over a channel corresponding to a resource index used for transmitting the resource information.

5. The method of claim 2 , wherein the second communication carrier is a designated carrier of the UA after reception of the resource information at a first time interval.

6. The method of claim 1 , including, when the resource information indicates a carrier switch is required:

maintaining signal reception on the first communication carrier; and

receiving a signal on the second communication carrier.

7. The method of claim 6 , including sending an acknowledgement after reception of the resource information indicating a carrier switch is required.

8. The method of claim 7 , wherein the acknowledgement is mapped to a channel corresponding to an index of the resource information.

9. The method of claim 8 , wherein the second communication carrier is a designated carrier of the UA after reception of the resource information at a first time interval.

10. The method of claim 1 , wherein the first communication carrier is a designated carrier of the UA.

11. The method of claim 1 , wherein the resource information allocates resources on the second communication carrier and does not allocate resources on the first communication carrier.

12. A user agent (UA) configured to communicate with a wireless communications network using a first and second communication carrier, comprising:

a processor, the processor being configured to:

receive, from a base station, resource information on a physical downlink control channel (PDCCH) at a first time interval using the first communication carrier, the PDCCH on the first communication carrier is designated to allocate physical downlink shared channel (PDSCH) resources for both the first communication carrier and the second communication carrier, the resource information allocating a PDSCH resource on at least one of the first communication carrier or the second communication carrier and indicating to the UA a carrier switch is required via an explicit designated carrier switch indication or an implicit carrier switch indication; wherein the explicit carrier switch indication is defined as:

receiving at least one of a carrier switch indication field in the resource information to a value indicative of a carrier switch, the carrier switch designating that the second communication carrier allocates PDSCH resources for both the first communication carrier and the second communication carrier;

and wherein the implicit carrier switch indication is defined as:

receiving resource information in the first time interval that allocates resources on the second communication carrier; and receiving resource information in the first time interval that does not allocate resources on the first communication carrier.

13. The UA of claim 12 , wherein, when the resource information indicates a carrier switch is required, the processor is configured to:

cease signal reception on the first communication carrier; and

receive a signal on the second communication carrier.

14. The UA of claim 13 , wherein the processor is configured to send an acknowledgement after reception of the resource information indicating a carrier switch is required.

15. The UA of claim 13 , wherein the second communication carrier is a designated carrier of the UA after reception of the resource information at a first time interval.

16. The UA of claim 12 , wherein, when the resource information indicates a carrier switch is required, the processor is configured to:

maintain signal reception on the first communication carrier; and

receive a signal on the second communication carrier.

17. The UA of claim 16 , wherein the processor is configured to send an acknowledgement after reception of the resource information indicating a carrier switch is required.

18. The UA of claim 12 , wherein, when the resource information indicates a carrier switch is not required, the processor is configured to:

maintain signal reception on the first communication carrier; and

receive a signal on the second communication carrier.

19. A wireless communications system for allocating resources on at least one of a first and second communication carrier of the wireless communications system to a user agent (UA), comprising:

a base station, the base station being configured to:

transmit, to the UA, resource information on a physical downlink control channel (PDCCH) at a first time interval using the first communication carrier, the PDCCH on the first communication carrier is designated to allocate physical downlink shared channel (PDSCH) resources for both the first communication carrier and the second communication carrier, the resource information allocating a PDSCH resource on at least one of the first communication carrier or the second communication carrier and indicating to the UA a carrier switch is required via an explicit designated carrier switch indication or an implicit carrier switch indication; wherein the explicit carrier switch indication is defined as:

transmitting at least one of a carrier switch indication field in the resource information to a value indicative of a carrier switch, the carrier switch designating that the second communication carrier allocates PDSCH resources for both the first communication carrier and the second communication carrier;

and wherein the implicit carrier switch indication is defined as:

transmitting resource information in the first time interval that allocates resources on the second communication carrier; and transmitting resource information in the first time interval that does not allocate resources on the first communication carrier.

20. The wireless communications system of claim 19 , wherein, when the resource information indicates a carrier switch is required, the base station is configured to:

cease signal transmission on the first communication carrier to the UA; and

transmit a signal on the second communication carrier to the UA.

21. The wireless communications system of claim 20 , wherein the base station is configured to receive an acknowledgement after transmission of the resource information indicating a carrier switch is required.

22. The wireless communications system of claim 20 , wherein the second communication carrier is a designated carrier of the UA after transmission of the resource information at a first time interval.

23. The wireless communications system of claim 19 , wherein, when the resource information indicates a carrier switch is required, the base station is configured to:

maintain signal transmission on the first communication carrier to the UA; and

transmit a signal on the second communication carrier to the UA.

24. The wireless communications system of claim 23 , wherein the base station is configured to receive an acknowledgement after transmission of the resource information indicating a carrier switch is required.

25. The wireless communications system of claim 19 , wherein, when the resource information indicates a carrier switch is not required, the base station is configured to:

maintain signal transmission on the first communication carrier to the UA; and

transmit a signal on the second communication carrier to the UA.

26. A method for allocating resources on at least one of a first and second communication carrier of the wireless communications system to a user agent (UA), comprising:

transmitting, to the UA, by a base station, resource information on a physical downlink control channel (PDCCH) at a first time interval using the first communication carrier, the PDCCH on the first communication carrier is designated to allocate physical downlink shared channel (PDSCH) resources for both the first communication carrier and the second communication carrier, the resource information allocating a PDSCH resource on at least one of the first communication carrier or the second communication carrier and indicating to the UA a carrier switch is required via an explicit designated carrier switch indication or an implicit carrier switch indication; wherein the explicit carrier switch indication is defined as:

transmitting at least one of a carrier switch indication field in the resource information to a value indicative of a carrier switch, the carrier switch designating that the second communication carrier to allocates PDSCH resources for both the first communication carrier and the second communication carrier;

and wherein the implicit carrier switch indication is defined as:

transmitting resource information in the first time interval that allocates resources on the second communication carrier; and transmitting resource information in the first time interval that does not allocate resources on the first communication carrier.

27. The method of claim 26 , when the resource information indicates a carrier switch is required, the method further comprising:

ceasing signal transmission on the first communication carrier to the UA; and

transmitting a signal on the second communication carrier to the UA.

28. The method of claim 27 , wherein the base station is configured to receive an acknowledgement after transmission of the resource information indicating a carrier switch is required.

29. The method of claim 27 , wherein the second communication carrier is a designated carrier of the UA after transmission of the resource information at a first time interval.

30. The method of claim 26 , when the resource information indicates a carrier switch is required, the method further comprising:

maintaining signal transmission on the first communication carrier to the UA; and

transmitting a signal on the second communication carrier to the UA.

31. The method of claim 30 , wherein the base station is configured to receive an acknowledgement after transmission of the resource information indicating a carrier switch is required.

32. The method of claim 26 , when the resource information indicates a carrier switch is not required, the method further comprising:

maintaining signal transmission on the first communication carrier to the UA; and

transmitting a signal on the second communication carrier to the UA.