Data transmission in carrier aggregation with different carrier configurations
Techniques are provided for aggregating carriers with different carrier configurations. The carriers may include both time division duplex (TDD) and frequency division duplex (FDD) carriers which may be configured such that control information for both carrier types is conveyed by the TDD carrier. In one aspect, an association between a set of subframes, including both TDD and FDD subframes, is determined. The association may operate to distribute control information for the FDD carrier over uplink subframes of the TDD carrier to achieve a load balancing. Alternatively, the association may operate to minimize a hybrid automatic repeat request (HARQ) feedback delay. The TDD carrier may provide resource grants for the aggregated carriers and the association may be used to identify subframes from both carriers which may be scheduled in a given DL subframe.
1. A method of wireless communication by a mobile device configured for carrier aggregation (CA) of at least a time division duplexed (TDD) first component carrier and a frequency division duplexed (FDD) second component carrier, comprising:
determining an association between a set of downlink (DL) subframes including TDD subframes and FDD subframes of the respective first and second component carriers and an uplink (UL) subframe of the first component carrier based on an uplink-downlink configuration of the first component carrier, wherein an availability of uplink and downlink subframes for communicating on the first component carrier is determined according to the uplink-downlink configuration of the first component carrier and is different than an availability of uplink and downlink subframes for communicating on the second component carrier;
generating control information associated with transmissions on the set of DL subframes; and
sending the control information on the UL subframe of the first component carrier based on the association, wherein each DL subframe of the second component carrier is associated with a corresponding UL subframe of the first component carrier.
2. The method of claim 1 , wherein the association comprises a distribution of the control information associated with one or more FDD subframes such that control information for not more than a predetermined number of FDD subframe(s) is associated with the UL subframe.
3. The method of claim 2 , wherein the predetermined number of FDD subframe(s) comprises one DL subframe.
4. The method of claim 1 , wherein the UL subframe comprises a closest succeeding UL subframe for providing hybrid automatic repeat request (HARQ) feedback for the transmissions on the set of DL subframes subject to a minimum HARQ processing time.
5. The method of claim 1 , wherein the association specifies a distribution of HARQ feedback for the FDD subframes in relation to the uplink-downlink configuration of the first component carrier.
6. The method of claim 1 , wherein the control information comprises HARQ feedback bits, and sending the control information comprises bundling the HARQ feedback bits for two or more subframes in the set of DL subframes.
7. The method of claim 1 , wherein the association comprises a mapping of HARQ feedback to bits of an UL control channel format.
8. A mobile device configured for carrier aggregation (CA) of at least a time division duplexed (TDD) first component carrier and a frequency division duplexed (FDD) second component carrier, the mobile device comprising:
means for determining an association between a set of downlink (DL) subframes including TDD subframes and FDD subframes of the respective first and second component carriers and an uplink (UL) subframe of the first component carrier based on an uplink-downlink configuration of the first component carrier, wherein an availability of uplink and downlink subframes for communicating on the first component carrier is determined according to the uplink-downlink configuration of the first component carrier and is different than an availability of uplink and downlink subframes for communicating on the second component carrier;
means for generating control information associated with transmissions on the set of DL subframes; and
means for sending the control information on the UL subframe of the first component carrier based on the association, wherein each DL subframe of the second component carrier is associated with a corresponding UL subframe of the first component carrier.
9. The mobile device of claim 8 , wherein the association comprises a distribution of the control information associated with one or more FDD subframes such that control information for not more than a predetermined number of FDD subframe(s) is associated with the UL subframe.
10. The mobile device of claim 9 , wherein the predetermined number of FDD subframe(s) comprises one DL subframe.
11. The mobile device of claim 8 , wherein the UL subframe comprises a closest succeeding UL subframe for providing hybrid automatic repeat request (HARQ) feedback for the transmissions on the set of DL subframes subject to a minimum HARQ processing time.
12. The mobile device of claim 8 , wherein the association specifies a distribution of HARQ feedback for the FDD subframes in relation to the uplink-downlink configuration of the first component carrier.
13. The mobile device of claim 8 , wherein the control information comprises HARQ feedback bits, and the means for sending the control information is further configured for bundling the HARQ feedback bits for two or more subframes in the set of DL subframes.
14. The mobile device of claim 8 , wherein the association comprises a mapping of HARQ feedback to bits of an UL control channel format.
15. A mobile device configured for carrier aggregation (CA) of at least a time division duplexed (TDD) first component carrier and a frequency division duplexed (FDD) second component carrier, the mobile device comprising:
at least one processor configured to:
determine an association between a set of downlink (DL) subframes including TDD subframes and FDD subframes of the respective first and second component carriers and an uplink (UL) subframe of the first component carrier based on an uplink-downlink configuration of the first component carrier, wherein an availability of uplink and downlink subframes for communicating on the first component carrier is determined according to the uplink-downlink configuration of the first component carrier and is different than an availability of uplink and downlink subframes for communicating on the second component carrier, and
generate control information associated with transmissions on the set of DL subframes;
a transceiver configured to send the control information on the UL subframe of the first component carrier based on the association, wherein each DL subframe of the second component carrier is associated with a corresponding UL subframe of the first component carrier; and
a memory coupled to the at least one processor for storing data.
16. The mobile device of claim 15 , wherein the association comprises a distribution of the control information associated with one or more FDD subframes such that control information for not more than a predetermined number of FDD subframe(s) is associated with the UL subframe.
17. The mobile device of claim 16 , wherein the predetermined number of FDD subframe(s) comprises one DL subframe.
18. The mobile device of claim 15 , wherein the UL subframe comprises a closest succeeding UL subframe for providing hybrid automatic repeat request (HARQ) feedback for the transmissions on the set of DL subframes subject to a minimum HARQ processing time.
19. The mobile device of claim 15 , wherein the control information comprises HARQ feedback bits, and the transceiver is further configured to send the control information comprises bundling the HARQ feedback bits for two or more subframes in the set of DL subframes.
20. The mobile device of claim 15 , wherein the association comprises a mapping of HARQ feedback to bits of an UL control channel format.
21. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to:
determine an association between a set of downlink (DL) subframes including TDD subframes of a first component carrier and FDD subframes of a second component carrier and an uplink (UL) subframe of the first component carrier based on an uplink-downlink configuration of the first component carrier, wherein an availability of uplink and downlink subframes for communicating on the first component carrier is determined according to the uplink-downlink configuration of the first component carrier and is different than an availability of uplink and downlink subframes for communicating on the second component carrier;
generate control information associated with transmissions on the set of DL subframes; and
send the control information on the UL subframe of the first component carrier based on the association, wherein each DL subframe of the second component carrier is associated with a corresponding UL subframe of the first component carrier.
22. A method of wireless communication by an access node supporting carrier aggregation (CA) of at least a time division duplexed (TDD) first component carrier and a frequency division duplexed (FDD) second component carrier for a mobile device, comprising:
receiving, from the mobile device on an uplink (UL) subframe, control information associated with transmissions on a set of downlink (DL) subframes including TDD subframes of a first component carrier and FDD subframes of a second component carrier, wherein an availability of uplink and downlink subframes for communicating on the first component carrier is determined according to the uplink-downlink configuration of the first component carrier and is different than an availability of uplink and downlink subframes for communicating on the second component carrier;
determining an association between the set of DL subframes and the UL subframe based on an uplink-downlink configuration of the first component carrier; and
decoding, by the access node, the control information in accordance with the association, wherein each DL subframe of the second component carrier is associated with an UL subframe of the first component carrier.
23. The method of claim 22 , wherein the association comprises a distribution of control information associated with subframes of the second component carrier such that control information for not more than a predetermined number of FDD subframe(s) is associated with the DL subframe.
24. The method of claim 22 , wherein the UL subframe comprises a closest succeeding UL subframe for providing hybrid automatic repeat request (HARQ) feedback for the transmissions on the set of DL subframes subject to a minimum HARQ processing time.
25. The method of claim 22 , wherein the control information comprises bundled HARQ feedback, and decoding the control information comprises decoding the HARQ feedback for determining a status of the associated one or more FDD subframes.
26. The method of claim 22 , wherein the association comprises a mapping of HARQ feedback to bits of an UL control channel format.
27. An access node configured for carrier aggregation (CA) of at least a time division duplexed (TDD) first component carrier and a frequency division duplexed (FDD) second component carrier, comprising:
means for receiving, from a mobile device on an uplink (UL) subframe, control information associated with transmissions on a set of downlink (DL) subframes including TDD subframes of a first component carrier and FDD subframes of a second component carrier, wherein an availability of uplink and downlink subframes for communicating on the first component carrier is determined according to the uplink-downlink configuration of the first component carrier and is different than an availability of uplink and downlink subframes for communicating on the second component carrier;
means for determining an association between the set of DL subframes and the UL subframe based on an uplink-downlink configuration of the first component carrier; and
means for decoding, by the access node, the control information in accordance with the association, wherein each DL subframe of the second component carrier is associated with an UL subframe of the first component carrier.
28. The access node of claim 27 , wherein the association comprises a distribution of control information associated with subframes of the second component carrier such that control information for not more than a predetermined number of FDD subframe(s) is associated with the DL subframe.
29. The access node of claim 27 , wherein the UL subframe comprises a closest succeeding UL subframe for providing hybrid automatic repeat request (HARD) feedback for the transmissions on the set of DL subframes subject to a minimum HARQ processing time.
30. The access node of claim 27 , wherein the control information comprises bundled HARQ feedback and decoding the control information comprises decoding the HARQ feedback for determining a status of the associated one or more FDD subframes.
31. The access node of claim 27 , wherein the association comprises a mapping of HARQ feedback to bits of an UL control channel format.
32. An access node configured for carrier aggregation (CA) of at least a time division duplexed (TDD) first component carrier and a frequency division duplexed (FDD) second component carrier for a mobile device, comprising:
a transceiver configured to receive, from the mobile device on an uplink (UL) subframe, control information associated with transmissions on a set of downlink (DL) subframes including TDD subframes of a first component carrier and FDD subframes of a second component carrier, wherein an availability of uplink and downlink subframes for communicating on the first component carrier is determined according to the uplink-downlink configuration of the first component carrier and is different than an availability of uplink and downlink subframes for communicating on the second component carrier;
at least one processor configured to:
determine an association between the set of DL subframes and the UL subframe based on an uplink-downlink configuration of the first component carrier, and
decode, by the access node, the control information in accordance with the association, wherein each DL subframe of the second component carrier is associated with an UL subframe of the first component carrier; and
a memory coupled to the at least one processor for storing data.
33. The access node of claim 32 , wherein the association comprises a distribution of control information associated with subframes of the second component carrier such that control information for not more than a predetermined number of FDD subframe(s) is associated with the DL subframe.
34. The access node of claim 32 , wherein the UL subframe comprises a closest succeeding UL subframe for providing hybrid automatic repeat request (HARQ) feedback for the transmissions on the set of DL subframes subject to a minimum HARQ processing time.
35. The access node of claim 32 , wherein the control information comprises bundled HARQ feedback and decoding the control information comprises decoding the HARQ feedback for determining a status of the associated one or more FDD subframes.
36. The access node of claim 32 , wherein the association comprises a mapping of HARQ feedback to bits of an UL control channel format.
37. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to:
receive, from a mobile device on an uplink (UL) subframe, control information associated with transmissions on a set of downlink (DL) subframes including TDD subframes of a first component carrier and FDD subframes of a second component carrier, wherein an availability of uplink and downlink subframes for communicating on the first component carrier is determined according to the uplink-downlink configuration of the first component carrier and is different than an availability of uplink and downlink subframes for communicating on the second component carrier;
determine an association between the set of DL subframes and the UL subframe based on an uplink-downlink configuration of the first component carrier; and
the control information in accordance with the association, wherein each DL subframe of the second component carrier is associated with an UL subframe of the first component carrier.