System and method for supporting inter-band carrier aggregation with different UL/DL TDD configurations
In some implementations, a method of wireless communications between a wireless communications network and wireless user equipment includes receiving, using a primary Time Division Duplex (TDD) configuration, data on a primary component carrier in a first frequency band. Using a secondary TDD configuration, data on a secondary component carrier is received in a second frequency band different from the first frequency band. A Hybrid Automatic Repeat Request (HARQ) for data received on the secondary component carrier is transmitted using a supplemental TDD configuration. A transmission or retransmission on the secondary component carrier uses a supplemental TDD configuration as well. The supplemental TDD configuration is different from the secondary TDD configuration. Furthermore, an uplink supplemental configuration may be different from a downlink supplemental configuration.
1. A method of wireless communications between a wireless communications network and wireless user equipment, comprising:
receiving, using a primary time division duplex (TDD) configuration, data on a primary component carrier in a first frequency band;
receiving, using a secondary TDD configuration, data on a secondary component carrier in a secondary frequency band different from the first frequency band; and
transmitting a Hybrid Automatic Repeat Request (HARQ) for data received on the second component carrier using a supplemental TDD configuration, wherein the supplemental TDD configuration is different from the secondary TDD configuration.
2. The method of claim 1 , wherein the primary TDD configuration comprises a primary downlink TDD configuration including downlink subframes, the secondary TDD configuration comprises a secondary downlink TDD configuration including downlink subframes, and the supplemental TDD configuration specifies a set of downlink subframes including downlink subframes specified in the primary TDD configuration and the secondary TDD configuration.
3. The method of claim 1 , further comprising transmitting an uplink HARQ for uplink data received on the secondary component carrier, using a supplemental uplink TDD configuration, wherein the supplemental uplink TDD configuration specifies a set of uplink subframes including uplink subframes in the primary TDD configuration and the secondary TDD configuration.
4. The method of claim 3 , further comprising transmitting, using the supplemental uplink TDD configuration, an uplink grant granting resources for uplink data transmissions on the secondary component carrier.
5. The method of claim 4 , further comprising retransmitting an uplink data packet on the secondary component carrier at a modified uplink retransmission subframe different from an uplink retransmission subframe specified by the supplemental TDD configuration.
6. The method of claim 5 , wherein the modified uplink retransmission subframe is a subframe preceding the uplink retransmission subframe.
7. The method of claim 5 , wherein the modified uplink retransmission subframe is a next available uplink subframe not previously scheduled after the uplink retransmission subframe.
8. The method of claim 1 , wherein the supplemental TDD configuration comprises a supplemental downlink TDD configuration or a supplemental uplink TDD configuration.
9. The method of claim 1 , further comprising receiving data on tertiary component carrier using a third TDD configuration in a third frequency band different from the first frequency band and the second frequency band, wherein the supplemental TDD configuration comprises an aggregations of the primary TDD configuration and third TDD configuration.
10. The method of claim 1 , further comprising in response to not receiving a DL PDCCH to schedule grants, executing at least one of Cross Transmission Time Interval (TTI) scheduling, bundle scheduling, or temporarily disable cross-carrier scheduling.
11. A method of wireless communications between a wireless communications network and wireless user equipment, comprising:
determining a first transmission direction in a same subframe in a primary component carrier using a primary Time Division Duplex (TDD) configuration, wherein the primary component carrier is in a first frequency band;
determining a second transmission direction at the same subframe in a secondary component carrier using a secondary TDD configuration, wherein the second component carrier is in a second frequency band different from the first frequency band;
selecting a muted component carrier in the secondary component carrier; and
muting transmission and reception on the muted component carrier at the subframe.
12. The method of claim 11 , further comprising:
transmitting an uplink Hybrid Automatic Repeat Request (HARQ) for uplink data transmitted on the secondary component carrier at transmission times defined in the primary TDD configuration; and
receiving a downlink HARQ for downlink data received on the secondary component carrier at transmission times defined in the primary TDD configuration.
13. The method of claim 12 , further comprising transmitting an uplink grant granting resources for uplink data transmissions on the secondary component carrier at transmission times defined in the primary TDD configuration.
14. The method of claim 12 , further comprising retransmitting an uplink data packet on the secondary component carrier at a modified uplink retransmission subframe different from an uplink retransmission subframe specified by supplemental TDD configuration.
15. The method of claim 14 , wherein the modified uplink transmission or retransmission subframe is one subframe prior to an uplink transmission subframe specified by the primary TDD configuration.
16. The method of claim 14 , wherein the modified uplink transmission or retransmission subframe is at a next available uplink subframe after an uplink transmission subframe specified by the primary TDD configuration.
17. The method of claim 11 , wherein selecting the muted component carrier is periodically executed, and the selection is based, at least in part, on an evaluation of at least one interference condition or traffic condition.
18. A method of wireless communication between a wireless communications network and wireless user equipment, comprising:
receiving, using a primary time division duplex (TDD) configuration, uplink data on a primary component carrier in a first frequency band;
receiving, using a secondary TDD configuration, uplink data on a secondary component carrier in a secondary frequency band different from the first frequency band; and
transmitting a grant granting resources for uplink data transmissions on the secondary component carrier using a supplemental TDD configuration, wherein the supplemental TDD configuration is different from the secondary TDD configuration.
19. The method of claim 18 , further comprising granting resources for uplink data transmissions on the secondary component carrier at a modified uplink transmission subframe different from an uplink transmission subframe specified by the supplemental TDD configuration.
20. The method of claim 18 , further comprising retransmitting an uplink data packet on the secondary component carrier at a modified uplink retransmission subframe different from an uplink retransmission subframe specified by the supplemental TDD configuration.