Dynamic time division duplexing
Methods, systems, and devices for wireless communication are described. A base station may allocate resources for communication with a user equipment (UE). The resources may include one or more subframes, and each subframe may include one or more shortened transmission time intervals (sTTIs). Each sTTI may be assigned a transmission direction according to a time division duplex (TDD) pattern. Based on traffic needs and/or interference from other UEs and/or base stations, the base station may determine to modify the TDD pattern used for communication. Accordingly, a base station may transmit an indicator in a control message or control region of a TTI or sTTI, to indicate to users that a transmission direction of an sTTI in the TDD pattern is being changed. Subsequently, a user may communicate with the base station according to the reconfigured TDD pattern.
1. A method for wireless communication at a user equipment (UE), comprising:
receiving, from a network device, control signaling identifying a time division duplex pattern that indicates one or more transmission directions for a short transmission time interval, the short transmission time interval being shorter than a slot, and the time division duplex pattern indicating at least one flexible symbol, wherein a transmission direction of the at least one flexible symbol is reconfigurable for uplink transmissions or downlink transmissions;
receiving, from the network device, a downlink control information message that includes a time division duplex pattern indicator comprising an indication of a reconfiguration of a transmission direction for at least a portion of the short transmission time interval to uplink or to downlink; and
communicating with the network device in the short transmission time interval based at least in part on the reconfiguration.
2. The method of claim 1 , further comprising:
receiving the downlink control information message within the slot.
3. The method of claim 2 , wherein the time division duplex pattern indicates the one or more transmission directions for the slot including the short transmission time interval, wherein receiving the downlink control information message comprises:
receiving the downlink control information message in the slot in accordance with the time division duplex pattern.
4. The method of claim 1 , wherein the reconfiguration changes the transmission direction for the at least one flexible symbol to uplink or to downlink.
5. The method of claim 1 , further comprising:
identifying a modified time division duplex pattern based at least in part on the reconfiguration, wherein the modified time division duplex pattern applies to a predetermined number of short transmission time intervals including the short transmission time interval.
6. The method of claim 1 , wherein the control signaling comprises radio resource control signaling.
7. The method of claim 1 , further comprising:
identifying that the time division duplex pattern applies to a predetermined number of transmission time intervals including the short transmission time interval.
8. A method for wireless communication at a network device, comprising:
transmitting, to a user equipment (UE), control signaling identifying a time division duplex pattern that indicates one or more transmission directions for a short transmission time interval, the short transmission time interval being shorter than a slot, and the time division duplex pattern indicating at least one flexible symbol, wherein a transmission direction of the at least one flexible symbol is reconfigurable for uplink transmissions or downlink transmissions;
transmitting, to the UE, a downlink control information message that includes a time division duplex pattern indicator comprising an indication of a reconfiguration of a transmission direction for at least a portion of the short transmission time interval to uplink or to downlink; and
communicating with the UE in the short transmission time interval based at least in part on the reconfiguration.
9. The method of claim 8 , further comprising:
transmitting the downlink control information message within the slot.
10. The method of claim 9 , wherein the time division duplex pattern indicates the one or more transmission directions for the slot including the short transmission time interval, wherein transmitting the downlink control information message comprises:
transmitting the downlink control information message in the slot in accordance with the time division duplex pattern.
11. The method of claim 8 , wherein the reconfiguration changes the transmission direction for the at least one flexible symbol to uplink or to downlink.
12. The method of claim 8 , further comprising:
identifying a modified time division duplex pattern based at least in part on the reconfiguration, wherein the modified time division duplex pattern applies to a predetermined number of short transmission time intervals including the short transmission time interval.
13. The method of claim 8 , wherein the control signaling comprises radio resource control signaling.
14. The method of claim 8 , further comprising:
identifying that the time division duplex pattern applies to a predetermined number of transmission time intervals including the short transmission time interval.
15. An apparatus for wireless communication at a user equipment (UE), comprising:
one or more processors;
one or more memories in electronic communication with the one or more processors; and
instructions stored in the one or more memories and operable, when executed by the one or more processors, to cause the apparatus to:
receive, from a network device, control signaling identifying a time division duplex pattern that indicates one or more transmission directions for a short transmission time interval, the short transmission time interval being shorter than a slot, and the time division duplex pattern indicating at least one flexible symbol, wherein a transmission direction of the at least one flexible symbol is reconfigurable for uplink transmissions or downlink transmissions;
receive, from the network device, a downlink control information message that includes a time division duplex pattern indicator comprising an indication of a reconfiguration of a transmission direction for at least a portion of the short transmission time interval to uplink or to downlink; and
communicate with the network device in the short transmission time interval based at least in part on the reconfiguration.
16. The apparatus of claim 15 , wherein the short transmission time interval is included within the slot, wherein the instructions are further executable by the processor to cause the apparatus to:
receive the downlink control information message within the slot.
17. The apparatus of claim 16 , wherein the time division duplex pattern indicates the one or more transmission directions for the slot including the short transmission time interval, wherein the instructions to receive the downlink control information message are further executable by the processor to cause the apparatus to:
receive the downlink control information message in the slot in accordance with the time division duplex pattern.
18. The apparatus of claim 15 , wherein the reconfiguration changes the transmission direction for the at least one flexible symbol to uplink or to downlink.
19. The apparatus of claim 15 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify a modified time division duplex pattern based at least in part on the reconfiguration, wherein the modified time division duplex pattern applies to a predetermined number of short transmission time intervals including the short transmission time interval.
20. The apparatus of claim 15 , wherein the control signaling comprises radio resource control signaling.
21. An apparatus for wireless communication at a network device, comprising:
one or more processors;
one or more memories in electronic communication with the one or more processors; and
instructions stored in the one or more memories and operable, when executed by the one or more processors, to cause the apparatus to:
transmit, to a user equipment (UE), control signaling identifying a time division duplex pattern that indicates one or more transmission directions for a short transmission time interval, the short transmission time interval being shorter than a slot, and the time division duplex pattern indicating at least one flexible symbol, wherein a transmission direction of the at least one flexible symbol is reconfigurable for uplink transmissions or downlink transmissions;
transmit, to the UE, a downlink control information message that includes a time division duplex pattern indicator comprising an indication of a reconfiguration of a transmission direction for at least a portion of the short transmission time interval to uplink or to downlink; and
communicate with the UE in the short transmission time interval based at least in part on the reconfiguration.
22. The apparatus of claim 21 , herein the instructions are further executable by the processor to cause the apparatus to:
transmit the downlink control information message within the slot.
23. The apparatus of claim 22 , wherein the time division duplex pattern indicates the one or more transmission directions for the slot including the short transmission time interval, wherein the instructions to transmit the downlink control information message are further executable by the processor to cause the apparatus to:
transmit the downlink control information message in accordance with the time division duplex pattern.
24. The apparatus of claim 21 , wherein the reconfiguration changes the transmission direction for the at least one flexible symbol to uplink or to downlink.
25. The apparatus of claim 21 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify a modified time division duplex pattern based at least in part on the reconfiguration, wherein the modified time division duplex pattern applies to a predetermined number of short transmission time intervals including the short transmission time interval.
26. The apparatus of claim 21 , wherein the control signaling comprises radio resource control signaling.