Radio access technology with non-continuous and periodic PUSCH transmission
A user equipment (UE) and base station may implement improved communication methods which enable a UE that is peak current limited to perform UL transmissions which are consistent with the UL timeline. A UE that is peak current limited may utilize a new form of distributed TTI (transmit time interval) bundling for improved uplink communication performance. In performing “distributed” TTI bundling, the UE may transmit a plurality of redundancy versions of first information to the base station, wherein the plurality of redundancy versions are transmitted in non-consecutive sub-frames with a periodicity of X ms. After the plurality of redundancy versions of first information are transmitted to the base station, the base station may provide a single acknowledge/negative acknowledge (ACK/NACK) to the UE. A method for dynamically generating and using a bundle size for TTI bundling is also disclosed.
1. A user equipment device (UE), comprising:
at least one antenna;
at least one radio, wherein the at least one radio is configured to perform cellular communication using at least one radio access technology (RAT);
one or more processors coupled to the at least one radio, wherein the one or more processors and the at least one radio are configured to perform voice and/or data communications;
wherein the one or more processors and the at least one radio are configured to:
indicate, via a radio resource control (RRC) message, that the UE has a transmission limitation, wherein the transmission limitation causes the UE to not transmit continuously in uplink (UL);
receive an UL grant on a physical downlink control channel (PDCCH) for transmission on physical uplink shared channel (PUSCH) resources assigned to the UE;
transmit data according to the UL grant on a first time portion of the PUSCH resources assigned to the UE; and
do not transmit during a specified time portion of the PUSCH resources assigned to the UE in accordance with the indicated transmission limitation.
2. The UE of claim 1 ,
wherein the UL grant comprises information specifying periodic UL grants.
3. The UE of claim 2 ,
wherein a periodicity of the UL grants is based, at least in part, on a bundle size specifying a number of a plurality of redundancy versions of the data to be transmitted.
4. The UE of claim 1 ,
wherein the specified time portion corresponds to a duty cycle of the UE, wherein the duty cycle is based on a number of UL transmissions the UE will remain in a low power state and a round trip time of a hybrid automatic repeat request (HARQ).
5. The UE of claim 4 ,
wherein the low power state is a discontinuous transmission (DTX) cycle.
6. The UE of claim 1 ,
wherein the data is transmitted in accordance with a sub-frame (TTI) bundle size.
7. The UE of claim 6 ,
wherein the sub-frame bundle size is dynamically determined at least once during the voice and/or data communications.
8. The UE of claim 7 ,
wherein the bundle size specifies a number of a plurality of redundancy versions of first information transmitted.
9. The UE of claim 1 ,
wherein the one or more processors and the at least one radio are further configured to:
receive, in accordance with a hybrid automatic repeat request (HARQ) timeline, an acknowledgement/negative acknowledgement (ACK/NACK) of the transmission of data, wherein the ACK/NACK is a first NACK received X sub-frames after transmission of the data, and wherein the data comprises a first redundancy version of the data
receive, 3X sub-frames after transmission of the data, a second NACK of the transmission of data; and
transmit, X sub-frames after receipt of the second NACK, a second redundancy version of the data.
10. The UE of claim 1 ,
wherein the one or more processors and the at least one radio are further configured to:
receive a first negative acknowledge (NACK) from a base station after transmission of the data, wherein the UE does not perform a retransmission of the data in response to receiving the first NACK.
11. An apparatus, comprising:
a memory; and
a processing element in communication with the memory, wherein the processing element is configured to:
generate instructions to indicate to a base station and via a radio resource control (RRC) message, that the apparatus has a transmission limitation, wherein the transmission limitation causes the apparatus to not transmit continuously in uplink (UL);
receive, from the base station, an UL grant on a physical downlink control channel (PDCCH) for transmission on physical uplink shared channel (PUSCH) resources assigned to the apparatus;
generate instructions to transmit data according to the UL grant on a time portion of the PUSCH resources assigned to the apparatus; and
generate instructions to not transmit during a specified time portion of the PUSCH resources assigned to the apparatus in accordance with the indicated transmission limitation.
12. The apparatus of claim 11 ,
wherein the UL grant received from the base station comprises information specifying periodic UL grants; and
wherein a periodicity of the UL grants is based, at least in part, on a bundle size specifying a number of a plurality of redundancy versions of the data to be transmitted to the base station.
13. The apparatus of claim 11 ,
wherein the specified time portion corresponds to a transmission duty cycle of the apparatus, wherein the duty cycle is based on a number of UL transmissions the apparatus will remain in a low power state and a round trip time of a hybrid automatic repeat request (HARD), and wherein the low power state is a discontinuous transmission (DTX) cycle.
14. The apparatus of claim 11 ,
wherein the data is transmitted in accordance with a sub-frame bundle size, wherein the sub-frame bundle size is dynamically determined at least once during voice and/or data communications.
15. The apparatus of claim 14 ,
wherein the bundle size specifies a number of a plurality of redundancy versions of first information transmitted to the base station.
16. The apparatus of claim 11 ,
wherein the processing element is further configured to:
receive, in accordance with a hybrid automatic repeat request (HARD) timeline, an acknowledgement/negative acknowledgement (ACK/NACK) of the transmission of data, wherein the ACK/NACK is a first NACK received X sub-frames after transmission of the data, and wherein the data comprises a first redundancy version of the data;
receive, 3X sub-frames after transmission of the data, a second NACK of the transmission of data; and
generate instructions to transmit, X sub-frames after receipt of the second NACK, a second redundancy version of the data.
17. A non-transitory computer readable memory medium storing program instructions executable by a processor of a user equipment (UE) to:
indicate, to a base station and via a radio resource control (RRC) message, that the UE has a transmission limitation, wherein the transmission limitation causes the UE to not transmit continuously in uplink (UL);
receive, from the base station, an UL grant on a physical downlink control channel (PDCCH) for transmission on physical uplink shared channel (PUSCH) resources assigned to the UE;
generate instructions to transmit, to the base station, data according to the UL grant on a time portion of the PUSCH resources assigned to the UE; and
generate instructions to not transmit during a specified time portion of the PUSCH resources assigned to the UE in accordance with the indicated transmission limitation.
18. The non-transitory memory medium of claim 17 ,
wherein the specified time portion corresponds to a duty cycle of the UE, wherein the duty cycle is based on a number of UL transmissions the UE will remain in a low power state and a round trip time of a hybrid automatic repeat request (HARD), and wherein the low power state is a discontinuous transmission (DTX) cycle.
19. The non-transitory memory medium of claim 17 ,
wherein the data is transmitted in accordance with a sub-frame bundle size, wherein the sub-frame bundle size is dynamically determined at least once during voice and/or data communications, and wherein the bundle size specifies a number of a plurality of redundancy versions of first information transmitted to the base station.
20. The non-transitory memory medium of claim 17 ,
wherein the program instructions are further executable to receive, from the base station, a first negative acknowledge (NACK) after transmission of the data, wherein the UE does not perform a retransmission of the data in response to receiving the first NACK.