Simultaneous transmission in multiple timing advance groups
AssigneeTexas Instruments Incorporated
InventorsAnthony Edet Ekpenyong, Ralf Matthias Bendlin, Pierre Bertrand
Life of this patent
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Abstract
Systems and methods for specifying UE power control allocation for simultaneous transmission of PRACH in a secondary serving cell and PUCCH/PUSCH/SRS in a different serving cell in another timing advance group are disclosed. Rules are provided for prioritizing transmission of PRACH and/or other UL channels/signals. Additionally, UE power allocation is controlled for misaligned subframes across different timing advance groups. Latency of UL synchronization for a secondary serving cell is reduced by prioritizing PRACH retransmission.
Claims16
A method comprising:
- performing by one or more processors in a user equipment device,
- receiving a Physical Downlink Control Channel (PDCCH) order to initiate a random access procedure on a first serving cell that belongs to a first timing advance group;
- identifying a Physical Uplink Control Channel (PUCCH) transmission for a second serving cell other than the first serving cell, the second serving cell belonging to a second timing advance group different than the first timing advance group, wherein if a channel state information (CSI) report is scheduled for the PUCCH transmission, and there is no HARQ-ACK feedback in the same subframe as a Physical Random Access Channel (PRACH) transmission on the first serving cell, the CSI report is dropped and the PRACH transmission is transmitted;
- transmitting a PRACH transmission to the first serving cell in a subframe;
- transmitting the PUCCH transmission to the second serving cell in the same subframe when the CSI report is not dropped;
- and
- adjusting a transmission power of the PUCCH transmission to prioritize the PRACH transmission over the PUCCH transmission.
A user equipment device, comprising:
- a processor configured to:
- identify a Physical Downlink Control Channel (PDCCH) order to initiate a random access procedure on a first serving cell that belongs to a first timing advance group;
- identify a Physical Uplink Control Channel (PUCCH) transmission for a second serving cell other than the first serving cell, the second serving cell belonging to a second timing advance group different than the first timing advance group, wherein if a channel state information (CSI) report is scheduled for the PUCCH transmission, and there is no HARQ-ACK feedback in the same subframe as a Physical Random Access Channel (PRACH) transmission on the first serving cell, the CSI report is dropped and the PRACH transmission is transmitted;
- generate a PRACH transmission for the first serving cell in a subframe;
- and
- generate the PUCCH transmission for the second serving cell in the same subframe when the CSI report is not dropped;
- and
- a modem configured to, when the CSI report is not dropped, transmit the PUCCH and PRACH transmissions to one or more base stations, and to adjust a transmission power of the PUCCH transmission to prioritize the PRACH transmission over the PUCCH transmission.
Dependencies are inferred from the claim text.