Method and apparatus for timing advance adjustment
Apparatuses and methods for timing advance (TA) adjustment. A method includes receiving first information indicating use of same power and continuous phase for transmission of a channel over a number of slots and second information indicating a first TA value. The method includes determining a second slot for adjusting a time for the transmission of the channel based on the first TA value, a first power for the transmission of the channel in slots before the second slots, and a second power for the transmission of the channel in slots starting from the second slot. The method further includes adjusting the time for the transmission of the channel in the second slot based on the first TA value and transmitting the channel with a first power in slots before the second slot and with a second power in slots starting from the second slot.
1 . A user equipment (UE) comprising:
a transceiver configured to:
receive, from a base station, first information indicating that restarting a time domain window (TDW) after an event which causes power consistency and phase continuity not to be maintained in a nominal TDW is enabled, wherein the nominal TDW includes a first actual TDW and a second actual TDW, and
receive, from the base station, a timing advance command, wherein timing adjustment in the nominal TDW as a response to the timing advance command is the event which causes power consistency and phase continuity not to be maintained; and
a processor operably coupled to the transceiver, the processor configured to determine that a start of the second actual TDW is a first symbol of a physical uplink shared channel (PUSCH) transmission after the event based on the first information, wherein the PUSCH transmission is in a slot related to a PUSCH repetition.
2 . The UE of claim 1 , wherein the UE is capable of restarting demodulation-reference signal (DM-RS) bundling after the event.
3 . The UE of claim 1 , wherein the time advance command is included in a medium access control (MAC) control element (MAC CE).
4 . The UE of claim 1 , wherein:
the processor is further configured to determine a second power for the PUSCH transmission in the second actual TDW, and
the transceiver is further configured to transmit a PUSCH based on the second power after the event.
5 . A base station (BS) comprising:
a processor configured to configure a slot for a physical uplink shared channel (PUSCH) repetition and a nominal time domain window (TDW), wherein the nominal TDW includes a first actual TDW and a second actual TDW; and
a transceiver operably coupled to the processor, the transceiver configured to:
transmit, to a user equipment (UE), first information indicating that restarting a TDW after an event which causes power consistency and phase consistency not to be maintained in the nominal TDW is enabled, and
transmit, to the UE, a timing advance command,
wherein timing adjustment in the nominal TDW as a response to the timing advance command is the event which causes power consistency and phase continuity not to be maintained, and
wherein the first information enables the UE to determine that a start of the second actual TDW is a first symbol of a PUSCH transmission after the event, wherein the PUSCH transmission is in a slot related to the PUSCH repetition.
6 . The BS of claim 5 , wherein UE is capable of restarting demodulation-reference signal (DM-RS) bundling after the event.
7 . The BS of claim 5 , wherein the time advance command is included in a medium access control (MAC) control element (MAC CE).
8 . The BS of claim 5 , wherein:
the transceiver is further configured to receive, from the UE, a PUSCH based on a second power, and
the second power for the PUSCH transmission is related to the second actual TDW.
9 . A method performed by a user equipment (UE), the method comprising:
receiving, from a base station, first information indicating that restarting a TDW after an event which causes power consistency and phase consistency not to be maintained in a nominal TDW is enabled, wherein the nominal TDW includes a first actual TDW and a second actual TDW;
receiving, from the base station, a timing advance command, wherein timing adjustment in the nominal TDW as a response to the timing advance command is the event which causes power consistency and phase continuity not to be maintained; and
determining that a start of the second actual TDW is a first symbol of a physical uplink shared channel (PUSCH) transmission after the event based on the first information, wherein the PUSCH transmission is in a slot related to a PUSCH repetition.
10 . The method of claim 9 , wherein the UE is capable of restarting demodulation-reference signal (DM-RS) bundling after the event.
11 . The method of claim 9 , wherein the time advance command is included in a medium access control (MAC) control element (MAC CE).
12 . The method of claim 9 , further comprising:
determining a second power for the PUSCH transmission in the second actual TDW; and
transmitting a PUSCH based on the second power after the event.