Method for defining uplink (UL) transmission timing accuracy
Certain aspects of the present disclosure provide techniques for wireless communications by a user equipment (UE). The UE detects at least one of a first type of reference signal (RS) or a second type of RS within an active bandwidth part (BWP). The UE then derives uplink (UL) transmission timing and corresponding accuracy requirement, based on which type of RS was detected. The UE then transmits UL signals based on the derived UL transmission timing and the corresponding accuracy requirement.
1 . A method for wireless communications by a user equipment (UE), comprising:
transmitting signaling to a network entity, the signaling indicating a request for a measurement gap to detect a reference signal (RS) outside an active bandwidth part (BWP);
receiving an indication of the measurement gap from the network entity;
detecting the RS outside the active BWP based on the measurement gap; and
deriving uplink (UL) transmission timing and corresponding accuracy requirement based on a measurement of the RS detected outside the active BWP.
2 . The method of claim 1 , wherein the RS comprises a synchronization signal block (SSB).
3 . The method of claim 1 , wherein the RS comprises at least one of a tracking reference signal (TRS) or a channel state information reference signal (CSI-RS).
4 . The method of claim 1 , wherein the detecting comprises performing the measurement of the RS outside the active BWP to derive the UL transmission timing and the corresponding accuracy requirement.
5 . The method of claim 1 , further comprising using an intra-frequency measurement gap to detect and measure the RS outside the active BWP.
6 . A method for wireless communications by a user equipment (UE), comprising:
detecting at least one of a first type of reference signal (RS) or a second type of RS within an active bandwidth part (BWP);
deriving uplink (UL) transmission timing and corresponding accuracy requirement, based on which type of RS is detected within the active BWP; and
transmitting UL signals based on the derived UL transmission timing and the corresponding accuracy requirement.
7 . The method of claim 6 , wherein:
the first type of RS comprises a synchronization signal block (SSB); and
the second type of RS comprises at least one of a tracking reference signal (TRS) or a channel state information reference signal (CSI-RS).
8 . The method of claim 6 , wherein the deriving comprises deriving the UL transmission timing and the corresponding accuracy requirement based on the first type of RS, when the first type of RS is detected within the active BWP.
9 . The method of claim 6 , further comprising receiving an indication, from a network entity, to select at least one of the first type of RS or the second type of RS for deriving the UL transmission timing and the corresponding accuracy requirement, when both the first type of RS and the second type of RS are detected within the active BWP.
10 . The method of claim 9 , wherein the indication is received via at least one of: system information (SI), radio resource control (RRC) signaling, a physical downlink control channel (PDCCH), or a medium access control (MAC) control element (CE).
11 . The method of claim 6 , wherein the deriving comprises deriving the UL transmission timing and the corresponding accuracy requirement based on an availability of the second type of RS, when the first type of RS is not detected within the active BWP.
12 . The method of claim 6 , wherein the UL transmission timing and the corresponding accuracy requirement are based on a sub carrier spacing (SCS) of an RS detected by the UE and the UL signals.
13 . The method of claim 6 , wherein the UL transmission timing and the corresponding accuracy requirement are based on an availability of at least one of the first type of RS or the second type of RS within a last period.
14 . The method of claim 13 , wherein durations of a period between the first type of RS and the second type of RS are different.
15 . The method of claim 14 , wherein a duration of the period between the first type of RS and the second type of RS is based on a capability of the UE indicating a number of receiver (RX) branches.
16 . The method of claim 14 , wherein a duration of the period between the first type of RS and the second type of RS is based on a capability of the UE indicating an antenna efficiency of the UE.
17 . The method of claim 16 , further comprising sending signaling, to a network entity, indicating the capability of the UE via at least one of: a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH).
18 . The method of claim 6 , further comprising:
sending signaling, to a network entity, indicating a requirement for a measurement gap to measure an RS outside the active BWP; and
receiving, from the network entity, an indication of the measurement gap to measure the RS outside the active BWP for deriving the UL transmission timing and the corresponding accuracy requirement.
19 . The method of claim 18 , further comprising using the measurement gap to measure intra-frequency RSs outside the active BWP.
20 . The method of claim 19 , further comprising measuring at least one of: a signal to interference plus noise ratio (SINR), a reference signal receive power (RSRP), or a reference signal receive quality (RSRQ) of the intra-frequency RSs.
21 . The method of claim 6 , wherein the UL transmission timing and the corresponding accuracy requirement are based on a number of tones and reference blocks (RBs) used by at least one of the first type of RS or the second type of RS.
22 . A user equipment (UE) configured for wireless communications, comprising:
a memory comprising computer-executable instructions; and
a processor configured to execute the computer-executable instructions and cause the UE to:
transmit signaling to a network entity, the signaling indicating a request for a measurement gap to detect a reference signal (RS) outside an active bandwidth part (BWP);
receive an indication of the measurement gap from the network entity;
detect the RS outside the active BWP based on the measurement gap; and
derive uplink (UL) transmission timing and corresponding accuracy requirement based on a measurement of the RS detected outside the active BWP.
23 . The UE of claim 22 , wherein the RS comprises a synchronization signal block (SSB).
24 . The UE of claim 22 , wherein the RS comprises at least one of a tracking reference signal (TRS) or a channel state information reference signal (CSI-RS).
25 . The UE of claim 22 , wherein the detection comprises the measurement of the RS outside the active BWP to derive the UL transmission timing and the corresponding accuracy requirement.
26 . The UE of claim 25 , wherein the processor is further configured to execute the computer-executable instructions and cause the UE to: use an intra- frequency measurement gap to detect and measure the RS outside the active BWP.
27 . A user equipment (UE) configured for wireless communications, comprising:
a memory comprising computer-executable instructions; and
a processor configured to execute the computer-executable instructions and cause the UE to:
detect at least one of a first type of reference signal (RS) or a second type of RS within an active bandwidth part (BWP);
derive uplink (UL) transmission timing and corresponding accuracy requirement, based on which type of RS is detected within the active BWP; and
transmit UL signals based on the derived UL transmission timing and the corresponding accuracy requirement.
28 . The UE of claim 27 , wherein the UL transmission timing and the corresponding accuracy requirement are based on an availability of at least one of the first type of RS or the second type of RS within a last period.
29 . The UE of claim 27 , wherein the UL transmission timing and the corresponding accuracy requirement are based on a number of tones and reference blocks (RBs) used by at least one of the first type of RS or the second type of RS.