Techniques for UE power saving and UE complexity reduction
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives, in a first slot and from a base station, a first signal that is a downlink data signal in a first frequency resource allocation. The UE communicates, with the base station, a second signal in a second slot. A configured time gap between the first slot and the second slot is according to a comparison of the first frequency resource allocation and a second frequency resource allocation.
1 . A method of wireless communication of a user equipment (UE), comprising:
receiving, in a first slot and from a base station, a first signal that is a downlink data signal in a first frequency resource allocation, wherein the first frequency resource allocation has a first bandwidth of the first signal, wherein the first bandwidth is a total bandwidth span of frequency resources of the first signal or a total utilized bandwidth of the frequency resources of the first signal; and
communicating, with the base station, a second signal in a second slot, wherein a configured time gap between the first slot and the second slot is according to a comparison of the first frequency resource allocation and a second frequency resource allocation, wherein the second frequency resource allocation has a second bandwidth, wherein the comparison of the first frequency resource allocation and the second frequency resource allocation is a comparison of the first bandwidth and the second bandwidth.
2 . The method of claim 1 , wherein when the second bandwidth is less than the first bandwidth, the configured time gap is a first time gap and includes one or more slots that allow the UE to process at least the first signal and the second signal.
3 . The method of claim 2 , wherein when the second bandwidth is not less than the first bandwidth, the configured time gap is a second time gap and includes zero or more slots that allow the UE to process at least the first signal and the second signal.
4 . The method of claim 3 , wherein the first time gap is not smaller than the second time gap.
5 . The method of claim 3 , wherein the first time gap is N1+N2+X+N and the second time gap is N1+N2+X, wherein:
N1 represents a PDSCH processing time corresponding to a capability of the UE,
N2 represents a PUSCH preparation time corresponding to the capability of the UE,
X represents a time duration required for UE to process medium access control (MAC) control elements (CEs); and
N represents an additional time duration that the UE requires for processing a random access response (RAR) message that is scheduled in a frequency resource allocation larger than the second bandwidth.
6 . The method of claim 1 , wherein the second bandwidth is pre-configured at the UE or received from the base station.
7 . The method of claim 1 , wherein the second bandwidth correlates with a processing capability of the UE.
8 . The method of claim 7 , further comprising: reporting the processing capability to the base station.
9 . The method of claim 1 , wherein the downlink data signal comprises a physical downlink shared channel (PDSCH) carrying a random access response (RAR) message with a RAR uplink (UL) grant, and wherein the second signal comprises a physical uplink shared channel (PUSCH) scheduled by the RAR UL grant.
10 . The method of claim 1 , wherein the downlink data signal comprises a MsgB physical downlink shared channel (PDSCH) in a random access procedure, and wherein the second signal comprises a physical uplink control channel (PUCCH) carrying a hybrid automatic repeat request (HARQ) acknowledgement (ACK) in response to receiving the MsgB PDSCH.
11 . A method of wireless communication of a base station, comprising:
transmitting, in a first slot, a first signal that is a downlink data signal in a first frequency resource allocation, wherein the first frequency resource allocation has a first bandwidth of the first signal, wherein the first bandwidth is a total bandwidth span of frequency resources of the first signal or a total utilized bandwidth of the frequency resources of the first signal; and
communicating, with a user equipment (UE), a second signal in a second slot, wherein a configured time gap between the first slot and the second slot is according to a comparison of the first frequency resource allocation and a second frequency resource allocation, wherein the second frequency resource allocation has a second bandwidth, wherein the comparison of the first frequency resource allocation and the second frequency resource allocation is a comparison of the first bandwidth and the second bandwidth.
12 . The method of claim 11 , wherein when the second bandwidth is less than the first bandwidth, the configured time gap is a first time gap and includes one or more slots that allow the UE to process at least the first signal and the second signal.
13 . The method of claim 12 , wherein when the second bandwidth is not less than the first bandwidth, the configured time gap is a second time gap and includes zero or more slots that allow the UE to process at least the first signal and the second signal.
14 . The method of claim 13 , wherein the first time gap is not smaller than the second time gap.
15 . The method of claim 13 , wherein the first time gap is N1+N2+X+N and the second time gap is N1+N2+X, wherein:
N1 represents a PDSCH processing time corresponding to a capability of the UE,
N2 represents a PUSCH preparation time corresponding to the capability of the UE,
X represents a time duration required for the UE to process medium access control (MAC) control elements (CEs); and
N represents an additional time duration for the UE to process a random access response (RAR) message scheduled in a frequency resource allocation larger than the second bandwidth.
16 . An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, in a first slot and from a base station, a first signal that is a downlink data signal in a first frequency resource allocation, wherein the first frequency resource allocation has a first bandwidth of the first signal, wherein the first bandwidth is a total bandwidth span of frequency resources of the first signal or a total utilized bandwidth of the frequency resources of the first signal; and
communicate, with the base station, a second signal in a second slot, wherein a configured time gap between the first slot and the second slot is according to a comparison of the first frequency resource allocation and a second frequency resource allocation, wherein the second frequency resource allocation has a second bandwidth, wherein the comparison of the first frequency resource allocation and the second frequency resource allocation is a comparison of the first bandwidth and the second bandwidth.