Discontinuous reception mode communication techniques

Patent metadata

Field	Value
Publication number	US-2025016875-A1
Application number	US-202218712228-A
Country	US
Kind code	A1
Filing date	Jan 26, 2022
Priority date	Jan 26, 2022
Publication date	Jan 9, 2025
Grant date	—

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE may be configured to communicate with a base station in a discontinuous reception (DRX) mode according to a DRX cycle. The UE may receive signaling that indicates a configuration of a ramp window associated with the DRX cycle. The ramp window may include a set of slots that is adjacent to a sleep window of the DRX cycle and, in some examples, is adjacent to an on-window of the DRX cycle. The set of slots may include a first subset of wakeup slots and a second subset of sleep slots. During the ramp window, the UE may monitor for a transport block from the base station during the first subset of wakeup slots. If the UE receives the transport block during a wakeup slot, the UE may transition to the on-window of the DRX cycle.

First claim

What is claimed is:

1 . A method for wireless communication at a user equipment (UE), comprising:
receiving, from a base station, signaling that indicates a configuration of a ramp window that is associated with a discontinuous reception cycle of the UE, the ramp window including a set of slots adjacent to a sleep window of the discontinuous reception cycle, wherein the set of slots includes a first subset of wakeup slots during which the UE is in an on-state and a second subset of sleep slots during which the UE is in a sleep state; and monitoring for a transport block from the base station during the first subset of wakeup slots in accordance with the configuration of the ramp window.

2 . The method of claim 1 , further comprising:
receiving the transport block during a wakeup slot of the first subset of wakeup slots based at least in part on the monitoring; and transitioning to an on-window of the discontinuous reception cycle based at least in part on receiving the transport block during the wakeup slot.

3 . The method of claim 2 , further comprising:
initiating an inactivity timer associated with the discontinuous reception cycle in response to receiving the transport block during the wakeup slot, wherein an expiration of the inactivity timer indicates for the UE to transition to the sleep window.

4 . The method of claim 1 , wherein the set of slots occur before an on-window of the discontinuous reception cycle, the method comprising:
transitioning to the on-window of the discontinuous reception cycle based at least in part on failing to receive the transport block during the first subset of wakeup slots.

5 . The method of claim 1 , wherein the set of slots occur after an on-window of the discontinuous reception cycle, the method comprising:
transitioning to the sleep window of the discontinuous reception cycle based at least in part on failing to receive the transport block during the first subset of wakeup slots.

6 . The method of claim 1 , further comprising:
receiving, from the base station, a control message that activates the monitoring of the transport block in accordance with the configuration of the ramp window.

7 . The method of claim 1 , wherein wakeup slots of the first subset of wakeup slots alternate with sleep slots of the second subset of sleep slots in time.

8 . The method of claim 1 , wherein:
the ramp window includes a first duration and a second duration, the first duration closer in time to an on-window of the discontinuous reception cycle than the second duration, and the first duration includes a first quantity of wakeup slots of the first subset of wakeup slots that is greater than a second quantity of wakeup slots of the first subset of wakeup slots included in the second duration based at least in part on the first duration being closer in time to the on-window of the discontinuous reception cycle.

9 . The method of claim 1 , wherein a location of the first subset of wakeup slots within the ramp window and a location of the second subset of sleep slots within the ramp window are based at least in part on a jitter of an uplink message transmitted by the UE, the jitter of the uplink message corresponding to a difference between an arrival time of the uplink message and a scheduled reception time of the uplink message.

10 . The method of claim 9 , wherein:
the configuration for the ramp window indicates a location of a first group of slots of the set of slots comprising a greater quantity of wakeup slots than sleep slots based at least in part on the jitter of the uplink message, and the configuration for the ramp window indicates a location of a second group of slots of the set of slots comprising a greater quantity of sleep slots than wakeup slots based at least in part on the jitter of the uplink message.

11 . The method of claim 1 , wherein the configuration for the ramp window indicates a location of a first group of slots of the set of slots comprising a greater quantity of wakeup slots than sleep slots, and wherein wakeup slots of the first subset of wakeup slots and excluded from the first group of slots alternate in time with sleep slots of the second subset of sleep slots and excluded from the first group of slots.

12 . The method of claim 1 , wherein the signaling indicates a second configuration of a second ramp window associated with the discontinuous reception cycle, the second ramp window including a second set of slots outside the sleep window of the discontinuous reception cycle, and wherein the second set of slots includes a third subset of wakeup slots and a fourth subset of sleep slots.

13 . The method of claim 12 , wherein the ramp window and the second ramp window are consecutive in time, and wherein an on-window of the discontinuous reception cycle corresponds to the ramp window and the second ramp window.

14 . The method of claim 1 , wherein an on-window of the discontinuous reception cycle corresponds to the ramp window comprising the first subset of wakeup slots and the second subset of sleep slots.

15 . The method of claim 1 , wherein the set of slots is adjacent to an on-window of the discontinuous reception cycle.

16 . The method of claim 1 , wherein a quantity of slots included in the set of slots is based at least in part on a statistical probability that a downlink message scheduled for reception during an on-window of the discontinuous reception cycle is received outside of the on-window.

17 . An apparatus for wireless communication at a user equipment (UE), comprising:
a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to:
receive, from a base station, signaling that indicates a configuration of a ramp window that is associated with a discontinuous reception cycle of the UE, the ramp window including a set of slots adjacent to a sleep window of the discontinuous reception cycle, wherein the set of slots includes a first subset of wakeup slots during which the UE is in an on-state and a second subset of sleep slots during which the UE is in a sleep state; and
monitor for a transport block from the base station during the first subset of wakeup slots in accordance with the configuration of the ramp window.

18 . The apparatus of claim 17 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive the transport block during a wakeup slot of the first subset of wakeup slots based at least in part on the monitoring; and transition to an on-window of the discontinuous reception cycle based at least in part on receiving the transport block during the wakeup slot.

19 . The apparatus of claim 17 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive, from the base station, a control message that activates the monitoring of the transport block in accordance with the configuration of the ramp window.

20 . The apparatus of claim 17 , wherein wakeup slots of the first subset of wakeup slots alternate with sleep slots of the second subset of sleep slots in time.

21 . The apparatus of claim 17 , wherein:
the ramp window includes a first duration and a second duration, the first duration closer in time to an on-window of the discontinuous reception cycle than the second duration, and the first duration includes a first quantity of wakeup slots of the first subset of wakeup slots that is greater than a second

Assignees

• Qualcomm Inc

Inventors

• Zhou Zhichao
• Agarwal Ravi
• Xu Hao

Classifications

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04L5/0026

  Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL] · CPC title

• H04L5/008

  once only, on installation · CPC title