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EP-4742776-A2 - UE POWER SAVINGS IN MULTI-BEAM OPERATION

EP4742776A2EP 4742776 A2EP4742776 A2EP 4742776A2EP-4742776-A2

Abstract

Methods, systems, and devices may enable UE power savings in multi-beam connectivity using multi-TRPs or multi-UE panels. Methods, systems, and devices may enable PDCCH skipping in the active duration of the UE by skipping PDCCH monitoring associated with groups of CORESETs.

Inventors

  • IYER, LAKSHMI R.
  • LI, QING
  • SVEDMAN, PATRICK
  • ZHANG, GUODONG
  • AWADIN, MOHAMED
  • LI, YIFAN
  • TSAI, ALLAN Y.
  • ADJAKPLE, PASCAL M.

Assignees

  • InterDigital Patent Holdings, Inc.

Dates

Publication Date
20260513
Application Date
20201002

Claims (15)

  1. A wireless transmit/receive unit (WTRU) comprising a processor and a memory, the processor and memory configured to: receive a first wake-up indication from a first transmission and reception point (TRP); and in response to the first wake-up indication, wake up to monitor control resource set (CORESET) groups (COGs) of the first TRP and a second TRP.
  2. The WTRU of claim 1, the processor further configured to: receive a second wake-up indication from the second TRP, wherein the second TRP is received at approximately the same time as the first wakeup indication, and wherein the wake up to monitor the COGs of the first TRP and the second TRP is based on the receiving of the second wake-up indication from the second TRP.
  3. The WTRU of claim 1, wherein the first wake-up indication is received through repeated transmissions on different CORESETs.
  4. The WTRU of claim 1, the processor further configured to: receive a second wake-up indication from the second TRP; and based on receiving the second wake-up indication from the second TRP, receive instructions to not monitor for repeated power-savings indications (PSIs) during a pre-OnDuration-window (POW).
  5. The WTRU of claim 1, wherein the first TRP is associated with a first COG of the COGs and the second TRP is associated with a second COG of the COGs.
  6. The WTRU of claim 1, the processor further configured to: receive a go-to-sleep indication from the second TRP, wherein the first TRP is associated with a first COG of the COGs and the second TRP is associated with a second COG of the COGs; and based on receiving the go-to-sleep indication from the second TRP, not monitoring the second COG while monitoring the first COG.
  7. The WTRU of claim 1, the processor further configured to: receive a go-to-sleep indication from the first TRP, wherein the first TRP is associated with a first COG of the COGs and the second TRP is associated with a second COG of the COGs; and based on receiving the go-to-sleep indication from the first TRP, not monitoring the second COG, while monitoring the first COG.
  8. The WTRU of claim 1, the processor further configured to: monitor a group-common PDCCH for a power-savings indication (PSI); detect a PSI in the group-common PDCCH; and based on the PSI, switch, in a subsequent DRX cycle, an activated BWP for data transmission and reception.
  9. A method implemented by a wireless/transmit receive unit, the method comprising: receiving a first wake-up indication from a first transmission and reception point (TRP); and in response to the first wake-up indication, waking up to monitor control resource set (CORESET) groups (COGs) of the first TRP and a second TRP.
  10. The method of claim 9, further comprising: receiving a second wake-up indication from the second TRP, wherein the second TRP is received at approximately the same time as the wakeup indication, and wherein the waking up to monitor the COGs of the first TRP and the second TRP is based on the receiving of the second wake-up indication from the second TRP.
  11. The method of claim 9, wherein the wake-up indication is received through repeated transmissions on different CORESETs.
  12. The method of claim 9, further comprising: receiving a second wake-up indication from the second TRP; and based on receiving the second wake-up indication from the second TRP, receiving instructions to not monitor for repeated power-savings indications (PSIs) during a pre-OnDuration-window (POW).
  13. The method of claim 9, wherein the first TRP is associated with a first COG of the COGs and the second TRP is associated with a second COG of the COGs.
  14. The method of claim 9, further comprising: receiving a go-to-sleep indication from the second TRP, wherein the first TRP is associated with a first COG of the COGs and the second TRP is associated with a second COG of the COGs; and based on receiving the go-to-sleep indication from the second TRP, not monitoring the second COG, while monitoring the first COG.
  15. The method of claim 9, further comprising: receiving a go-to-sleep indication from the first TRP, wherein the first TRP is associated with a first COG of the COGs and the second TRP is associated with a second COG of the COGs; and based on receiving the go-to-sleep indication from the first TRP, not monitoring the second COG, while monitoring the first COG.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Patent Application No. 62/909,993, filed on October 3, 2019, entitled "UE Power Savings in Multi-Beam Operations," the contents of which are hereby incorporated by reference herein. BACKGROUND UE Power Savings. PDCCH monitoring is a primary source of excess power consumption in the RRC-CONNECTED state and can be improved by reducing excessive PDCCH monitoring. The power savings can come by avoiding unnecessary PDCCH decoding especially if the UE is not being scheduled. The discontinuous reception (DRX) framework was introduced to allow the UE to sleep for significant periods of time to reduce power consumption. Here, the UE wakes up and monitors PDCCH during the ON Duration. If it does not receive a grant in the ON Duration, it goes back to sleep. If it receives a grant, it sets the DRX inactivity Timer and continues to monitor PDCCH until the timer expires or the network signals it to sleep through a MAC CE. The UE resets the inactivity timer every time it receives a grant. However, this did not address excessive PDCCH monitoring within the UE's active time which may include the ON duration and the period when the inactivity timer is running. A power savings indication (PSI) may be considered to indicate if a UE must wake up for the On Duration of a DRX cycle or if the UE can skip monitoring in the On Duration. This indication is signaled outside the active time of the UE. The concept is shown in Figure 1. A power savings indication (PSI) may also be considered to indicate a power savings configuration within the active time of the UE to change the cross-slot scheduling parameters so that UE can save power by optimizing its processing and avoiding unnecessary and early buffering of PDSCH. K0 and K2 parameters for indicating the grant-to-PDSCH and grant-to-PUSCH timing can be set in a way that enables low power consumption. With small values of minimum K0 and minimum K2, the power consumption is usually higher. This is because the UE does not know the actual K0 and K2 values which are signaled in the DCI until it finishes the decoding, but it must plan to buffer the symbols according to the minimum values of K0 or process the transport block according to the minimum value of K2. Smaller K0 and K2 values are preferred for URLLC and larger values suffice for eMBB. Multi-TRP and Multi-panel Transmissions. Increased diversity and robustness are achieved by both ideal and non-ideal backhaul networks using multi-Transmission and Reception Point (TRP) and multi-panel transmissions and receptions. A panel may be a group of physical antennas for transmission or reception. A panel may be a logical entity to which a set of physical antennas are mapped. In some cases, a panel (for transmission) is associated with a transmitter chain. In some cases, a panel (for transmission) is associated with multiple transmitter chains. In some cases, a panel (for reception) is associated with a receiver chain. In some cases, a panel (for reception) is associated with multiple receiver chains. In some cases, the Tx beams on different panels for transmission (of a TRP or a UE) can be controlled independently. In some cases, the Rx beams on different panels for transmission (of a TRP or a UE) can be controlled independently. A group of physical antennas for transmission corresponding to a panel may be the same as a group of physical antennas for reception corresponding to a panel. This could mean that the panels for transmission and the panels for reception (of a TRP or UE) correspond to the same groups of physical antennas. In other cases, however, some or all of the panels for transmission (of a TRP or UE) correspond to different groups of physical antennas than the panels for reception. In some cases, the number of panels for transmission and the number of panels for reception are the same in a TRP or UE, and in other cases the number is different. In some cases, panels may point in different directions, e.g. provide different transmission or reception directivity, for example since the physical antennas of a panel have the same (or similar) directivity, while physical antennas of different panels may have different directivity. In some cases, the physical antennas of a panel are mounted on a plane, e.g. a 2-D physical plane comprising M rows and N columns of cross-polarized physical antenna pairs, where example numbers could be M=1, 2, 4, 8 and N=1, 2, 4, 8 in various combinations. In a multi-TRP network, the UE communicates with multiple TRPs as shown in Figure 2. Typically, the TRPs are accessed by the UE on different transmit and receive beams. A TRP may be equipped with one or multiple panels for transmission or reception. In some cases, the term TRP and panel can be used inter-changeably. In some cases, different TRPs may refer to geographically separated points for transmission or reception, for example separated by ten meters or m