User equipment comprising multiple antennas

Patent metadata

Field	Value
Publication number	US-2023412242-A1
Application number	US-202318338566-A
Country	US
Kind code	A1
Filing date	Jun 21, 2023
Priority date	Jun 21, 2022
Publication date	Dec 21, 2023
Grant date	—

Abstract

User equipment (UE) may be provided that includes means for: reporting at least one candidate CSI beam index to a network to avoid and/or mitigate a maximum permissible exposure (MPE) event; wherein the user equipment associates at least one candidate antenna of the user equipment to the at least one candidate CSI beam index. An apparatus may also be provided that includes means for: creating a first mapping of antennas to downlink path delay intervals using a wider beam downlink reference signal; creating a second mapping of downlink path delay intervals to downlink spatial filters using different narrower beam reference signals; and controlling the selection of an antenna based on second mapping.

First claim

1 . User equipment comprising:
at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: reporting at least one candidate channel state index beam index to a network to avoid and/or mitigate a maximum permissible exposure event; wherein the user equipment associates at least one candidate antenna of the user equipment to the at least one candidate channel state index beam index.

2 . User equipment as claimed in claim 1 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to report at least one candidate channel state index beam index to the network in a Power Headroom Report.

3 . User equipment as claimed in claim 1 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to report, to the network, allowed reduction of maximum power level for the at least one candidate channel state index beam index.

4 . User equipment as claimed in claim 1 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to report multiple non-serving candidate channel state index beam indexes to the network to avoid and/or mitigate a maximum permissible exposure event.

5 . User equipment as claimed in claim 4 , wherein the user equipment associates at least one non-serving antenna of the user equipment to the multiple non-serving candidate channel state index beam indexes and/or the user equipment associates multiple non-serving antennas of the user equipment to the multiple non-serving candidate channel state index beam indexes.

6 . User equipment as claimed in claim 1 , wherein the maximum permissible exposure event that is avoided and/or mitigated by reporting the at least one candidate channel state index beam index to the network is associated with a serving antenna different to the at least one candidate antenna of the user equipment associated to the at least one candidate channel state index beam index and wherein the at least one candidate antenna of the user equipment does not have a maximum permissible exposure event or has a less severe maximum permissible exposure event than the maximum permissible exposure event at the serving antenna.

7 . User equipment as claimed in claim 1 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:
use at least one serving antenna to communicate via a beam associated with at least one serving channel state index beam index, wherein the at least one serving antenna is different to the at least one candidate antenna and wherein the at least one serving channel state index beam index, associated with the serving antenna, is different to the at least one candidate channel state index beam index associated with the at least one candidate antenna; and associate a candidate antenna and a candidate channel state index beam index in response to the combination of candidate antenna and associated candidate channel state index beam index being usable and having a lower power backoff requirement than the combination of the serving antenna and the associated serving channel state index beam index.

8 . User equipment as claimed in claim 4 , wherein the one or more non-serving candidate channel state index beam indexes are associated with at least one candidate antenna panel that does not serve, at least in downlink, a serving channel state index beam index.

9 . User equipment as claimed in claim 1 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to switch to using a non-serving antenna of the user equipment associated with a candidate channel state index beam index that is, has been, or will be reported.

10 . User equipment as claimed in claim 1 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to:
create a first mapping of antennas to downlink path delay intervals using a wider beam downlink reference signal; create a second mapping of downlink path delay intervals to downlink spatial filters using different narrower beam reference signals identified using channel state index beam indexes; and control association of the at least one non-serving antenna and at least one candidate channel state index beam index based on the first mapping and the second mapping.

11 . User equipment as claimed in claim 10 , wherein the at least one memory and the computer program code are further configured to, with the at least one processor, cause the apparatus to: control the selection of an antenna based on the first mapping and the second mapping.

12 . User equipment as claimed in claim 10 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to create the first mapping by:
performing a power delay profile estimation for each antenna using the wider beam downlink reference signal; and for each antenna, grouping peak delays in the power delay profile for the antenna as downlink path delay intervals for that antenna to provide the first mapping of antennas to downlink path delay intervals, and/or wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to create the second mapping by: performing a power delay profile estimation for different downlink spatial filters using an antenna to receive a sweep of narrower beam reference signals that have at least the different downlink spatial filters; and for each of the different downlink spatial filters, grouping peaks delays in the power delay profile for a downlink angle of departure with downlink path delay intervals for that downlink angle of departure to provide the second mapping of downlink path delay intervals to downlink spatial filters.

13 . User equipment as claimed in claim 10 , wherein the wider beam downlink reference signal is a Synchronization Signal Block signal or a Channel State Information Reference Signal and the user equipment is configured to inform the network in dependence upon:
better quality being available on the selected antenna compared to a current in-use antenna when using a different angle of departure to the current in-use angle of departure; and/or better quality is available on the selected antenna compared to the current in-use antenna when using a same angle of departure to the current in-use angle of departure.

14 . A method comprising:
reporting at least one candidate channel state index beam index to a network to avoid and/or mitigate a maximum permissible exposure event at a user equipment; and at the user equipment, associating at least one candidate antenna of the user equipment to the at least one candidate channel state index beam index.

15 . A method as claimed in claim 14 , further comprising reporting at least one candidate channel state index beam index to the network in a Power Headroom Report.

16 . A method as claimed in claim 14 , further comprising reporting, to the network, allowed reduction of maximum power level for the at least one candidate channel state index beam index.

17 . A method as claimed in

Assignees

• Nokia Technologies Oy

Inventors

• Rom Christian
• Caporal Del Barrio Samantha
• Svendsen Simon
• Vejlgaard Benny
• Knudsen Knud
• Karimidehkordi Ali

Classifications

• H04B7/0828 Primary

  with delay elements in antenna paths · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04W52/365 Primary

  Power headroom reporting · CPC title

• H04W52/42

  in systems with time, space, frequency or polarisation diversity · CPC title

• H04B7/0695

  using beam selection · CPC title