Beam Squint Effects in 3GPP TSG-RAN-WG4 Meeting

 
WF on FR2 Beam Squint Effect
 
SONY, ….
 
3GPP TSG-RAN WG4 Meeting # 95-e 
        
draft
 R4-2008488
Electronic Meeting, 25 May – 5 Jun., 2020
 
Background
 
Beam squint happens when DL BM reference signals and
UL/DL control and/or data channels of interest are not
within the same CC, see figure on right
Beam squint causes a received signal to have a
frequency selective characteristic
It is a radiative-domain impairment
It causes gain droop, like impairment caused by
active circuitry in the conducted domain
Problem statement: Given CC1 and CC2 separated by ∆f
and assuming the UE uses the codebook entry optimized
for CC1, what is the degradation of CC2 spherical
coverage?
RAN4 has 
further discussed the impact due to beam
squint effect on the requirement of CBM inter-band  CA
and intra-band CA
 3GPP TSG-RAN WG4 Meeting # 95-e.
 
2
 
WF on CBM inter-band DL CA and Intra-band
DL CA
 
For EIS spherical coverage:
CBM inter-band DL CA: 
Including radiated relaxation 
due to the 
beam squint effect in the CBM
inter-band CA EIS 
spherical coverage 
as below:
For CBM inter-band CA EIS spherical coverage, allowing X dB relaxation (at spherical coverage point on CCDF)
on the secondary CC.
X depends on the frequency separation between primary and secondary CCs.
The relaxation due to beam squint shall be included in the general inter-band CA relaxation.
 
Intra-band DL CA: no impact to consider because spherical coverage requirement is absent.
 
The following information shall be captured in the TR for information, based on company
contributions
CA EIS degradation quantified in terms of delta gain CDF, due to frequency separation from the CC configured
as the beam management reference signal.
 
Companies are encouraged to provide input on the value of X based on the agreed simulation
assumption from 
R4-2005675 for the 
CBM inter-band CA spherical coverage requirement
discussion
 
For 
REFSENS 
:
The beam squint effect on the CBM inter-band REFSENS is FFS, 
companies are encouraged to
verify if best EIS value is impacted.
 
3
 
WF on Intra-band UL CA
 
The beam squint effect on the 
Intra-band UL CA 
is FFS, 
companies are
encouraged to verify if there is impact to FR2 CA EIRP (peak and
spherical coverage) for FS <= 1400 MHz
 
 
4
 
WF on Beam management reference signal
location for 
FR2 CA test
 
In FR2 CA cases, requirements apply when the BM RS is provided in a
CC with a configured UL BWP
BM RS shall be provided in Pcell for CBM inter-band CA and intra-
band CA. BM RS shall be provided in Pcell and one of Scell in IBM
inter-band CA .
 
5
 
Reference
 
R4-200XXXX Email discussion summary for [95e][123] NR_RF_FR2_req_enh_Part_3    Moderator (Qualcomm
Incorporated)
 
6
Slide Note
Embed
Share

Beam squint effects in 3GPP TSG-RAN-WG4 meeting are discussed, focusing on the degradation of spherical coverage due to frequency separation between primary and secondary component carriers. The impact on CBM inter-band DL/UL channel aggregation and intra-band CA is also explored, highlighting the need for relaxation considerations in EIS spherical coverage requirements. Companies are encouraged to provide input on simulation assumptions for better understanding and verification of beam squint effects on various aspects of FR2 CA testing.


Uploaded on Sep 17, 2024 | 1 Views


Download Presentation

Please find below an Image/Link to download the presentation.

The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.

E N D

Presentation Transcript


  1. 3GPP TSG-RAN WG4 Meeting # 95-e Electronic Meeting, 25 May 5 Jun., 2020 draft R4-2008488 WF on FR2 Beam Squint Effect SONY, .

  2. Background Conducted power in transmitted CCs Beam squint happens when DL BM reference signals and UL/DL control and/or data channels of interest are not within the same CC, see figure on right Beam squint causes a received signal to have a frequency selective characteristic It is a radiative-domain impairment It causes gain droop, like impairment caused by active circuitry in the conducted domain Problem statement: Given CC1 and CC2 separated by f and assuming the UE uses the codebook entry optimized for CC1, what is the degradation of CC2 spherical coverage? RAN4 has further discussed the impact due to beam squint effect on the requirement of CBM inter-band CA and intra-band CA 3GPP TSG-RAN WG4 Meeting # 95-e. Blue CC squints away from target direction due to separation in frequency from reference signal gNB Ref signal for BM Power received OTA x dB Difference in antenna gain, x dB UE 2

  3. WF on CBM inter-band DL CA and Intra-band DL CA For EIS spherical coverage: CBM inter-band DL CA: Including radiated relaxation due to the beam squint effect in the CBM inter-band CA EIS spherical coverage as below: For CBM inter-band CA EIS spherical coverage, allowing X dB relaxation (at spherical coverage point on CCDF) on the secondary CC. X depends on the frequency separation between primary and secondary CCs. The relaxation due to beam squint shall be included in the general inter-band CA relaxation. Intra-band DL CA: no impact to consider because spherical coverage requirement is absent. The following information shall be captured in the TR for information, based on company contributions CA EIS degradation quantified in terms of delta gain CDF, due to frequency separation from the CC configured as the beam management reference signal. Companies are encouraged to provide input on the value of X based on the agreed simulation assumption from R4-2005675 for the CBM inter-band CA spherical coverage requirement discussion For REFSENS : The beam squint effect on the CBM inter-band REFSENS is FFS, companies are encouraged to verify if best EIS value is impacted. 3

  4. WF on Intra-band UL CA The beam squint effect on the Intra-band UL CA is FFS, companies are encouraged to verify if there is impact to FR2 CA EIRP (peak and spherical coverage) for FS <= 1400 MHz 4

  5. WF on Beam management reference signal location for FR2 CA test In FR2 CA cases, requirements apply when the BM RS is provided in a CC with a configured UL BWP BM RS shall be provided in Pcell for CBM inter-band CA and intra- band CA. BM RS shall be provided in Pcell and one of Scell in IBM inter-band CA . 5

  6. Reference R4-200XXXX Email discussion summary for [95e][123] NR_RF_FR2_req_enh_Part_3 Moderator (Qualcomm Incorporated) 6

Related


More Related Content

giItT1WQy@!-/#giItT1WQy@!-/#giItT1WQy@!-/#giItT1WQy@!-/#