US 12,464,562 B2
Communicating between nodes in the unlicensed spectrum
Nuno Manuel Kiilerich Pratas, Gistrup (DK); Erika Portela Lopes De Almeida, Aalborg (DK); Lars Christensen, Aalborg (DK); Jan Hviid, Klarup (DK); Stig Blücher Brink, Aalborg Øst (DK); and Karsten Petersen, Aalborg (DK)
Assigned to Nokia Technologies Oy, Espoo (FI)
Appl. No. 17/995,022
Filed by Nokia Technologies Oy, Espoo (FI)
PCT Filed Apr. 15, 2020, PCT No. PCT/EP2020/060503
§ 371(c)(1), (2) Date Sep. 29, 2022,
PCT Pub. No. WO2021/209121, PCT Pub. Date Oct. 21, 2021.
Prior Publication US 2023/0129493 A1, Apr. 27, 2023
Int. Cl. H04W 74/08 (2024.01); H04W 16/14 (2009.01); H04W 24/08 (2009.01); H04W 28/02 (2009.01); H04W 72/40 (2023.01); H04W 74/0808 (2024.01)
CPC H04W 74/0808 (2013.01) [H04W 16/14 (2013.01); H04W 24/08 (2013.01); H04W 28/0289 (2013.01); H04W 72/40 (2023.01)] 6 Claims
OG exemplary drawing
 
1. A method of feedback over sidelink, comprising:
receiving, by a second user equipment (UE) a signal over sidelink from a first UE, wherein the signal comprises a control portion and a data payload portion, wherein the control portion indicates a node to which data is to be transmitted and the data payload portion is sent in a physical sidelink shared channel (PSSCH);
measuring a receive signal strength indication (RSSI) across all supported channels or a sub-bands;
measuring a receive signal reference quality (RSRP) in the current sub-band;
computing the RSRQ in the current sub-band;
detecting a cause of failure of a transmission based on the RSRQ; and
creating part A comprising:
the RSSI's of the sub-bands or the channels that are available; and
the cause of the failure of the current sub-band;
decoding sidelink control information (SCIs) from the signal;
determining the SCI is directed to the second UE;
based on determining the SCI is directed to the second UE, initiating a decoding the data payload portion sent in the PSSCH;
creating part B comprising an indication as to whether the decoding of the data payload portions was successful;
generating, by the second UE, a response to the received signal, wherein the response comprises the part A and the part B, wherein part A further comprises information regarding: congestion status, and quality of the active sidelink in the current sub-band and congestion information about other sub-bands;
preparing a transmission, by the second UE, a portion of the response comprising the part A via a physical sidelink feedback channel (PSFCH);
attempting to capture a channel by performing a listen before talk (LBT) category 2 procedure, wherein the category 2 LBT is without random back off and has a listening period of 25 microseconds at 5 GHz and is used in multi-channel access;
based on the channel not being captured, performing a subsequent LBT category 2 procedure;
based on the subsequent LBT category 2 procedure being successful in capturing the channel, determining a time gap since the signal over the sidelink was received;
based on the time gap not elapsing, transmitting a first portion of the response comprising an initial fragment of the part A via PSFCH;
after the time gap has elapsed, transmitting a second portion of the response comprising the part B followed by a third portion of the response comprising a final fragment of the part A.