US 11,743,946 B2
Dynamic estimation of random access response repetitions
Dino Pjanic, Malmö (SE); Sergio Almansa-Valverde, Lund (SE); Gabriel Cercel, Helsingborg (SE); Waqas Nawaz Khan, Lund (SE); André Nyberg, Staffanstorp (SE); and Fredrik Saarnak, Löddeköpinge (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 16/648,802
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Oct. 17, 2017, PCT No. PCT/EP2017/076488
§ 371(c)(1), (2) Date Mar. 19, 2020,
PCT Pub. No. WO2019/076443, PCT Pub. Date Apr. 25, 2019.
Prior Publication US 2020/0221502 A1, Jul. 9, 2020
Int. Cl. H04W 74/08 (2009.01); H04W 4/70 (2018.01); H04W 72/23 (2023.01)
CPC H04W 74/0833 (2013.01) [H04W 4/70 (2018.02); H04W 72/23 (2023.01)] 20 Claims
OG exemplary drawing
 
1. A method for dynamically configuring repeated transmission of random access response messages from an access node; wherein the random access response message is repeatedly transmitted in response to receipt of a random access request from a wireless device operating in a coverage enhancement (CE) mode; wherein the random access response message is configured for repeated transmission on a downlink channel using a repetition level selected from a set of repetition levels associated with a CE level of the CE mode; wherein the repetition level represents a predetermined number of repeated transmissions; wherein the CE level represents a group of wireless devices with similar radio conditions; the method comprising:
determining, for a predetermined data set, a ratio of successful to initiated random access attempts when applying a selected repetition level of the set of repetition levels for repeated transmission of the random access response messages on the downlink channel; wherein a random access attempt is counted as successful responsive to receipt of a first uplink transmission on a packet uplink shared channel (PUSCH); and
selecting an operational repetition level of the set of repetition levels for repeated transmission of random access response messages on the downlink channel based on the determined ratio.