US 12,418,838 B2
CU-DU communication for multicast with support for switching between unicast and multicast
Philippe Godin, Versailles (FR); and David Navratil, Helsinki (FI)
Assigned to Nokia Technologies Oy, Espoo (FI)
Appl. No. 18/006,424
Filed by Nokia Technologies Oy, Espoo (FI)
PCT Filed Aug. 4, 2020, PCT No. PCT/EP2020/071892
§ 371(c)(1), (2) Date Jan. 23, 2023,
PCT Pub. No. WO2022/028677, PCT Pub. Date Feb. 10, 2022.
Prior Publication US 2023/0354106 A1, Nov. 2, 2023
Int. Cl. H04W 36/00 (2009.01); H04B 7/06 (2006.01); H04W 72/30 (2023.01); H04W 74/02 (2009.01); H04W 76/12 (2018.01); H04W 76/22 (2018.01); H04W 76/40 (2018.01)
CPC H04W 36/0007 (2018.08) [H04B 7/0626 (2013.01); H04W 36/0085 (2018.08); H04W 72/30 (2023.01); H04W 74/02 (2013.01); H04W 76/12 (2018.02); H04W 76/22 (2018.02); H04W 76/40 (2018.02)] 8 Claims
OG exemplary drawing
 
1. An access node, the 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, with the at least one processor, to cause the access node at least to perform:
sending, to a terminal device, information on a configuration of a first radio link control leg for a first radio bearer for point-to-point transmissions identified by a cell radio network temporary identifier and information on a configuration of a second radio link control leg for a second radio bearer for point-to-multipoint transmissions identified by a group radio network temporary identifier, wherein the first radio bearer is one of a unicast data radio bearer and a single cell multicast radio bearer, the second radio bearer is the single cell multicast radio bearer and the first and second radio link control legs have been configured so that the first radio link control leg is currently active and the second radio link control leg is inactive;
receiving channel state information and/or hybrid automatic repeat request feedback associated with the first radio link control leg being currently active from the terminal device;
determining, based at least on the channel state information and/or the hybrid automatic repeat request feedback, that improved efficiency for the terminal device according to pre-defined criteria is enabled if the second radio link control leg is set as active and the first radio link control leg is set as inactive; and
transmitting, to the terminal device, an activation command for activating monitoring and decoding of a physical downlink control channel using the group radio network temporary identifier associated with the second radio link control leg to subsequently receive, in the terminal device, multicast data using the second radio link control leg on a downlink shared channel.