Operating in a radio link control acknowledged mode using a multicast or broadcast radio bearer

A method of wireless communication performed by a network entity, comprising:

• configuring a set of user equipments (UEs) for a multicast or broadcast traffic flow using a radio link control (RLC) acknowledged mode (AM);
• transmitting, to one or more UEs of the set of UEs, a configuration for the multicast or broadcast traffic flow in the RLC AM, the configuration including a packet data convergence protocol (PDCP) duplication configuration indicating whether PDCP duplication is enabled or disabled;
• transmitting, to the one or more UEs, an indication of an adjustment of an RLC AM transmission window of the network entity, the RLC AM transmission window being adjusted based at least in part on a threshold quantity of retransmissions of RLC packets associated with the multicast or broadcast traffic flow being satisfied, and the RLC packets being delivered to a PDCP layer using out-of-sequence delivery,
• out-of-sequence delivery being used to deliver the RLC packets to the PDCP layer in response to:
• the PDCP duplication configuration indicating that PDCP duplication is enabled, or
• the PDCP duplication configuration indicating that PDCP duplication is disabled and an RLC configuration indicating to use out-of-sequence delivery;
• transmitting, to the one or more UEs, a polling request associated with a threshold value indicated in the configuration;
• and
• receiving an RLC status report, indicating one or more negative acknowledgments (NACKs) for one or more RLC packets, based at least in part on a random number, generated at the one or more UEs, satisfying the threshold value.

A user equipment (UE) for wireless communication, comprising:

• a processing system that includes one or more processors and one or more memories coupled with the one or more memories, the processing system configured to cause the UE to:
• receive a configuration for a multicast or broadcast radio bearer (MRB) in a radio link control (RLC) acknowledged mode (AM), the configuration including a packet data convergence protocol (PDCP) duplication configuration indicating whether PDCP duplication is enabled or disabled;
• receive an indication of an adjustment of an RLC AM transmission window of a network entity, the RLC AM transmission window being adjusted based at least in part on a threshold quantity of retransmissions of RLC packets associated with the MRB being satisfied;
• synchronize an RLC AM reception window of the UE with the RLC AM transmission window using the adjustment of the RLC AM transmission window, the RLC AM reception window being associated with reassembly of the RLC packets;
• deliver the RLC packets to a PDCP layer using out-of-sequence delivery in response to:
• the PDCP duplication configuration indicating that PDCP duplication is enabled for the MRB, or
• the PDCP duplication configuration indicating that PDCP duplication is disabled for the MRB and an RLC configuration indicating to use out-of-sequence delivery;
• receive a polling request associated with a threshold value indicated in the configuration for the MRB;
• generate, based at least in part on the polling request, a random number;
• and
• transmit an RLC status report, indicating one or more negative acknowledgments (NACKs) for one or more RLC packets, based at least in part on the random number satisfying the threshold value.

A network entity for wireless communication, comprising:

• a processing system that includes one or more processors and one or more memories coupled with the one or more memories, the processing system configured to cause the network entity to:
• configure a set of user equipments (UEs) for a multicast or broadcast traffic flow using a radio link control (RLC) acknowledged mode (AM);
• transmit, to one or more UEs of the set of UEs, a configuration for the multicast or broadcast traffic flow in the RLC AM, the configuration including a packet data convergence protocol (PDCP) duplication configuration indicating whether PDCP duplication is enabled or disabled;
• transmit, to the one or more UEs, an indication of an adjustment of an RLC AM transmission window of the network entity, the RLC AM transmission window being adjusted based at least in part on a threshold quantity of retransmissions of RLC packets associated with the multicast or broadcast traffic flow being satisfied, and the RLC packets being delivered to a PDCP layer using out-of-sequence delivery,
• out-of-sequence delivery being used to deliver the RLC packets to the PDCP layer in response to:
• the PDCP duplication configuration indicating that PDCP duplication is enabled, or
• the PDCP duplication configuration indicating that PDCP duplication is disabled and an RLC configuration indicating to use out-of-sequence delivery;
• transmit, to the one or more UEs, a polling request associated with a threshold value indicated in the configuration;
• and
• receive an RLC status report, indicating one or more negative acknowledgments (NACKs) for one or more RLC packets, based at least in part on a random number, generated at the one or more UEs, satisfying the threshold value.