Provided are systems and methods for reliable, out-of-order transmission of packets. In some implementations, provided is an apparatus configured to communicate with a network and a host device. The apparatus may receive messages from the host device at a send queue, where each message includes destination information. The apparatus may further determine, using the destination information and an identify of the send queue, a transport context associated with a destination on the network. The apparatus may further, for each message and using the transport context, generate a packet including the message and transmit the packet over the network. The apparatus may further monitor status for each transmitted packet.

A method for data transfer includes transmitting a sequence of data packets from a first computer over a network to a second computer in a single RDMA data transfer transaction. Upon receipt of a second packet in the sequence without previously having received the first packet, the second computer sends a NAK packet over the network to the first computer, indicating that the first packet was not received. A retransmission mode is selected responsively to the type of the transaction, such that when the transaction is of a first type, the first packet is retransmitted from the first computer to the second computer in response to the NAK packet without retransmitting the second packet, and when the transaction is of a second type, both the first and second packets are retransmitted from the first computer to the second computer in response to the NAK packet.

Methods and apparatus to handle unordered signaling radio bearer (SRB) packets are disclosed. In some aspects, the apparatus may be a user equipment (UE) or a base station. The apparatus may receive a signaling radio bearer (SRB) packet, buffer it in a radio link control (RLC)-to-Packet Data Convergence Protocol (PDCP) reordering window, and selectively forward or discard the SRB packet based upon a reordering timer with a first expiration period that is greater than a second expiration period associated with a data radio bearer (DRB) reordering timer, to give the apparatus extra time to receive a missing SRB packet while maintaining a shorter latency for DRB packets. In some aspects, the apparatus may detect an out-of-order (OOO) SRB packet and request retransmission without waiting for a sending communications device to check on receive status.

Embodiments of the present invention provide a method and apparatus for enhanced data retransmission based on log-likelihood ratio (LLR) combining in WLAN. According to some embodiments, packets can be retransmitted using a modified transmission scheme. Codewords are associated with cyclic redundancy checks (CRCs) for detecting errors, and a subsequent packet is received that includes data that can be used to correct the error. For example, each packet can be encoded for both error detection and correction, and the retransmission mechanism can be adapted to the error rate. The retransmission scheme is improved by utilizing an LLR combining scheme, transmit diversity, and modified ACK methods.

Embodiments of the present invention provide a method and apparatus for enhanced data retransmission based on log-likelihood ratio (LLR) combining in WLAN. According to some embodiments, packets can be retransmitted using a modified transmission scheme. Codewords are associated with cyclic redundancy checks (CRCs) for detecting errors, and a subsequent packet is received that includes data that can be used to correct the error. For example, each packet can be encoded for both error detection and correction, and the retransmission mechanism can be adapted to the error rate. The retransmission scheme is improved by utilizing an LLR combining scheme, transmit diversity, and modified ACK methods.

Provided are systems and methods for reliable, out-of-order transmission of packets. In some implementations, provided is an apparatus configured to communicate with a network and a host device. The apparatus may receive out-of-order packets from a remote device. The apparatus may transmit selective-acknowledgements to the remote device such that remote device can retransmit certain packets. The out-of-order packets can be provided to software for re-ordering.

In an electronic monitoring system, a base station can identify missing video and/or audio (“media”) packets from a recording device by detecting gaps between sequence numbers corresponding to media packets received in an encoded media stream. The base station can efficiently avoid individually acknowledging every media packet received from the recording device. However, when missing media packets are identified, the base station can queue non-contiguous sequence numbers for the missing media packets for requesting re-transmission from the recording device in a single message. The base station can request such re-transmission during regular report intervals providing statistics and/or control information, and/or in between such intervals in application-specific messages, subject to a guard time. If the recording device still has at least one missing media packet in an egress queue, the recording device can accordingly re-transmit the missing media packet.

In the present invention, the transmitting device attaches a sequence number (SN) for each of service data unit (SDU) elements to generate a protocol data unit (PDU) containing the SDU elements. Each of the SDU elements is a SDU or SDU segment. The PDU includes the SDU elements and respective SNs for the SDU elements. The PDU includes an indicator for each of the SDU elements, and the indicator indicating whether a corresponding SDU element is a SDU or SDU segment.

A data processing method, a terminal device, and a base station are disclosed. The method includes: determining to change a type of at least one radio bearer of the terminal device from a first type to a second type; discarding a radio link control protocol RLC protocol data unit and/or an RLC service data unit buffered by a transmit side of an RLC layer entity of the at least one radio bearer; and assembling an RLC protocol data unit received by a receive side of the RLC layer entity of the at least one radio bearer into an RLC service data unit, and delivering the RLC service data unit in sequence to an upper layer entity of the RLC layer entity, where the upper layer entity is an upper layer entity of the RLC layer entity before the type of the at least one radio bearer is changed.

A wireless device may receive first configuration parameters for uplink LBT failure recovery. The wireless device may create a transport block, comprising an LBT failure MAC CE, scheduled for transmission via a first cell at a first timing. The wireless device may trigger consistent LBT failure for the first cell based on the first configuration parameters and before the first timing. In response to the triggering, the wireless device may drop or transmit the transport block based on one or more conditions.