This patent document describes failure recovery technologies for the processing of streaming data, also referred to as pipelined data. The technologies described herein have particular applicability in distributed computing systems that are required to process streams of data and provide at-most-once and/or exactly-once service levels. In a preferred embodiment, a system comprises many nodes configured in a network topology, such as a hierarchical tree structure. Data is generated at leaf nodes. Intermediate nodes process the streaming data in a pipelined fashion, sending towards the root aggregated or otherwise combined data from the source data streams towards. To reduce overhead and provide locally handled failure recovery, system nodes transfer data using a protocol that controls which node owns the data for purposes of failure recovery as it moves through the network.

A method of transmitting an acknowledgement (ACK) signal in a wireless communication system is provided. The method includes: establishing a first wireless connection between a first and second electronic devices; establishing a second wireless connection between the first electronic device and a source device; transmitting, by the first electronic device, communication parameter information to the second electronic device; transmitting, by the first electronic device, a data request to the source device; receiving, by the first electronic device, a data packet from the source device in response to the data request; receiving, by the second electronic device, the data packet from the source device based on the communication parameter information; transmitting, by the first electronic device, a first ACK signal to the second electronic device; and transmitting, by the second electronic device, a second ACK signal to the source device based on the first ACK signal.

The present invention relates to a method for configuring a retransmission protocol on the uplink between a network node and a relay node in a mobile communication system, the configuration being performed at a network node or at a relay node, and to the corresponding relay node apparatus and network node apparatus capable of configuring the retransmission protocol. In particular, the number of transmission processes is determined based on the position of time intervals available for the transmission and may be selected in order to control the round trip time of the retransmission protocol. Once the number of transmission processes has been configured, the transmission processes are mapped on the available time intervals in a predefined order and repetitively.

Systems and methods for implementing semi-persistent scheduling (SPS) transmission of periodic messages via one or more sidelinks are described. SPS for a sidelink groupcast may be activated and/or deactivated using SPS control signaling for the sidelink groupcast. SPS control signaling utilized for activating/deactivating SPS for a sidelink groupcast may include a SPS indicator (e.g., conveyed at least in part via SCI format 0-1 message), an activation/deactivation indicator (e.g., conveyed at least in part via SCI format 0-1 message and/or SCI format 0-2 message), and/or a configuration index (e.g., conveyed at least in part via SCI format 0-1 message and/or SCI format 0-2 message). Other aspects and features are also claimed and described.

A relay device first receives a data packet from a network device through a first link, and sends the data packet to user equipment through a second link. A protocol stack of the relay device consists of a physical layer, a media access control layer, and a segmentation function or a resegmentation function of a radio link control layer; a protocol stack of the relay device consists of a physical layer, a media access control layer, a segmentation function or a resegmentation function of a radio link control layer, and an adaptation layer; or a protocol stack of the relay device consists of a physical layer and a hybrid automatic repeat request function of a media access control layer. The first link is a wireless communication link between the network device and the relay device, and the second link is a wireless direct communication link between the relay device and the user equipment.

The present disclosure relates to a method and apparatus for discontinuous reception (DRX) for a link between a network and a user equipment (UE) based on device-to-device (D2D) communication in a wireless communication system. A method for DRX of a first UE in a wireless communication system may include receiving, from a second UE, hybrid automatic repeat request (HARQ) feedback information related to sidelink data transmitted from the first UE; transmitting, by the first UE, HARQ NACK information to a base station in an uplink based on the HARQ feedback information from the second UE; sleeping during an operation of the first timer that starts after the first UE transmits the HARQ NACK information; and monitoring a downlink control channel that includes resource allocation information on a sidelink data retransmission during an operation of a second timer that starts after the first timer expires.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may select, from a first path and a second path, a path for an uplink communication associated with at least one of a variable payload size for hybrid automatic repeat request (HARQ) feedback or channel state information (CSI) feedback, wherein the first path is on an uplink of the UE and the second path is on a sidelink of the UE; and transmit the uplink communication on the selected path. Numerous other aspects are provided.

A wireless communication device that transmits data to another wireless communication device that performs wireless connection using a packet including a transmission number, the wireless communication device includes, a controller configured to classify the data as first data when a transmission condition indicating a condition related to transmission of the data is a first transmission condition and classifies the data as second data when the transmission condition of the data is a second transmission condition different from the first transmission condition, and a transmitter configured to transmit the data in a first transmission mode in a layer related to the wireless connection when the data is the first data and transmits the data in a second transmission mode in a layer related to the wireless connection when the second data is second data.

An exemplary communication method and system is disclosed. The system may be configured to create a mesh network of nodes for routing and/or rerouting data communications depending on the integrity of or demands on the system to improve efficiency and transmission confidence. The system may be configured to redundantly, simultaneously send data transmissions on different transmission interfaces using different transmission protocols.

In a packet loss indication method, a user plane function (UPF) entity receives first indication information from a first base station, where the first indication information indicates that a first data packet was unsuccessfully sent, and that the first data packet was unsuccessfully sent includes that the UPF entity unsuccessfully sent the first data packet to the first base station or the first base station unsuccessfully sent the first data packet to a first terminal device. Second indication information is sent to a second base station, where the second indication information indicates that the first data packet was unsuccessfully sent.