Signal transmission methods and apparatuses, a terminal device, a network device, and a storage medium are disclosed. By means of a target number of retransmissions, a signal to be transmitted is retransmitted multiple times, such that a terminal device with a reduced number of radio frequency channels can combine the gains of said signal by means of multiple retransmissions to obtain a signal to be transmitted with a greater gain, thereby expanding the coverage range of the terminal device.

Provided is a wireless communication terminal that communicates wirelessly. The terminal includes: a transceiver; and a processor. The terminal includes a transceiver, and a processor. The processor is configured to receive an Aggregate-MAC Protocol Data Unit (A-MPDU) from an originator using the transceiver, and when receiving all MPDUs included in the A-MPDU, transmit to the originator a block ACK (BA) frame signaling that all MPDUs included in the A-MPDU are received without a bitmap indicating whether each MPDU included in the A-MPDU is received.

Embodiments of this disclosure provide an efficient mechanism for re-ordering media access control (MAC) service data units (MSDU) segments by including link-specific MAC addresses and link-independent sequence control fields in MAC headers appended to MAC protocol data unit (MPDU) payloads within which the MSDU segments are encapsulated prior to transmitting the MPDU payloads over multiple aggregated 802.11 links. Each sequence control field may include a link-independent sequence number that indicates a relative position of a corresponding MSDU within the sequence of MSDUs of the same traffic stream. Additionally, when the MSDU segment is an MSDU fragment, the sequence control field may further include a link-independent fragment number that indicates a relative position of the corresponding MSDU fragment within a sequence of MSDU fragments of the MSDU that was subject to fragmentation.

A communications device is configured to receive a plurality of downlink control information DCI messages each of the DCI messages providing an indication of communications parameters for the communications device to receive a plurality of transport blocks in communications resources of the downlink according to a plurality of hybrid automatic repeat request-type, HARQ, processes. The communications device receives, after each received DCI message, one or more of the plurality of transport blocks from the communications resources of the downlink and determines whether data carried by the received one or more transport blocks has been decoded correctly. The communications device then transmits for each of the one or more received transport blocks a HARQ feedback message providing one of an acknowledgement, ACK, or a negative acknowledgement NACK, on an uplink of the wireless access interface according to a corresponding one of the HARQ processes.

A network device is configured to: obtain, from a first communication device, quality information about a quality of a radio link of the first communication device to one or more second communication devices; and provide to the one or more second communication devices and to the first communication device control information. The control information includes: membership information about a membership of the one or more second communication devices to one or more retransmission groups, and instructions on a group-specific retransmission of a data packet by members of a retransmission group.

Mechanisms may be used for aggregating acknowledgement (ACK), block ACK (BA) and/or short packets transmissions for multi-user (MU) wireless communication systems. Aggregation mechanisms may be used for uplink (UL) and/or downlink (DL) orthogonal frequency division multiple access (OFDMA), and/or UL/DL multiple-user multiple input multiple output (MU-MIMO) transmissions, for example. Multi-user short packets may be aggregated and/or simultaneously transmitted for DL, UL, or peer-to-peer (P2P) transmissions.

To appropriately perform communication even in a case where a transmission timing/transmission period for retransmission control information is flexibly controlled (is variable), an aspect of a user terminal according to the present invention includes a transmitting section that transmits retransmission control information for DL transmission and a control section that controls transmission of the retransmission control information at certain timings reported from a base station. A time window is configured for the retransmission control information, the control section controls transmission of the retransmission control information, based on the certain timings and the time window configured for the retransmission control information.

Seamless client roaming for Multi-Link Device (MLD) clients may be provided. First, a Traffic Identifier (TID)-to-link map may be established by an Upper Service Access Point (U-SAP) of a multi-AP MLD entity that assigns subsets of TIDs to at least two links of the entity. For example, a client device logically associates with the U-SAP, while the client device physically connects to a first and second AP of the entity on a respective first and second link, where the first and second AP include first and second Lower Service Access Points (L-SAPs) and are non-collocated. Next, using the map, data received at the U-SAP is directed over one of the two links for transmission to the client device. Further, frame aggregation and block acknowledgment functions may be performed by one of the first or second L-SAP based on whether data transmission is over the first or second link.

Apparatuses, methods, and systems for dynamically controlling a local buffer of a modem of a wireless device are disclosed. One method includes receiving and queuing transmission packets in the local buffer of the modem of the wireless device for wireless transmission to a receiving device, purging each transmission packet from the local buffer after receiving an acknowledgement of reception of the transmission packet from the receiving device, and requesting acknowledgement from the receiving device when a queue of the transmission packets within the local buffer exceeds a threshold level, wherein the receiving device aggregates acknowledgment responses to a plurality of unpurged transmission packets in the local buffer and transmits an aggregated acknowledgment to the modem.

A method of operating a receiver in a communications network includes receiving a protocol data unit, PDU, from a transmitter, wherein the PDU carries at least part of a service data unit, SDU, determining that first and second non-adjacent segments of the SDU were not successfully received at the receiver, and requesting retransmission by the transmitter of a portion of the SDU from a beginning of the first non-adjacent segment to an end of the second non-adjacent segment.